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VALIDATION NOTICE1 23 March 1990 ANSI/ASME B1.2-1983 16 May 1983

ANST/ASME Bl.2-1983, adopted on 25 October 1984, has been reviewed and determined to be current.

Custodians: Army - AR Navy AS Air Force -11

-

.r.

Review Activities: Army - AT, AV, GL, ME User Activity: Navy - EC

Civil Agency Coordinating Activities: Commerce - NIST DOT - ACO, APM, FAA, FRA, NHT GSA - FSS, PLD HUD - HSRS Justice - FPI NASA - JFK, LRC, MSF USDA - AFS Preparing Activity: DLA - IS

AREA THDS DISTRIBUTION STATEMENTA.

is unlimited. Approved for public release; distribution

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Errata to ANSI/ASME Bl.2-1983 The Errata correction listed belowapplies to ANSI/ASME B1.2-1983, Gages and Gaging for Unified Inch Screw Threads. Page

Location

Change

87

Table 11

Under column 8, change third entry .3739

from .3744 to

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MAY 1992

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THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS 345 East 47th Street, New York, N.Y. 10017

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N0058E

ASME B L - 2 8 3

2575532 0033b51

43

.-

AN AMERICAN NATIONAL STANDARD

Gages and Gaging for Unified Inch Screw Threads ANSI/ASME B1.2-1983 (REVISION OF ANSI B1.2-1974)

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S P O N S O R E DA N DP U B L I S H E DB Y

T H EA M E R I C A NS O C I E T Y United Engineering Center

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OF M E C H A N I C A LE N G I N E E R S 3 4 5 East 47th Street New York,

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N. Y. 1 001 7

b 3-

This Standard will berevisedwhen the Society approves the issuance of a new edition. There will be no addenda or written interpretations of the requirements of this Standard issued to this Edition.

Date of Issuance: June 15, 1984

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This code or standard was developed under procedures accredited as meeting the criteria for American National Standards. The Consensus Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had anopportunity to participate. The proposed code or standard was made available for public review and comment which provides an opportunity for additional public input from industry, academia, regulatory agencies, and in the public-at-large. ASMEdoes not "approve,""rate,"or"endorse"anyitem, construction, proprietary device, or activity. ASME does not take any position with respect t o the validity of any patent rights asserted in connection with any items mentioned in this document, and does not undertake to insure anyoneutilizing a standard against liability for infringement of any applicable Letters Patent, nor assume any such liability. Users of a code or standard are expressly advised that determination of thevalidity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility. Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard. ASME does not accept any responsibility for interpretations of this document made by individual volunteers.

No part of this document may be reproduced in any form, in an electronic retrievalsystem or otherwise, without the prior written permission of the publisher,

Copyright 0 1984 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Resewed Printed in U.S.A.

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ASME B I - 2 8 3

2 5 7 5 5 1 2 OOll1653 2

FOREWORD (This Foreword is not part of American National Standard ANSVASME 61.2-1983, Gages and Gaging for Unified Inch Screw Threads.)

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American National Standards Committee B1 for the Standardization of screw threads was organized in 1920 as Sectional Committee B1 under the aegis of the American Engineering Standards Committee (later the American National Standards Association, then the United States of America Standards Institute and,as of.October 6, 1969, the American National Standards Institute, Inc.), with the Society of Automotive Engineers and the American Society of Mechanical Engineers as.joint sponsors. In 1982, American National Standards Committee B1 was reorganized as the ASME Standards Committee BI, and since then it has operated under the American Society of Mechanical Engineers Procedures to produce and update standards which may become ANSI Standards after final approval by the American National Standards Institute. A declaration of accord with respect to the unification of screw threads was signed on November 18, 1948, by representatives of the services and industry of the United States, the United Kingdom, and Canada.The ANSI Unified Screw Thread Standard BI. 1, through the quadripartite standardizationagreement (QST AG) 247, Unified Threads, is subject to an international standardization agreement through the instrumentality of the AmericanBritish-Canadian-Australian Army Standardization Program, which recognizes BI. I as a standard forUnified Threads when it is required to effect the interchangeability of parts and equipment between the armies of the participating nations. The first American National Standard for Screw Thread Gages and Gaging was published as ASA B1.2-1941 to supplement the parent Standard ASA B1.l-1935, ScrewThreads for Bolts, Nuts, Machine Screws and Threaded Parts. That Standard was revised and republished as a Unified Standard ASA Bl.1-1949 and again as ASA Bl.1-1960. The Unified Gage Standard was republished as ASA B1.2-1951 and USA B1.2-1966. On February 9, 1973, a meeting was held by the Department of Commerce at the National Bureau of Standards, Washington, D.C., attended by representatives of government and industry screw thread interests. With the goal of eliminating parallel‘standards, those at the meeting recommended that theNBS Handbook H-28 be converted into a coordinating document for government screw thread standards wherein sections of H-28 would be replaced by single page references to existing industry standards. It was further recommended that the chairmanof American National Standards Committee B1 set up a group to clearly define and establish identified levels of acceptability for screw threads. At an American National Standards Committee B1 meeting held on May 3, 1973,unanimous approval was given to the following motion: “The BI Committee recognizing the needs of industry for different levels of acceptability for screw threads, establishes new scopes for StandardsB 1.1 and B 1.2 and sets up a new standard, B1.3.” References to conformance criteria were removed from ANSI B1.2-1974 and additional gages and gaging data were added to suit additional conformance requirements specified in ANSI B1.3 or other B1 thread documents. This new publication, designated ANSIIASME B1.2-1983, has had considerable new material added to cover the many options of gages and measuring equipment shown in ANSI B1.3, Screw Thread Gaging Systems for Dimensional Acceptability. It has also re-

...

111

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ASME B 3 - 2 83

2 5 7 5 5 3 2 O O L 3 6 5 q LI

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applied HI and LO to function as NOT GO gages and has eliminated gages with pitch diameter outside product thread limits. ANSI B1.2 was approved by the ASME Standards Committee B1 on March 18, 1983. The proposed standard was submitted by the ASME Board of Standardization to the American NationalStandardsInstitute. It was approved and formally designated an American National Standard on May 16, 1983.

iv

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ASMESTANDARDSCOMMITTEE BI Standardization and Unification of Screw Threads (The following is the roster of the Committee at the time of approval ofthis Standard.)

OFFICERS D. J. Emanuelli, Chairman H. W. Ellison, Vice Chairman C. E. Lynch, Secretary

COMMITTEE PERSONNEL AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC. G. G. Gerber, McDonnell Douglas, St. Louis, Missouri H. Borrman, Alternate, Sperry Gyroscope Division, Great Neck, New York AMERICAN IRON AND STEEL INSTITUTE F. Dallas, Jr., Sawhill Tubular Division, Sharon, Pennsylvania AMERICAN MEASURING TOOL MANUFACTURERS ASSOCIATION D. Dodge, Pennoyer-Dodge Company, Glendale, California C. W. Jatho, Alternate, American Measuring Tool Manufacturers Association, Birmingham, Michigan AMERICAN PIPE FllTlNGS ASSOCIATION W. C . Farrell, Stockham Valves and Fittings, Birmingham, Alabama DEFENSE INDUSTRIAL SUPPLY CENTER E. Schwartz, Defense Industrial Supply Center, Philadelphia, Pennsylvania F. S . Ciccarone, Alternate, Defense Industrial Supply Center, Philadelphia, Pennsylvania ENGINE MANUFACTURERS ASSOCIATION G.. A. Russ, Cummins Engine Company, Columbus, Indiana FARM AND INDUSTRIAL EQUIPMENT INSTITUTE J. F. Nagy, Ford.Motor Company, Dearborn, Michigan INDUSTRIAL FASTENERS INSTITUTE R. B. Belford, Industrial Fasteners Institute, Cleveland, Ohio R. M. Harris, Bethlehem Steel Company, Lebanon, Pennsylvania K. E. McCullough, SPS Technologies, Inc., Jenkintown, Pennsylvania J. C. McMurray, Russell, Burdsall and WardInc., Mentor, Ohio J. A. Trilling, Holo-Krome Company, West Hartford, Connecticut E. D. Spengler, Alternate, Bethlehem Steel Company, Lebanon, Pennsylvania MANUFACTURERS STANDARDIZATION SOCIETY OF THE VALVE AND FllTlNG INDUSTRY W. C. Farrell, Stockham Valves and Fitting, Birmingham, Alabama METAL CUTTING TOOL INSTITUTE (TAP AND DIE DIVISION) N. F. Nau, Union/Butterfield, Athol, Massachusetts A. D. Shepherd, Jr., Alternate, Union/Butterfield, Derby Line, Vermont NATIONAL AUTOMATIC SPRINKLER AND FIRE CONTROL ASSOCIATION, INC. W. Testa, Grinnell Fire Protection Systems Company, Inc., Providence, Rhode Island R . P. Fleming, Alternate, National Automatic Sprinkler and Fire Control Association,Inc., Patterson, New York

V

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ASME 8 3 . 2

83 M 2 5 9 5 5 3 2 001365b 8 M

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION J. L. Griffin, Wheatland Tube Company, Wheatland, Pennsylvania J. B. Levy, General Electric Company, Schenectady, New York F. F. Weingruber, Westinghouse Electric Corp., Pittsburgh, Pennsylvania W. R. Williford, Alternate, National Electrical Manufacturers Association, Washington, D.C.

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NATIONAL MACHINETOOL BUILDERS ASSOCIATION R. J. Sabatos, The Cleveland Twist Drill Company, Cleveland, Ohio D. R. Stoner, Jr., Teledyne Landis Machine, Wayneshoro, Pennsylvania NATIONAL SCREW MACHINE PRODUCTS ASSOCIATION T. S. Meyer, Fischer Special Manufacturing Company, Cold Spring, Kentucky H. A. Eichstaedt, Alternate, National Screw Machine Products Association, Brecksville, Ohio SOCIETY OF AUTOMOTIVE ENGINEERS H. W. Ellison, General Motors Technical Center, Warren. Michigan SOCIETY OF MANUFACTURING ENGINEERS D. Davidson, Morse/Hemco Corporation, Holland, Michigan TUBULAR RIVET AND MACHINE INSTITUTE R. M. Byrne, Industry Service Bureaus, Inc., White Plains, New York U.S. DEPARTMENT OF THE AIR FORCE R. P. Stewart, Wright-Patterson, Ohio U S . DEPARTMENT OF THE ARMY F. J. Clas, U S . Department of the Army, Watervliet, New York J. Crowley, US. Army Material Development and Readiness Command, Alexandria, Virginia F. L. Jones, Alternate, U.S. Army Missle Command, Redstone Arsenal, Alabama U S . DEPARTMENT OF DEFENSE E. Schwartz, Defense Industrial Supply Center, Philadelphia, Pennsylvania U. S. DEPARTMENT OF THE NAVY

C. T. Gustafson, Portsmouth Naval Shipyard, Portsmouth, New Hampshire INDIVIDUAL MEMBERS C. T. Appleton, Jefferson, Massachusetts J. Boehnlein, PMC Industries, Wickliffe, Ohio R . Browning, Southern Gage Company, Erin, Tennessee R. S. Chamerda, The Johnson Gage Company, Bloomfield, Connecticut J. F. Cramer, Des Moines, Washington E. W. Drescher, Lancaster, Pennsylvania D. J. Emanuelli, Greenfield Tap and Die, Greenfield, Massachusetts C . G. Erickson, Colt Industries - Sterling Die Operation, West Hartford, Connecticut S. I. Kanter, P.E., The Hanson-Whitney Company, Hartford, Connecticut R. W. Lamport, The Van Keuren Company, Watertown, Massachusetts A. R. Machell, Jr,, Xerox Corp., Rochester, New York A. E. Masterson, Watervliet, New York R. E. Mazzara, Geometric Tool, New Haven, Connecticut P. V. Pastore, Regal Beloit Corp., South Beloit, Illinois M. M. Schuster, Hi-Shear Corporation, Torrance, California A. G. Strang, Boyds, Maryland A. F. Thibodeau, Swanson Tool Manufacturing, lnc., West Hartford, Connecticut J. W. Turton, The Bendix Corp., Greenfield, Massachusetts

Subcommittee B I .2- Screw Thread Gages and Gaging R . Browning, Chairman, Southern Gage Company, Erin, Tennessee A. F. Thibodeau, Secretary, Swanson Tool Manufacturing, Inc., West Hartford, Connecticut P. F. Bitters, Greenfield Tap and Die, Greenfield, Massachusetts J. Boehnlein, PMC Industries, Wickliffe, Ohio

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1

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D. Cadieux, Greenfield Tap and Die, Greenfield, Massachusetts R. S. Chamerda, The Johnson Gage Company, Bloomfield, Connecticut M. Davidson, Morse/Hemco Corp.. Holland, Michigan D. Dodge, Pennoyer-Dodge Company, Glendale, California H. W. Ellison, General Motors Technical Center, Warren, Michigan J. J. Fiscella, Latham, New York G. Garcina, Indianapolis, Indiana C. T. Gustafson, Metrology Laboratories Division, Portsmouth, New Hampshire S. 1. Kanter, The Hanson-Whitney Company, Hartford, Connecticut R. W. Larnport, The Van Keuren Company, Watertown, Massachusetts A. E. Masterson, Watervliet, New York K. E. McCullough, SPS Technologies, Inc., Jenkintown, Pennsylvania J. C. McMurray, Russell, Burdsall and Ward, Inc., Mentor, Ohio J. Preziosi, Amerace-Esna Corp., Union, New Jersey M. M. Schuster, Hi-Shear Corp., Torrance, California E. Schwarfz, Defense Industrial Supply Center, Philadelphia, Pennsylvania A. G. Strang, Boyds, Maryland J. W. Turton, The Bendix Corp., Greenfield, Massachusetts A. Zaverucha, McMellon Brothers, Stratford, Connecticut

Task Group B I .I6 - Gages and Gaging for Metric M Screw Threads C. G . Erickson, Chairman, West Hartford, Connecticut R. Browning, Secretary, Southern Gage Company, Erin, Tennessee R. S. Charnerda, The. Johnson Gage Company, Bloomfield, Connecticut M. Davidson, H.E. Morse Company, Holland, Michigan D. Ernanuelli, Greenfield Tap and Die, Greenfield, Massachusetts S. 1. Kanter, The Hanson-Whitney Company, Hartford, Connecticut R. W. Lamport, The Van Keuren Company, Watertown, Massachusetts K. E. McCullough, SPS Technologies, Inc., Jenkintown, Pennsylvania J. C. McMurray, Russell, Burdsall, and Ward, Inc., Mentor, Ohio E. Schwartz, Defense Industrial Supply Center, Philadelphia, Pennsylvania A. G. Strang, Boyds, Maryland

Vii

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ASME B I - 2 83

m

2 5 7 5 5 3 2 0033658 3

m

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CONTENTS

Foreword ........................................................................ Standards Committee Roster ....................................................... 1

Introduction

1.1 1.2 1.3

................................................................

References ............................................................. Classification ........................................................... Federal Government Use .................................................

2

Basic Principles ............................................ ; ................. 2.1 Accuracy in Gaging ..................................................... 2.2 Limitations of Gaging ................................................... 2.3 Determining Size of Gages ............................................... 2.4 Standard Temperature ...................................................

3

General Practice ............................................................ 3.1 General Design ......................................................... 3.2 Types of Gages ......................................................... 3.3 Interpretation of Tolerances .............................................. 3.4 Direction of Tolerances on Gages .......................................... 3.5 Standard Thread Gage Tolerances ......................................... 3.6 Tolerance on Lead ...................................................... 3.7 Tolerances on Half-Angle ................................................ 3.8 Check of Effect of Lead andFlank Angle Variations onProduct Thread 3.9 Calibration Requirements and Standards ...................................

.......

4

Types of Gages for Product InternalThread .................................. 4.1 GO Working ThreadPlug Gages .......................................... 4.2 NOTGO (HI) ThreadPlug Gages 4.3 Thread Snap Gages - GO Segments or Rolls .............................. 4.4 Thread Snap Gages - NOT GO (HI) Segments or Rolls ..................... 4.5 Thread Snap Gages - Minimum Matehal: Pitch Diameter Cone and Vee .................................................................. 4.6 Thread Snap Gages - Minimum Material: Thread Groove Diameter Type ................................................................ 4.7 Thread-Setting Solid Ring Gages .......................................... 4.8 Plain Plug. Snap. and Indicating Gages to Check Minor Diameter of InternalThread ....................................................... 4.9 Snap and Indicating Gages to Check Major Diameter of Internal Thread ....... 4.10 Functional Indicating Thread Gages for Internal Thread 4.11 Minimum-Material Indicating Thread Gages for Internal Thread ............... 4.12 Indicating Runout Thread Gage for Internal Thread ......................... 4.13 Differential Gaging ......................................................

.........................................

......................

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... 111

V

1 1 1 1

1 1 1 10 10 10 10 10 10 10 11 11 11 11 11 11 11 13 14 20 20 23 24 24 28 28 33 33 37

...................................................... .................................................. ........................... ............................................... ............................................ ................................................... ................................

4.14 Pitch Micrometers 4.15 Thread-M.easuring Balls 4.16 OpticalComparatorand Toolmaker’s Microscope 4.17 Profile Tracing Instrument 4.18 Surface Roughness Equipment 4.19 Roundness Equipment 4.20 Miscellaneous Gages and Gaging Equipment 5

Types of Gages for Product External Thread

..................................

.......................................... ........................................ .............................. .................... ......................................

5.1 5.2 5.3 5.4 5.5 5.6 5.7

GO Working Thread Ring Gages NOT GO (LO) ThreadRing Gages Thread Snap Gages - GO Segments or Rolls Thread Snap Gages - NOTGO (LO) Segments or Rolls ThreadSnap Gages - Coneand Vee Thread Snap Gages - Minimum Material: Thread Groove Diameter Type ..... Plain Ring and Snap Gages to Check Major Diameter of Product External Threads 5.8 Snap Gages forMinor Diameter of ProductExternalThreads ................. 5.9 FunctionalIndicatingThread Gages for ExternalThread 5.10 Mimimum-MaterialIndicatingThread Gages for ExternalThread 5.11 IndicatingRunout Gage forExternalThreads 5.12 Differential Gaging ...................................................... 5.13 WToleranceThread-Setting Plug Gages 5.14 Plain Check Plug Gages for Thread Ring Gages ‘5.15 Indicating Plain Diameter Gages - Major Diameter of Product External Threads 5.16 Indicating Gages to Check MinorDiameter of ExternalThread 5.17 Thread Micrometers 5.18 Thread-Measuring Wires 5.19 Optical Comparatorand Toolmaker’s Microscope 5.20 Profile Tracing Instrument ............................................... 5.21 Electromechanical Lead Tester 5.22 Helical Path Attachment Used With GO Type Thread Indicating Gage 5.23 Helical Path Analyzer 5.24 Surface Roughness Equipment ............................................ 5.25 Roundness Equipment 5.26 Miscellaneous Gages andGagingEquipment

...................................................... ..................... ............. .............................. ................................... ............................. ...................................................... ............... .................................................... ................................................. ........................... ............................................ ......... ................................................... ...................................................

................................

Figures

......................................... ........................................ ...................

1Maximum-MaterialGOFunctional Limit 2PartialEndThreadsand Chip Grooves ........................................... 3 NOTGO(HI) FunctionalDiameter Limit 4ThreadSnap Gages - Maximum-Material GO Functional Limit Limit 5Thread Snap Gages - NOT GO(HI)FunctionalDiameter 6Thread Snap Gages - Minimum-Material PitchDiameter Limit - Coneand Vee ..... 7Thread Snap Gages - Minimum-Material Thread Groove Diameter Limit 8Thread Form of Solid Thread-Setting Ring Gages 9MinorDiameter Limit - Cylindrical Plug Gages 10 Indicating Plain Diameter Gages - Max.-Min. Minor Diameter Limit and Size 11 Snap and Indicating Diameter Gages - Max.-Min. Major Diameter Limit and Size ..............................................................

................... ........... ..................................

.................................. ...................................................................

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39 39 39 40 40 40 40 40 40 128 129 131 133 133 133 135 135 139 139 139 143 148 148 148 159 159 159 160 160 160 160 161 161 161

12 14 16 19 21 22 23 26 27 29 30

83 W 2595512 O O l l b b O T

......

Maximum-Material GO Functional Limit and Size 12 Indicating Thread Gages . Minimum-Material Pitch Diameter Limit and 13 Indicating Thread Gages . Size . Cone and Vee 14 Indicating Thread Gages . Minimum-Material Pitch Diameter Limit and Size-BallandRadius 15 Indicating Thread Gages - Diameter Runout - Minor to Pitch 16 Indicating Thread Gages - Differentlal Gaging ........:.......................... 17 Inside Micrometer, Caliper Type 18 Maximum..M aterial GO Functional Limit 19 NOT GO (LO) Functional Diameter Limit ....................................... 20 Thread Snap Gages - Maximum-Material GO Functional Limit ................... 21 Thread Snap Gages - NOT GO (LO) Functional Diameter Limit 22 Thread Snap Gages - Minimum-Material Pitch Diameter Limit - Cone and Vee 23 Thread Snap Gages - Minimum-Material Thread Groove Diameter Limit 24 Major Diameter Limit ......................................................... 25 Minor Diameter Limit Snap Type 26 Indicating Thread Gages - Maximum-Material GO Functional Diameter Limit and Size ................................................................... 27 Indicating Thread Gages - Minimum-Material Pitch Diameter Limit andsize-ConeandVee .................................................... 28 Indicating Thread Gages - Minimum-Material Thread Groove Diameter Limit and Size .............................................................. 29 Indicating Thread Gages - Diameter Runout - Major to Pitch ..................... 30 Indicating Thread Gages - Differential Gaging ................................... 31 Thread Form of Truncated Thread-Setting Plug Gages 32 Thread Form of Full-Form Thread-Setting Plug Gages 33 Indicating Plain Diameter Gage - Max.-Min. Major Diameter Limit and Size 34 Indicating Diameter Gages - Max.-Min. Minor Diameter Limit and Size 35 Indicating Gages - Helical Path Attachment Used With GO Type Indicating Gage ..............................................................

....................................................... ................................................. ..................... ................................................ ........................................

................... ..... ........... ................................................

............................. ............................ ........ ............

Tables 1 Screw Thread Gages and Measuring Equipment for External Product

Thread Characteristics ...................................................... 2 Screw Thread Gages and Measuring Equipment for Internal Product Thread Characteristics ...................................................... 3 Recommended Widths for Chip Grooves 4 Specifications and Format for Tables 10 and 11 - Limits of Sue of ThreadedandPlain Gages for Unified ExternalandInternalThreads 5 Specifications and Format for Tables 10 and 11 - Limits of Size of ThreadSetting Gages for Unified Thread Working Gages 6 X Gage Tolerances forThread Gages 7W Gage Tolerances forThread Gages 8 Gage Tolerances for Plain Cylindrical Gages 9ConstantsforComputingThread Gage Dimensions 10 Gages for Standard Thread Series. Classes 1A. 2A. 3A. 1B.2B. and 3B Unified Screw Threads - Limits of Size 11 Setting Gages for Standard Thread Series.Classes1A.2A.3A. 1B. 2B. and 3B UnifiedScrew Threads - Limits of Size 12 Calibration Requirements and Standards for X Tolerance Thread Gages. Indicating Gages. Plain Gages. and Measuring Equipment for External ProductThreads

........................................ ............. .............................. ............................................ ........................................... ..................................... ............................... ............................................. ...............................

............................................................

31 34 35 36 38 39 127 129 130 132 134 135 136 137 138 140 141 142 144 146 147 149 150 160

2 6 13 15 17 18 25 28 32 41 83

151

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ASME BL.2

xi

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A

13 Calibration Requirements and Standards for X Tolerance Thread Gages. Indicating Gages. Plain Gages. and Measuring Equipment for Internal ........................................................... Product Threads 14 Calibration Requirements for Thread-andPlain-Setting Gages

.....................

155 159

Appendices A Calibration and Inspection of Limit Gages. Snap Gages. Indicating Gages. and Measuring Instruments

................................................................

Al A2 A3 A4 A5 A6 A7

General Thread Plug Gage Calibration ............................................ Thread Ring Gage Inspection ............................................ Plain Plug Gage Calibration ............................................. Plain Ring Gage Calibration Plain Snap Gages Rolls With Zero Lead Thread Form Used on Snap and Indicating Gages ............................................................... A8 Inspecting PeripheralContacting Segments Used on External ProductThread A9 Inspection of ThreadContact Segments Used on InternalProductThread ............................................... A10 Check for Magnification Discrepancies Due to Indicating System Linkage Al 1 Calibration of Dialand Electronic Indicators .............................. A12 Assessment of Surface Quality ...........................................

163 163 164 167 168 168

......................................................

170 170 171

........................................

173

............................................. .......................................................

......................................................

B

Metrology of 60 deg. Screw Threads

B1

B2 B3 B4 B5 B6 B7 B8 B9 B10

Wire Method of Measurement of Pitch Diameter (Thread Groove Diameter) ..................................... i ...................... Size of Wires ........................................................... Methods of Measuring Wires Considering the Effect of Deformation .......... .................................... Methods of Measurement Using Wires Standard Specification for Wires and StandardPractice in Measurement of Wires of60 deg. Threads ............................................ General Formulafor Measurement of Pitch Diameter Simplified Formula for Pitch Diameter .................................... Setting Measuring Instruments With Variable Measuring Force ............... Thread Balls ........................................................... Internal Pitch Diameter Measurement

.......................

.....................................

168 168 170

173 173 173 176 176 177 177 178 178 179

Figure

Tables Al Minimum Magnification

.............................................

174

.......................................................

164 165

.................................................

A2 60 deg. Included Thread Angle A3 Lengths of AGD Taperlock and Trilock Thread Plug Gage Blanks Selected FromANSI B47.1 .................................................. A4 Lengths of AGD Thread Ring Gage Blanks and Total Thread Lengths of Standard Truncated-Setting Plug Gage Blanks Selected from ANSI B47.1 B1 Thread-Measuring Wires for 60 deg. Screw Threads B2 Measuring Force for Over-Wire Measurements of External Pitch Diameter and Wire Calibration. and Cylindrical Diameter for Wire Calibration .................... B3 Measuring Force Over Balls for Internal Pitch Diameter Measurementand Ball Calibration

..................................................................... .............................. ........................................... xii

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166 169 175 176 179

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B1 A Three-Wire Method of Measuring Pitch (Thread Groove) Diameter of ThreadPlug Gages

ANSI/ASME 61.2-1983 ANAMERICANNATIONAL STANDARD

AN AMERICAN NATIONALSTANDARD

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

for Federal Services, Section 6, the use of this Standard by the federal government will be subject to all requirements and limitations of FED-STD-H28/6.

1 INTRODUCTION

This Standard provides essential specifications and dimensions for the gages used on Unified inch screw threads (UN and UNR thread form), and covers the specifications and dimensions for the thread gages and measuring equipment listed in Tables 1 and2. The basic purpose and use of each gage are also described.

2 BASIC PRINCIPLES 2.1 Accuracy in Gaging

1 ,I References

Thread plug gages are controlled by direct measuring methods. Thread ring gages, thread snap limit gages, and indicating thread gages are controlled by reference to the appropriate setting gages or direct measuring methods or both.

The latest editions of the following documents form a part of this Standard, tothe extentspecified herein.

American National Standards Unified Inch Screw Threads (UN ANSI B1.l and UNR Thread Form ANSI B1.3 Screw Thread Gaging Systems for Dimensional Acceptability ANSI B1.7 Nomenclature, Definitions, and Letter Symbols for Screw Threads Surface Texture: Surface RoughANSI B46.1 ness, Waviness, and Lay Gage Blanks ANSI B47.1 Measurement of Qualified Plain ANSI B89.1.6 Internal Diameters for Use as Master Rings and Ring Gages ANSI B89.1.9 Precision Inch Gage Blocks for Length Measurement (Through 20 in.) Measurement of Out-of-RoundANSI B89.3.1 ness

2.2 Limitations of Gaging 2.2.1 Product threads accepted by a gage of one type may be verified by other types. It is possible, however, that parts which are near a limit may be accepted by one type and rejected by another. Also, it is possible for two individual limit gages of the same type to be at opposite extremes of the gage tolerances permitted, and borderline product threads accepted by one gage could be rejected by another. For these reasons, a product screw thread is considered acceptable when it passes a test by any of the permissible gages in ANSI B1.3 for the gaging system specified, provided the gages being used are within the tolerances specified in this Standard. 2.2.2 Gaging large product external and internal threads equal to or greater than 6.25 in. nominal size with plain and threaded plug and ring gages presents problems for technical and economic reasons. In these instances, verification-may be based on use of modified snap or indicating gages or measurement of thread elements. Various types of gages or measuring devices in addition to those defined in this document are available and acceptable when properly correlated to this Standard. Producer and user should agree on the method and equipment used.

1.2 Classification In this Standard, the term NOT GO, previously known as HI and LO, is used to identify functional diameter thread gages. 1.3 Federal Government Use When this Standard is approved by the Department of Defense and federal agencies and is incorporated into FED-STD-H28/6,Screw Thread Standard I

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ASME B 1 . 2

83 M 2 5 7 5 5 1 2 0 0 1 1 b b 3 5 H

ANSVASME 61.2-1983 AN AMERICAN NATIONAL STANDARD

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

TABLE 1 SCREW THREAD GAGES AND MEASURING EQUIPMENT FOR EXTERNAL PRODUCT THREAD CHARACTERISTICS

T

Unified Inch Threads Maximum Material CO

-

I

Func. Limit

Thread Gages and Measuring Equipment

I

NOT GO Functional

Func. Size

Diam.

-uric.

Limit

1 Split or Solid Threaded Rings (ANSI 847.1) 1.1 G O

e

1.2 NOT GO (LO) 2

Thread SnapGages 2.1 G O segments 2.2 NOT G O (LO) segments 2.3 G O rolls

e

2.4 NOT G O (LO) rolls 2.5 Minimum material - pitch diameter type-cone andvee 2.6 Minimum material -thread groove diameter type - cone only 3

Plain Diameter Gages 3.1 Plain cylindrical ring for major diameter

3.2 Major diameter snap type 3.3 Minor diameter snap type

3.5 Maximum and minimum minor diametersnap type 4

Indicating Thread Gages Having either two contacts at 180 deg. or three contacts at 120 deg. 4.1 G O segments

e

e

e

4.3 G O rolls

e

e

e

4.5 Minimum material-pitchdiametertype-coneandvee

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3.4 Maximum and minimum major diametersnap type

4.6 Minimum material - thread groove diameter type - cone only 4.7 Major diameter and pitch diameter runout gage

2

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-

I

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' ASME 8 1 . 2 83 W 2 5 7 5 5 1 2 0011664 7

GAGES AND GAGING FOR UNIFIED INCH SCREWTHREADS

.

-

=

ANSVASME 61.2-1 983 AN AMERICAN NATIONAL STANDARD

Surface Texture

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N

3

-

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-7

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2575532 001Lbb5 9

ASME 81.2 8 3

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

ANSIIASME B1.2-1983 AN AMERICAN NATIONALSTANDARD

TABLE 1 SCREW THREAD GAGES AND MEASURING EQUIPMENT FOR EXTERNAL PRODUCT THREAD CHARACTERISTICS (CONT'D)

T

Unified Inch Threads Maximum Material GO Func. limit

Thread Gages and Measuring Equipment

Func. Size

NOT GO Functional Diameter

T

-

Func. limit

Func Size

Minimum Material

Pitch Diam.

T

Thd. Groove Diam.

limit

C1

-

4.8 Differential segment or roll

( G O profile for one pitch in length) used in combination with a G O indicating gage to yield a diameter equivalent for variation in lead (including uniformity of helix); and a minimum material indicating gage to yield a diameter equivalent for variationin flank angle

5Indicating Plain DiameterGages 5.1 Major diameter type 5.2 Minor diameter type ~

6

~~~~~

Pitch Micrometer With Standard Contacts [Approximately NOT G O (LO) Profile] C o n e a n d Vee

7 Pitch Micrometer With Modified Contacts [Approximately Pitch Diameter Contact] Cone and Vee

e

8 Thread-Measuring Wires With Suitable Measuring Means 9

Optical Comparator and Toolmaker's Microscope With Suitable Fixturing

e

1 0 Profile Tracing Equipment With Suitable Fixturing

e

A

11 Lead MeasuringMachineWithSuitableFixturing

12 Helical Path Attachment Used With GOType Indicating Gage

i

13HelicalPathAnalyzer 14 Plain Micrometer and Calipers

- Modified

As Required

15SurfaceMeasuringEquipment Equipment 16 Roundness

I

I

4L

NOTE:

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(1) Maximum minor diameter limit is acceptable when product passes GO gage on U N a n d UNR threads.

4

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ASME B L - 2 8 3

2 5 7 5 5 3 2 OOLlbbb 0

m

ANSVASME B1.2-1983 AN AMERICANNATIONALSTANDARD

GAGES AND GAGING FOR UNIFIEDINCHSCREWTHREADS

TABLE 1 SCREW THREAD GAGES AND MEASURING EQUIPMENT FOR EXTERNAL PRODUCT THREAD CHARACTERISTICS (CONT'D) Roundness of Pitch Cylinder Taper of Pitch Cylinder Size

Major Diameter

lead Incl. Helix Variation

Flank Angle Variation

Minor Diameter

Limit

Size

limit

I1

I2

K1

e

0

e

0

e

0

Size

"

"

"

"

"

e "

e "

"

"

"

"

"

"

-_ "

/

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3

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, .

- ~.~ . ~

_

_

_

_

_

Root Rad.

Diam. Runout Major to Pitch

Surface Texture

L

M

N

-

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-

ANSVASME 61.2-1983 AN AMERICAN NATIONAL STANDARD

TABLE 2

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

SCREW THREAD GAGES AND MEASURING EQUIPMENT FOR INTERNAL PRODUCT THREAD CHARACTERISTICS Unified Inch Threads

Material

NOT GO

T

Functional Diameter

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Thread Gages and Measuring Equipment 1 Threaded Plugs (ANSI 847.1) 1.1 G O

1.2 NOT GO (HI) 2 Thread SnapGages 2.1 GO segments 2.2 NOT G O (HI) segments 2.3 G O rolls 2.4 NOT GO (HI) rolls 2.5 Minimum material - pitch diameter type and vee

- cone

2.6 Minimum material - thread groove diameter type - cone only 3

Plain Diameter Gages 3.1 Plain cylindrical plugs for minor diameter 3.2 Major diameter snap type 3.3 Minor diameter snap type 3.4 Maximum and minimum major diameter snap type 3.5 Maximum and minimum minor diameter snap type

4

indicating Thread Gages Having either two contacts at 180 deg or three contacts at 120 deg. 4.1 G O segments 4.3 GO rolls

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Minimum Material

Pitch Diam.

Thd. Groove Diam.

limit

Size

limit

Size

C1

C2

D1

D2

ASME B3.283

W 2575532ÖOLlbb8

4 W ANSVASME 61.2-1983 ANAMERICANNATIONALSTANDARD

GAGESANDGAGING FOR UNIFIEDINCHSCREWTHREADS

TABLE 2 SCREW THREAD GAGES A N D MEASU-RING EQUIPMENT FOR INTERNAL PRODUCT THREAD CHARACTERISTICS (CONT'D)

Major Diameter

f [Note 1)

-":Note I )

Note 1)

~

iNote I

"I-(Note 1

I

7

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Size Limit

ANSI/ASME 61.2-1 983 AN AMERICAN NATIONAL STANDARD

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

TABLE 2 SCREW THREAD GAGES AND MEASURING EQUIPMENT FOR INTERNAL PRODUCT THREAD CHARACTERISTICS (CONT'D) Unified Inch Threads

-

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Maximum Material GO

Thread Gages and Measuring Equipment

Func. Func. limit

Size

Al

A2

4.5 Minimum material - pitch diameter type - cone and vee 4.6 Minimum material -thread groove diameter type - cone only

+

I

4.7 Minor diameter and pitch diameter runout gage 4.8 Differential segment or roll (GO profile for one pitch in length) used in combination with a GO indicating gage to yield a diameter equivalent for variation i n lead (including uniformity ofhelix), and a minimum material indicating gage to yield a diameter equivalent for variation in flank angle

5

Minimum Material

NOT G O Functional Diameter

Indicating Plain Diameter Gages 5.1 Major diameter type 5.2 Minor diameter type I

6

Pitch Micrometer With Standard Contacts [Approximately NOT G O (HI) Profile] Cone and Vee

7

Pitch Micrometer With Modified Contacts (Approximately Pitch Diameter Contact) Cone and Vee

8 Thread-Measuring 9

. I .

Balls With Suitable Measuring Means

Optical Comparator and Toolmaker's Microscope With Suitable Fixturing andCast Replica

10 Profile Tracing Equipment With Suitable Fixturing

14Surface

15

MeasuringEquipment

Roundness Equipment

NOTE: (1) Minimum major diameter limit is acceptable when product passes GO gage.

8

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ASME 8 3 . 2 83

m

2 5 7 5 5 3 2 0033b70 2

m ANSVASME 61.2-1 983 AN AMERICAN NATIONAL STANDARD

GAGES AND GAGING FOR UNIFIED INCH SCREWTHREADS

TABLE 2 SCREW THREAD GAGES AND MEASURING EQUIPMENT FOR INTERNAL PRODUCT THREAD CHARACTERISTICS (CONT'D) Roundness of Pitch Cylinder Taper Multilobe 120 deg.

limit

of Pitch Cylinder

lead Incl. Helix Variation

H

Root Rad.

Diam. Runout Minor to Pifch

Surface Texture

L

M

N

0

0

0

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Oval 180 deg.

2 5 7 5 5 3 2 0033673 '4

ASME B3.2 8 3

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

ANSVASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

(C) 68°F +1"F (20°C +0.5"C) for sizes above 3 in. to 6 in.

2 . 2 . 3 Indicating gages for internal threads smaller than 3/ 16 in. are not available.

3 GENERAL PRACTICE

2 . 3 Determining Size of Gages

3.1 General Design

2.3.1 Measuring Pitch Diameter. The three-

The design of gages is specified only to the extent that it affects the results obtained in the gaging of product threads, Moreover, to serve their intended purposes satisfactorily, thread gages should be produced by thelatestand best manufacturing techniques. The type of steel or wear-resistant material selected, together with the heat-treating and stabilization processes, should provide wear life and dimensional stability. Thread gaging elements should be precisely manufactured to assure adequate refinement of surface texture, prevention or elimination of amorphous or smear metal, and uniformity of thread form over the entire length of the gaging member.

wire method of determining pitch diameter size of thread plug gages is standard for gages in this Standard. Refer to Appendix B. 2 . 3 . 2 Size limit adjustments of thread ring and external thread snapgages are determined by their fit on their respective calibrated setting plugs. Indicating gages andthread gages forproductexternal threadsare controlled by reference to appropriate calibrated setting plugs. 2.3.3 Size limit adjustments of internal thread snap gages are determined by their fit on their respective calibrated setting rings. Indicating gages and otheradjustablethread gages for productinternal threads are controlled by reference to appropriatecalibrated setting rings or by direct measuring methods.

3 . 2 Types of Gages

For GO thread gages, check either the maximummaterial limit or size to assure interchangeable assembly. For NOT GO (HI and LO) thread gages, inspect the NOT GO functional diameter limit. For GO and NOT GO plain cylindrical plug or ring gages and snap or indicating gages, check the limit or size of the minor diameter of product internal threads and the major diameter of product external threads, respectively.

2.4 Standard Temperature 2.4.1 A temperature of 68°F (20°C) is the standard temperature used internationally for linear measurements. Nominal dimensions of gages and product as specified and actual dimensions as measured shall be within specified limits at this temperature. For screw thread gaging, the acceptable tolerance on the standard temperature is 3~2°F (k1 "C).

3.3 Interpretation of Tolerances

Tolerances on lead, half-angle, and pitch diameter are variations which may be taken independently for each of these elements and may be taken to the extent allowed by respective tabulated dimensional limits. The tabulated tolerance on any oneelement must not be exceeded, even though variations in the other two elements are smaller thanthe respective tabulated tolerances.

2 . 4 . 2 As product threads are frequently checked

at temperatures which are not controlled, it is desirable that the coefficient of the thermal expansion of gages be the same as that of the product on which they are used. Inasmuch as the majority of threaded product consists of iron or steel, and screw thread gages are ordinarily made of hardened steel, this condition is usually fulfilled without special attention, provided thread gages andproduct have stabilized to the same temperature. When the materials of the product thread and thegage are dissimilar, the differing thermal coefficients can cause serious complications and must be taken into account,unless both product and gage at the time of gaging are at a temperature of: (a) 68°F k4"F (20°C +2"C) for 1 in. and smaller (6) 68°F k2"F (20°C +l°C) for sizes above 1 in. to 3 in.

3.4 Direction of Tolerances on Gages

At the maximum-material limit (GO), the dimensions of all gages used for final conformance gaging are tobe within the limits of size of the product thread. At the functional diameter limit, using NOT GO (HI and LO) thread gages, the standard practice is to have the gage tolerance within the limits ofsize of the product thread, Specifications for gage limits are listed in Tables 4 and 5. 10

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ASME B 3 - 2 83

m

2 5 7 5 5 3 2 0031672 b

ANSVÄSME B1.2-1983 ANAMERICANNATIONALSTANDARD

GAGES'AND GAGING FOR UNIFIEDINCHSCREWTHREADS

of the thread within proper limits. The equivalent of the variationfromthe true thread form caused by such irregularities as convex, concave or wavy flanks, rounded crests, or slight projections on the thread formshallnot exceed the tolerance permitted on half-angle.

3.5 Standard Thread Gage To-lerances

Standard tolerances for thread-working gages, thread-setting plugs, and setting rings are as follows: (a) W tolerance, shown in Table 7, represent the highest commercial grade of accuracy and workmanship and are specified for thread-setting gages; (b) X tolerances, shown in Table 6, are larger than W tolerances andare used forproduct inspection gages. Unless otherwise specified, all threadgages and gaging contacts which directly check the product threadshall be X tolerance.

3.8 Check of Effect of Lead and Flank Angle Variations on Product Thread

When this check is specified, there are two general methods available forthe inspection procedures involved. (a) Direct Measurement of Lead and Half-Angle of Flanks. The lead and flank angles of theproduct thread may be measured by means of available measuring equipment, such as thread indicating gages, projection comparators, measuring microscopes, graduatedcone points, lead measuring machines, helix variation measuring machines, threadflank charting equipment, etc. Diameter equivalents of such variations from nominal maybe calculated: each 0.0001 in. variation in lead amounts to 0.00017in. (1.732 X .OOOOl) increase in functional pitch diameter on external threads or a decrease in functional pitch diameter on internalthreads for 60 deg. screw threads. The tangent of half-angle variation times 1 . 5 equals ~ the approximatemaximum change in functional pitch diameter, based on a height of thread engagement of 0.6258 and equal half-angle variations. (b) Differential Gaging Utilizing Indicating Thread Gages. See Sections 4 and 5 for explanation and illustration of differential gaging for internal and external threads.

3.6 Tolerance on Lead Cumulative effect of progressive or erratic helix variation and thick or 'thin end thread Variations is specified as an allowable variation between any two threads not farther apart than the length of the standard taperlock or trilock gage, shown in ANSIB47.1. In the case of setting plugs, the specified tolerance shall be applicable to the thread length in the mating ring gage or nine pitches, whichever is smaller. For setting rings, the tolerance applies to a thread length of three pitches. The tolerance on lead establishes the width of a zone, measured parallel to the axis of the thread, within which the actual helical path must lie for the specified length of the thread. Measurements will be taken from a fixed reference point located at the start of the firstfull thread to a sufficient number of positions along the entire helix to detect all types of lead variations. The amounts that these positions vary from their basic (theoretical) positions will be recorded with due respect to sign. The greatest variation in each direction [plus and minus (*)I will be selected andthe sum of their values, disregarding sign, shall not exceed the specified tolerance. If the variations are all in one direction, the maximum value governs conformance. In the case of truncated setting plugs, the lead variations present on the fullform portionand the truncated portion of an individual gage shall notdiffer from each other by more than 0.0001 in. over any portion equivalent to the length of the thread ring gage, or nine pitches, whichever is less. (When linear lead and drunkenness are measured as individual elements and the sum of these does not exceed the tolerance specified, the gage is wellwithin tolerance.)

3.9 Calibration Requirements and Standards

Calibration requirements and standards for X tolerance thread gages, snap gages, and indicating gages; Z tolerance plain gages and measuring instruments are given in Table 12 for external product threads, in Table13 for internal product threads, and in Table 14 for setting gages. See Appendix A for methods of calibrating and inspecting gages.

4 TYPES OFGAGES FOR PRODUCT INTERNAL THREAD

3.7 Tolerances on Half-Angle

4.1 GO Working Thread Plug Gages (Table 2 - Gage 1 .I )

Tolerances are specified for the half-angles rather than the included angle to assure that the bisector of the included angle will be perpendicular to the axis

4.1 .I PurposeandUse. The GO thread plug gage inspects the maximum-material GO functional limit, A l , of product internal thread. The GO thread 11

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ASME B3.2 8 3

m

2575532 0033b73 8

m GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

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ANSL'ASME BI .2-1983 AN AMERICAN NATIONAL STANDARD

FIG. 1 MAXIMUM-MATERIAL GO FUNCTIONAL LIMIT

4.1.5 Thread Crests. The major diameter of the GO thread plug gage shall be the same as the minimum major diameter of the product internal thread with a plus gage tolerance. The thread crests shall be flat in an axial section and parallel to the axis.

gage represents the maximum-material GO functional limit of the product internal thread, and its purpose is to assure interchangeable assembly of maximummaterial mating parts. GO thread pluggages must enter and pass through the full-threaded length of the product freely. The GO thread plug gage isa cumulativecheck of all thread elements except the minor diameter.

4.1.6 Thread Roots. The minor diameter of the GO thread plug gage shall be cleared beyond a p / 8 width of flat either by an extension of the sides of the thread toward a sharp vee or by an undercut no greater than P/8 maximum width and approximately central.

4 . 1 . 2 Basic Design. The maximum-material limit on GO thread plusgagesis made to the prescribed maximum-material limit of the product internal thread, and the gaging length is equal to the length of the gaging plug.

4 . 1 . 7 Runout of Pitch and Major Cylinders.

On thread plug gages an eccentric condition produces an oversize effective major diameter having a width of flat less thanp/8, which may encroach on the minimum permissibIelimit fortheroot profile of the product internal thread. The permissible maximum effective major diameter, as determined by adding measurement of runout (full-indicator movement) with respect to the pitch cylinder to the measured

4.1.3 Gage Blanks. For practical and economical reasons, the design and lengths of the gaging plug members have been standardized for various size ranges and pitches (see ANSI B47.1 or Table A3). 4 . 1 . 4 Thread Form. The specifications for thread form are summarized in Table 4 and Fig. 1. 12

,

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i

fl

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-ASME B I - 2 83

2 5 7 5 5 1 2 0011b74 T

~~

=

ANSI/ASME B1 2 - 1 983 ANAMERICANNATIONALSTANDARD

GAGES AND GAGING FOR UNIFIEDINCHSCREWTHREADS

major diameter, shall not exceed the maximum major diameter specified.

TABLE 3 RECOMMENDED WIDTHS FOR CHIP GROOVES

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Chip Groove Width, in.

4.1.8 Pitch Cylinder. The pitch cylinder shall be round and straight limits specified.

within the gage pitch diameter Nominal Diameter, in.

Half-Angle Variations. Lead and half-angle variations shall be within the limits specified. See Table 6.

No. 8 (0.164) and smaller

4.1.9Leadand

0.026

4.1.IO incomplete Thread. The feather -edge 0.042 0.052 at both ends of the threaded section of the gaging member shall be removed. On pitches coarser than 28 threadslin., not more than one complete turn of the end threads shall be removed to obtain a full-thread form blunt start.See Fig. 2. On pitches 28 threadslin. and finer, a 60 deg. chamfer from the axis of the gage is acceptable in lieu of the blunt start.

Min.

No chip groove required

Above No. 8 (0.164) to and including 0.036No. 12 (0.216) Above No. 12 (0.216) to and including 3/8 (0.375) Above 3/8 (0.375) to and including 1/2 (0.500) Above 1/2(0.500) to and including 1 (1.000) Above 1 (1.000) to and including1-3/4 (1.750) Above 1-3/4 (1.750)

4.1.I 1 Chip Grooves. Each GO thread plug gage, except in sizes No. 8 (0.164in.) and smaller, shall be provided with a chip groove at the entering end. On reversible gages, a chip groove shall be provided at each end. Chip grooves that are in accordance with commercial practice are acceptable, such as a groove cut at anangle with the axis or a longitudinal groove cut parallel with the axis and extending the complete length of the gaging member. The groove shall be located circumferentially at the startof the full thread, and in all cases the depth shallextend below the root of the first full thread. The distance from the major diameter of the thread plug to the crest of the convolution rise in front of the chip groove, due to the radius of the convoluting tool, shall be a minimum of H / 2 as shown in Fig. 2. The beginning of the first thread shall be full form. The recommended widths for chip grooves are as shown in Table 3.

0.067 0.057

0.083

0.067

0.130 0.067 0.193 0.067

NOT GO (HI) functional diameter limit of the product internal thread. Thread plug gages when applied to the product internal thread may engage onlythe end threads (which may not be representative of the complete thread). Entering threads on product are incomplete and permit gage to start. Starting threads on NOT GO (HI) plugs are subject to greater wear than the remaining threads. Such wear in combination with the incomplete productthreads permits furtherentry of the gage. NOT GO (HI) functional diameter isacceptable when the NOTGO (HI) thread plug gageapplied to the product internal thread does not enter more than three complete turns. The gage should not be forced, Special requirements such as exceptionally thin or ductile material, small number of threads, etc., may necessitate modification of this practice.

4.2.2Basic Design. To better check the maximum functional diameter limit, the flank contact is reduced by truncating the major diameter, and the length of the gaging element, where practica1,'is less than that of the GO gage.

4.1.12 Identification. The GO thread plugs should be identified by the nominal size, threadslin., thread series, GO, PD, and pitch diameter. k.

EXAMPLE: 1/4-20 (or .250-20) UNC GO PD.2175

4.2.3' Gage Bianks. For practical and ecqnomic reasons, the designs and lengths of the gaging elements have been standardized for various size ranges and pitches (see ANSI B47.1 or Table A3).

4.2 NOT GO (Hi) Thread Plug Gages (Table 2 - Gage 1.2)

4.2.4Thread Form. The specificationsfor thread form are summarized in Table 4 and Fig. 3.

TheNOT GO (HI) thread plug gage inspects the NOT GO (HI) functional diameter limit, B I , of product internal thread. The NOT GO (HI) thread plug gage represents the

4.2.1 PurposeandUse.

4.2.5Thread Crests. The maximum major diameter of the NOT GO (HI) thread plug gage shall 13

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Max.

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GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

ANSVASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

'.

,

Grinding wheel or convoluting tool

Remove incomplete thread for one complete turn at both ends.

FIG. 2 PARTIAL E N D THREADS AND CHtP GROOVES

4.2.9 Lead and Half-Angle Variations. Lead and half-angle variations shall be within the limits specified. See Table 6 .

be equal to the maximum pitch diameter of the product internal thread plus 0.5H with the gage tolerance minus. This corresponds to a width of flat at the crest of the gage equal to 0.25~. See Table 4.

4.2.10 Incomplete Thread. The feather edge at both ends of the threaded section of the gaging member shall be removed. On pitches coarser than 28 threadslin., not more than one complete turn of the end threads shall be removed to obtain a full-thread blunt start. See Fig. 2. On pitches 28 threadslin. and finer, a 60 deg. chamfer from the axis of the gage is acceptable in lieu of the blunt start.

4 . 2 . 6 Thread Roots. The minor diameter of the NOT GO (HI) thread plug gage shall be cleared beyond a p / 8 width of -flat by an extension toward a sharp vee of the sides of the thread from theposition corresponding to this approximate width; or by an undercut to any dimension no wider than the width resulting from p / 8 maximum width, either side of and approximately central with the center line of the thread groove.

4.2.1 1 Identification. The NOTGO(H1)thread plug gage should be marked with the nominal size, threadslin., thread series, class, NOT GO, PD, and pitch diameter.

4.2.7 Runout of Pitch and Major Cylinders. The permissible maximum effective diameter, as determined by adding measurements of runout (fullindicator movement) with respect to the pitch cylinder to the measured major diameter, shall not exceed the maximum major diameter specified,

EXAMPLE: 1/4-20 (or .250-20) UNC-2B NOT GO PD.2224

4.3 Thread Snap Gages - GO Segments or Rolls (Table 2 - Gages 2.1 and 2.3)

4 . 2 . 8 Pitch Cylinder. The pitch cylinder shall be round and straight within the gage pitch diameter limits specified. --`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

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4.3.1 Purpose and Use. Thethreadsnap gage with two GO threaded segments or two GO zero lead 14

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2 5 7 5 5 3 2 00LLb7b 3

ASME B I - 2 83

ANSI/ASME BI .2-1983 AN AMERICANNATIONALSTANDARD

GAGESANDGAGINGFOR UNIFIEDINCHSCREWTHREADS

TABLE 4 SPECIFICATIONS AND FORMAT FOR TABLES 10 A N D 11 - LIMITS OF SIZE O F THREADED AND PLAIN GAGES FOR UNIFIED EXTERNAL A N D INTERNAL THREADS ~~

Nominal Size and Threadslin.

1

(To be specified)

Series Designation and Tolerance Class

2

Of external thread to be checked

Pitch diameter

I

CO

l 4

Max. pitch diameter of external thread; minus H/2; gage tolerance minus

Pitch

Min. pitch diameter of external thread; gage tolerance plus

Minor diameter

Min. pitchdiameter of external thread minus 0.25H; gage tolerance plus

NOTGO (LO)

Plain gages for major diameter

; Max. major diameter of external thread; gage tolerance minus

Min. major diameter of external thread; gage tolerance plus

NOT GO

Iq 9

Pitch diameter

10

Min. pitch diameter of internal thread; gage tolerance plus

Major diameter

11

Max. pitch diameter of internal thread plus H/2; gage tolerance minus

Pitch diameter

12

Max. pitch diameter of internal thread; gage tolerance minus

GO

Thread gages Gages for Internal Threads

NOT GO (HI)

Plain gages for minor diameter

Min. major diameter of internal thread; gage tolerance plus

Major diameter

Min. minor diameter of internal thread; gage tolerance plus

NOT GO

Max. minor diameter of internal thread; gage toLerance minus

15

Series Designation and Tolerance Class

Of internal thread to be checked

The GO thread snap gage can also indicate out-ofroundness of pitch cylinder for 180 deg. ovality by using the gage at different internal diametral locations on the product thread.

rolls inspects the maximum-material GO functional limit, A l , of product internal thread, The setting of the GO segments or rolls represents the maximummaterial GO functional limit of the product internal thread, and its purpose is to assure interchangeable assembly of maximum-material mating parts.The segments or rolls theoretically engage over the fullthreaded length of the product. The segments or rolls have a cumulative check of all thread elements except the minor diameter. Internal thread snap gages by design must have an outside diameter of gaging elements below minor diameter of internal thread in order to enter. Thegage checks all thread elements by sensing the resistance of contact after being set to a master.

4.3.2 Basic Design. The GO segments and rolls assembled into gage frames are the design of the individual gage manufacturer. The lengths of the two threaded segments and the two thread rolls spaced 180 deg. apart are equivalent to the standard gage blank lengths for practical and economic reasons. See. Table A3 and Fig. 4. Internal product threads less than 3/16 in, in diameter are not practical to check with snap gages. GO thread segments shall engage 25% or more of the product circumference. Product shall 'be 15

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--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

Gages for External Threads

Max. pitch diameter of external thread; gage tolerance minus

I

Minor diameter Thread gages

l 3

ANSIIASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

HI4 (RE

f

4.3.6 Runout. The pitch and major cylinders of thethreadedportion of the GO segments or rolls shall not exceed the runout as determined by measurements of runout (full-indicator movement) on each gaging member, with respect to the pitch cylinder. Runoutshall not exceed one-half the X gage major diameter tolerance.

checked around circumference of thread at sufficient axial positions to check the full-thread length. Thread rolls shall be applied at several locations (three if possible) axially over the full-thread length o f product. The circumference shall be checked at each position. 4 . 3 . 3 Thread Form. The specifications for thread form are summarized in Table 4 and Fig. 4.

4,3.7 Pitch Cylinder. The pitch cylinder of the threaded portion of the GO segments or rolls shall be straight and round within the X gage pitch diameter limits specified.

4 . 3 . 4 Thread Crests. The outside diameter of the threaded portion of the GO segments or rolls has the equivalent of a P/8flat on the thread with a plus gage tolerance. The threadcrest shall be flat in an axial section and parallel to theaxis of the gaging member.

4.3.8 Lead, Pitch, and Half-Angle Variations. Lead, pitch, and half-angle variations shall be within the limits specified. See Table 6.

4.3.5 Thread Roots. The minor diameter of the threaded portion of the GO segments or rolls shall be cleared beyond a P/8 flat either by an extension of the flanks of the thread toward a sharp vee or by an undercut no greater than PI8 maximum width and approximately central.

4 . 3 . 9 Identification. The assembled gage should be marked by the nominal size, threadslin., thread series, GO, PD, and pitch diameter. EXAMPLE: 1/4-20 (or ,250-20) UNC GO PD.2175

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--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

FIG. 3 NOT GO (HI) FUNCTIONAL DIAMETER LIMIT

ASME B I - 2 83 U 2 5 9 5 5 1 2 0011678 7

ANSI/ASME 61.2-1983 AN AMERICAN NATIONAL STANDARD

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

TABLE 5

SPECIFICATIONS AND FORMAT FORTABLES 10 A N D 11 - LIMITS OF SIZE O F THREADSETTING GAGES FOR UNIFIED THREAD WORKINGGAGES

Nominal Size and Threaddin. Series Designation and ToleranceClass

Plug for GO

1

(To be specified)

2

Of external thread to be checked by gage set with plug

3

Max. majordiam. of external thread (equals min. major diam. of full portion of GOsetting plug) 0.017~);gage tolerance minus (0.060 minus

-

Major diameter

I

G+

Truncated'

Full-form

4

5

Pitch diameter

Truncated* (Note 1)

Full-Form and Truncated Setting

6

Plugs

Plug for NOT GO (LO)

Major diameter

7

Full-form

Pitch diameter

8

Ring for GO Solid Thread-SettingRings for Snap and Indicating Gages

(HI)

Max. pitch diameter of external thread; gage tolerance minus

Min. pitch diameter of external thread plus H/2; gage tolerance minus Max. major diameterof external thread provided major diametercrest width shall not beless than 0.001 in. (0.0009 in. truncation). Apply W tolerance plus for max. size except that for 0.001 in. crestwidth apply toleranceminus. For the 0.001 in. crest width, major diameter is equal t o maximum major diameterof external thread plus 0.216506~ minus sum the of external thread pitch diameter tolerance and 0.0017 in. Min. pitch diameter of external thread; gage tolerance plus

Pitch diameter (Note 2)

9

Min. pitch diameter of internal thread; W gage tolerance plus

Minor diameter

10

Min. minor diameter of internal thread; W gage tolerance minus

Ring for NOT GO

Max. major diameter of externalthread; gage tolerance plus

Pitch diameter (Note 2)

11

M a x . pitch diameter of internal thread; W gage tolerance minus

Minor diameter

12

Max. minor diameter of internal thread; W gage tolerance minus

Series Designation and ToleranceClass

13

Of internal thread to be checked by gage set with ring

* Indicated rows applyto truncated sefting plugs only. NOTES: (1) Truncated portion i s required when optionalsharp root profilein Figs. 18,19,20,21, and 26 is used. (2) Tolerances greater than W tolerance for pitch diameter are acceptable when infernal indicating o r snap gage can accomodate a greater tolerance and whenagreed upon bysupplier and user.

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

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ASME 8 3 . 2

m

83

7

2 5 7 5 5 3 20 0 1 3 6 7 7

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

ANSVASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

TABLE 6 X GAGE TOLERANCES FOR THREAD GAGES Tolerance on Major or Minor Diameters (Note 4)

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

Threads/in.

1

Tolerance on Lead, in. (Notes 1, 3)

Tolerance on Half-Angle of Thread, deg. k min.

To and Including 4 in. Diam.

3

4

2

80 72 64 56 48

0.0002 .0002 .0002 .0002 .0002

0 0 0 0

0.0003 .0003

0

30 30 30 30 30

44 40 36 32 28

.0002 ,0002 .0002 .0003 .0003

0 0 0 0 0

20 20 20 15 15

.WO4 .0004 .0004 .OM5 .0005

27

.0003 .0003 ,0003 .0003 .0003

0

24 20 18 16

15 15 75 10 10

14 13 12 11% 11

.0003 .0003 .0003 .0003 .0003

0 0 0 0 0

10 10 10

.0006 .0006 .Ow6

IO

.OW6

10

.0006

10 9 8 7

.0003 .0003 .0004

0 0

.0004

0 0

10 10 5 5

6 5

.0004 .0004 .0004 .0004

0 0 0 0

5 5 5 5

4% 4

0 0 0 0

-

.0004 .0004

Including 1% in. Diam.

Above I/? in. to 4 in Diam.

5

6

7

... ...

0.0002 ,0002

...

.MO2 .0002 .0002

... ... ...

To and

0.0007 .0007

.0002 .0002 .0002 .0003 ,0003

.0007 ,0007 .0007 ,0007 .0009

.0003 .0003 .0003 .0003 .0003

.0009 .0009 .0009 ,0009 .0009

,0003 .0003 .0003 ,0003 .0003

,0006 .0007

.0009

.0007 ,0007

.0011

.0003 ,0003 .0004 .0004

.0008 .OW8 .0008 ,0009

.0013 .0013 ,0013 ,0015

,0004

...

.0005 .OM5

.OW5 .0005 '

Above 4 in. Diam.

...

.0004

Tolerance on Pitch Diameter (Notes 2,4)

.0006

,0011 ,0011

... *

.

a

...

.*. e

.

.

...

0.0003 .0003 .0003 .0003 .0003 .0004

Above in. to 8 ir Diam.

Above 8 in. to 12 in. Diam. (Note 2)

8

9

...

...

~-

... ... . ... ... ...

... ...

..> I

.

.

*.. 5.1

... .

e

a

*

. .

.0004

0.0005 .0005

0.0006 .0006

.0004 .0004 .0004 .0004 ,0004

.0005 .0005 .0005 ,0005 .0006

.0006 .0006 .0006 .0006 ,0008

.0004

.0006 ,0006 ,0006 ,0006 .0006

,0008 .0008 ,0008 .0w8 .0008

.W04 .0004 .0005 ,0005

.0006 .0006

.0008

.0006 .W06

,0008 ,0008 .0008

.0005 .0005 .Oll05 ,0005

.0006 .0006 ,0006 .0006

.0008 .0008 ,0008 .0008

.0004

.0004 .0004 .WO4

NOTES: (1) Allowable variation in lead between any two threads shallnot be farther apart thanthe length of the standard gage that is shown in ANSI 647.1. (2) Above 12 in., the tolerance is directly proportional to the tolerance in col. 9, in the ratio of the diameter to 12 in. (3) See 5.13.9. (4) Tolerances apply to designated size of thread. Apply tolerances in accordance with Table 4.

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ANSVASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

Q Q 8

i.

I

0 W

19 --`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

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2595512 OOllb8L 7

ASME 81.2 8 3

ANSI/ASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

4 . 4 Thread Snap Gages - NOT GO (HI) Segments or Rolls (Table 2 Gages 2 . 2 and 2.4)

be approximately central with the center line of the thread groove. See Fig. 5.

4.4.1 PurposeandUse. The thread snap gage with two NOT GO (HI) segments or two NOT GO (HI) rolls inspects the NOT GO (HI) functional diameter limit, B I ,of product internal thread. Thesetting of the NOT GO(BI) segments or rolls represents the maximum functiond diameter limit of the product internal thread. In applying the thread snaplimit gage, the NOT GO (HI) functional diameter is acceptable when gaging elements do not pass the product thread. Internalthreadsnap gages by design must have an outside diameter of gaging elements below minor diameter of internalthread in orderto enter.The gage checks the NOT GO functional diameter limit by sensing the resistance to contact after being set to master. The NOT GO (HI)thread snap gage will also indicate out-of-roundness of the pitch cylinder for 180 deg. ovality by using the gage at different diametral locations on internal thread. TheNOTGO(H1) thread snap gage will also check for taper of pitch cylinder by using the gage at different locationsaxially on internal thread.

4.4.6 Runout. The pitch and major cylinders of the threaded portion of the NOT GO (HI) segments or rolls shall not exceed the runout as determined by measurements of runout (full-indicator reading) on each gaging member, with respect to the pitch cylinder. Runout shallnot exceed one-half the X gage major diameter tolerance.

.

I

4.4.2 Basic Design. In order that the NOT GO (HI) thread snap gage may effectively check the NOT GO (HI) functional diameter limit, the flank contact is reduced by truncating the thread on segments and rolls. As the design of the segments and rolls are different with each gage manufacturer, the number of threads engaged in product thread will vary, Usually, the number of pitches engaged is approximately two. Internal product threads less than 3/ 16 in. in diameter are not practical to check with snap gages.

4.4.7 Pitch Cylinder. The pitch cylinder of the threaded portion of the NOT GO (HI) segments or rolls shall be round within the X gage pitch diameter limits specified. 4.4.8 Lead, Pitch, and Half-Angle Variations. Lead, pitch, and half-angle variations shall be within the limits specified. See Table 6 .

4.4.9 Identification. The assembled gage-should be marked by the nominal size, threadslin., thread

series, 'lass,

PD, and pitch diameter*

EXAMPLE: 1/4-20 (or ,250-20) UNC-2B NOT GO PD.2224

4.5 Thread Snap Gages - Minimum Material: Pitch Diameter Cone and Vee (Table 2 - Gage 2.5)

4.4.4 Thread Crests. The maximum major diameter of the NOT GO (HI) segments and rolls shall be equal to thepitch diameter of segment or rollplus 0.5Hwith thegage tolerance minus. This corresponds to awidth of flat at the crest equal to 0.25~.See Table 4.

4.5.1 PurposeandUse. The thread snap gage with two segments or two rolls, both made to cone and vee design as shown in Fig. 6, inspects the minimum-material limit pitch diameter, CI, of the product internal thread. 'Internal thread snap gages by design must have an outsidediameter of gaging elements below minor diameter of internal threadin order to enter. The gage checks the minimum-material pitch diameter limit by sensing the resistance of contact after being set to master. The cone and vee snap gage cancheck roundness of pitch cylinder for 180 deg. ovality by using the gage at different diametral locations on internal thread. The cone and vee snap gage can check taper of pitch cylinder by using the gage at different locations axially on internal thread.

4.4.5 Thread Roots. The minor diameter of the NOT GO (HI)segments and rolls shall be cleared beyond a P / 8 width of flat by an extension toward a sharp vee of the sides of the thread or by an undercut to any dimension no wider than P/4. Undercut is to

4.5.2 Basic Design. The segments are usually made having a surface contact slightly above pitch the line near the center of the flank. The rolls are made pitch with a pointor line contact approximately at the line, dependingupon the angle variations of the.

4.4.3 Thread Form. Thespecifications for thread form are summarized in Table 4 and Fig. 5.

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--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

W

ASME 8 1 - 2 83 M 2 5 7 5 5 3 2 0 0 1 1 b 8 2 7

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

ANSI/ASME 81.2-1983 AN AMERICAN NATIONAL STANDARD

a

Lu

6 E

0 8 I-

O

2

I

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I

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--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

a

Pitch cylinder

o.,p

GENERAL NOTE: Contacts in other positions near the pitch cylinder are also used.

Alternate Designs

Gaging elements contact above

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--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

FIG. 6 THREAD SNAP GAGES - MINIMUM-MATERIAL PITCH DIAMETER LIMIT- CONE AND VEE

I

Gaging elements contact central

ASME B 1 . 2

83

m

2 5 9 5 5 1 2 OOlLb8ll 2

ANSI/ASME B1 -2-1983 AN AMERICANNATIONALSTANDARD

GAGES AND GAGING FOR UNIFIEDINCHSCREWTHREADS

roll

1

.-U

Gaging contacts with radius one-half "best size" thread

L 4-

diam.

wire

FIG. 7 THREAD SNAP GAGES - MINIMUM-MATERIAL THREAD GROOVE DIAMETER LIMIT

checks the minimum-material pitch diameter limit by sensing the resistance of contact after being set to master. The roll thread snap gage will check roundness of the pitch cylinder for 180 deg. ovality by using the gage at different diametral locations. Also, the roll thread snap gage will check taper of the pitch cylinder by using the gage a t different locations axially.

thread flanks. See Fig. 6 for details. Internal product threads less than 3/ 16 in. in diameter are notpractical to check with snap gages. 4.5.3 Thread Form. The specifications for thread form, thread crests, and thread roots are summarized in Fig. 6. 4.5.4 Identification. The assembled gageshould be marked by the nominal size, threadslin., thread series, class, PD, and pitch diameter.

4.6.2 Basic Design. The "best size" thread wire radius contacts on the rolls check the threads at the pitch cylinder. Ribs on roll contacts are made one pitch apart. Internal product threads less than 3/ 16 in. in diameter are not practical to check with snap gages.

EXAMPLE 1/4-20 (or .250-20) UNC-2B PD.2224

4.6 Thread Snap Gages - Minimum Material: Thread Groove Diameter Type (Table 2 - Gage 2.6)

4.6.3 Thread Form. The specifications for the form on gage rolls are summarized in Fig. 7.

4.6.1 PurposeandUse. The thread snap gage with two rolls with "best size" thread wire radius contacts inspects the minimum-material limit pitch diameter, Dl,of the product internal thread. Internal thread snap gages by design must have an outside diameter of gaging elements below minor diameter of internal thread in order to enter. The gage

4.6.4 Identification. The assembled gage with rolls should be marked with thenominal size, threads/in., thread series, class, PD, and pitch diameter. EXAMPLE: 1/4-20 (or ,250-20) UNC-2B PD.2224

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--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

rib roll-

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

ANSI/ASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

4.7.7 Pitch Cylinder. Conformance of these elements is normally determined by the manufacturing of the setting ring gages to the applicable setting plug gage.

4 . 7 Thread-Setting Solid Ring Gages 4.7.1 Purpose and Use. Thread-setting ring gages are used for setting internal thread indicating and snap gages. GO thread-setting ring gages are made to the maximum-material limit of the internal thread specification and NOT GO (HI) thread-setting rings to the minimum-material limit. Setting rings under 3 / 16 in. diameter are too small to be practical.

4.7.8 Pitch Diameter Limitationof Taper. The taper shall be within gage pitch diameter limits.

4.7.9 Lead and Half-Angle. Lead and half-angle variations shall be within limits specifiedin Table 7.

4.7.2 Gage Blanks. GO and NOTGO (HI) solid thread ring gage blanks have been standardized for various size ranges and pitches. (See ANSI B47.1.) Length of gage thread is a minimum of four pitches.

4.7.10 Incomplete Threads. The feather edge at both ends of the thread ring gage shall beremoved. On gages larger than 1/ 2 in. nominal size, or having pitches coarser than 20 threadslin., not more than one complete turn of the end threads shallbe removed to obtain a full-thread blunt start. On gages 1/2 in. nominal size and smaller, or having pitches of 20 threadslin. or finer, a 60 deg. chamfer from the axis of the gage is acceptable in lieu of the blunt start.

4 . 7 . 3 The GO and NOT GO (HI) thread-setting gage threads are stated in detail below and are summarized in Tables 5, 7, and 11, and Fig. 8.

4.7.4 Thread Crests 4.7.4.1 The minor diameter of the GO setting ring gage is equal to the minimum minor diameter of the internal thread.

4.7.11 Identification. TheGO andNOTGO (HI) thread-setting ring gages should be identified by nominal size, threadslin., thread series, GO or NOT GO, class on NOT GO; SETTING, PD, and pitch diameter.

4.7.4.2 The minor diameter of the NOT GO (HI) setting ring gage is equal to the maximum minor diameter of the internal thread.

EXAMPLE: 1/4-20 (or ,250-20) UNC GO SETTING PD.2175

4.7.5 Thread Roots 4.7.5.1 The major diameter of the GO setting ring gage shall be cleared beyond P/8 width of flat by either an extension of the flanks toward a sharp vee or by a clearance cut of substantially P/8 width and approximately central.

1/4-20 (or .250-20) UNC-2B NOT GO SE'lTING PD.2224

4.8 Plain Plug, Snap, and Indicating Gages to Check Minor Diameter of Internal Thread

4.7.5.2 The major diameter of the NOT GO (HI) setting ring gage shall be cleared by a clearance cut of substantially 0 . 2 5 ~width and approximately central. The form is optional; it may clear a P/8flat if not undercut.

4.8.1 Purpose and Use. The GO and NOT GO (HI) thread gages of all designs are cleared at the root but do not check the minor diameter of the product internalthread. Accordingly, the following paragraphs (4.8.1 through 4.8.6) describe types of plain diameter gage or precision instruments used to check the maximum- and minimum-material limits of the minor diameter.

4.7.6 Runout of Pitchand Minor Diameter Cylinders for Sizes 3/16 in. andLarger. The pitch and minor cylinders of setting ring gages shall not exceed the runout as stated hereinafter. The permissible minimum effective minor diameter as determined by runout (full-indicator movement) with respect to the pitch cylinder subtracted from measured minor diameter shall not beless than the specified minimum minor diameter minus the sum of the W gage tolerances for pitch and minor diameter for GO setting gages, and minus twice the sum for NOT GO (HI) setting gages.

4.8.2 GO and NOT GO Plain Cylindrical Plug Gages (Table 2 - Gage 3.1). Plug gages shall be made to Z tolerances and as shown in Fig. 9. GO shall be made to plus tolerance; NOT GO shall be made to minus tolerance. GO cylindrical plug gage must enter and pass through the length of the product without force. NOT GO cylindrical plug must not enter. See Table 8 for gage tolerances. 24

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

.

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f

-I

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

] /

h,

.....

...

... 4 4

4

0

5

0 0 0

0

... ...

... ...

I

.0008 .0008 .0008 .0009

,0013 .0013 .0013 .0015

.0009 .0011 .0011 .0011

... ... ... ...

... ... ... ...

... ...

...

.0002

.0002 .0002 .0002 .0002

.0002 .0002 .0002 .0002 .0002

.00015 .00015 .00015 .00015 .0002

.00015 .00015 .00015 .00015 .00015

0.00015 .00015 .00015 .00015 .00015

9

Above %in.to 1% in. Diam.

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

.00025 .00025 .00025 .00025

.00025 .00025 .00025 .00025

.00025 ,00025 .00025 .00025 .00025

,0002 .0002 .0002 .00025

.0002

.0002 .0002 .0002 .0002 .0002

0.0002 .0002

... ... ...

10

Above 1% in. to 4 in. Diam.

...

.0003 .0003 .0003 .0003

.0003 .0003 .0003 .0003

.0003 .0003 .0003 .0003 .0003

.0004

.0004

.0004

.0004

.0004 .0004 .0004 .0004

.0004 .0004 .0004 .0004 .0004

.0003 ,0003 .0003 .0003 .0004

0.0003 .0003 0.00025 .00025 .00025 .00025 .00025 .00025 .0003

... ...

...

...

... ... ...

12

Above 8 in. to 12 in. Diam?

... ...

...

...

...

... ...

...

11

Above 4 in. fo 8 in. Diam.

Tolerance o n Pitch Diameter**4

NOTES: (1) Allowable variation in lead between any two threads shall not be farther apart than the length of the standard gage thatis shown in ANSI B47.1. (2) Above 12 in., the tolerance is directly proportional to the tolerance in col. 12, in the ratio of the diameter to 12 in. (3) See 5.13.9. (4) Tolerances apply to designated size of thread. Apply tolerance in accordance with Table 5.

6 5 4% 4

... ... .0003 .0003 .0003 .0003

.0006 .0007 .0007 .0007

... ... ... ...

0 0 0

6 6 5 5

.00025 .00025 .00025 -0003

...

10 9 8 7

...

.0006

0 0 0

.0015 .0015 .0015 .0015 .0015

.0006 -0006 .0006 .0006

.0009 .0009 .0009 .0009 .0009

.0006 .0006 .0006 .0006 .0006

6 6 6 6 6

0

0

.0002 .0002 .0002 .0002 .0002

.0002 .0002 .0002 .0002 .0002

14 13 12 11% 11

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

ul

.0001 .0001 .0001 .0001 .0001

.0007 .0007 .0007 .0007 -0009

.0005 .0005 .0005 .0005 .0006

.0005 .0005 .0005 .0005 .0006

8 8 8 8 8

0 0 0 0 0

.00015 .00015 .00015 .00015 .00015

.00015 .00015 .00015 .00015 .00015

27 24 20 18 16

0.0007 .0007

36 32 28

... ...

... ...

... .0001 .0001 .0001 .0001 .0001

.00015 .00015 .00015 .00015 .00015

.0001 .0001 .0001 .0001 .00015

40

44

56 48

... ...

0.0001 .0001 .0001 .0001 .0001

8

7

...

To and Including !4 in. Diam.

Above 4 in. Diam.

.0004 .0004 .0004 .0005 .0005

.0003 .0003 .0003 .0003 .0005

15 15 i2 12 8

0 0 0 0 0

0.00015 .00015 .00015 .00015 .00015

0.0001 .0001 .0001 .0001 .0001

80 72

64

0.0003 .0003 .0004 .0004 .0004

0.0003 .0003 ,0003 .0003 .0003

20 20 20 20 18

0 0 0 0 0

3

2

Above

1

To and

Threads/in. 4

T

Tolerance o n Major or Minor Diameters‘

Above % in. Diam.

Tolerance o n Half-Angle of Thread, deg. f min.

W GAGE TOLERANCES FOR THREAD GAGES

To and Including H in. Diam.

Tolerance on Lead‘”

TABLE 7

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

ASME BL.2

83

2575532 OOLLb87 8

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

ANSI/ASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

5-

.-

C

(a) Thread-Setting Ring for Maximum-Material Limit and GO Thread Gage

Form of relief optional

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

(b) Thread-Setting Ring for Minimum-Material Limit and NOT GO (HI) Thread Gage

FIG. 8 THREAD FORMOF SOLID THREAD-SETTING RING GAGES

26 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

/r

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST l

ASME B L - 2 83

2575532OOlLbAA

T

ANSI/ASME B1.2-1983 ANAMERICANNATIONAL STANDARD

GAGESANDGAGING FOR UNIFIED INCH SCREW THREADS

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

FIG. 9 MINOR DIAMETER LIMIT -CYLINDRICAL PLUG GAGES

or 180 deg. Size range for segment type is approximately 3/ 16 in, to 2-112 in. in diameter. Above 2-112 in., gage contacts are plain diameter rolls. Another design is the use of prism fingers for 3/ 16 i n , size and larger with contacts a€ 180 deg. See Fig. 10 for details. In eachdesign, the gages are set with cylindrical ring gages, outside micrometers, vernier calipers, or a gap made with gage blocks and jaw accessories. Gage contacts are collapsed into tapped hole and released to contact product minor diameter. Dial indicator gages givethe size of the product between minimum and maximum tolerance. Snap gages check the minor diameter limits by sensing the resistance at contact after being set to master.

The design of the GO andNOT GO cylindrical plain plug members has been standardized forvarious sues, ranges, and pitches. See ANSI B47.1. .

4.8.3 Identification. The cylindrical gage shall be marked with the nominal size, threadslin., thread series, GO or NOTGO, class on NOTGO, and minor diameter limits. EXAMPLE: 1/4-20 (or .250-20) UNC G0.1960 1/4-20 (or .250-20) UNC-2B NOT G0.2070

4.8.4 Precision Instruments (Table 2 - Gage 13). Precision instruments such as dial calipers, inside micrometer calipers, pocket slide calipers, and vernier inside calipers can also be used to measure the minor diameter of product internal thread.

4.8.6 Identification. After contacts have been assembled in the snap or indicating gage, the assembledgage should be tagged with the nominal size, threadslin., thread series, class, and minor diameter limits.

4.8.5 Snap (Table 2 - Gages 3.3 and 3.5) and Indicating Gages (Table 2 - Gages 3.3, 3.5, and 5.2): Plain Diameter Gages for Checking Minor Diameter of Internal Thread. Gages are made to the individual gage manufacturer’s standard with gaging contacts (segments or rolls) a t 120 deg.

EXAMPLE 1/4-20 (or .250-20) UNC-2B.1960 - .2070

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= 2575532

ASME B L - 2 83

OOLLb87 L

ANSI/ASME 61.2-1 983 AN AMERICAN NATIONAL STANDARD

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

TABLE 8 CAGE TOLERANCES FOR PLAIN CYLINDRICAL GAGES --`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

Tolerances, in. (Note 1)

Size Range, in. Above

To and Including

xx

X

Y

Z (Note 2)

zz

1

2

3

4

5

6

7

0.020 .825 1.510 2.510 4.510 6.510 9.010

0.825 1.510 2.510 4.510 6.510 9.010 12.010

0.00002 0.00003 0.00004 0.00005 0.000065 0.00008 0.00010

0.00004 0.00006 0.00008 0.00010 0.00013 0.00016 0.00020

0.00007

0.00010 0.00012 0.00016 0.00020 0.00025 0.00032 0.00040

0.00020 0.00024 0.00032 0.00040 0.00050 0.00064 0.00080

0.00009 0.00012 0.00015 0.00019 0.00024 0.00030

NOTES: (1) Tolerances apply to actual diameter of plug or ring. Apply tolerancesin accordance with Table 4. Symbols XX, X, Y, Z, and ZZ are standard gage tolerance classes. (2) Used as tolerance on piain cylindrical plug and ring gages to check minor diameter for internal

threads and outside diameter for external threads. Also used for masters for setting indicating thread gages where design permits.

4 . 9 Snap (Table 2 - Gage 3.4) and Indicating (Table 2 - Gage 5 . 1) Gages to Check Major Diameter of Internal Thread

threads/in., thread series major diameter limits, and MAJOR DIAMETER INTERNAL. EXAMPLE: 1/4-20 (or .250-20) UNC G 0 2 5 0 NOT GO (Customer’s Specifications) MAJOR DIAMETER INTERNAL

4.9.1 PurposeandUse. The minimum major diameter limit of the product internal thread is considered acceptable when the product thread accepts GO gages. If further gaging is required, 4.9.2 describes the types of gages used to check the maximum- and minimum-material limits of the major diameter.

4.10 Functional Indicating Thread Gages for Internal Thread (Table 2 Gages 4.1 and 4.3)

4.10.1 PurposeandUse. The GO indicating thread gage (4.1 and 4.3) inspects the maximum-material GO functional limit and size, A I and Az, and the NOT GO (HI) functional diameter limit and size, BI and B2, of product internal thread. By the use of segments, rolls, or fingers, the gage is also used to check roundness of pitch cylinder. Some types of indicating gages are set by using thread-setting ring gages. See 4.7. Other types may be setwith plain ring gages or with gage blocks and jaws. Readings indicate the position of product thread within the tolerance range.

4 . 9 . 2 Snapand Indicating Major Diameter Gages. Gages are made to manufacturer’s standard with 55 deg. maximum gage contacts at 180 deg. in theform of relieved threadcontacts.See Fig. 11, sketch (a) for segment type. Size ranges from approximately 3/16 in. to 2-112 in. Above 2-112 in., gage contacts are thread relieved rolls at 120 deg. See Fig. 11, sketch (b). Another design is the use of conical contact on onefinger and two “best size” thread balls on other contact as shown in Fig. 11, sketch (C). In each design, the indicating gages are set with cylindrical ring gages, outside micrometers, vernier calipers, or gap made with gage blocks and jaw accessories. Gage contacts are collapsed into tapped hole and released to contact product major diameter. Dial indicator gages give the size of the product between minimum and maximumtolerances. Snap gage checks the major diameter limit by sensing the resistance at contact after being set to master.

4.10.2 Basic Design. Indicatinggages have three contacts at 1.20 deg. or two contacts at 180 deg. Gages are made with segments, rolls, or fingers with the length of the functional GO gaging elements equal to the length of the standard GO thread plug gage. Internal product threads less than 3/16 in. in diameter are not practical to check with indicating gages.

4 . 9 . 3 Identification. After contacts have been assembled in the snap or indicating gage, the assembledgage should be tagged with the nominal size, 28

.

Copyright ASME International T Provided by IHS under license with ASME INo reproduction or networking permitted without license from IHS

4.10.3 Thread Form. The specifications for thread form on GOfunctional segments, rolls, or fingers are summarized in Table 4 and Fig. 12.

--

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i

ASME B 1 . 2

8 3 W 2 5 7 5 5 1 2 0011b70 A W ANSI/ASME B1.2-1983 ANAMERICANNATlONALSTANDARD

GAGESANDGAGING FOR UNIFIED INCH SCREW THREADS

Segments

(a) Three or Two Point Contact

(b) Three or Two Point Contact

.CE: E

Ir\ Prism fingers

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

T L

29 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

-,

C/ . /

.

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

YI

ASME B 3 - 2 8 3 M 2 5 7 5 5 3 20 0 3 3 6 7 2

T M

ANSI/ASME 61.2-1983 AN AMERICAN NATIONAL STANDARD

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

.-

Segments

U

L

.-0

f

I

r

C

.-Um

L

FIG. 11 SNAP AND INDICATING DIAMETER GAGES LIMIT ANDSIZE

- MAX.-MIN. MAJOR DIAMETER

30 --`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

Rolls

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

ASME B I - 2 83

2 5 7 5 5 1 2 OOL1672 1

ANSIIASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

0 0

W S I-

A

a

a

f

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

.025000 .027778 .031250 .035714

.037037 .041667 .050000 .055556 ,062500

.071429 .076923 .083333

.100000 .111111 .I25000 .I42857

.I66667 .200000 .222222 .250000

44 40 36 32 28

27 24 20 18 16

14 13 12 lllh 11

10 9 a 7

6 5 4'/! 4

.0210 .0239 .0258 .0281

.0146 .0158 .0171 .0188

.0115 .0122 .0129 .0133 .0137

.0073 .0079 .0090 .0097 .0105

.0052 .0056 .0060 .0065 .0071

0.0034 .0037 .0040 .0044 .0049

3

Truncation of co Truncated Setting Plug, O.O60J/S;it 0.0171,

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

1=:

.020833

p

1.012500 .013889 .015625

2

1

80 72 64 56 48

Pitch,

Threads/ in., n

,`---

.00833 .01000 .01111 .01250

.00500 .00556 .00625 .00714

.00357 .00385 .00417 .00435 .00451

.00185 .00208 .00250 Al0278 ,00313

.00114 .00125 .00139 .00156 .00179

0.00063 .00069 .00078 .00089 .00104

4

Half-Height of Cone Contact, 0.05p

.01450 .01740 .01933 .02175

.00870 .00967 .01088 .01243

.00621 .00669 ,00725 .00757 .00791

.00322 LOO361 .00435 .00483 .00544

.00198 .00218 .00242 .00272 .00311

0.00109 ,00122 .00136 .00155 .00181

5

.02083 .02500 .02778 .03125

.0125Q .01389 .01562 .01786

.03608 .04330 .0481i .05413

.02165 .02406 .02706 .03093

.01546 .01665 .oleo4 .01883 .01968

.00802 .00902 .01083 .01203 .01353

.00463 .00521 .00625 .00694 .00781 .00893 .OQ962 .01042 .01087 .01136

.00492 .00541 .00601 .00677 -00773

0.00271 .00301 .00338 .00387 .00451

8

.00284 .00312 .00347 .00391 .00446

0.00156 .00174 .00195 .00223 ,00260

7

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.01667 .02000 .02222 .02500

.01000 .01111 .01250 .01429

.00714 .00769 .00833 .00870 ,009OY

.00370 .00417 .00500 .00556 .00625

.00227 .00250 .00278 .00313 .00357

0.00125 .00139 .00156 .00179 .00208

6

Width of Flat on co Plug, p/a 0.125~

.04167 .05000 .05556 .06250

.02500 .02778 .03125 .03571

.01786 .01923 .02083 .02174 .02273

.00926 .01042 .01250 .01389 .01562

.00568 .00625 .00694 .00781 .00893

0.00312 .00347 .00391 .00446 .00521

9

-05413 .06495 .07217 .08119

.03248 .03608 .04059 .04639

.02320 .02498 .02706 .02824 .02952

.01203 .01353 .01624 .01804 .02030

.00738 .00812 .00902 .01015 .01160

0.00406 .00451 .00507 .00580 .00677

10

Dedendum of Ring Thread and Addendum of Plug Thread, 0.375H = 0.32471,

GAGE DIMENSIONS

Width of Flat on GO Ring, p/4 = 0251,

THREAD

Addendum of Ring Thread and Truncation of Internal Thread, M/4 = Q.25H = Q.216506p

FOR COMPUTING

Height of Gage Cone Contact, O.l1547H= O.lp

CONSTANTS

Distance Between Pitch Cylinder and Half-Height of Cone Contact, 0.0871,

TABLE 9

.I08253 .I29904 .I44338 .I62380

.064952 .072169 .081190 .092788

.046394 .049963 .054127 ,056480 .059047

.024056 .027063 .032476 .036084 ,040595

.014762 .016238 .018042 .020297 .023197

0.008119 .009021 .010149 .011599 .013532

11

Twice External Thread Height, .075H = 0.649519p h

.07217 .08660 .09623 .I0825

.04330 .04811 .05413 .06186

.03093 .03331 .03608 .03765 .03936

.01604 .01804 .02165 .02406 .02706

.00984 .01083 .01203 .01353 .01546

O.QO541 .00601 .00677 .00773 .00902

12

Half Height of Sharp VThread, H/Z = 0.w = O.QS3Olp

.144338 .I73205 .I92450 .216506

.086603 .096225 .I08253 .I23718

.061859 .066617 .072169 .075307 .078730

.036084 .043301 ,048113 .054127

.019682 .021651 .024056 .027063 .030929

0.010825 .012028 .013532 .015465 .018042

13

Height of Sharp VThread, H= 0.866025p

.18042 .21651 .24056 .27063

.I0825 .I2028 .13532 .I5465

.07732 .08327 .09021 .09413 .09841

.04009 .04511 .05413 .06014 .06766

.02460 .02706 .03007 .03383 .03866

0.01353 .01504 .01691 .01933 .02255

14

Double Height of Internal Thread, 1.25H = 1.082532p

ANSI/ASME 61.2-1 983 ANAMERICANNATIONALSTANDARD

GAGESANDGAGING FOR UNIFIED INCH SCREWTHREADS

tolerancerange.Other types may be set with gage blocks and jaws,plainring gages, or measuring machine.

4.10.4 ThreadCrests. The majordiameter of the GO segments, rolls, or fingers are equivalent to a P/8 flat with aplus gage tolerance. Thethread crests shall be flat in an axial plane and parallel to the axis of the segment, roll, or finger.

4.1 1 . 2 Basic Design. Indicatinggages have three contacts at 120 deg. or two contacts at 180 deg. Gages are made with segments, rolls, or ball design with cone and vee configuration (pitch diameter type) or ball only (thread groove diameter type). It is impractical toattempt checking internalproductthreads smaller than 3/ 16 in. with indicating gages.

4.10.5 Pitch Cylinder. The pitch cylinder of the segments, rolls, or fingers shall be round and straight within the gage pitchdiameter limits specified in Table 6.

4.10.6 Lead and Half-Angle Variations. Lead and half-angle variations on threadof segments, rolls, and fingers shall be within the limits specified. See Table 6.

4.1 1.3 Thread Form. The specifications for cone and vee segments are shown in Fig. 13; the ball design and thread groove diameter typeare shown in Fig. 14. 4.1 1.4 The major diameter of the cone and vee segments or rolls are made to manufacturer’s standard. See Figs. 13 and 14.

4.10.7 Thread Roots 4.1 0.7.1 Theminor diameter of the GO threaded segments, rolls, or fingers shall be cleared beyond a PI8 width of flat either by extension of the sides of the thread toward a sharp vee or by an undercut no greater than P/8 maximum width and approximately central.

4.1 1.5Identification. The gaging elements, segments, rolls, or ball fingers should be marked with nominal size and threadslin.When gage is assembled with proper gaging contacts, the indicating gage should be tagged with the nominal size, threadslin., thread series, class, PD, and pitch diameter.

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

4.10.8 Runout. The pitch andmajor cylinders of the threaded portion of the GO segments or rolls shall not exceed the runout as determined by measurements of runout (full-indicator movement) on each gaging member, with respect to pitch cylinder. Runout shall not exceed one-half X gage major diameter tolerance.

EXAMPLE: 1/4-20 (or .250-20) UNC-2B PD.2224

4.1 2 Indicating Runout Thread Gage for Internal Thread (Table 2 - Gage 4.7)

4.1 0.9 Identification. The gaging elements,segments, rolls, or fingers shall be identified by the nominal size and threadslin. When indicating gage is assembled with propercontacts, the gage should be tagged with thenominal size, threadslin.,thread series, class, PD, and pitch diameter limits.

4.1 2.1 PurposeandUse. This indicating gage inspects the runoutof the minor diameter to thepitch diameter of the product internal thread. Readings indicate the position of product minor diameter to the pitch diameter, M,, within the tolerance specified.

EXAMPLE: 1/4-20 (or .250-20) UNC-2B PD.2175-.2224

4.1 2.2Basic Design. Indicatinggages have three contacts, one plain and two threaded, at 120 deg.; or twocontacts,oneplainandonethreaded,at 180 deg. See Fig. 15, sketch (a). The range of segments is 3 / 16 in. and larger; the range of rolls is 1-314 in. and larger. The ball-type indicating gage has two balls on one contact engaging two threads, and one contact has a plain prism shaped finger 180 deg. apart from theball contact. See Fig. 15, sketch (b): the rangeis5}8 in. and larger. The indicating gage is set by a GO setting ringgage (see Fig. 8) with plain gaging contact on minor diameter of thread ring gage and the thread contact on pitch diameter of ring thread gage.

4.1 1 Minimum-Material indicating Thread Gages for Internal Thread (Table 2 - Gages 4.5 and 4.6) 4.1 1.1 Purpose and Use. The indicating thread gage inspects the minimum-material limit andsize (CI and C*,D,and Dz)of product internal threads. By the use of interchangeable segments, rolls,or balls, the gage is also used to check roundness and taper of pitch cylinder. Some types of indicating gages are set by using athread-settingring gage. See 4.7. Readings indicate the position of productthreadwithinthe 33 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

ASME B 1 . 2 8 3

rn 2575512

001Lb75 7

rn

ANSI/ASME 61.2-1983 AN AMERICAN NATIONAL STANDARD

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

34 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

-

:

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

Rolls

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

T

W

V

.-

balls

Ball Design

J

E, .U

L (U W

/

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

-,

Gaging contacts with radius one-half ':best size" thread wire diarn.

FIG. 14 INDICATING THREAD GAGES - MINIMUM-MATERIAL PITCH DIAMETER LIMIT AND SIZE - BALL AND RADIUS

Two or Three Contacts

.-E

r

U

Gaging contacts with "best size" thread

Floating apart -spaced 3 pitches

Two rolltype: two ribs on one roll, one r i b o n other roll one-half itch apart

Three roll type: one rib on each roll one-third pitch apart

P

Z D

C O

ANSI/ASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

//

I

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

'\ \\

Total segment contact to be minimum 25% of circumference

Two or Three

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

FIG. 15 INDICATING THREAD GAGES - DIAMETER RUNOUT - MINOR TO PITCH Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

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36

ASME 8 3 . 2 83 W 2 5 9 5 5 3 2 003Lb98 2 ANSVASME 81.2-1983 ANAMERICANNATIONAL STANDARD

GAGESANDGAGING FOR UNIFIED INCH SCREW THREADS

4.12.4 Thread Crests. The threadcrests shall be flat in an axial plane and parallel to axis of segment or roll. 4.12.5 Lead and Half-Angle Variations. Lead and half-angle variations on threaded segments or rolls shall be within the limits specified. See Table6.

’

4.12.6 Identification. The gaging elements, segments, rolls, or ball finger should be marked with the nominal size and threads/in; When gage is assembled withproper gaging contacts, the indicating gage should be tagged with the nominal size, threadslin., thread series, class, and RUNOUT. EXAMPLE 1/4-20 (or .250-20) UNC-2B RUNOUT

4.13 . 2 Cumulative Thread Element Variation Differential. Indicating gages have either three contacts at 120 deg. spacing or two contacts at 180 deg. spacing. The indicating gages with segments or rolls as shown in Figs. 12 and 16, sketch (a) give the functional size indicating reading, Z, The indicating gages with cone and vee segments or rolls with one thread pitch englgement at pitch diameter line, Fig.13, and thread groove diameter type, Fig.14, sketch (a) or (b), or both, shown in Fig. 16, sketches (C) and (d),give the pitch diameter size indicating reading, X. The difference in the indicator readings, X - Z, between the two typesof gages givesthe cumulative form differential reading which corresponds to the pitch diameter equivalent, ADzCZ,for the combination of lead, helix, flank angle, roundness, and taper variations on the product thread. See Fig. 16. 4.13 . 3 Single Thread Element Variation Differential 4.1 3.3.1 Lead (Helix) Differential Reading. The indicating gage reading, Y, using the full-form thread segments or rolls with one thread pitch engagement, similar to Figs. 12 and 16, sketch (b), is compared to the reading, Z, using the functional size gage shown in Figs. 12 and 16, sketch (a). The difference between the measured values, Y - Z, is the lead differential reading which corresponds to the pitch diameter equivalent, A D A , for the lead and helix variation of the product thread.

4.13 Differential Gaging (Table 2 Gage 4.8)

4.1 3.1 The concept of differential gaging for product internal screw threads makes use of fundamental geometric theorems that relate directly to size, position, and form. For differential gaging, two methods are used for measuring screw thread size: (a) GO functional size (b) pitch diameter (or thread groove diameter) Only when a screw thread has perfect position and form [i.e., zero variation in lead (including helical path), flank angle, taper, and roundness] are these two measurements equal. Differential gaging is a variables method of in-process inspection, final conformance inspection, or both, that provides the actual numerical values for both GO functional and pitch diameter sizes. These are the two extreme sizesof any product screw thread. One of the sizes, pitch diameter, is the size of the thread pitch diameter with essentially zero variation in all other threadelements, while the other size, GO functional size, is the size of the thread with the effects of all variations in all other thread elements added to the pitch diameter. The numerical difference between these two sizes is called a cumulative thread element variation dfferentia1 and represents the diametral effect of the total amount of thread element variations. The inspection process that further refines the total amount of thread element variation so that the amount

4.13.3.2 Flank Angle Differential Reading. The indicating gage reading, X, using segments or rolls with cone and vee design,Figs. 13 and 16, sketch (C),is compared to reading, Y, using the full-form thread segments or rolls, similar to Figs. 12 and 16, sketch (b). Both designs have one thread pitch engagement. The difference between the measured values, X - Y, is the flank angle differential reading which corresponds approximately to the pitch diameter equivalent, A D Z = ,for the combined flank angle variation on the product thread. 4.13.3.3 Roundness and TaperDifferential Readings. By the use of full-form thread segments or rolls with one thread pitch engagement, similar to Figs. 12 and 16, sketch (b); cone and vee segments or rolls, Figs. 13 and 16, sketch (C);or thread groove diameter type, Figs. 14, sketch (a) or (b), and 16, sketch (d), the roundness andtaper of pitch cylinder is 37

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

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--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

of variation for each individual element becomes known is called singlethread element variation differential.

4.12.3 Thread Form. The specifications for thread form on vee segments or rolls are summarized .in Fig, 15. Plain contacts have line bearing on minor diameter of product. Balls are “best size” thread ball contacting thread at pitch line.

ASME 8 3 . 2 8 3 W 2 5 7 5 5 3 2 0033677 L1 W

ANSIIASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

Functional diameter.

Two or Three Contacts

also used for

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

Indicator r e d i n g GO functional size details)

Pitch diameter

In

also used for lead and

I

or

Two

.

to "

Three

.

Pitch diameter

rn

Indicator reading measured pitch diameter Y

(C) (d)or

(See Fig. 13)

I .

A D p c = X-2 =cumulative form differential analysis A D 2 h = Y - Z = individual element analysis for lead variation A D 2 a = X-Y = individual element analysis for angle variation

FIG. 16 INDICATING THREAD GAGES - DIFFERENTIAL GAGING Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

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(See Fig. 14)

(d)

ANSI/ASME 61.2-1983 AN AMERICAN NATIONAL STANDARD

GAGESANDGAGING FOR UNIFIED INCH SCREW THREADS

Cone and vee NOT GO (HI) profile or PD contact (see Fig. 3 or 13)

checked. Rotatetheproduct between contacts at different axial locations on threadfor maximum difference in roundness andtaper readings. Two contacts spaced 180 deg. apart give even lobing outof-round measurement. Three contacts spaced 120 deg. apart give odd lobing out-of-round measurements.

i'

4.13.4 Thread Form. The functional segments or rolls, Fig. 16, sketch (a), are described in 4.10. The full-form one thread vee segment or roll, Figs. 12 and 16, sketch (b) upper contact, has a depth ofthread equivalent to the functional type, but relieved on the outside thread flanks. The full-form cone segment or roll, Figs. 12 and 16, sketch (b) lower contact, has a PI8 flat on outside diameter. The cone and vee segments or rolls, Fig. 16, sketch (C), are described and shown in Fig. 13. Thread groove diameter type, Fig. 16, sketch (d), is described and shown in Fig. 14.

U

Inside Micrometer Caliper Type. (Ref. Table 2 BI, B2, C l , Cq,

-

E l , Ea. Glr Gp)

4.1 3.5 Identification. The gaging elements, segments, or rolls should be identified by nominal size andthreadslin. Indicating gages,assembled with proper contacts, should be tagged with nominal size, threads/in., thread series, class, and the type of differential reading specified above.

FIG. 17 INSIDE MICROMETER, CALIPER TYPE

4.16 Optical Comparator and Toolmaker's Microscope (Table 2 - Gage 9)

EXAMPLE: 1/4-20 (or ,250-20) UNC-2B Flank angle differential variation

4.16.1 Purpose and Use. The optical comparator magnifies and projects the thread profile on a screen. Internal threads are checked using cast replicas. For best profile image, the threaded item is positioned so that the light is aligned with the thread lead angle. Since the thread profile is defined in a plane containing theaxis, a correction factor must be added to the measured flank angle observed normal tothe lead angle. For most standard singlelead threads, the correction factor is lessthan 0 deg., 5 min. Optical comparators aregenerally fitted with lenses providing various magnifications between 1OX and 1OOX. Profile dimensions are checked using appropriate linear and angular scales on the machine and by application of thread profile, radius, and other overlay charts. Flank angles, thread crest and root flats, root radius, other groove and ridge dimensions, and axial plane pitch and lead may be checked. Major, minor, and pitch diameters are identified, then measured using table traverse readouts.

4.14 Pitch Micrometers (Table 2 Gages 6 and 7 ) 4.14.1 Purpose and Use. Inside micrometers, caliper type, are direct reading measuring instruments, Cone and vee contact points are modified for a NOT GO (HI) profile or pitch diameter contact only, See Fig. 17.

4.15 Thread-Measuring Balls (Table 2 - Gage 8 ) 4.15.1 Purpose and Use. One indicating gage using thread-measuring balls as gaging elements inspects the pitch diameter of the internal thread. It is shown in Fig, 14, sketch (a). Special fixturing and ball probes may be required when using a three-axis coordinate measuring machine forinternal measurement of pitch diameter. See Appendix B9 and B10 for more informationon thread-measuring balls.

4.16 . 2 The toolmaker's microscope is similar'in function to the optical comparator but does not include screen projection or overlay charts. Magnifi39

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

ASME 81a-2-83m 2 5 7 5 5 1 2 0011701 7

m GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

ANSVASME 61.2-1983 AN AMERICAN NATIONAL STANDARD

cations are generally lower than those of optical comparators. Profile reticules are used in place of charts.

4.20 Miscellaneous Gages and Gaging Equipment

4.20.1 The description of internal gages in 4.1 through 4.19is definitely not a complete catalog of the various types available for inspection purposes. The gages not described above may be used provided they adhere to the standard thread practice noted in this Standard (i.e., truncation, form of thread, tolerance, etc.) and have producer and consumer agreement.

4.17 Profile Tracing Instrument (Table 2 - Gage IO) 4.17.1Purpose and Use. Theinstrument inspects thread contour to anaccuracy of 0.0002 in. for 1 in. of horizontal and 0.100 in. of vertical travel at IOOX magnification. The tracing on the chart paper may be analyzed for elements of the thread profile, including depth, crest width, lead, angle, and radius at root of thread. The instrument is generally able to check internal threads of 0.1875 in. and larger at magnifications from 5X to 1OOX.

5 TYPES OF GAGES FOR PRODUCT EXTERNAL THREAD

5.1 GO Working Thread Ring Gages (Table 1 - Gage 1 .I) 5.1.I Purposeand Use. The GO thread ring gage inspects the maximum-material GO functional limit, A I ,of product external thread. The GO thread ring gage when properly set to its respective calibrated thread-setting plug represents the maximum-material GO functional limit of the product external thread, and its purpose is to assure interchangeable assembly of maximum-material mating parts. Adjustable GO thread ring gages must be set to the applicable W (see Table 5, Note 2) tolerance-setting plugs. The product thread must freely enter the GO thread ring gage for the entire length of the threaded portion.The GO thread ring gage is a cumulative check of all threadelements except the majordiameter.

4.18 Surface Roughness Equipment (Table 2 - Gage 14) 4.18.1 Purpose and Use, Measurement of surface roughness on screw thread flanks is usually made with an instrument which traverses a radiused stylus across the lay. The stylus displacement due to the surface irregularities is electronically amplified and the meter reading displays the arithmetical average roughness height in microinches (see ANSI B46.1, Surface Texture: Surface Roughness, Waviness, and Lay). Some instruments produce a chart of the traced path which shows the peak-to-valley heights of the surface irregularities. Special fixturing is required to position and guide stylus over thread surface.

5.1.2 Basic Design. The maximum-material limit or GO thread ring gage is made to the prescribed maximum-material limit of the product thread, and the gaging length is equal to the thickness of the thread ring gage.

4.19 Roundness Equipment (Table 2 - Gage 15) 4.1 9.1 Purpose and Use. There are two types of precision roundness measuring instruments: precision rotary tables and precision spindles. A special stylus coupled to an electric unit records the out-ofroundness on a circular chart as it traces around the internal cylindrical surface of the workpiece. The instrument provides a series of magnifications for stylus displacement, a filtering system for isolating lobing from surface irregularities, various means for centering the amplified stylus trace on the polar chart, anda selection of rotating speeds. For details on measuring and forother methods for checking roundness,see ANSI B89.3.1, Measurement of Out-ofRoundness.

5.1.4Thread Form. The specifications forthread form are summarized in Table 4 and Fig. 18. 5.1.5Thread Crests. The minor diameter of the GO thread ring gage shall be equal to the maximum pitch diameter of the product external thread minus H I 2 with a minus gage tolerance. This corresponds to a width of flat of P/4. The thread crests shall be flat in an axial section and parallel to the axis.

40 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

(“---7

/ r.

(Section 5 continues on P. 127.)

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--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

5.1.3 Gage Blanks. For practical and economic reasons, the designs and thicknesses of thread ring gages have been standardized for various size ranges and pitches (see ANSI B47.1 or Table A4).

UNC

2-64 or 0.086-64

3-48

UNC

4-40

or 0.112-40

UNF

3-56 or 0.099-56

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

:/--, 0J

-

UNF

or 0.086-56

2-56

or0.099-48

UNC

or 0.073-72

l-72

UNF

UNC

l-64

or 0.073-64

UNF

2

Series Designation

.0867 .0865 .0874 .0872

2A

3A

2A

3A

3A

.0950 .0948 .0958 .0956

.0848 .0846 .0855 .0853

2A

3A

.0753 .0751 .0759 .0757

.0738 .0736 .0744 .0742

.0634 .0632 .0640 .0638

i

.0842 .0838 .0850 .0846

.0790 .0786 .0797 .0793

.0758 .0754 .0765 .0761

.0685 .0681 .069-l .0687

.0661 .0657 .0667 .0663

.0574 -0571 .0580 .0577

.0555 .0551 .0561 .0557

in. 0.0460 .0457 .0465 .0462

in. 0.0514 .0512 .0519 .0517 .0623 GO621 .0629 .0627

5

Minor

4

Pitch Diam.

GO

X Thread

.0925 .0927 .0939 .0941

.0845 .0847 .0858 .0860

.0825 .0827 .0838 -0840

-0733 .0735 .0744 .0746

.0871 .0875 .0885 .0889

.0806 .0810 .0819 .0823

.0780 .0784 .0793 .0797

.0699 .0703 .0710 .0714

.0678 .0682 .0689 .0693

.0585 .0588 .0596 .0599

.0569 .0573 .0580 .0584

i

.I112 .I111 .1120 .I119

.0983 .0982 .0990 .0989

.0983 .0982 .0990 .0989

.0854 .0853 .0860 .0859

.0854 .0853 .0860 .0859

.0724 .0723 .0730 .0729

.0724 $0723 .0730 .0729

in. 0.0595 .0594 -0600 .0599

8

GO

-

--

.I061 .I062 .I069 .I070

.0942 .0943 .0949 .0950

.0938 .0939 .0945 .0946

.0816 .0817 .0822 .0823

.0813 .0814 .0819 .0820

.0689 .0690 .0695 .0696

.0686 .0687 .0692 .0693

in. 0.0563 .0564 .0568 .0569

9

NOT GO

Z Plain Gages for Major Diameter

Threads

in. 0.0469 .0472 .0479 .0482

7

Minor Diam.

GO (LO)

External

.0717 .07119 .0728 .0730

.0615 .0617 .0626 .0628

.0603 .0605 .0614 .0616

in. 0.0496 .0498 .0506 -0508

6

Pitch Diam.

NOT

Gages

for

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

Gages

T

.I120 .I124 .I120 .1124

-0990 .0994 .0990 .0994

.0990 .0994 .0990 .099A

.0860 .0864 .0860 .0864

.0860 .0864 .0860 .0864

.0730 .0733 .0730 .0733

.0730 .0734 .0730 .0734

in. 0.0600 .0603 .0600 .0603

10

Major Diam.

GO

.0958 .0960 .0958 .0960

.0874 .0876 .0874 .0876

.0855 .0857 .0855 .0857

.0759 .0761 .0759 .0761

.0744 .0746 .0744 .0746

.0640 .0642 .0640 .0642

.0629 .0631 .0629 .0631

in. 0.0519 .0521 .0519 .0521

11

Pitch Diam.

X Thread

Gages

,I099 .I095 .I090 .1086

.0979 .0975 .0972 .0968

.0975 .0971 .0967 .0963

.0854 .0850 .0847 .0843

.0849 .0845 .0842 .0838

.0725 .0722 .0719 .0716

.0723 .0719 .0716 .0712

in. 0.0596 .0593 .0590 .0587

12

Major Diam.

NOT

Gages

for

)

GO

--

.0991 .0989 .0982 .0980

.0902 .0900 .0895 .0893

.0885 .0883 .0877 .0875

.0786 .0784 .0779 .0777

.0772 .0770 .0765 .0763

.0665 .0663 .0659 .0657

.0655 .0653 .0648 .0646

.0849 .0850 .0849 .0850

.0797 .0798 .0797 .0798

.0764 .0765 .0764 .0765

.0691 .0692 .0691 .0692

.0667 .0668 .0667 .0668

.0580 .0581 .0580 .0581

.0561 .0562 .0561 .0562

in. 0.0465 .0466 .0465 .0466

14

GO

.0939 .0938 .0939 .0938

.0865 .0864 .0665 .0864

.0845 .0844 .0845 .0844

.0753 .0752 .0753 .0752

.0737 .0736 .0737 .0736

.0635 .0634 .0635 .0634

.0623 SO622 .0623 .0622

in. 0.0514 .0513 .0514 .0513

15

NOT GO

Z Plain Gages for Minor Diameter

T

Threads

in. 0.0542 .0540 .0536 .0534

13

Pitch Diam.

(HI)

Internal

GAGES FOR STANDARD THREAD SERIES, CLASSES IA, 2A, 3A, lB, 2B, AND 3B UNIFIED SCREW THREADS - LIMITS OF SIZE

2A

3A

2A

3A

2A

3A

2A

3A

2A

3

Class

TABLE 10

O-80 or 0.060-80

1

Nominal Size and Threads/in.

.P !I-

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

T

3B

2B

38

2B

38

2B

38

28

3B

2B

3B

2B

38

2B

38

28

16

Class

h,

P

UNF

UNC

UNF

UNC

6-40or 0.138-40

8-32or 0.164-32

8-36or 0.164-36

10-24.or 0.190-24

UNF

5-44or 0.125-44

UNC

UNC

5-40or 0.125-40

~~

UNF

-

3A

.I6192A

,14603A

2A

.I4373A

.I4282A

3A

.I2102A

.I1773A

.I1692A

-11023A

-1460 .I462 .I460 .I462

.I 629.I852 .I632 .I847 .I629 .I841 .I632 .I836

.I640 -1644 .I640 .I644 .I900 .I905 .I900 .I905

.I577 .I578 .I585 .I586 .I818 ,1819 .I828 .I829

.I632 .I631 .I640 .I639

.I364 .I368 .I379 .I383 .I496 .I501 .I514 .I519

.I424 .I426 .I439 .I441 ,1586 .I439 ,1434 .I583 .I449 .I604 .I444 .I607 .. -. . .. - .

.I332 .I328 .I340 .I336

.I437 .I440 .I437 .I440

.I640 .I645 .I640 .I645

.I571 ,1572 .I580 .1581, .I631 .I630 .I640 .I639 .I331 .I336 .I347 .I352

1399 .I293 .I 288 .I402 .I302 .I415 .I297 .I418

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

"_

.I890 .I889 .I900 .I899

.I218 -1220 .I218 .I220

.I380 .I384 .I380 .I384

.I321 .I322 .I329 .I330 .I372 .I371 .I380 -1379

.I130 .I134 -1144 .I148

"

.I 6 61 .I612 .I607 .I603

"

.I610 .I605 .I600 .I595

.I360 .I356 -1351 .I347

.I349 .I344 .I339 .I334

.I 102.I184 .I098 .I186 .I110 .I198 -1106 .I200

.I372 .I371 .I380 .I379

.I196

.I177 .I180 .I177 .I180

.IO72 .IO83 .I085

in.

in.

14 15

CO

.0979 .0980 .0979 .0980

.I672 .I669 .I661 .I658

.I496 .I494 .I487 ,1485

.I475 .I472 .I465 .I462

.I252 .I250 .I243 .I241

,1214 .I211 .I204 .I201

.I390 .I389 .I389 .I388

.I190 .I189 .I186 .I185

.I140 .I139 .I140 .I139

.I079 -1078 .I079 .I078

-1062 .I061 .I062 .I061

.I450 ,1451 .I450 .I451

.I560 .I559 .I555 .I554

3B

28

3B

42028

-

3B

28

3B

2B

-

38

2B

38

2B

38

28

-

38

28

16

Class

-

T

in. 0.0968 .0967 .0968 .0967

NOT CO

.I 340 .I .I341 .I419 .I340 .I416 .I341 .I415

.I300 .I301 .I300 .I301

.I110 .I111 .I110 .I111

.IO40 .IO41 .I040 .I041

.I134 .I004 .I132 .I005 .IO04 .I126 .I 124.I005

.I229 -1121 .I 225 .I119 .I113 .I221 .I217 .I111

.I380 .I385 .I380 .I385

.I088 .IO90 .I088 .IO90

.I312 .I313 .I320 .I321

.I250 .I254 .I250 .I254

.IO73 .IO78 .IO88 .IO93

.I

.I191 .I192 .I199 .I200

In.

13 -

-

Pitch Diam.

for

Minor Diameter

T-Z Plain Gages

0.1 1060.1016 0.0894 .I102 -1014 .0895 .0894 .I098 .I008 -1094 .I006 .0895

.I141 .IO34 .I 029.I144 .I 156 .I042 174 .IO37 .I159

-

.I616 ,1629 .I626

.I458

in.

12

11

,1102 .I232 .I104 .I228 .I102 .I224 220 .I104 .I

.I452 -1450

.I434

.I425

.I208 .I218 .I216

.I

.I166

.I

In.

Major Diam.

NOT CO (HI)

Pitch Diam.

r

0.1068 0:1120 0.0985 -1069 .I124 .0987 .I 075 .I120 .0985 .I076 .I 124.0987

in.

10

Major Diam.

CO

X Thread Cages

195 -1250 .I254 .I202 .I250 .I203 .I254

.I070

.I242 .I241 .I250 .I249

0.1113 .I112 .I120 .I79

9

NOT CO

t

t

r

Cages for Internal Threads

-1243 .I021 .I 025.I242 .IO34 .I250 .I249 .IO38

.0997 .0993 .I004 100 .IO00

.IO93

.I0952A

.I0883A

0.0909 .0913 .0922 .0926

in.

8

7

in.

CO

Z Plain Cages for

Minor Diam.

.I 054 .IO00 .IO04 .I056 .IO15 .I 069 .I 071 .IO19

0.0888 0.0954 .0884 .0956 -0895 .0967 .0891 .0969

in.

6

5 In.

Pitch Diam.

Minor Diam.

.0972 .I 078 .0968 .0980 .0976 .I086

.0983

.0976

in.

4

Pitch Diam.

.I0802A

.09853A

0.0978 2A

3

2

1

4-48or 0.112-48

~~

6-32or 0.138-32

~

Class

Series Designation

Nominal Size and Threads&

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

I

\ -

TABLE 10 GAGES FOR STANDARD THREAD SERIES,CLASSES l A , 2A, 3A, IB, 2B, A N b 3B UNIFIED SCREW THREADS LIMITS OFSIZE (CONT'D)

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

UNC

UNF

UNEF

y4-20or 0.250-20

y4-28 or 0.250-28

1/4-32or 0.250-32

UNF

12-28or 0.216-28

UNEF

UNC

12-24or 0.216-24

12-32or 0.216-32

UNF

2

1

10-32or 0.190-32

Series Designation

Nominal Size and Threads/in.

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

W

P

_ _ _

3A

2A

3A

2A

1A

-

3A

2A

1A

-

3A

2A

-

3A

2A

-

3A

2A

-

3A

2A

3

Class

r

.I699

.I763 .I758 .I773 -1768

.I709 .I704

.I 694

.2287 .2284 .2297 .2294

.2258 .2255 .2258 .2255 .2268 .2265

.2164 .2161 -2164 .2161 2175 .2172

.2255 .2258 .2273 .2276

.2208 .2211' .2225 .2228 .2243 .2246

2108 .2111 .2127 .2130 .2147 .2150

.2187 .2192 .2205 .2210

.2131 .2136 .2148 .2153 .2166 .2171

.2000 .2005 .2019 .2024 .2039 .2044

.2499

.2490 .2489

.2500

.2490 .2489 .2490

.2489 .2488 .2489 -2488 .2500 .2499

.2151 .2150 .2160 .2159

.2150 .2149 .2160 .2159

.2150 .2149 .2160 .2159

0.1891 .I890 .I900 .I899

In.

8

GO

.2441

.2430 .2431

.2392 -2393 .2425 .2426 .2435 .2436

.2367 .2368 .2408 .2409 .2419 .2420

.2091 .2092 .2100 -2101

.2085 .2086 .2095 .2096

.2078 .2079 .2088 -2089

0.1831 .I832 .I840 .I841

in.

9

NOT GO

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

.2152 .2147 .2162 .2157

.2103 .2098 .2103 .2098 .2113 .2108

.I947 .I 942 .I947 .I942 .I958 .I 953

.I849 .I854 .I865 .I 870

.I 809 -1814 .I 827 .I832

.I886 .I889 .I904 .I907

.I755 .I760 .IT73 .I778

0.1590 .I595 .I606 .I611

in.

7

Minor Diam.

I

Plain Gages forMajorDiameter

r4 z

.I845 .I848 .I863 .I866

.I948 .I813 .I917 .I 945 .I 808 ,1920 .I957 .I822 .I933 .I817 -1954 .I 936

,1918 .I915 .I 928 .I925

in.

6

Pitch Diam.

NOT GO (LO)

'0.1553 0.1658 .I548 .I661 .I562 .I674 .I557 .I677

In.

5

Minor Diam.

.I879 .I 876 .I889 .I886

0.1688 .I685 .I697 .I694

in.

4

Pitch Diam.

GO

X Thread Gages

Gages for External Threads

1

I

.2500 .2505 .2500 .2505

.2500 .2505 .2500 .2505 .2500 .2499 .2505

-2500 .2505 .2500 .2505 .2500 .2505

.2160 .2165 .2160 -2165

.2160 .2165 .2160 .2165

.2160 .U65 .2160 .2165

0.1900 .I905 .T900 ,1905

in.

10

Major Diam.

.I957 .I960 .I 957 .I960

.I928 .I931 .I928 .I931

-1889 .I892 .I889 .I892

0.1697 .I700 .I697 .I700

in.

11

Pitch Diam.

.2297 .2300 .2297 .2440 .2300

.2268 .2271 .2268 .2271 .2268 .2271

.2175 .2178 .2175 .2178 .2175 .2178

.2474 .2469 .2500 .2463 .2458

.2488 .2483 .2466 .2461 .2455 .2450

.2465 .2460 .2441 .2436 .2428 .2423

.2133 .2128 .2123 .2118

.2125 .2120 .2114 .2109

.2113 .2108 .2102 .2097

0.1871 .I866 .I861 -1856

in.

12

1

in.

.2339 .2336 .2328 .2325

.2333 .2330 .2311 .2308 .2300 .2297

.2248 .2245 .2224 .2221 .2211 .2208

in.

.2160 .2161 .2160 .2161

.2110 .2111 .2110 .2111 .2110 .2111

.I960 .I961 .I960 .I961 .I960 .I961

.I820 .I821 .I820 .I821

.I770 ,1771 .I770 .I771

.?i'IO .I711

.I711

.I710

0.1566 .I561 .I560 .I561

l i

.I998 .I995 .I988 .I985

_r_

.I970 .I 967 .I959 .I956

-

.I933 .I930 .I922 .I919

0.1736 -1733 .I726 .I 723

14

GO

-2240 .2239 .2229 .2228

200 .2199 2200 .2199 .2190 .2189

.2070 .2069 .2070 .2069 .2067 .2066

.I900 .I899 .I895 .I894

.I860 .I859 .I857 .I856

.I810 .I809 .I807 .I806

0.1640 .I639 .I641 .I640

in.

15

NOT GO

Minor Diameter

T Z Plain Gages for

13 -

Pitch Diam.

NOT GO (HI) Major Diam.

"

GO

X Thread Gages

Gages for Internal Threads

TABLE 10 GAGES FOR STANDARD THREAD SERIES,CLASSES l A , 2A, 3A. I B . 2B. A N D 3B UNIFIED SCREWTHREADS - LIMITS OF SIZE (cÖNT'D)

3B

28

3B

2B

1B

3B

28

1B

3B

28

38

2B

3B

2B

3B

28

16

Class

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

UNF

UN

UNEF

UNC

UN

716-24 or 0.3125-24

776-28 or 0.3125-28

716-32 or 0.3125-32

78-16 or 0.375-16

78-20 or 0.375-20

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

2

UN

%6-20 or 0.3125-20

.3413 .3410 .3425 .3422

2A

.2912 .2909 .2922 .2919 .3331 .3328 .3331 .3328 .3344 .3341

3A

3A

2A

.2728 .2723 .2738 .2733

.2663 .2658 .2663 .2658 .2674 .2669

.2571 .2566 .2583 .2578

.3196 .3191 ,3208 .3203

.3060 .3054 .3060 .3054 .3073 .3067

.2777 .2772 .2787 .2782

1

.2883 .2880 .2893 -2890

.2843 .2840 .2843 .2840 .2854 .2851

.2788 .2785 .2800 .2797

1A

3A

2A

3A

2A

3A

2A

1A

3A

2A

3A

2A

.3738 .3737 .3750 .3749

.3737 .3736 .3737 .3736 .3750 .3749

.3115 .3114 .3125 .3124

.3115 .3114 .3125 .3124

.3114 .3113 .3114 .3113 .3125 .3124

.3113 .3112 .3125 .3124

0.3113 .3112 .3113 .3112 .3125 .2124

In.

a

GO

.3657 .3658 .3669 .3670

.3595 .3596 .3643 .3644 .3656 .3657

.3055 .3056 .3065 .3066

.3050 .3051 .3060 .306l

.3006 .3007 .3042 .3043 .3053 .3054

.3032 .3033 .3044 .3045

0.2982 .2983 -3026 .3027 .3038 .3039

In.

9

NOT GO

2 Plain Gages for Major Diameter

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

.3264 .3269 .3286 .3291

.3131 .3137 .3152 .3158 .3176 .3182

-2812 .2817 .2830 .2835

,2772 .2777 .2790 .2795

.2698 .2703 .2716 .2721 .2737 .2742

.2640 .2645 .2662 .2667

in. 0.2571 .2576 .2592 .2597 .2614 .2619

7

-

1

r

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

,3372 .3375 .3394 .3397

.3266 .3269 .3287 .3290 .3311~ .3314

.2880 .2883 .2898 .2901

.2849 -2852 .2867 .2870

.2788 .2791 .2806 .2809 .2827 .2830

-2748 .2751 .2770 -2773

0.2691 .2694 .2712 .2715 .2734 .2737

in.

0.2511 .2506 .2511 .2506 .2523 .2518

in. 1A

UNC

or 0.3125-1 8

0.2752 ,2749 .2752 .2749 .2764 .2761

5

.In..

4

3

2

1

716-1 8

6

Minor Diam.

Pitch Diam.

Minor Diam.

NOT GO (LO)

Pitch Diam.

r

Class

CO

X Thread Gages

Gages for External Threads

Series Designation

t r

r

Nominal Size and Threads/in.

T

r t t

.3750 .3755 .3750 .3755

.3750 .3756 .3750 .3756 .3750 .3756

.3125 .3130 .3125 .J130

.3125 .3130 .3125 .3130

.3125 .3130 .3125 .3130 .3125 .3130

.3125 .3130 .3125 .3130

0.3125 .3130 .3125 .3130 .3125 .3130

in.

10

Major Diam.

.3425 .3428 .3425 3428

.3344 .3347 .3344 .3347 .3344 .3347

-2922 .2925 .2922 .2925

.2893 .2896 $2893 .2896

.2854 .2857 .2854 ,2857 .2854 .2857

.2800 .2803 .2800 .2803

0.2764 .2767 -2764 .2767 .2764 .2767

in.

11

Pitch Diam.

GO NOT GO (HI)

in.

13

.2964 .2961 .2953 .2950

)

.3696 .3479 .3691 .3476 .3682 .3465 .3677 .3462

.3700 .3429 .3694 -3426 .3672 .3401 .3666 .3398 -3658 .3387 .3652 .3384

.3099 .3094 .3088 .3083

.3092 .2937 .3087 .2934 .3081 .2926 .3076 .2923

.3105 .2925 .3100 .2922 .3082 .2902 .3077 .2899 .3070 .2890 .3065 -2887

.3069 .2852 .3064 .2849 .3056 .2839 .3051 .2836

1.3084 0.2843 .3079 2840 .3058 .2817 .3053 .2814 .3044 .2803 .3039 .2800

in.

12

Pitch dajor Xam. Diam.

r

~________

X Thread Gages

~

I

.3210 .3211 .3210 .3211

.3070 .3071 .3070 .3071 .3070 .3071

.2790 2791 .2790 .2791

.2740 .2741 .2740 .2741

.2670 .2671 .2670 .2671 .2670 .2671

.2580 .2581 .2580 .2581

0.2520 .2521 .2520 .2521 .2520 .2521

in.

14

GO

.3320 .3319 .3297 .3296

.3210 -3209 .3210 .3209 .3182 .3181

.2860 .2859 .2847 ,2846

.2820 .2819 .2807 .2806

.2770 ,2769 .2770 .2769 .2754 .2753

.2700 .2699 .2680 .2679

0.2650 .2649 .2650 .2649 .2630 -2629

in.

15

NOT GO

Z Plain Gages for Minor Diameter

Gages for Internal Threads

TABLE 10 GAGES FOR STANDARD THREAD SERIES, CLASSES l A , 2A, 3A, lB, 2B, A N D 3B UNIFIED SCREW THREADS- LIMITS OF SIZE (CONT'D)

-

38

2B

-

38

2B

1B

38

28

-

3B

28

-

3B

2B

1B

38

2B

38

2B

?B

16

-

Class

T

-_ 0

or 0.4375-16

or 0.4375-20

or 0.4375-28

7/6-20

716-28

or 0.4375-14

7/x-16

7/w-14

or 0.375-32

%-32

UNF

UNEF

UN

or0.375-28

h-28

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

:

R

UNF

1

Nominal Size and Threads/in.

I

TABLE 10

Ya-24 or 0.375-24

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

3A

2A

1A

2A

3A

2A

3A

2A

IA

)

t

r

.4096 .4099 .4116 .4119

.3977 .3972 .3988 .3983 .4132 .4129 .4143 .4140

.4019 .4024 .4039 .4044

-3866 .3871 .3887 .3892 .3911 .3916

.3774 .3780 .3800 .3806

i

.4364 .4363 .4375 .4374

.4299 .4300 .4310 .4311

.4240 .4241 .4281 .4282 .4294 .4295

.4267 .4268 .4281 .4282

.4361 .4360 .4375 .4374 .4362 .4361 .4362 .4361 .4375 .4374

.4206 .4207 .4258 .4259 .4272 .4273

.4361 .4360 .4361 .4360 .4375 .4374

.3680 .3681 .3690 .3691

.3674 .3675 .3685 .3686

.3739 .3738 .3750 :3749 .3740 .3739 .3750 .3749

in. 0.3631 .3632 .3667 .3668 .3678 .3679

9

NOT GO

in. 0.3739 .3738 .3739 .3738 .3750 .3749

8

GO

Z Plain Cages for Major Diameter

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

.3974 .3977 .3995 .3998 .4019 .4022

.3909 .3912 .3935 .3938

.3671 .3677 .3695 .3701 .3721 -3727

.3826 .3829 .3850 .3853 .3876 .3879

-3394 .3399 .3414 .3419

in. 0.3321 .3326 .3340 .3345 .3360 .3365

7

Minor Diam.

(LO)

Threads

.3435 .3440 .3454 .3459

GO

External

.3503 .3506 .3522 .3525

.3471 .3474 .3491 .3494

in. 0.3411 .3414 .3430 .3433 .3450 .3453

6

Pitch Diam.

NOT

.3820 .3815 .3820 .3815 .3833 .3828

.3684 .3678 .3698 .3692

.3955 .3952 .3969 .3966

l-

Gages

for

.4037 .4034 .4037 .4034 .4050 .4047

.3588 .3582 .3588 .3582 .3602 .3596

.3402 .3397 .3412 .3407

.3897 .3894 .3897 .3894 .3911 .3908

.3537 .3534 .3547 .3544

.3352 .3347 .3363 .3358

in. 0.3288 .3283 -3288 .3283 .3299 .3294

in. 0.3468 .3465 .3468 .3465 .3479 -3476 .3507 .3504 .3518 .3515

5

Minor Diam.

4

Pitch Diam.

GO

X Thread

Gages

l-

.4375 .4380 .4375 .4380

.4375 .4380 .4375 .4380 .4375 .4380

.4375 .4381 .4375 .4381

.4375 .4381 .4375 .4381 -4375 .4381

.3750 .3755 .3750 .3755

.3750 .3755 .3750 .3755

in. 0.3750 .3755 .3750 .3755 .3750 .3755

10

Major Diam.

GO

.4143 .4146 .4143 .4146

.4050 .4053 .4050 .4053 .4050 .4053

.3969 .3972 .3969 .3972

.3911 .3914 .3911 .3914 .3911 .3914

.3547 .3550 .3547 .3550

.3518 .3521 .3518 .3521

in. 0.3479 .3482 .3479 .3482 .3479 .3482

11

Pitch Diam.

X Thread

Cages

.4344 .4339 .4333 .4328

.4348 .4343 .4321 .4316 .4308 .4303

.4299 .4293 .4285 .4279

.4312 .4306 .4281 .4275 .4266 .4260

.3726 .3721 .3715 .3710

.3719 .3714 .3708 .3703

in. 0.3733 .3728 .3708 .3703 .3696 .3691

12

Major Diam.

NOT

Gages

for

GO

(HI)

.3990 .3991 .3990 .3991

.3830 .3831 .3830 .3831 .3830 .3831

.4131 .4128 .4104 .4101 .4091 .4088 .4189 .4186 .4178 .4175 -. . ,---

.3700 .3701 .3700 .3701

.3600 .3601 .3600 .3601 .3600 .3601

.3410 .3411 .3410 .3411

.4028 .4025 .4014 .4011

.4003 .4000 .3972 .3969 .3957 .3954

.3591 .3588 .3580 .3577

.3564 .3561 .3553 .3550

.3360 .3361 .3360 .3361

in. 0.3300 .3301 -3300 .3301 .3300 .3301

in. 0.3553 .3550 .3528 .3525 .3516 .3513

14

GO

Z Plain Minor

Threads

13

Pitch Diam.

Internal

GAGES FOR STANDARD THREAD SERIES, CLASSES IA, 2A, 3A, IB, 2B, AND 3B UNIFIED SCREW THREADS - LIMITS OF SIZE (CONT’D) - -

‘:

--

.4070 .4069 .4051 .4050

.3950 .3949 .3950 .3949 .3916 .3915

.3840 :3839 .3800 .3799

.3760 .3759 .3760 .3759 .3717 ,3716#

.3490 .3489 .3469 .3468

.3450 .3449 .3426 .3425

in. 0.3400 .3399 .3400 .3399 .3372 .3371

15

NOT GO

Gages for Diameter

)

38

28

3B

2B

IB

3B

2B

38

2B

IB

38

2B

38

2B

3B

2B

IB

16

Class

I

n o= LL

a t .

I

UN

3A

2A

I _

3A

2,4

?A

-

3A

2A

3

-

Class

r

-

.4580 .4577.4594 ,4591

.4485 -4482 .4485 .4482 .4500 .4497

UNEF

UN

UNC

1/2-28 or 0.500-28

Yz-32 or 0.500-32

9/16-12 or 0.5625-12

1/2-20 or 0.500-20

3A

2A

1A

3A

2A

-

3A

.5068 .5065 so68 .5065 .5084 .5081

.4787 .4784 ,4797 .4794

.4757 .4754 .4768 ,4765

2A

3A

2A

.4662 .4659 .4662 .4659 ,4675 .4672

1A

.-

.5084 .5087 .5084 .5087 .5084 .5087

.5625 .5631 .5625 .5631 .5625 .5631 .5437 .5438 .5495 .5496 .5511 .5512

.4990 .4989 -5000 .4999 .5609 -5608 .5609 .5608 .5625 .5624

.4684 .4689 .4703 .4708 .4810 .4816 .4836 .4842 .4865 .4871

.4752 .4755 .4771 .4774 .4707 ,4701 .4707 .4701 .4723 .4717

.4652 .4647 .4662 .4657

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

.5547 .5541 .5513 .5507 .5496 .5490

.4977 -4972 .4966 .4961

.4797 ,4800 ,4797 .4800 .5000 .5005 .5000 .5005 .4930 .4931 .4940 .4941

.4989 .4988 .5000 .4999 .4643 .4648 -4663 .4668

.4720 .4723 .4740 .4743

.4602 .4597 .4613 .4608

.4990 .4993 .5016 .5019 .5045 .5048

.4971 .4966 .4959 .4954

.4768 .4771 .4768 .4771 -5000 .5005 .5000 .5005 .4924 .4925 .4935 .4936

.4999

.5000

.4976 .4971 .4948 .4943 .4934 .4929

,4675 ,4678 .4675 .4678 .4675 .4678

.5000 .SO05 .5000 .5005 .5000 .5005 .4865 -4866 .4906 .4907 .4919 .4920 .4987 .4986 .4987 .4986

.4490 ,4495 .4511 .4516 .4535 .4540

.4598 .4445 .4601 .4440 .4619 .4445 .4622 .4440 .4458 .4643 .4646 .4453

-

,4594 .4597 .4594 .4597 .5000 .5006 .5000 .5006

.4926 .4920 .4911 .4905

.4930 .4924 .4898 .4892 .4881 .4875

-

.4892 .4893 .4906 .4907

,5000 .5006 .5000 .5006

5006

.4500 .4503 A500 ,4503 .4500 .4503

.4460 .4459 .4419 .4418 .4570 .4569 .4570 .4569 .4537 .4536 .4700 .4699 .4676 .4675 .4740 .4739 ,4719 .4718 .4900 .4899 .4900 .4899 .4843 .4842

.4460 .4461 A60 .4461 .4460 .4461 .4610 .A611 .4610 .4611 .4660 .4661 .4660 .4661 .4720 .4721 .4720 .4721 .4720 .4721

.4759 .4756 ,4731 .4728 .4717 .4714 .4816 .4813 .4804 .4801 .4842 .4839 .4831 .4828 .5186 .5183 .5152 .5149 .5135 .5132

.4340 .4339 .4340 .4339 .4284 .4283 -4170 .4171 A170 .4171 .4170 .4171 .4320 .4321 .4320 .4321

0.4110 .4109 .4094 -4093 0.4040 .4041 .4040 .4041

In.

15

NOT GO

.4655 .4652 .4640 .4637

A597 ,4594 .4565 .4562 ,4548 .4545

.5000

.4822 .4823 .4876 .4877 .4891 .4892

.4986 .4985 .5000 .4999

.4985 .4984 .4985 .4984 .5000 .4999

-

.4398 .4404 .4424 .4430

.4245 .4251 .4269 .4275 .4297 .4303

.4533 .4536 .4559 .4562

.4309 .4303 .4323 .4317

,4411 .4152 .4414 .4146 .4435 .4152 ,4146 .4438 .4463 .4167 ,4466 .4161

En. 1,4216 .4213 ,4205 A202

in. 0.4351 .4346 .4340 -4335

In. 0.4172 .4175 M72 ,4175

in.

in.

GO

Z Plain Gages for Minor Diameter

14

I

13

Pitch Xam.

0.4375 .4380 .4375 .4380

in.

11

10

12

Major Diam.

NOT GO (HI)

--

-

Pitch Diam.

_ L

GO

Major Diam.

t

t

Gages for Internal Threads

0.4305 .4306 -4315 .4316

in. 0.4365 .4364 .4375 ,4374

In. 1.4060 .4065 .4079 .4084

In. 0.4128 .4131 .4147 -4150

in. 0.4027 .4022 .4037 .4032

in. 0.4162 .4159 .4172 .4169

8

9

GO

NOT GO

2 Plain Gages for Major Diameter

-

dinor 3iam.

7

Pitch Diam.

6

Minor Diam.

I N O T G O (LO) 5

4

Pitch Diam.

GO

X Thread Gages

Gages for External Threads

TABLE 10 GAGES FOR STANDARD THREAD SERIES,CLASSES I A l. 2A.l 3A. , IB. , 2B, . A N D 3B UNIFIED SCREW THREADS - LIMITS OFSIZE (CONT'D)

7-

716-32 or 0.4375-32

Nominal Size

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

,`,,`---

38

2B

1B

-

3B.

2B

3B

28

3B

28

1B

3B

2B

-

3B

2B

1B

-

3B

2B

16

-

Class

UN

UN

9/16-28 or 0.5625-28

9/16-32 or 0.5625-32

5/8-11

UNC

UNEF

9/16-24 or 0.5625-24

or 0.625-11

UN

9/16-20or 0.5625-20

UNF

h6-18 or 0.5625-18

2

1

UN

Series Designation

9/16-16 or 0.5625-16

__

) @

-

3A

2A

1A

3h

2A

-

3A

2A

-

3A

2A

-

3A

2A

-

3A

2A

1A

3A

2A

3 -

Class

T

In.

in.

.5644 .5641 .5644 .5641 .5660 .5657

5 4 12 .5409 .5422 .5419

.5382 .5379 .5393 .5390

.5342 .5339 .5354 .5351

5287 .5284 .5300 .5297

.5250 .5247 ,5250 .5247 .5264 .5261

T

.5561 .5564 .5589 .5592 .5619 .5622

-5377 .5380 .5396 .5399

.5345 .5348 .5365 .5368

.5303 .5306 .5325 .5328

.5245 ,5248 .5268 ,5271

.5182 .SI85 .5205 .5208 .5230 .5233

0.5158 .SI61 .si84 .SI87

in.

6

Pitch Diam.

1

.5364 .5370 .5392 .5398 .5422 .5428

.5309 .5314 .5328 .5333

.5268 -5273 .5288 .5293

.5213 .5218 .5235 .5240 .5614 -5613 .5625 .5624

.5613 .5612 .5625 .5624

.5612 .5611 .5625 .5624

.5611 .5610 .5611 .5610 .5625 :5624

0.5611 .5610 .5625 -5624

in.

8

GO

.5561

.5550 -5560

.5549

.5541 .5542 .5553 .5554

.5531 .5532 .5544 .5545

.5481 .5524 .5525 .5538 .5539

.5480

0.5517 .5518 .5531 .5532

in.

9

,GO

NOT

Major Diameter

t

5052 .6053 .6113 &I14 5129 5130

.5566

.5555 -5556 .5565

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

.6234 .6233 6234 .6233 5250 .6249

.5615 .5614 .5625 .5624

."

" "

"

.5137 .SI42 .SI60 .SI65

.SO62 .SO67 .SO85 .SO90 .5110 .SI15

0.5023 .SO29 .SO49 .5055

in.

7

Minor Diam.

NOT G O (LO)

T

T Z Plain Gages fort

" " "

.5250 .5244 .5250 .5244 .5266 .5260

.5287 .5282

.5272

.5277

.5227 ,5222 .5238 .5233

.5162 .SI57 .SI74 .5169

.5083 .SO78

.SO65

.5070

.SO09 .5004 .SO23 .SO18

.SO04

.SO09

0.4934 .4928 .4948 .4942

5

4 0.5205 .5202 -5219 .5216

Minor Diam.

Pitch Diam.

GO

X Thread Gages

Gages for External Threads

.6250 A256 A250 5256 .6250 .6256

.5625 .5630 .5625 .5630

.5625 .5630 .5625 .5630

,5625 .5630 .5625 .5630

.5625 .5630 .5625 .5630

.5625 .5630 .5625 .5630 .5625 .5630

0.5625 .5631 .5625 .5631

In.

10

Major Diam.

" "

.5663

.5660

.5660 .5663 .5660 .5663

.5422 .5425 .5422 .5425

-5393 .5396 .5393 .5396

.5354 .5357 -5354 .5357

.5300 .5303 .5300 .5303

.5264 .5267 .5264 .5267 .5264 .5267

0.5219 .5222 .5219 ,5222

in.

11

-

Pitch Diam.

I _

GO

5161 .6155 .6126 5120 6108 5102

.5602 .5597 ,5591 .5586

.5596 .5591 .5584 .5579

.5585 .5580 .5572 .5567

.5572 .5567 .5558 -5553

.5594 .5589 .5564 .5559 .5549 .5544

-5530

0.5551 .5545 -5536

in.

12

Major Diam.

.5767

.5467 .5464 .5456 .5453

.5441 .543a .5429 .5426

-5405 .5402 .5392 .5389

.5355 .5352 .5341 -5338

in.

15

GO

NOT

.5270

.5290 .5291

.5290 .5291

-5240 -5241 .5240 .5241

.SI70 .5171 .SI70 .SI71

SO80 ,5081 .SO80 .SO81

.5460 .5459 .5460 .5459 .5391 .5390

.5360 .5359 .5344 .5343

.5320 .5319 .5301 .5300

.5270 .5269 .5244 .5243

.5200 .5199 .5162 .5161

.SI50 .SI49 .SI50 .5149 .5106 .SI05

0,4950 0.5090 .4951 .5089 .4950 .5040 .4951 .5262.SO39

in.

14

.5353 .5020 .5350 ,5021 -5323 ,5020 .5320 .5027 .5308 .SO20 .5305 .5021

0.5280 -5277 .5265

in.

13

Pitch

Z Plain Gages for Minor Diameter

x

NOT GO (HI)

X Thread Gages

Gages for Internal Threads

TABLE 10 GAGES FOR STANDARD THREAD SERIES,CLASSES IA, 2Ay 3A, lB, 2B, A N D 3B UNIFIED SCREW THREADS - LIMITS O F SIZE (CONT'D)

Nominal Size and Threads/in.

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

5

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

-

38

28

1B

-

38

28

38

28

38

28

38

28

-

3B

28

16

3B

28

16

Class -

i

-

UNEF

UN

UN

78-24 or 0.625-24

s/B-28 or 0.625-28

%-32

or 0.6875-12

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

lh-12

UN

$43-20 or 0.625-20

or 0.625-32

UNF

or 0.625-18

%-I8

UN

UN

or 0.625-16

ye-16

UN

or 0.625-12

2

Series Designation

%-I2

1

Nominal Size and Threads/in.

r

_---

3A

2A

3A

.6318 .6315 .6334 .6331

-6036 .6033 .6047 .6044

2A

3A

.6007 .6004 .6018 .6015

.5967 .5964 .5979 .5976

2A

3A

2A

3A

2A

3A

2A

.5912 .5909 .5925 .5922

S875 .5872 .5875 .5872 .5889 .5886

IA

3A

.5830 .5827 .5844 .5841

2A

.5706

.5709

.5957 .5951 .5973 .5967

GO

Z Plain Gages for Major Diameter

.6084 .6090 .6113 .6119

.5932 .5937 .5952 .5957

.5892 .5897 .5913 .5918

.5837 5842 .5859 .5864

.5761 .5766 .5785 .5790

.5685 .5690 .5708 .5713 .5734 .5739

.5647 .5653 .5673 .5679

in. 0.5459 .5465 .5488 .5494

7

.6859 .6858 .6875 .6874

.6239 .6238 .6250 .6249

.6745 .6746 .6761 .6762

.6179 .6180 .6190 .6191

-6174 .6175 .6185 -6186

.6166 .6167 .6178 .6179

.6238 .6237 .6250 .6249 .6239 .6238 .6250 .6249

.6156 .6157 .6169 .6170

.6334 .6337 .6334 .6337

.6875 .6881 .6875 .6881

.601E .6021 .6018 .6021

.5979 .5982 .5979 .5982

.5925 .5928 .5925 .592f?

.5889 .5892 .5889 .5892 .5889 .5892

.5844 .5847 .5844 .5847

in. 0.5709 .5712 .5709 .5712

11

Pitch Diam.

.6047 .6050 .6047 .6050

GO

X Thread -I-

Gages

.6250 .6255 .6250 .6255

.6250 .6255 .6250 .6255

.6250 .6255 .6250 .6255

.6250 .6255 .6250 .6255

.6250 .6255 .6250 .6255 .6250 .6255

.6250 .6256 .6250 .6256

.6142 .6143 .6156 .6157 .6105 .6106 .6149 .6150 .6163 .6164

in. 0.6250 .6256 .6250 .6256

10

Major Diam.

in. 0.6120 .6121 .6136 .6137

9

.6237 .6236 .6250 .6249

.6236 .6235 .6236 .6235 .6250 .6249

.6236 .6235 .6250 .6249

in. 0.6234 .6233 a6250 96249

a

GO

.-

NOT GO

Diam.

T

Threads

Minor

(LO)

External

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

.6264 .6267 .6293 .6296

.6000 .6003 .6020 .6023

.5969 .5972 .5990 .5993

.5852 .5847 .5863 -5858 .5901 .5896 .5912 .5907

.5927 .5930 .5949 .5952

.5869 .5872 .5893 .5896

.5805 .5808 .5828 -5831 .5854 .5857

.5782 ,5785 .5808 .5811

.5787 -5782 .5799 .5794

.5695 .5690 .5708 .5703

-5634 .5629 .5634 .5629 .5648 .5643

.5559 .5553 .5573 .5567

in. 0.5639 .5642 .5668 .5671

iti. 0.5332 -5326 .5348 .5342

in, 0.5693 .5690

2A 3A

6

5

Pitch Diam.

NOT

4

l-

Gages

3

GO

X Thread

for

Minor Diam.

r:

Gages

.6766 .6760 .6748 .6742

.6228 .6223 .6217 -6212

-6222 .6217 .6210 .6205

,621l .6206 -6198 .6193

.6198 .6193 .6184 .6179

.6221 .6216 .6190 .6185 -6175 .6170

.6177 .6171 .6161 .6155

in. 0.6141 .6135 .6123 .6117

12

Major Diam.

NOT

Gages

for

GO

(HI)

.6405 .6402 .6387 .6384

.6079

.6093 .6090

.6067 .6064 .6055 -6052

.6031 .6028 .601E -6015

.5964

.5967

.5981 -5978

-5934 .5931

.5949 .5946

.5980 -5977

3906 ,5903 .5890

.5970 .5971 .5970 .5971

.5910 .5911 .5910 .5911

.5860 .5861 .5860 .5861

-5800 .5801 .5800 .5801

.5710 .5711 .5710 .5711

.5650 .5651 ,565O .5651 .5650 .5651

.5650 .5571 .5570 .5571

in. 0.5350 -5351 .5350 -5351

14

GO

.6150 .6149 .6085 .6084

.5990 .5989 .5969 .5968

.5950 -5949 .5926 .5925

.5900 .5899 .5869 .5868

.5820 .5819 .5787 .5786

.5780 .5779 .5780 .5779 .5730 .5729

.5710 .5709 .5662 .5661

in. 0.5530 .5529 .5463 .5462

15

NOT GO

Z Plain Gages for Minor Diameter

Threads

in. 0.5780 .571? .5762 skis

i3

Pitch

Internal

GAGES FOR STANDARD THREAD SERIES, CLASSES IA, 2A, 3A, lB, 2B, AND 3B UNIFtED SCREW THREADS - LIMITS OF StZE (CONT’D)

Pitch Diam.

Class

TABLE 10

T

38

28

38

2B

38

28

3B

28

3B

2B

38

2B

IB

38

2B

38

28

16

Class

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

74-16 or 0.750-16

UN

I 3A

I 2A

.7004 .7007 .7029 .7032 .7056 .7059

5808 .6802 5808 .ti802 A823 , A817 .7079 .7076 .7079 .7076 .7094 .7091

.6869 .6875 .6894 A900 .6921 5927

A707 .6713 -6738 .6744

.7343 .7344 .7391 .7392 .7406 .7407

.7485 .7484 .7485 .7484 .7500 .7499

.7500 -7506 .7500 .7506 .7500 .7506

.7500 .7506 .7500 .7506

.7500 .7506 .7500 .7506 .7500 .7506

.7288 .7289 -7353 .7354 .7371 .7372 .7369 .7370 -7386 .7387

.6875 .6880 5875 5880

5804 .6805 -6815 .6816

.6875 .6880 .6875 .6880

.6875 -6880 -6875 -6880

in. 0.6875 5881 A875 -6881

10

.7094 .7097 .7094 .7097 .7094 .7097

.6959 A962 A959 .6962

6850 .6853 .6850 A853 .6850 5853

5672 6675 .6672 .6675

.6643 5646 .6643 6,646

.6604 .6607 6604 5607

.6550 ,6553 .6550 .6553

in, 0.6469 .6472 ,6469 ,6472

11

-

-

-7463 .7457 .7430 .7424 .7414 .7408

.7392 .7386 .7374 .T368

.7398 .7392 .7360 .7354 ,7340 .7334

,6853 .6848 .6842 5837

.6847 .6842 5835 .6830

.6836 5831 5823 .6818

,6823 .6818 ,6809 .6804

in. 0.6802 .6796 .6786 ,6780

12

Major Diam.

-

.7192 .7189 .7159 .7156 .7143 .7140

.7031 .7028 .7013 .7010

.6965 5962 .6927 .6924 .6907 .6904

5718 5715 .6707 .6704

.6692 6689 .6680 A677

.6643 ..6640

6653

.6656

6606 5603 .6592 .6589

.6528 .6515 5512

In.

NOT GO (HI)

'

I

.6820 .6821 .6820 .6821 5820 .6821

.6600 G01

-6601

.GOO

5420 5421 .6420 A421 5420 .6421

.6540 .6541 5540 A541

.6490 .6491 .6490 ,6491

.6420 5421 .6420 .6421

5330 A331 .6330 5331

3201 5200 ,6201

in.

A960 .6959 .6960 .6959 ,6908 .6907

A780 6779 A707 .6706

-6630 .6629 .6630 .6629 A545 6544

.6610 A609 .6594 .6593

5570 6569 A551 -6550

.6520 .6519 5494 5493

.6450 .6449 5412 .6411

in. 0.6340 .6339 .6284 .6283

15

NOT GO

Z Plain Cages for Minor Diameter

Gages for Internal Threads

Pitch Diam.

GO Major Diam.

.6875 .6880 .6875 5880

ft

.6799 .6800 .6810 .6811

.6791 5792 .6803 .6804

.7483 .7482 .7500 .7499

.7482 .7481 .7482 .7481 .7500 -7499

A864 6863 .6875 -6874

.6864 .6863 .6875 A874

A863 5862 .6875 .6874

,6862 .6861 .6875 ,6874

-6875 .6874 .6781 5782 .6794 6795

in. 0.6767 .6768 ,6781 5782

in. 0.6861 ,6860

9

NOT GO

8

GO

Major Diameter

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

5887 .6890 .6918 .6921

A581 6575 .6598 5592

-6942 .6939 .6959 .6956

.6528 .6534 .6557 5563 -6590 .6596

5744 .6747 .6773 6776 .6806 .6809

.6399 .6393 .6399 -6393 .6417 .6411

.6832 .6829 .6832 5829 5850 .6847

%-IO or 0.750-10

$2-12 or 0.750-12

5557 A562 A577 .6582

6625 -6628 .6645 ,6648

.ti517 .6522 .6538 .6543

A462 .6467 .6484 -6489

.6386 .6397 .6410 .6415

6526 5521 .6537 -6532

.6552 .6555 .6574 5577

.6494 5497 .6518 5521

,6661 ,6658 5672 .6669

.6412 .6407 A424 ,6419

-6320 .6315 .6333 .6328

in. 0.6272 .627a 5298 .6304

ll/16-32 or 0.6875-32

2A

.6592 .6589 .6604 .6601

-6537 5534 A550 .6547

in. 0.6407 6410 .6433 .6436

7

6594 5597 .6615 5618

I

2A

2A

in. 0.6184 .6178 A198 .6192

In. 0.6455 A452 6469 .6466

6

1

TZ Plain Gages for -

Minor Diam.

5477 .6472 .6488 5483

UN

I

I

3A

2A

5

4

Pitch Diam.

NOT GO (LO)

.6632 .6629 5643 ,6640

lYi6-28 or 0.6875-28

~

UNEF

UN

1Y16-20 or 0.6875-20

1yi6-24 or 0.6875-24

UN

Minor Diam.

T

X Thread Gages

Gages for External Threads

Diam.

Pitch

+

Series Designation Class

11/6-16 or 0.6875-16

1

Nominal Size and Threads/in.

t-

t

r

TABLE 10 GAGES FOR STANDARD THREAD SERIES,CLASSES I A , 2A, 3A, IB, 2B, AND 3B UNIFIED SCREW THREADS- LlMlTS OF SIZE (CONT'D)

I

-

3B

2B

1B

-

3B

2B

-

3B

2B

1B

36

28

3B

2B

3B

28

38

28

-

3B

28

16

Class

or 0.8125-20

or 0.8125-28

or 0.8125-32

1%20

'3/16-28

'716-32

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

or 0.8125-16

%.s-16

or 0.750-32

h-32

or 0.8125-12

or 0.750-28

Y+28

'?%-I2

or 0.750-20

1

Threads/in.

Size

74-20

and

Nominal

UN

UN

UNEF

UN

UN

UN

UN

UNEF

2

Series Designation

I

r

in. 0.6945 .6940

in. 0.7162 .7159 .7175 .7172

3A

2A

3A

2A

3A

.7782

.7919

>

.7776 .7771 .7787

.7733

.7890 .7911 .7908 .7922

.7726 .7721 .7738

-7881 .7878 .7893

.7.578

.7797

.7807 .7872 .7827 .7832

.7766 .7771 .7787 .7792

.7635 .7640 .7659 -7664

.7520 .7526 .7548 .7554

.7369

.8060 .8061 .8054 .8055 .8065 .8066

.8125 .8124 .8114 .8113 .8125 .8124

.8048 .8049

.8044 .8045

.8125 .8124 .8113 .8112

.8031 .8032

.8112 ,871l

.8016 .8017

.8011 .8012

.7994 .7995

.7441

.7429 .7430 .7440

.8031 .8032

--

.7436

.7423 .7424 .7435

.7420

.8109 .8125 .8124

.8110

.8108 .8107 18125 .8124

.7499

.7489 .7488 .7500

.7499

.7488 .7487 .7500

.7500 .7499

0.7406 .7407 .7419

in.

9

NOT GO

Gages for Diameter

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

.7875 .7878 .7895 .7898

.7867

.7843 -7846 .7864

,777o

.7743 .7746 .7767

.7686

.7442 .7570 .7565 .7583

.7719 .7716

3A

.7655 .7658 .7683

.7433 .7427 .7448

.7546

.7217

.7207

.7273 .7332 .7338 .7363

.7182 .7187 .7202

-7162 .7167

.7141 .7146

.7034 .7039

.7250 .7253 .7270

.7242

.7218 .7221 .7239

.7142 .7145

0.7487 .7486

in.

in. 0.7010 .7015

in. 0.7118 .7121

8

7

6

(LO)

Z Plain Major

Threads

GO

GO

External

Minor Diam.

Pitch Diam.

.7512 .7515 .7543

L

NOT

Gages

for

.7206 .7200 .7223

.7162 .7157

-7787 .7784 .7800

.7704 .7701

.7584 .7581

3A

2A

.7567 .7564

3A

2A

.7283 .7297 .7294

.7151 .7146

3A

.7286

.7096 .7113 .7108

2A

.7101

.72.53 .7268 .7265

.6953

5

Minor Diam.

4

Pitch Diam.

GO

--

Gages X Thread

.7256

2A

.)

r

--

.8125 .8130

.8125 .8130

.7922 .7925 .7922 .7925

.7893 .7896

.7893 .7896

.8125 .8130 .8125 .8130

.7803

.8130

.7719 .7722

.7719 .7722

.7584 .7587 .7584 .7587

.7300

.7297 .7300 .7297

.7271

.7268 .7271 .7268

.7178

0.7175 .7178 .7175

in.

11

Pitch Diam.

.7800 .7803 .7800

GO

for

.8104 .8099 .8093 .8088

.8085 .8080

.8098 .8093

.8060 .8055

.8074 .8069

.8037 .8031

.8053 .8047

.8017 .8011 .7999 .7993

.7463

.7479 .7474 .7468

.7455

.7473 .7468 .7460

.7430

0.7449 .7444 .7435

in.

12

Major Diam.

NOT

Gages

1-

X Thread

.8125 .8130 .8125

.8131

.8125 .8131 .8125

.8131

.8125 .8131 .8125

.7500 .7505 .7500 .7505

.7505

.7500 .7505 .7500

.7505

0.7500 .7505 .7500

in.

10

Major Diam.

,, F Gages

GO

) .,”

.7955

.7969 .7966 .7958

.7930 .7927

.7943 .7940

.7840

.7857 .7854 .7843

.7766 .7763

.7782 .7779

.7656 .7653 .7638 .7635

.7330

.7344 .7341 .7333

.7302

.7318 .7315 .7305

.7215

.7790 .7791 .7790 .7791

.7741

7740 .7741 .7740

.7581

.7580 .7581 .7580

.7450 .7451

.7450 .7451

.7220 .7221 .7220 .7221

.7161

.7160 .7161 .7160

.7111

.7110 .7111 .7110

.6960 .6961

0.6960 .6961

in.

14

GO

Z Plain Minor

Threads

0.7232 .7229 .7218

in.

13

Pitch Diam.

(HI)

Internal

GAGES FOR STANDARD THREAD SERIES, CLASSES IA, 2A, 3A, lB, ZB, AND 3B UNIFIED SCREW THREADS - LIMITS OF SIZE (CONT’D)

2A

3A

2A

3

Class

TABLE IO

)

.7844 .7843

.7860 .7859

.7800

.7820 .7819 .78O'l

-7661

-7700 .7699 .7662

.7532

.7590 .7589 .7533

.7400 .7399 .7329 .7328

.7218

.7240 .7239 .7219

.7175

.7200 .7199 .7176

.7037 .7036

0.7070 .7069

in.

15

NOT GO

Gages for Diameter

../

38

28

3B

2B

3B

2B

38

2B

38

28

3B

28

3B

2B

38

2B

16

Class

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

UN

UNEF

UN

UN

UN

78-16 or 0.875-16

78-20 or 0.875-20

78-28 or 0.875-28

78-32 or 0.875-32

l5/,6-12 or 0.9375-12

2A

3A

2A

3A

2A

3A

2A

3A

2A

-

3A

2A

1A

3A

2A

3A

2A

1A

3

-

-

Class

In.

.8817 .8814 .8834 .8831

.8536 .8533 .8547 .8544

.8506 .8503 .8518 .8515

.8412 .8409 .8425 .8422

.8329 .8326 .8344 .8341

.8270 .8267 .8270 .8267 .8286 .8283

.8192 .8189 .8209 .8206

.8456 .8450 .8473 .8467 3A

..

-

.8401 .8396 .8412 .8407

.8351 .8346 .8363 .8358

.8195 .8190 .8208 .8203

.8058 .8052 -8073 .8067

.7961 .7955 .7961 .7955 .7977 .7971

.7831 .7825 .7848 .7842

0.7528 .7521 .7528 .7521 .7547 .7540

in.

0.8009 .8006 .8009 .8006 .8028 .8025

5

Minor Diam.

4

Pitch Diam.

GO

-

.8760 .8763 .8792 .8795

.8500 .8503 .8520 .8523

.8468 .8471 .8489 .8492

.8368 .8371 .8392 .8395

.8280 .8283 .8308 .8311

.8189 .8192 .8216 .8219 -8245 .8248

.8137 .8140 .8168 -8171

0.7914 .7917 .7946 .7949 .7981 .7984

in.

6

Pitch Diam.

.8580 .8586 -8612 .8618 .. .

.8432 .8437 .'8452 .8457

.8391 .8396 -8412 .8417

.8260 .8265 .8284 .8289

.8145 .8151 .8173 .8179

.8034 .8040 .8061 .8067 .8090 .8096

.7957 .7963 .7388 .7994

0.7673 -7680 .7705 .7712 -7740 .7747

in.

7

Minor Diam.

-

,93580 .93568 .93750 .93738

.87390 .87378 .87500 m 8 a

.87380 .87368 .87500 .87488

.87370 .87358 .87500 .87488

.87350 .87338 .87500 .87488

.87340 .8732a .m40 .87328 .87500 .87488

.8733C .8731E .8750C .87488

0.8731( .87291 .8731( .8729t .8750( .8748t

in.

8

GO

-

1

.92440 .92452 .92610 .92622

.86790 .86802 .86900 .86912

.86730 .86742 .86850 .86862

.86560 .86572 .86690 .86702

.86410 .86422 .86560 .86572

.85790 .85802 .86310 .86322 .86470 .86482

.86190 .86202 .86360 .86372

0.85230 A5242 .859211 -85932 .8611a .86122

in.

9

NOT GO

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

"

T NOT GO (LO)

T

Plain Gages for Major Diameter

TL

Gages for External Threads X Thread Gages

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

- -.

UNF

78-14 or 0.875-14

".

UN

78-12 or 0.875-12

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

UNC

2

1

78-9 or .875-9

Series Designation

Nominal Size and Threads/in.

t

t

T

-

.9375 .9381 .9375 .9381

.8750 .8755 .8750 .8755

.8750 .8755 .8750 -8755

.8750 .8755 .8750 .8755

.8750 .8756 .8750 -8756

.8750 .8756 .8750 .8756 .8750 .8756

-8750 .8756 .8750 .8756

0.8750 .8757 .8750 3757 -8750 .8757

In.

10

Major Diam.

.9269 .9263 .9250 .9244

.8729 .8724 .8718 .8713

.8723 .8718 .8710 ,8705

.8699 -8694 .8685 .8680

.8678 -8672 -8662 .8656

.8701 .8695 .8665 .8659 .8648 .8642

.8642 .8636 .8624 .8618

0.8632 .8625 .8591 .8584 .8570 .8563

in.

Major Diam.

t

-

.8908 .8905 .8889 .8886

-

.8594 .8591 .8583 .8580

-

.8568 .8565 .8555 .8552

-

-8482 .8479 .8468 -8465

-

.8407 .8404 .8391 ,8388

-

.8392 3389 .8356 A353 .8339 .8336

-

.8281 -8278 .8263 .8260

-

0.8151 .a148 .8110 .8107 .8089 .8086

in.

Pitch Diam.

-

NOT CO (HI)

.84700 .84712 .84700 .84712

.84100 .84112 .84100 .84112

.a3600 .83612 .83600 .83612

.82100 .82112 .82100 .82112

.80700 .80712 .80700 .80712

.79800 .79812 .79800 .79812 .79800 .79812

-78500 .78512 .78500 78512

0.75500 .75512 .75500 .75512 .75500 ,75512

in.

14

GO

.86500 .86488 .85750 .85738

.84900 .84888 .84690 .84678

-84500 .84488 .84260 .84248

.83200 .83188 .82870 .82858

.82100 .82088 .81580 .81568

.81400 .81388 .81400 31388 .80680 .80668

.80300 .80288 .79520 .79508

0.77800 .77788 .77800 .77788 .76810 .76798

in.

15

GO

NOT

Minor Diameter

T 2 Plain Gages for

12 13 --

T

"

.8834 .8837 .8834 .8837

.8547 .8550 .8547 .8550

.8518 .8521 .8518 .8521

.8425 .8428 .8425 B428

.8344 .8347 .8344 .8347

.8286 .8289 .8286 .8289 .8286 .8289

.8209 .8212 .8209 .8212

0.8028 .8031 -8028 .8031 .8028 .8031

In.

11

Pitch Diam.

GO

X Thread Gages

Gages for Internal Threads

TABLE 10 GAGES FOR STANDARD THREAD SERIES,CLASSES IA, ZA,3A, IB, 2B, AND 3B UNIFIED SCREW THREADS LIMITS OF SIZE (CONT'D)

38

26

3B

28

3B

28

3B

2B

-

38

2B

38

2B

1B

38

2B

38

28

1B

16

-

Class

i

~~

I

1 I

I

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

1-16 or 1.000-16

~

1-8 or 1.000-8

15/16-32 or 0.9375-32

l716-28or 0.9375-28

15/16-20or 0.9375-20

1

I

I

I1

3A

2A

1A

3A

2A

3A

2A

in.

.9080 .9074 .9080 .9074 .9098 .9092

-9441 .9438 .9441 .9438 .9459 .9456 .9308 .9302 .9323 .9317

.8627 .8620 .8627 .8620 .8647 .8640

.9168 .9164 .9168 .9164 .9188 .9184

.9579 .9576 .9594 .9591

.9123 .9126 .9144 .9147

.9026 .9021 .9037 .9032

.9161 .9158 .9172 .9169

.9394 .9400 .9422 .9428

.9173 .9179 .9202 .9208 .9235 .9241

.8796 .8803 .8829 .8836 .8866 .8873

.9055 -9060 .9076 .9081

.9014 .9019 .9036 .9041

.8883 .8888 .8908 .8913

0.8769 .8775 .8797 .8803

in.

7

Minor Diam.

In.

In.

.9930 .9924 .9914 .9908 1.0000 1.0006 1.0000 1.0006

.9594 .9597 .9594 .9597 .99850 .99838 1.00000 .99988

.98910 .98922 .99060 .99072

.9934 .9928 .9896 ,9890 .9877 .9871 .9459 .9462 -9459 .9462 .9459 .9462

1.0000 1.0006 1 .oooo 1.0006 1 .oooo 1.0006 .98100 .98112 .98680 .98692 .98860 .98872 .99820 .99808 .99820 .99808 1.00000 .99988

1 .OOOOO .99988

.9188 -9192 -9188 .9192 .9188 .9192

1 .oooo 1.0007 1 .oooo 1.0007 1 .oooo 1.0007 .97550 .97562 .98300 .98312 -98500 .98512 .99800 .99788 .99800 .99788

.9861 .9854 .9817 .9810 .9795 3788

.9356 ,9351 .9344 .9339 .9172 -9175 .9172 .9175

.9375 .9380 .9375 .9380 .93040 .93052 .93150 .93162

.9350 .9345 -9337 .9332

.9326 .9321 .9311 .9306

.93640 .93628 .93750 .93738

.9050 .9053 .9050 .9053

-

.9143 .9146 .9143 .9146

.9375 .9380 .9375 .9380

in.

0.9305 -9299 .9289 .9283

in.

11.8969 .a972 .8969 .8972

,9375 .9380 .9375 .9380

-92800 .92812 .92940 .92952

12

11

-

.9659 .9656 .9643 .9640

-

.9573 .9570 .9535 .9532 .9516 .9513

-

.9320 .9316 .9276 .9272 .9254 .9250

-

.9221 .9218 .9209 .9206

-

.9195 .9192 .9182 .9179

-

.9109 .9106 .9094 .go91

-

0.9034 .9031 .9018 .9015

In.

13

-

Pitch Diam.

--

Major Diam.

.92980 .92992 -93100 .93112

.93630 .93618 .93750 .93738

.93610 ,93598 .93750 .93738

0.9375 .9381 .9375 .9381

10

Pitch Diam.

NOT GO (HI)

for

in.

14

CO

In.

15

GO

NOT

Minor Diameter

.93200 .93212 .93200 .93212

.91000 .91012 .91000 ,91012 .91000 .91012

.86500 .86512 .a6500 .86512 .86500 .86512

.go400 .go412 .go400 .go412

.899OO .89912 .89900 .89912

.88300 .88312 .88300 .88312

Class

.94600 .94588 .94080 .94068

.92800 .92788 .92800 .927a8 .91980 .91968

.89000 .88988 .89000 -88988 .87970 .87958

.91100 .91088 .go940 .go928

.go700 .go688 .go510 .go498

38

ZB

-

3B

2B

1B

3B

28

18

-

3B

28

-

3B

28

-

-

3B

2B

16 -

T

.89500 2B .89488 89120 38 891 08

0.87000 0.88400 .87012 .88388 -87000 .87830 .87012 .87818

- -1

TZ Plain Gages

Gages for internal TlIreads X Thread Gages GO

Major Diam.

9

GO

NOT

tt

0.93600 0.92660 .92672 .93588 -93750 .92810 -93738 .92822

in.

a

GO

Z Plain Gages for

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

.9529 .9532 .9557 .9560

.9353 .9356 .9382 .9385 .9415 .9418

.9067 ,9071 .9100 .9104 .9137 .9141

.go91 .9094 .9113 .9116

.8991 .8994 .BO16 .go19

.8976 .8971 .8988 .8983

,8819 .8814 .8833 .8828

0.8904 .8907 .8932 .8935

in.

6

Pitch Diam.

.9131 .9128 .9143 .9140

.9036 -9033 .9050 .9047

0.8683 .8677 .8698 .8692

in.

0.8954 .8951 .8969 .8966

5

Minor Diam.

GO

X Thread Gages

4

Pitch Diam.

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

UN

UNC

UN

UNEF

2A

UN

15/16-16or 0.9375-16 3A

3

2

1

~

Nominal Size

I

I TGages for External Threads

TABLE 10 GAGES FOR STANDARD THREAD SERIES,CLASSES I A , 2A, 3A, l B , 2B, A N D 3B UNIFIED SCREW THREADS - LIMITS O F SIZE (CONT'D)

3

_"

_"

UN

l1/16-20 or 1.0625-20

-.

UNEF

1l/16-18 or 1.0625-1 8

1.0283 1.0300 1.0297

1.0261

1.0247

1.0216

1.0241 1.0244 1.0266 1.0269

-

1.06080 1.06068 1.06250 1.06238

1.06050 1.06038 1.06250 1.06238

.99890 .99878 1.ooooo .99988

.99880 ,99868 1.ooooo ,99988

0.99860 .99848 1.ooooo .99988

in.

8

GO

-.

1.0133 1.01 38 I.0158 1.0163

1.0083 1.0088 1.01 08 1.0113

1.OS452 - .- "- .

1.05300 1.05312 1.05440

1.OS240 1.05252 1,05380 1.05392

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

-

1.06110 1.06098 1.06250 1.06238

1.06110 1.06098 1.06250 1.06238

1.051 60 1.05172 1.05310 1.OS322

1.04940 1.04952 1.05110 1.05122

1.04550 1.04562 1.04750 1.04762

.99290 .99302 .99400 .99412

.99230 .99242 .99350 .99362

Major Diam.

GO

,9797 .9800 .9797 .9800

1.oooo 1.0005 1.oooo 1.0005

" "

1.0625 1.0630 1.0625 1.0630

1.0625 1.0630 1.0625 1.0630

1J625 1.0631 1.0625 1.0631

1.0625 1.0631 1.0625 1.0631

"

1.0300 1.0303 1.0300 1.0303

1.0264 1.0267 1.0264 1.0267

1.0219 1.0222 1.021 9 1.0222

1.0084 1.0007 1.0084 1.0087

.9813 .9817 .9813 .9817

,9768 .9771 .9768 .9771

1.oooo 1.0005 1.oooo 1.0005

1.0625 1.0632 1.0625 1.0632

0.9675 .9678 .9675 .9678

in.

11

1.0000 1.0005 1.0000 1.0005

rn.

"

10

for Gages

Pitch Diam.

"

t

t

T

0.99050 .99062 .99190 .99202

in.

9

GO

NOT

Major Diameter

Z Plain Gages for

1.001 9 1.061 00 1.0025 1.06088 1.0047 1.06250 1.0053 1.06238

.9830 .9836 .9862 .9868

.9454 .9461 .9491 .9498

.9680 .9685 .9701 .9706

.9639 .9644 .9661 .9666

0.9508 .9513 .9533 -9538

in. in.

7

Minor Diarn.

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

1.0069 1.0064 1.0083 1.0078

1.0009 1.0203 1.0004 1.0206 1.0023 1.0228 1.001 8 1.0231

.9933 1,0154 .9927 1.0157 .9948 1.01 82 1.0185 .9942

UN

11/16-16 or 1.0625-16 1.0201

1.0010 .9706 1.0013 .9700 .9723 1.0042 .9717 1.0045

UN

.9748 .9751 .9769 .9772

.9716 .9719 .9738 .9741

11/16-12 or 1,0625-12

.9651 .9646 .9662 .9657

.9601 .9596 .9613 .9608

0.9444 0.9616 .9439 .9619 .9458 .9641 .9453 .9644

in.

6

Pitch Diam.

NOTGO(L0)

.9252 .9725 .9245 .9729 .9272 .9762 .9265 , .9766 1.0067 1.0064 1.0084

.9756 .9753 .9768 .9765

0.9661 .9658 .9675 .9672

in.

5

4

I

I

UN

1.0286 2A

3A

2A

-t Minor Diam.

Pitch Diarn.

GO

X Thread Gages

Gages for External Threads

11/16-8 or 1.0625-8

UN

1-32 or 1.000-32

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

VI W

UN

1-28 or 1.000-28

3A

2A

3

2

UNEF

Class

Series Designation

1-20 or 1.000-20

Nominal Size and Threads/in.

I

I internal Threads

TABLE 10 GAGES FOR STANDARD THREAD SERIES,CLASSES IA, 2A, 3A, IB, 2B, AND 3B UNIFIED SCREW THREADS - LIMITS O F SIZE (CONT'D)

1.02000 1.01 988 3B 1.01620 1.01608

1.01500 1.01488 3ß 1.01050 1.01038

1.00900 1.00888 1.00330 1.0031 8

.99000 .98988 .98230 .98218

-95200 .95188 .94220 .94208

.97400 .97388 .97190 .97178

.97000 .96988 .96760 .96748

0.95700 .95688 .95370 .95358

in.

15

NOT GO

Z Plain Gages for

I

2B

"

26

36

26

36

26

36

26

36

26

36

26

36

26

16

Class

VI

UNC

1%-7 or 1.125-7

UN

UNF

UN

UNEF

UN

1%-8 or 1.125-8

11/8-12or 1.125-12

1%-16 or 1.125-16

1%-18 or 1.125-18

11/8-20or 1.125-20

1.0911 1.0908 1.0925 1.0922

2A 3A

3A

1.0875 1.0872 1.0889 1.0886

1.0829 1.0826 1.0844 1.0841

1.0691 1.0688 1.0691 1.0688 1.0709 1 .b706

1.0417 1.0413 1.0438 1.0434

1.0300 1.0296 1.0300 1.0296 1.0322 1.0318

2A

3A

2A

3A

2A

1A

3A

2A

3A

2A

1A

'

in.

2A

UN

1 Yl6-28 or 1.0625-28

3A

in.

4

3

2

1

1.0264 1.0269 1.0286 1.0291

in.

7

Minor Diam.

1.1192 1.1187 1.1176 1 .I 171 1.1201 1.1196 1.1186 1.1181

1 .I 2501.0889 1.1255 1.0892 1 .I 250 1.0889 1 .I 2551.0892 1 .I 2501.0925 1 .I 2551.0928 1 .I 2501.0925 1.1255 1.0928

1 .I 2360 1.11490 1 .I 23481.11502 1 .I 2500 1.11630 1 .I 24881.11642 1.12360 1.11550 1 .I 23481.11562 1.12500 1.11690 1 .I 2488 1.11702

1.0708 1.071 3 1.0733 1.0738 1.0758 1.0763 1.0783 1.0788

1.0828 1.0831 1.0853 1.0856 1.0866 1.0869 1.0891 1.0894

1.0694 1.0689 1.0708 1.0703

1.1180 1.1174 1.1164 1.1158

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

1.0844 1.0847 1.0844 1.0847

1.0634 1.0629 1.0648 1.0643

1 .OS58 1 .OS52 1 .OS73 1.0567

1 .I 250 1 .I256 1 .I 250 1.1256

1.1187 1.1181 1.1148 1 .I 142 1.1129 1.1123

1 .I 250 1.0709 1 .I 256 1.0712 1 .I 250 1.0709 1.1256 1.0712 1.1250 1.0709 1 .I 2561.0712 1.12350 7,11410 1 .I 23381.11422 1 .I 2500 1.11560 1 .I 2488 1.11572

1 .I 069 1.1 062 1 .I 046 1.1039 1.0438 1.0442 1.0438 1.0442

1.I 250 1.I 257 1.1 250 1.1257

1.0445 1.0442 1.0432 1.0429

rn.

13

Pitch Diam.

~~~

.>

1.0984 1.0981 1.0969 1.0966

1.0951 1.0948 1.0935 1.0932

in.

14

GO

1.07800 1.07788 1.07300 1.07288

1.07100 1.07088 7.06580 1.06568

1 .OS300 1.05288 1 .OS300 1.05288 1.04480 1.04468

-

38

2B

-

3B

2B

3B

28

-

3B

28

1B

1.01 500 2B 1.01488 1.00470 3B 1.00458

3B

28

1B

3B

28

16

-

Class

-

i .99800 ,99788 .99800 .99788 .98750 .98738

1.071 001.08200 1.07112 1.08188 1.071 00 1.07870 1.07112 1.07858

1.06500 1.06512 1.06500 1.06512

1.05700 1.05712 1 .OS700 1.OS712

1.03500 1.03512 1.03500 1.03512 1.03500 1.03512

.99000 .99012 .99000 .99012

.97000 .97012 .97000 .97012 .97000 .97012

1.03200 1.03188 1.03010 1.02998

in.

15

NOT GO

Minor Diameter

1.02400 1.02412 1.02400 1.02412

1

TZ Plain Gages for

1,0909 1.0906 1.0893 1.0890

1 .Oe26 1.0823 1.0787 1.0784 1.0768 1.0765

1.0528 1.0524 1.0505 1.0501

1.1082 1.0463 1.1075 1.0459 1.1035 1.0416 1 .I 0281.0412 1.1012 1.0393 1 .I 0051.0389

1.0600 1 .os95 1.0587 1.0582

in.

12

Major Diam.

1.0644 1.0650 1.0672 1.0678

1.10600 1.10612 1.11180 1.11192 1.11360 1.I 1372

1 .I 22901.I 0790 1.I 2278 1.10802 1 .I 2500 1.11000 1.12488 1.11012

1.0322 1.0326 1.0322 1.0326 1.0322 1.0326

1.0393 1.0396 1.0393 1.0396

in.

11

Pitch Diam.

NOT GO (HI)

T-

1.0779 1.0782 1.0807 1.0810

1.0077 1.0084 1.0115 1.0122

1.09820 1.1250 1.09832 1 .I 257 1 .I 06401.I 250 1.10652 1 .I 257 1 .I 08601.1250 1 .I0872 1.I 257

1.0625 1.0630 1.0625 1.0630

In.

10

1 .I 2280 1 .I2268 1.12280 1 .I 2268 1 .I 2500 1 .I 2488

in.

9

Major Diam.

1.05480 1 .OS492 1 .OS600 1.05612

in.

8

GO

NOT GO

GO

X Thread Gages

1.12320 1 ,I2308 T.12320 1.12308 1.12500 1.12488

1.0348 1.0352 1.0386 1.0390

.9882 1.0191 1.01 95 .9889 .9919 1.0228 .9926 1.0232 .9959 1.0268 .9966 1.0272

1.0341 1.0344 1.0363 1.0366

in.

6

Pitch Diam.

t

1,06130 1.06118 1.06250 1.06238

1

NOT GO (LO)

t

~~~~

Gages for Internal Threads

1.0421 1.0427 1.0451 1.0457 1.0484 1.0490

T

Plain Gages for Major Diameter

T2

I

1.0607 1 .0604 1.0631 1.0634 1 .OM4 1.0667

1.0330 1.0324 1.0330 1.0324 1.0348 1.0342

.9876 .9869 .9897 .9890

.9681 .9674 .9681 .9674 .9703 .9696

1.0226 1.0221 1.0238 1.0233

5

Pitch Diam.

Class

Minor Diam.

GO

1,0381 1.0378 1.0393 1.0390

Gages for External Threads X Thread Gages

Series besignation

I

I

TABLE 10 GAGES FOR STANDARD THREAD SERIES,CLASSES l A , ZA, 3A, lB, 2B, A N D 3B UNIFIED SCREW THREADS - LIMITS OFSIZE (CONT'D)

Nominal Size and Threads/in.

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

0

\

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

ASME B 1 . 2 83

m

2 5 7 5 5 1 2 001171b 0

GAGESAND GAGING FOR UNIFIEDINCHSCREWTHREADS

m

ANSIIASME B1.2-1983 AN AMERICANNATIONALSTANDARD

VI

ä U

m ~m

m

m N

m m

m N

m m

m N

m m

m ~m

m

m N

a m

m ?

m N

m m

~

o m o w o m w w

C'gg22 " 0 0 0 0

o w o w

O W N 0 h W h h h h W W

r r r r

0 000 r r r r

O N O N

O N O N

o r o r

C'888S " 0 0 0 0 r r r r

w s3s m m m m 0. 0. 0. 0. r r r r

o w o m o w m r m w h h

r r o o

r rrr r r r r O N O N o r o r

h h h h

m m m m 9000

Yrrr

0 w . o w o w m r w m m w m m m w Trrr

o w o w o w m m

r r r r

r r r r

rrrr.

3 %F4 rr.'1 r

O N O N o r o r

O N O N

O N O N o r o r

O W O N O N

. . . . c r r r

m m m m m m 999999

0 0 0 0 N N N r i

r rrr r r r r

o r o r

h h h h

N N N N

. . . .

r r r r r r y r

h w r w h h w m

2.P

m m m m

r rrr r r r r w o o w o o m m m w h h

. . . . r r r r

rrr7 r r r r

m h m h w w w w rTrr

m N m N

. . . .

r r r r

r rrr r r r y O N O N

w m m w

E22 . . . . Z r rrr r r r r r r r r o w o w w w o w

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r r r r

o w o w

w N m m

m m h h

w w w m 7rr.r . . " Y

r r r r

r r r r

w m w r w w m m

W

O

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h

wcowh

r. r. r r I .

r r r r

m r m r h

W

h

W

w w m m

r rrr r r r r O N O N

w m r N w w w w

h h h h F . r. r r r r

r o w m w

r

m o w m m h w w

w m h w

m r m r

h m h w w w m w

r rrr r r r r W

h

r

V .

. . . .

z

3

W

M

N

N

N

N

r r r r

. r. r. r.

m o m o

O h O h O h

w w w w

m m m m m m

h

W

h

W

rrrr r r r r

h

h

W

o m o w m r m m W W h h w m w w

w o w m m h m w T .

w m h w

rr

0 0 0 0 0 0

I N N N N Y

r r r r r r

W

o o w w

"

w o w m m h w w

w m h w

7 rrr r r r r

rr

r. Y . r r c r

m w r w o o m m w w w w

O m N m m m r r m m w w

r r r r

rlr:r.r r i r i

. . . .

r r r y

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h W

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0 Lb

r

r

r. r r r r 7 .

m w m w

r r m N

m m m m

r rrr t-rrr

. . . .

r r r r

5

5 z

z

3

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m

7 m

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3

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0

tA h

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W r

0

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s

g

L

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--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

m c o h o m w m N w w w m

r.

o o w w

m m m m

W

r

r"

2 2 Z X

5

W

r.r.

m m r r

i i i i

t s

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w o m h m m h w

L

m m m m m m

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rl-rr

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z

N

w w w m

m o m o

w m w w

r r r r

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W

N N r O

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r r r r

z

W

r rrr r c r r

N

r r r r

hhrr

. . . . r r r r

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V .

N W r m

m w m m

r ~.~.r:rr r r r r r r

N N N N r r

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m m o o

. . . . r r r r

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w w * w w w w w

.i m - 0m 0m0 m0 C ' W W W W

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w w w w

h

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o w o w o m o w o w m m m N m N N W

m m m m

r r r r

O N O N

o o w * h h h h 9 9 9. 9.

. . . .

o w o w o w r m h w m b

m m m m m m m m

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W

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W

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W W M W

0 0 0 0

s

o m m m w m m m

o w o w

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

r w m o m m w w w w w w

. . . .

r r r r r r r r

5 z

3

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. . . . . .

r r r r r r r r r r r r

UN

UNEF

UN

UN

UN

11/+16 or 1.250-16

11/4-18or 1.250-18

11/4-20or 1.250-20

11/4-28or 1.250-28

1716-8or 1.3125-8

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

VI QI

1.1941 1 .I 580 1 .I938 1 .I574 1.1941 1 .I580 1 .I 9381.1574 1.1598 1.1959 1.1956 1.1592

1A

UNF

11/4-12or 1.250-12

3A

2A

3A

2A

3A

2A

3A

2A

3A

2A

3A

2A

3A

1 .I883 1.1878 1.1898 1.1893

1.1808 1.1802 1.1823 1 .I817

1.1126 1.1119 1.1147 1.1140

1.2292 1.2288 1.2313 1.2309

1.2256 1.2253 1,2268 1.2265

In.

In.

7

1.2215 1.2218 1.2237 1.2240

1.2114 1.2117 1.2140 1.2143

1.24880 1.24868 1.25000 1.24988

1.24230 1.24242 1.24350 1.24362

1.24050 'I.24062 I.24190 1.24202

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

1 .I 950 1.31 0401.29540 1.1957 1.31028 1.29552 1 .I 9891.31250 1.29750 1 .I996 1.31238 1.29762

1.2138 1.2143 1.2160 1.2165

1.24860 1.24848 1.25000 1.24988

1.23980 1.23992 1.24130 1.24142

1 .I 955 1.24850 1 .I 9601.24838 1.1983 1.25000 1 .I 9881.24988

1.2075 1.2078 1.2103 1.2106 1.2006 1.2011 1.2032 1.2037

1.23910 1.23922 1.24060 1.24072

1.2028 1.2031 1.2056 1.2059 1.24850 1.24838 1.25000 1.24988

1.23100 1.23112 1.23680 1.23692 1.23860 1.23872

1 .I 893 1.1899 1 .I 921 1 .I 927

1.24778 1.25000 1.24988

in.

1.23290 1.23302 1.23500 1.23512

in.

9

NOT GO

I .24790

8 -

GO

1.24820 1.24808 1.24820 1.24808 1.25000 1:24988

1.1326 1 .I333 1.I 364 1.1371

-.

Minor Diam.

Z Plain Gages for Major Diameter

1.3125 1.3132 1.3125 1.3132

1.2500 1.2505 1.2500 1.2505

1.2500 1.2505 1.2500 1.2505

1.2500 1.2505 1.2500 1.2505

1.2500 1.2506 1.2500 1.2506

1.2500 1.2506 1.2500 1,2506 1.2500 1.2506

1.2500 1.2507 1.2500 1.2507

in.

10

Major Diam. Pitch Diam.

T in. 1.I 688 1.1692 1.I 688 1.1692

1113

"

GO

1.2443 1.2438 1.2427 1.2422

1.2431 1.2425 1.2415 1.2409

1.2440 1.2434 1.2400 1.2394 1.2380 1.2374

1.2313 1.2317 1.2313 1.2317

1.2268 1.2271 1.2268 1.2271

1.2946 1.2939 1.2923 1.2916

1.2476 1.2471 1.2463 1.2458

1.2175 1.2453 1.21 781.2448 1.21 751.2437 1.2178 1.2432

1.2139 1.2142 1.2139 1.2142

1.2094 1.2097 1.2094 1.2097

1.1959 1 .I 962 1.I 959 1.I 962 1.1959 1 .I962

1.2321 1.2314 1.2298 1.2291

in.

12

1.16000 1.16012 1.16000 1.16012 1.16000 1.16012

1.2405 1.2401 1.2382 1.2378

1.2321 1.2318 1.2308 1.2305

1.2236 1.2233 1.2220 1.2217

1.2202 1.2199 1.2186 1.2183

3B

28

-

-

3B

2B

-

3B

2B

38

2B

3B

2B

1B

-

38

2B

16

-

Class

1.22000 2B 1.21988 1.21760 38 1.21 748

1.20700 1.20688 1.20370 1.20358

1.20300 1.20288 1.I 9800 1.19788

1 .I9600 1.I 9588 1.19080 1.19068

1.17800 1 .I 7788 1.17800 1.17788 1.16980 1.16968

1.14000 1.13988 1.12970 1.12958

in.

15

GO

NOT

-I

T

1.17700 1.20200 1.17712 1.20188 1 .I 77001.19220 1.17712 1.19208

1.21100 1.21112 1.21100 1.21112

1.19600 1.19612 1 .I 9600 1.19612

1.19000 1 .I9012 1 .I 9000 1.19012

1.2160 1 .I8200 1.21 57 1.18212 1.2144 1.18200 1.21 41 1.18212

1.2079 1.2076 1.2039 1.2036 1.2019 1.2016

1.11500 1.11512 1.11500 1.11512

in.

14

GO

Z Plain Gages for Minor Diameter

i

T

1.1780 1.1776 1 .I757 1.1753

in.

NOT Co (HI)

X Thread Gages

Gages for Internal Threads

--

r t t

1.I 849 1.1669 1 .I 8521.1675 1 .I 8791.1699 1.1882 1.1705 1.1913 1.I 733 1.1916 1.1739

1.1597 1,.1601 1.1635 1.1639

In.

6

Pitch Diam.

1 .I 751 1.2221 1.1744 1.2225 1.1772 1.2260 1.1765 1.2264

1.2101 1.2096 1.2113 1.2108

1.7944 1.2161 1,2158 1.1939 1.2175 1.1958 1.21 72 1.1953

1.2124 1.21 21 1.2139 1.2136

1.2079 1.2076 1.2094 1.2091

In.

1.1667 1 .I663 1.1688 1 .I 684

2A

UN

11/4-8or 1.250-8

5

4

3

2

1

Minor Diam.

Pitch Diam.

NOT G O (LO)

Gages Threads for External

Class

1

Series Designation

I

Nominal Size and Threads/in.

I

-

TABLE 10 GAGES FOR STANDARD THREAD SERIES,CLASSES I A , 2A, 3A, IB, 2B, A N D 3B UNIFIED SCREW THREADS LIMITS OFSIZE (CONT'D)

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

GAGESANDGAGlVG FOR UNIFIED INCH SCREW THREADS

m

~m

m

ANSI/ASME B1.2-1983 ANAMERICANNATIONALSTANDARD

m ~m

m

o o m m

o w m r m m m m

w w w m

. . . .

N N N N

r r r r

m ~m

m

O

O

W

m

~m

m

m ~m

o w o w O W N 0 o m w w h W W W N Y ? ?

W

o w m m m w o o w w w w NNN.N

r r r r

r'rt-

z

o r o c w w w w m m m m

* . . . r r r r . . . r-.

n d

NNNN r r r r

h * r w w w w w

N N r O

. . . .

hw

m

~

0 0 0 0

h h W l n 0 0 0 0

r r r r

9 119 r r r r

9111

o m o m

0 0 0 0

O N O N O N

w w w *

. . . .

m m m m m m w w w w w w ? ? ? N ? ?

hr w w m o m w w r o o 0

W h N W r V I

o r o r

o r o r o r

h h h h N N N N r r r r

r r r r r r

wwT)w NNNN r r r r

m w m w m N w w w w w w ~ . .m . m. . m.

1111 r r r r

m w m w m m m m w w w a

NNNN r r r r

hrhrhr

w h w w w h w w w h w w ?N?NN?

r r r r r r

W N C O N

m w m w m m m m NNNN r r r r

N N N N N N

. . . . . .

~ m m m m m r r r r r r

. . . . . .

O N O N W h r N r0 r0 m0 0 m

'?"T'?

r r r r

r r r r

. . . . r r r r

O N O N

m w a m ~ ~ 0 0 0 0 ' ? T 1 1

O N O N o r w m m mm w w m

O N O N O N

1 111 r r r r

11?111

m o h m w h 1 n w r r m m m m w w w w

0 0 0 0

r r r r

r r r r c r

o w m m

o w o w m r m m

r r r r

rrrP

O W O W

r O N N

1111

1111

r - r r

o m w w w o m m w NNN

r r r r

m r w N

m w m o w w w c n

N O N O W c r W h o r w m

r r r r

N?NN

r r ? r

N I N N N N

NNNC'!

r r r r

h h h h

o m ~ v w w w w w w w

y r r r

m

W m h O N m m m r i m w w oorrrr C ? c ? r r r r r r

m w h o m m m m

mmmmwr\l N N N r 4 W - r w w w w w w

r r r r

r r r r r r

O O N r

r m r m m h ~ r ~ r

v h w m m m

NP"?"!

r rrrrr r r r r r r

NNNN

m m m m m m

r r r r

m w v t -

N N N N

W W W W h h h h N N N N

r r r r

r r r r

. . . .

r r r r r r

m o m 0 h W C N m m w w NNNN

. . . .

w m m w m m m m

h h h h

r r N N N N

N N N N r r r r

r r r r

oorr

r c r r r c

r w h N m m m w w w w w

NNNN

w r m w

o w ro m w oo w w r m mNmr4m-r h h h h h h m. m. m. m. m. m.

rrNN

m w r w m m w w w w w w

2

o r o r o r

h h h h h h

1111

Z

m N m N m N

W M W M W W r r r r r r

r O N N r r r r

. , . . r r r r

~

o w o w o w m m m m m m

o w o w o w m m

r r r r

m

r r r r r r

. . . .

. . . .

r r r r r r

O N O N

r r r r

. . . . r r r r

w m o h w w o m h

r w m o w h m m w c o w w

yrrr

r r r r

h

. . . .

h

W

N.NNN

Z

Z

3

2

N C'! N.?

m m m m h m w m w m w w w w w w wm wm m c n

N NNNNN r r r r r r

N Y I N r r r r

. . . . . .

N N N N N N

o h o h m w m w m w o o r

-

r

r

N

N

1 11111 r r r r r r

Z

3

W

W

2

r

Y m

5 m

N

1

1 r

r

b

L

W

W

5 r

5 r

0

Y

5 W

W

57 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

r r r r

o w o w o w o w o w 3 > w o o o o m c n 1111?N W N M N W W '

r r r r

. ' . . r r r r

+

r r r r r r

o w o w o w h m m w w w w w m m ??P"?

. . . .

N N N N r r r r

w m ~ w w m w

+

o w o w o w o w o w w w m w m w w w N N N N r r NNNC"NN

r r r r

O N O N

, . . . r r r v

m

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

0

ASME B L - 2 83

m 2575532 003L737

m

b

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

ANSVASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

m N

m m

m N

m m

m m h l m

m ~m

m

m N

m m

m N

m m

m ~m

m

m N

m m

ocooco o m m r

rnu-hh

w w m m m. m. m. m. r r r r

O N O N

s

="=T

O N O N

O N O N

w w w w m m m m

N N N N 0 0 0 0

?'?'?M

'?'?C?'? r7r-I-

. . . .

. . . .

r r r r

h m w o

m m h w m m m m

m m m m w w w w m m m m

r

r r r r

'?C?'?'? r r r

r r r r

M'?'?'?

r r r r

W N O W

r r r r

O N O N o r o r 0 0 0 0 h h h h

o r o r

o r o r

. . . .

. . . .

r r r r

. . . .

r r r r

r m N w

hWVIu-

N N N N

u .- u -. u -.u -.

. . . . r r r r

r r r r

. . . .

r r r r

. . . .

, . . .

r r r r

rrCr

. . . .

O N O N

m ww u -mum -w w w w w

. . . .

r r r r

r r r r

O N O N

m o m u w h m m

O N O N m u-mw O O N N

O N G N

O N O N W.WDrN

0999

9 9 9 9

9909

r r r r

r-rrr

. . . .

r r r r

r r r r

C?'?'?'?

. . . .

r r r r

N N N N

m u - r m u -u-ww N N N N

r r r r

r r r r

wwcoco N N N N 9 9 9 9 r r r r

ocooco

s

. . . .

r r r r

h m m m m m h h m m m m

9699 r r r r

W N m r

w h m o h h h O m. m. m. m.

. . . . r r r r

'la

r r r r

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r u - o m o o m m m m m m

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2.5

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r

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N

M . ' ?.' ? .' ?

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O m N m O m N r o m 0 0

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r r r r

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L

Z 3

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f)

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r

m h '?

r L

0 W

r

Rr 58 Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

r r r r

$ 4 ,

Z

"

m o m w m m w w m m m m '??'?'?

. . . .

W

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

C?'?'?'?

r r r r

$ 4 ,

3

m h m m w w w w

' ?. y.m "- m

rr-rr- r r r r

"

r r r r

Z 3

Z 3

A S M E B 1 0 2 83

rn

2 5 7 5 5 1 2 0011720 2

GAGES AND GAGING FOR UNIFIED INCH SCREWTHREADS

m

m

CY^

ANSI/ASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

m N

m m

gs

m

N

m

m r

m

m m

o w o m o w r m h w m t

o w o w w w

SSSP:

m mm'?mm r r r r r r

O W O W O W

0 0 0 0 r r r r

O N O N

s

m N

o m o m m m m w m w m m

O N O N O N o r o r o r

o r o r

m

m

N

o O o m

m

m

w w mw

o h mh

r

w m m h

0 0 0 0 0 0 N N N N N N

r r r r

r r r r r r

. . . . . .

r r r r r r

. . . .

r r r r

2222

S S S S S S

r r r r r r

O N O N

O N O N O N o r o r o r

w w w w

. . . . r r r r

W

. . . . . .

rrr-rrr

o w o w o w

m o m o h W h W m m m m S S S S

0 0 0 0 0 0 0 0 0 0 0 0

V!V!V!V!YV!

r r r r

r r r r r r

N

W

$r r3 r3 r5 O N O N

m

o w o w o w o w N r w h

m m v S S Y f

r r r r

O N O N

o r o r N N N N m m m m

0 0 0 0

rrrr-

r r r r

o r o r

Y Y S S

qqqq

o w o w

o m o m

S S S Y

r r r r O h O h

0 0 0 0

o w o w o w

o c o o

0 0 0 0 0 0 0 0 0 0 0 0

r r r r

r r r r r r

?V!?? ???V! r r r r r r r r

O N O N O N

O N O N

a:SS-.SY

S SSf r r r r

V!V!V!V!

o w o w

o w o w w w o w h h o m

r r r r

r r r r

r r r r

r w m o r r m w

N m N m

P S S S

'?-"!C?

V!V!V!V!V!V!

N O m m W h h m m m m Y S S S

0 0 0 0 0 0 0 0

O r w h m m o o w w m m

o w o w - N O W w w o m

m m o m

m m o m S B ? S

S t Y S

0 0 0 0 0 0 0 0

r r r r

o w o w m m o w w w o m

m m o m

ST?-? r r r r

N N W W

w w w w

0 0 0 0 r r r r

. . . .

r r r r

r r r r

C Y W N W W O

h h r r m w

h h W W W W

m mmm?'? r r r r r r m ~ m r r m N w w w w

m

m

N

W

'?'?C?" r r r r

o w o w o w w w w m o o

m

r r r r

m m m m

o m w r w w o r w w m m

m

m m w m

r r r r r r

SST-?

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. . . .

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59 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

0

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

ANSVASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

m N

m

m N

m

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Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

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2 5 7 5 5 3 2 0033722 b

83

GAGESANDGAGING FOR UNIFIED INCH SCREW THREADS

ANSVASME 61.2-1983 ANAMERICANNATIONALSTANDARD

c a m N m

c a m N m

m r i

m c a N m

m m

c a m

m

N

o w o w o m w w

r o m m h h w w L????

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r r r r

,

o w o o r o 0 0 0 m m m Y Y Y

s

w r

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m Y

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r r r r

. . . . r r r r

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h h h h

o o o c L? L-! U

r r r r

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r c r r

h

h

h

b

r r r r

ocooa

m m m v r ' N N N N . - .m .w w . u. r r r r

. . . . r r r r o w o w m m o r

h h O O

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r r r r

w m m m 0 ~ 1 m m

W W W W

w w w w

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. . . .

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m m m m

m m m m

h h h h

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3

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w. w. w. w.

W. G. w. w.

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ASME B I - 2 83

2595532 OOLL723 8

ANSVASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

m N

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

m m

m N

m m

m N

m m

m

r

m

N

m

m

m N

m m

w o w w w w m m m m w m ??L??

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m

N

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m

m m

m N

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r r r r

r r r r

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0

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w w w w www?

m m

o w o w o w w w w m o o

m m m m

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~

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0

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0 0 0 0

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r r r r

m m

o w o u o r o r

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h h h h

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w w r h m m N r ; m m m l r . - w w w u

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. . . , r r r r

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rrNNNN

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w m w r N m m w

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r r r r

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N N N N

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wwww

. . . . r r r r

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m m w a N N m m

0 0 0 0

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r r r r

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w a a a w w w w

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r r r r

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62 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

7 Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

0

ASME B I - 2 83 W 2 5 7 5 5 3 2 003372'i T W

ANSI/ASME B1.2-1983 ANAMERICANNATIONALSTANDARD

GAGES AND ,GAGING FOR UNIFIED INCHSCREW THREADS

m N

m m

m N

m m

m

N

m N

m

m

m m

a N

m m

r r r r

r r r r

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w r w m

i i i i

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o o m m

w r m m

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rr-rr

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m m m m r r r r m m m m hhhh

o w o w o r o r o o c o

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r r r r

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m h m h

m m w m h w w m

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. . . . r r r r

~

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m m

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r r r r

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s

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. . . .

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w o m m

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d

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63 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

. . . .

r r r r

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

Z

2

$

2 Z

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ASME 93.2 8 3

m

2 5 7 5 5 3 2 0033725 I

ANSVASME 81.2-1 983 AN AMERICAN NATIONAL STANDARD

-P Y)

U

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m

~m

m

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

m

m

w

m

m

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m

m

N

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m

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m

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r r r r

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w m m w cowww w. w. w. w.

$

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

w r w m w. w.

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GAGES AND 'GAGING FOR UNIFIED INCH SCREW THREADS

m

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ANSIIASME B1.2-1983 ANAMERICANNATIONALSTANDARD

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GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

ANSVASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

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NOT GO (HI)

W Thread-Setting Rings

-

10

._ _. , ... ,.

1.76500 1.76525 1.76790 1.76815

1.75060 1.75085 1.75390 1.75415

1.72140 1.72165 1.72560 1.72585

1.69330 1.69355 1.69790 1.69815

1.7112 1.7114 1.7139 1.7141

1.70250 1.70275 1.70540 1.70565

1.68810 1.68835 1.69140 1.69165

1.65925 1.66310 1.66335

in.

9

Pitch Pitch Diam. Full-Form Diam.

NOT

E:jo;Diameter

1.6941 0 1.69385 1.69590 1.69565

in. 1.66650 1.66625 1.66880 1.66855

6

Pitch Diam.

GO

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

1.8110 1.8115 1.81 25 1.8130

1.8109 1.8115 1.8125 1.8131

1.8107 1.8113 1.8125 1.8131

1.7978 1.7972 1.7996 1.7990 1.8004 1.7998 1.8020 1.8014

1.8102 1.8109 1.8125 1.8132

1.8100 1.81 08 1.8125 1.8133

1.7485 1.7490 1.7500 1.7505

1.7484 1.7490 1.7500 1.7506

1.7482 1.7488 1.7500 1.7506

1.7931 1.7924 1.7954 1.7947

1.7890 1.7882 1.7915 1.7907

1.7395 1.7390 1.7410 1.7405

1.7379 1.7373 1.7395 1.7389

2A 1.7353 1.7347 3A 1.7371 1.7365

3A

2A

*

UN

UN

13/4-16 or 1.750-16

13/4-12 or 1.750-12

174-8 or 1.750-8

in. 1.7477 1.7484 1.7500 1.7507

Full-Form

Truncated

Major Diameter

GO

Class

I

I

T

"

W Thread-Setting Plugs

TABLE 11 SElTlNG GAGES FOR STANDARD THREADSERIES, CLASSES I A , 2A, 3A, IB, 28, A N D 3 8 UNIFIED SCREW THREADS - LIMITS OF SIZE (CONT'D)

,,)

I

Nominal Size

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

38

28

38

28

38

28

38

28

38

28

38

28

38

28

38

28

38

28

14

Class

UN

UN

UN

UN

UN

UN

UN

1%-8 or 1.875-8

17/8-12 or 1.875-1 2

178-16 or 1.875-16

17/8-20 or 1.875-20

11yl6-6 or 1.9375-6

1%6-8 or 1.9375-8

l1%6-120r 1.9375-12

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

UN

2

1

17/84 or 1.875-6

Series Designation

Nominal Size and Threads/in.

1.8645 1.8640 1.8660 1.8655

2A

3A

2A

34

1.9228 1.9222 1.9246 1.9240

1.91 81 1.9174 1.9204 1.9197

LA

3A

1.9139 1.9131 1.9165 1.9157

2A

3A

3A

1,8629 1.8623 1.8645 1.8639

2A

3A

2A

3A

1.8603 1.8597 1.8621 1.8615

1.8556 1.8549 1.8579 1.8572

2A

3A

in. in.

7

in.

8

1.81310 1.81335 1.81640 1.81665

1.8732 1.8738 1.8750 1.8756

7.8546 1.8734 1.83280 1.8540 1.8740 1.83255 1.83440 1.8575 1.8750 1.83415 1.8569 1.8756

1.88340 1.88365 1.88340 1.88365

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

1.87550 1.87575 1.87890 1.87915

1.9357 1.9363 1.9375 1.9381 1.9116 1.9110 1.91 50 1.9144

1.9352 1.84630 1.9359 1.84655 1.9375 1.85050 1.9382 1.85075 1.9004 1.9352 1.85400 1.9359 1.85375 1.8997 1.9046 1.85630 1.9375 1.9039 1.85605 1.9382 1.88160 1.9357 1.88135 1.9363 1.88340 1.9375 1.9381 1.88315

1.85630 1.85655 1.85630 1.85655

1.81 810 1.81835 1.82280 1,82305

1.9349 1.9357 1.9375 1.9383

1.8903 1.9349 1.82660 1.8895 1.82635 1.9357 1.82920 1.8950 1.9375 1.9383 1.82895 1.8942

1.8470 1.8464 1.8470 1.8464

1.8020 1.8013 1.8020 1.8013

1.7570 1.7562 1.7570 1.7562

1.8210 1.8205 1.821 0 1.8205

1.8425 1.8427 1.8425 1.8427 1.8362 1.8364 1.8389 1.8391

1.8735 1.8740 1.8750 1.8755

1.8579 1.8410 1.8735 1.8740 1.8408 1.8574 1.8606 1.8750 1.8425 1.8755 1.8423 1,8601

1.82920 1.82945 1.82920 1.82945

1.8070 1.8064 1.8070 1.8064

1.83440 1.83465 1.83440 1.83465

1.7400 1.7393 1.7400 1.7393

1.89130 1.89105 1.88930 1.88905

1.86630 1.86605 1.86380 1.86355

1.84030 1.84005 1.83750 1.83725

1.8488 1.8486 1.8472 1.8470

1.84130 1.84105 1.83960 1.83935

1.82870 1.82845 1.82670 1.82645

1.80380 1.80355 1.80130 1.80105

1.77770 1.77745 1.77490 1.77465

in.

1A950 1.6942 1.6950 1.6942

in.

Pitch Diam.

1,8650 1.8644 1.8573 1.8567

1.8270 1.8263 1.81 72 1.8165

1.7880 1.7872 1.7771 1.7763

1.8320 1.8315 1.8287 1.8282

1.8210 1.8204 1.8158 1.8152

1.8030 1.8024 1.7948 1.7942

1.7650 1.7643 1.7547 1.7540

1.7250 1.7242 1.7146 1.71 38

in.

13

Minor Diam.

NOT GO (HI)

12

T 11

Minor Diam.

1.82750 1.8734 1.8740 1.82775 1.8750 1.83040 1.8756 1.83065

1.79380 1.79405 1.79380 1.79405

1.76670 1.76695 1.76670 1.76695

in.

10

Pitch Diam.

GO

W Thread-Setting Rings

1.7850 1,7844 1.7850 1.7844

T

1.82090 1.82115 1.82090 1.82115

1.8727 1.79150 1.8734 1.79125 1.8750 1.79355 1.8757 1.81910 1.8492 1.8732 1.8486 1.8738 1.81885 1.82090 1.8525 1.8750 1.82065 1.8519 1.8756

1.75580 1.75605 1.76040 1.76065

in.

9

1.78380 1.78405 1.7881 0 1.78835

1.8280 1.8725 1.76420 1.8733 1.8272 1.76395 1.8733 1.8750 1.8326 1.76670 1.8758 1.8318 1.76645 1.8758

6

Diam.

1.8727 1.8379 1.8734 1.8372 1.8422 1.793801.8750 1.0757 1.841 5

1.8750

1.8725

in.

1,8515 1.8507 1.8540 1.8532

in.

Full-Form 5

1

4

Truncated

2A

3

Class

Major Diameter Pitch FUII-Form Truncated Diam.

Major Diameter Pitch

NOT GO (LO)

GO

W Thread-Setting Plugs

TABLE 11 SETTING GAGES FOR STANDARD THREAD SERIES,CLASSES, ?A, i!A:,3A, IB, 2B, A N D 38 UNIFIED SCREW THREADS - LIMITS OF SIZE (CONT'D 1

3B

28

38

2B

38

2B

38

2B

38

28

38

28

38

28

3B

2B

14

Class

"

T --`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

GAGES AND GAGING FOR UNIFIED INCH SCREWTHREADS

m N

m m

. . . . r r r r

ANSI/ASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

m N

m m

m

m

r

m

N

m N

m

m m

m N

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m N

m m

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Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

5

5

L

2

5

ASME 8 1 - 2 83 W 2 5 9 5 5 3 2 0033769 T

GAGES AND GAGING FOR UNIFIED INCH SCREWTHREADS

ANSI/ASME B I .2-1983 AN AMERICAN NATIONAL STANDARD

m

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m

m N

m m

m

m

N

m

m

N

m

m

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m m

m m r r i

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I08 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

c m o m

w m w m h w N N N N m m 0 0 0 0 0 0 r T r r r T

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

Z 3

UN

UN

23/8-20 or 2.375-20

23/8-16 or 2.375-16

23/8-12 or 2.375-12

278-8 or 2.375-8

I

1

I

I

UN

UN

UN

3A

2A

3A

2A

3A

2A

3A

2A

3A

2A

3A

2A

3A

2A

-

" r

278-6 or 2.375-6

I

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

W

0

I

UN

a1/4-16 or 2.250-16

21/4-20 or 2.250-20

2A

UN

21/4-12 or 2.250-12 3A

3

2

1

-

Class

Series Designation

Nominal Size and Threads/in.

t

T

-

5

Full-Form

2.3726 2.3733 2.3750 2.3757

In.

in.

2.3410 2.3408 2.3425 2.3423

2.33270 2.33245 2.33440 2.33415

2,31900 2.31875 2.32090 2.32065

2.29140 2.29115 2.29380 2.29355

2.26400 2.26375 2.26670 2.26645

2.2160 2.2158 2.2175 2.21 73

2.20780 2.20755 2.20940 2.20915

I

2.3726 2.3733 2.3750 2.3757

2.3723 2.3731 2.3750 2.3758

2.2485 2.2490 2.2500 2.2505

2.2484 2.2490 2.2500 2.2506

in. 2.2482 2.18825 2.2488 2.2500 2.2506

2.3731 2.3737 2.3750 2.3756

2.3576 2.3571 2.3604 2.3599

2.3543 2.3537 2.3574 2.3568

1

2.3735 2.3740 2.3750 2.3755

2.3733 2.3739 2.3750 2.3756

"

2.3489 2.3483 2.3524 2.3518

a

Full-Form Diam.

"

2.3374 2.3367 2.3419 2.3412

2.3273 2.3265 2.3323 2.3315

2.2328 2.2323 2.2355 2.2350

2.2295 2.2289 2.2325 2.2319

2.2241 2.2235 2.2275 2.2269

7

6

2.19410 2.19385 2.19590 2.1 9565

Truncated

t

Pitch biam.

NOT GO (LO)

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

2.3645 2.3735 2.3640 2.3740 2.3660 2.3750 2.3755 2.3655

I

2.3628 2.3733 2.3622 2.3739 2.3645 2.3750 2.3756 2.3639

2.3602 2.3731 2.3737 2.3596 2.3621 2.3750 2.3615 2.3756

2.3555 2.3548 2.3579 2.3572

2.3513 2.3723 2.3731 2.3505 2.3540 2.3750 2.3532 2.3758

2.2395 2.2485 2.2490 2.2390 2.2410 2.2500 2.2405 2.2505

2.2379 2.2484 2.2373 2.2490 2.2395 2.2500 2.2389 2.2506

In. in. 2.2482 2.2353 2.2488 2.2347 2.2500 2.2371 2.2365 2.2506

4

Truncated

Major Diameter

GO

T

W Thread-Setting Plugs

-

2.3359 2.3361 2.3387 2.3389

2.32720 2.32745 2.33030 2.33055

2.31280 2.31305 2.31630 2.31655

2.28330 2.28355 2.28780 2.28805

2.25510 2.25535 2.26010 2.26035

2.2111 2.2113 2.2138 2.2140

2.20240 2.20265 2.20540 2.20565

2.19140 2.19165

in. 2.18800

9

Pitch

2.3425 2.3427 2.3425 2.3427

2.33440 2.33465 2.33440 2.33465

2.32090 2.32115 2.32090 2.321 15

2.29380 2.29405 2.29380 2.29405

2.26670 2.26695 2.26670 2.26695

2.2175 2.2177 2.2175 2.2177

2.20940 2.20965 2,20940 2.20965

in. 2.19590 2.19615 2.19590 2.19615

10

Pitch Diamd

i GO

2.3210 2.3205 2.3210 2.3205

2.3070 2.3064 2.3070 2.3064

2.2850 2.2844 2.2850 2.2844

2.2400 2.2393 2.2400 2.2393

2.1950 2.1942 2.1950 2.1942

2.1960 2.1955 2.1 960 2.1955

2.1820 2.1814 2.1820 2.1814

2.1600 2.1594 2.1600 2.1594

in.

11

Minor Diam.

T

2.1960 2.1954 2.1908 2.1902

2.1780 2.1774 2.1698 2.1692

In.

13

Minor Diam.

2.3210 2.3204 2.3158 2.3152 2.3491 2.3320 2.3489 2.3315 2.3475 2.3287 2.3282 2.3473

2.34160 2.34135 2.33980 2.33955

2.32900 2.3030 2.32875 2.3024 2.32690 2.2948 2.32665 2.2942

2.30430 2.2650 2.30405 2.2643 2.30170 2.2547 2.30145 2.2540

2.2260 2.27820 2.27795 2.2252 2.27530 2.2146 2.27505 2.2138

2.2239 2.2070 2.2237 2.2065 2.2223 2.2037 2.2221 2.2032

2.21640 2.21615 2.21460 2.21435

In. 2.20380 2.20355 2.20180 2.20155

12

Pitch Diam.

NOT GO (HI)

W Thread-Setting Rings

TABLE 11 SETTING GAGES FOR STANDARD THREAD SERIES,CLASSES, IA, 2A, 3A, IB, 2B, AND 3B UNIFIED SCREW THREADS LIMITS OF SIZE (CONT'D

3B

28

38

2B

3B

28

38

28

14

Class

-

3B

28

-

3B

28

-

38

2B

-

38

2B

-,

T

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

2 5 9 5 5 3 2 0011773 8

ASME B L - 2 83

m GAGESANDGAGING FOR UNIFIED INCH SCREW THREADS

ANSI/ASME 81.2-1983 ANAMERICANNATIONALSTANDARD m r

m

m

~

m w

m

o

m

~m

m

m

m

~m

m

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

o*o* o m o m r o r o PS?-.

.n

N N N N

0 V L o m m o w 0 m m m m rrr'i

S ? t Y

N N N N

riririri

Gririri n o o m

n m o o n m o o **mu) Gririri

m o o m

r h o u

m m o o m m o o

w m o c m m o c YYV!V

-?-?:a

N N N n

m m o N

r o w m

/?

0 0 0 0

W W W W

I

5 U

Z

3

z

3

L

Z

3

3

3

N r

z

V!

N

0

s

0

0

V! N

V! N

L

b

sN

N

0

Y 0

z

L

0

W

d

s

s

r

N

1 IO Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

3

2

N r

9

z

W

0

L

L

cj

0

0

5

s

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

N

z

3

s z

3

UN

UN

UN

UN

23/4-6 or 2.750-6

2%-8 or 2.750-8

23/4-12 or 2.750-12

2v4-16 or 2.750-16

UN

25/8-20 or 2.625-20

UNC

UN

25/8-16 or 2.625-16

274-4 or 2.750-4

UN

3A

2A

3A

2A

3A

2A

3A

2A

3A

2A

1A

3A

2A

3A

2A

3A

2A

3

2

1

25/8-12 or 2.625-12

Class

Series Designation

CO

in.

2.7378 2.7372 2.7395 2.7389

2.7352 2.7346 2.3371 2.7365

2.7304 2.7297 2.7329 2.7322

2.7263 2.7255 2.7290 2.7282

2.7187 2.7178 2.7187 2.7178 2.7219 2.7210

2.6145 2.6140 2.6160 2.61 55

2.6128 2.6122 2.6145 2.6139

In.

6

Pitch Diam.

in.

2.62990 2.63015 2.63490 2.63515 2.65800 2.65825 2.66250 2.66275

2.7021 2.7473 2.7481 2.7013 2.7071 2.7500 2.7063 2.7508 2.7475 2.7121 2.7114 2.7482 2.7167 2.7500 2.7160 2.7507 2.7239 2.7481 2.7233 2.7487 2.7274 2.7500 2.7506 2.7268 2.7293 2.7483 2.7287 2.7489 2.7500 2.7324 2.7506 2.7318

2.66630 2.66605 2.66880 2.66855 2.69400 2.69375 2.69590 2.69565 2.70770 2.70745 2.70940 2.70415

2.63900 2.63875 2.64170 2.64145

2.64170 2.64195 2.64170 2.64195

2.58760 2.58785 2.58760 2.58785 2.58760 2.58785

2.5925 2.5927 2.5925 2.5927

2.58440 2.58465 2.58440 2.58465

2.57090 2.57115 2.57090 2.57115

2.70220 2.70245 2.70530 2.70555

2.68780 2.68805 2.69130 2.69155

in.

10

Pitch Diam.

2.66880 2.66905 2.66880 2.66905

2.70940 2.70965 2.70940 2.70965

2.69590 2.69615 2.69590 2.6961 5

2.5350 2.5344 2.5350 2.5344

in.

11

Minor Diam.

T

2.6820 2.6814 2.6820 2.6814

2.6600 2.6594 2.6600 2.6594

2.6150 2.6143 2.6150 2.6143

2.5700 2.5692 2.5700 2.5692

2.4790 2.4781 2.4790 2.4781 2.4790 2.4781

2.5710 2.5705 2.5710 2.5705

2.5570 2.5564 2.5570 2.5564

7

GO

2.71660 2.71635 2.71480 2.71455

2.70400 2.70375 2.70190 2.70165

2.67960 2.67935 2.67690 2.67665

2.65360 2.65335 2.65060 2.65035

2.60820 2.60795 2.60130 2.60105 2.59790 2.59765

2.5991 2.5989 2.5975 2.5973

2.59160 2.59135 2.58980 2.58955

2.57900 2.57875 2.57690 2.57665

In.

12

Pitch Diam.

W Thread-Setting Rings

"

t

T

"

2.56860 2.56885 2.57390 2.57415 2.57970 2.57995

2.7468 2.7477 2.7468 2.7477 2.7500 2.7509

2.58440 2.58415 2.58440 2.58415 2.58760 2.58735

2.5859 2.5861 2.5887 2.5889

2.57720 2.57745 2.58030 2.58055

2.6769 2.6760 2.6822 2.6813 2.6880 2.6871

2.6233 2.6239 2.6250 2.6256 2.6235 2.6240 2.6250 2.6255

2.6043 2.6037 2.6074 2.6068

2.56280 2.56305 2.56630 2.56655

in.

2.5989 2.6231 2.5983 2.6237 2.6024 2.6250 2.6018 2.6256

in.

9

8

7

Pitch Diam.

Full-Form

Truncated

Major Diameter

2.6076 2.6071 2.6104 2.6099

2.5910 2.5908 2.5925 2.5923

2.58270 2.58245 2.58440 2.5841 5

2.56900 2.56875 2.57090 2.57065

T

NOT GO (LO)

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

2.7483 2.7489 2.7500 2.7506

2.7481 2.7487 2.7500 2.7506

2.7475 2.7482 2.7500 2.7507

2.7473 2.7481 2.7500 2.7508

2.7468 2,7477 2.7468 2.7477 2.7500 2.7509

2.6235 2.6240 2.6250 2.6255

2.6233 2.6239 2.6250 2.6256

2.6231 2.6237 2.6250 2.6256

in.

2.6102 2.6096 2.6121 2.6115

5

4

Full-Form

Major Diameter Truncated

t

W Thread-Setting Plugs

-

TABLE 11 SETTING GAGES FOR STANDARD THREAD SERIES,CLASSES, IA, 2A, 3A, lB, 2B, A N D 38 UNIFIED SCREW THREADS LIMITS OF SIZE (CONT'D)

Nominal Size and Threads/in.

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

C

--

`---

2.6960 2.6954 2.6908 2.6902

2.6780 2.6774 2.6698 2.6692

2.6400 2.6393 2.6297 2.6290

2.6000 2.5992 2.5896 2.5888

2.5170 2.5161 2.5170 2.5161 2.5094 2.5085

2.5820 2.5815 2.5787 2.5782

2.5710 2.5704 2.5658 2.5652

2.5530 2.5524 2.5448 2.5442

In.

13

Minor Diam.

I

3B

28

ASME B I - 2 83 W 2 5 7 5 5 3 2 0033.773 3

GAGESANDGAGING FOR UNIFIEDINCH SCREW THREADS

ANSI/ASME B1.2-1983 ANAMERICANNATIONALSTANDARD U

ä

U

m

w

m

m

n v

m m

n ~m

n

m

v

n ~m

m

m

r n m ~m

m

.XE "i

3 m o m

r o r o

U N N N

w m m m

.iririri 3 m o m w o w 0 w m w nq m m m

Gririri

riririri

m m o w

m m m m h h h h m w w w

m r ro wm wr mlnlnm m m m m

o m o m m o w m r r m m mm m m

-.

h h h h

N wmr m~ o w m w w m m m m

Z 3

Z 3

r

Z 3

Z 3

Z 3

U Z 3

Z 3

I

L

W

r

m

h

2 L

L

0

0

W

r

0

N

2

s I12 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

F

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

riririri

UN

UN

3%-6 or 3.125-6

3%-8 or 3.125-8

31/8-16 or 3.125-16

3%-12 or 3.125-12

~~

UN

3-20 or 3.000-20

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

W

I

UN

3-16 or 3.000-16

~

UN

3-12 or 3.000-12

~

UN

3-8 or 3.000-8

3

2

1

t

-

3A

2A

3A

2A

3A

2A

3A

2A

-

3A

2A

3A

2A

3A

2A

-

3A

2A

I__

Class

Series Designation

Nominal Size and Threads/in.

-

3.1128 3.1 122 3.1145 3.1139

3.1 102 3.1 096 3.1121 3.1115

3.1 053 3.1046 3.1 079 3.1072

3.1 01 2 3.1004 3.1040 3.1032

2.9894 2.9889 2.9910 2.9905

2.9878 2.9872 2.9895 2.9889

2.9852 2.9846 2.9871 2.9865

In. 2.9803 2.9796 2.9829 2.9822

4

Truncated

...."

3.0988 3.0982 3.1023 3.1017

3.0867 3.0860 3.0915 3.0908

3.0767 3.0759 3.0819 3.0811

2.9824 2.9819 2.9853 2.9848

2.9792 2.9786 2.9823 2.9817

2.9738 2.9732 2.9773 2.9767

in. 2.9618 2.9611 2.9665 2.9658

7

Truncated

3.1231 3.1237 3.1250 3.1256

3.1224 3.1231 3.1250 3.1257

3.1222 3.1230 3.1250 3.1258

2.9984 2.9989 3.0000 3.0005

2.9983 2.9989 3.0000 3.0006

2.9981 2.9987 3.0000 3.0006

In. 2.9974 2.9981 3.0000 3.0007

8

Full-Form

Major Diameter

NOT CO (LO)

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

- --.

3.06900 3.06875 3.07090 3.07065

3.04120 3.04095 3.04380 3.04355

3.01390 3.01365 3.01670 3.01645

2.9659 2.9657 2.9675 2.9673

2.95770 2.95745 2.95940 2.95915

2.94400 2.94375 2.94590 2.94565

in. 2.91620 2.91595 2.91880 2.91855

6

Pitch Diam.

3.1233 3.1 2333.10423.08270 3.1239 3.1250 3.1256

3.1231 3.1237 3.1250 3.1256

3.1 224 3.1231 3.1250 3.1257

3.1222 3.1230 3.1250 3.1258

2.9984 2.9989 3.0000 3.0005

2.9983 2.9989 3.0000 3.0006

2.9981 2.9987 3.0000 3.0006

in. 2.9974 2.9981 3.0000 3.0007

5

Full-Form

Major Diameter

CO

W Thread-Setting Plugs

-

"

-. .. ." .

3.07710 3.07735 3.08020 3.08045

3.06270 3.06295 3.06620 3.06645

3.03260 3.03285 3.03740 3.03765

3.00450 3.00475 3.00970 3.00995

2.9607 2.9609 2.9636 2.9638

2.95210 2.95235 2.95520 2.95545

2.93770 2.93795 2.94120 2.94145

In. 2.90770 2.90795 2.91240 2.91265

9

Pitch Diam.

3.08440 3.08465 3.08440 3.08465

3.07090 3.07115 3.07090 3.07115

3,04380 3.04405 3.04380 3.04405

3.01670 3.01695 3.01670 3.01695

2.9675 2.9677 2.9675 2.9677

2.95940 2.95965 2.95940 2.95965

2.94590 2.94615 2.94590 2.94615

in. 2.91880 2.91905 2.91880 2.91 905

10

~~

Pitch Diam.

in.

3.0570 3.0564 3.0570 3.0564

3.0350 3.0344 3.0350 3,0344

2.9900 2.9893 2.9900 2,9893

2.9450 2.9442 2.9450 2.9442

2.9460 2.9455 2.9460 2.9455

2.9320 2.9314 2.9320 2.9314

2.9100 2.9094 2.9100 2.9094

2.8650 2.8643 2.8650 2.8643

3.09170 3.09145 3.08990 3.08965

3.07910 3.07885 3.07710 3.07685

3.05500 3.05475 3.05220 3.05195

3.02890 3.02865 3.02590 3.02565

2.9743 2.9741 2.9726 2.9724

2.96670 2.96645 2.96490 2.96465

2.95410 2.95385 2.95210 2.95185

in. 2.92990 2.92965 2.92710 2.92685

12

Pitch Diam.

1

11

Minor Diam.

I

38

2B

38

28

3B

28

3B

2B

38

2B

14

Class

-

3.0710 3.0704 3.0658 3.0652

3B

2B

3.0530 28 3.0524 3.0448 3B 3.0442

3.0150 28 3.0143 3.0047 3B 3.0040

2.9750 2.9742 2.9646 2.9638

2.9570 2.9565 2.9537 2.9532

2.9460 2.9454 2.9408 2.9402

2.9280 2.9274 2.9198 2.9192

in. 2.8900 2.8893 2.8797 2.8790

13

Minor Diam.

NOT CO (HI)

T

CO

I

W Thread-Setting Rings

TABLE I 1 SETTING GAGES FOR STANDARD THREAD SERIES,CLASSES, I A , 2A, 3A, IB, 2B, AND 3B LIMITS O F SIZE (CONT'D: UNIFIED SCREW THREADS

D

z

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

W

I

378-8 or 3.375-8

378-6 or 3.375-6

I

UN

UN

UN

3%12 or 3.250-12

3%16 or 3.250-16

UN

UN

31/44 or 3.250-6

3%8 or 3.250-8

UNC

31/4-4 or 3.250-4

3

2

1

t

t

T

. ..

3A

2A

3A

2A

3A

2A

3A

2A

3A

2A

C.__

3A

2A

-

3A

2A

1A

Class

Series Designation

Nominal Size and Threads/in.

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

P

r

-

In.

.>

3.3553 3.3546 3.3579 3.3572

3.3511 3.3503 3.3540 3.3532

3.2378 3.2372 3.2395 3.2389

3.2352 3.2346 3.2371 3.2365

3.2303 3.2296 3.2329 3.2322

3,2262 3.2254 3.2290 3.2282

3.29120 3.29095 3.29380 3.29355

3.26380 3.26355 3.26670 3.26645

3.20770 3.20745 3.20940 3.20915

3.19400 3.19375 3.19590 3.19565

3.16620 3.16595 3.16880 3.16855

3.13890 3.1 3865 3.14170 3.14145

3.3365 3.3358 3.3413 3.3406

3.3265 3.3257 3.3317 3.3309

3.2292 3.2286 3.2323 3.2317

3.2238 3.2232 3.2273 3.2267

3.2116 3.2109 3.2164 3.2157

3.2016 3.2008 3.2068 3.2060

3.1763 3.1754 3.1817 3.1808 3.1877 3.1868

3.3724 3.3731 3.3750 3.3757

3.3721 3.3729 3.3750 3.3758

3.2483 3.2489 3.2500 3.2506

3.2481 3.2487 3.2500 3.2506

3.2474 3.2481 3.2500 3.2507

3.2472 3.2480 3.2500 3.2508

3.2467 3.2476 3.2467 3.2476 3.2500 3.2509

in.

8

7

in.

Full-Form

Truncated

Major Diameter

NOT GO (LO)

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

"

3.3724 3.3731 3.3750 3.3757

3.3721 3.3729 3.3750 3,3758

3.2483 3.2489 3.2500 3.2506

3.2481 3.2487 3.2500 3.2506

3.2474 3.2481 3.2500 3.2507

3.2472 3.2480 3.2500 3.2508

3.08430 3.08405 3.08430 3.08405 3.08760 3.08735

in. 3.2467 3.2476 3.2467 3.2476 3.2500 3.2509

in.

Pitch Diam.

6

7-

5

3.2186 3.2177 3.2186 3.2177 3.2219 3.2210

t

T

-

4

Full-Form

Major Diameter Truncated

~

GO

W Thread-Setting Plugs

3.28240 3.28265 3.28720 3.28745

3.25430 3.25455 3.25950 3.25975

3.20210 3.20235 3.20520 3.20545

3.18770 3.18795 3.19120 3.19145

3.1 5750 3.15775 3.16230 3.16255

3.12940 3.12965 3.13460 3.1 3485

in. 3.06800 3.06825 3.07340 3.07365 3.07940 3.07965

9

Pitch Diam.

t

T ~~

GO

3.29380 3.29405 3.29380 3.29405

3.26670 3.26695 3.26670 3.26695

3.20940 3.20965 3.20940 3.20965

3.1 9590 3.19615 3.19590 3.19615

3.16880 3.16905 3.1 6880 3.16905

3.14170 3.14795 3.141 70 3.14195

3.08760 3.08785 3.08760 3.08785 3.08760 3.08785

in.

10

Pitch Diam.

~

In.

3.2400 3.2393 3.2400 3.2393

3.1950 3.1942 3.1 950 3.1942

3.1820 3.1814 3.1820 3.1814

3.1600 3.1594 3.1600 3.1594

3.1150 3.1143 3.1150 3.1143

3.0700 3.0692 3.0700 3.0692

2.9781 2.9790 2.9781 2.9790 2.9781

In.

13

Minor Diam.

3.1960 3.1954 3.1908 3.1902

3.1780 3.1774 3.1698 3.1692

3.1400 3.1393 3.1297 3.1290

3.1000 3.0992 3.0896 3.0888

3.30520 3.2650 3.30495 3.2643 3.30230 3.2547 3.30205 3.2540

3.27910 3.2250 3.27885 3.2242 3.27600 3.2146 3.27575 3.2138

3.21670 3.21645 3.21490 3.21465

3.20410 3.20385 3.20210 3.20185

3.18010 3.17985 3.17730 3.17705

3.15400 3.15375 3.15090 3.15065

3.10880 3.0170 3.10855 3.0161 3.10170 3.0170 3.10145 3.0161 3.09820 3.0094 3.09795 3.0085

in. 2,9790

12

Pitch Diam.

11

Minor Diam.

NOT GO (HI)

W Thread-Setting Rings

~~~

TABLE 11 SETTING GAGES FOR STANDARD THREAD SERIES,CLASSES, I A , 2A, 3A, IB, 2B, A N D 38 UNIFIED SCREW THREADS LIMITS OF SIZE (CONT'D)

)

T

38

28

38

2B

38

28

36

28

38

28

38

28

3B

2B

18

14

Class

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

UN

UN

UN

UN

UN

3Ih-6 or 3.500-6

3lh-8 or 3.500-8

3lh-12 or 3.500-12

3%16 or 3.500-16

378-6 or 3.625-6

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

" -

UNC

3%-4 or 3.500-4

-

UN

3%-16 or 3.375-16

" "

2A

UN

33/8-12 or 3.375-12

"

- ..

3A

2A

3A

2A

3A

2A

3A

2A

3A

2A

3A

2A

1A

-

3A

2A

-

3A

3 -

2

1

Class

Series Designation

t

t

, :

L

GO

-

3.6221 3.6229 3.6250 3.6258

3.4983 3.4989 3.5000 3.5006

3.4981 3.4987 3.5000 3.5006

3.4974 3.4981 3.5000 3.5007

3.4971 3.4979 3.5000 3.5008

3.4967 3.4976 3.4967 3.4976 3.5000 3.5009

t

3.5763 3.5755 3.5816 3.5808

3.4790 3.4784 3.4822 3.4816

3.4737 3.4731 3.4772 3.4766

3.4615 3.4608 3.4663 3.4656

3.4514 3.4506 3.4567 3.4559

3.4260 3.4251 3.4316 3.4307 3.4376 3.4367

3.3540 3.3534 3.3572 3.3566

in. 3.3487 3.3481 3.3522 3.3516

7

Truncated

T

3.50410 3.50435 3.50940 3.50965

3.45190 3.4521 5 3.45510 3.45535

3.43760 3.43785 3.441 10 3.44135

3.40740 3.40765 3.41220 3.41245

3.37920 3.37945 3.38450 3.38475

3.31770 3.31795 3.32330 3.32355 3.32930 3.32955

3.32690 3.32715 3.33010 3.33035

in. 3.31260 3.31285 3.31610 3.31635

9

Pitch Diam.

t

T

" "

3.6221 3.6229 3.6250 3.6258

3.4983 3.4989 3.5000 3.5006

3.4981 3.4987 3.5000 3.5006

3.4974 3.4981 3.5000 3.5007

3.4971 3.4979 3.5000 3.5008

3.4967 3.4976 3.4967 3.4976 3.5000 3.5009

3.3733 3.3739 3.3750 3.3756

In. 3.3731 3.3737 3.3750 3.3756

8

Full-Form

Major Diameter

NOT GO (LO)

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

-

3.51380 3.51355 3.51670 3.51645

3.45770 3.45745 3.45940 3.45915

3.44400 3.44375 3.44590 3.44565

3.41620 3.41595 3.41 880 3.41855

3.38880 3.38855 3.39170 3.39145

3.33430 3.33405 3.33430 3.33405 3.33760 3.33735

3.33270 3.33245 3.33440 3.33415

""

3.6011 3.6003 3.6040 3.6032

3.4878 3.4872 3.4895 3.4889

3.4852 3.4846 3.4871 3.4865

3.4803 3.4796 3.4829 3.4822

3.4761 3.4753 3.4790 3.4782

3.4686 3.4677 3.4686 3.4677 3.4719 3.4710

3.3733 3.3739 3.3750 3.3756

in. 3.51900 3.31875 3.32090 3.32065

in. 3.3731 3.3737 3.3750 3.3756

in. 3.3602 3.3596 3.3621 3.3615 3.3628 3.3622 3.3645 3.3639

6

Pitch Diam.

5

_"

T

T

W Thread-Setting Plugs

4

Full-Form

Major Diameter Truncated

._

T

-

Nominal Size and Threads/in.

I

.

GO

3.51670 3.51695 3.51670 3.51695

3.45940 3.45965 3.45940 3.45965

3.44590 3.44615 3.44590 3.44615

3.41880 3.41905 3.41880 3.41905

3.39170 3.39195 3.39170 3.39195

3.33760 3.33785 3.33760 3.33785 3.33760 3.33785

3.33440 3.33465 3.33440 3.33465

in. 3.32090 3.32115 3.32090 3.32115

10

Pitch Diam.

~

3.4450 3.4442 3.4450 3.4442

3.4320 3.4314 3.4320 3.4314

3.4100 3.4094 3.4100 3.4094

3.3650 3.3643 3.3650 3.3643

3.3200 3.3192 3.3200 3.31 92

3.2290 3.2281 3.2290 3.2281 3.2290 3.2281

3.3070 3.3064 3.3070 3.3064

in. 3.2850 3.2844 3.2850 3.2844

11

Minor Diam.

3.4750 3.4742 3.4646 3.4638

3.4460 3.4454 3.4408 3.4402

3.4280 3.4274 3.4198 3.4192

3.3900 3.3893 3.3797 3.3790

3.3500 3.3492 3.3396 3.3388

3.2670 3.2661 3.2670 3.2661 3.2594 3.2585

3.3210 3.3204 3.3158 3.3152

in. 3.3030 3.3024 3.2948 3.2942

13

Minor Diam.

-

"

3.52930 3.52905 3.52620 3.52595

3.46690 3.46665 3.46500 3.46475

3.45430 3.45405 3.45220 3.451 95

3.43030 3.43005 3.42740 3.42715

3.40420 3.40395 3.40110 3.40085

3,35910 3.35885 3.35190 3.35165 3.34840 3.34815

3.34190 3.34165 3.34000 3.33975

in. 3.32930 3.32905 3.32720 3.32695

12

Pitch Diam.

NOT GO (HI)

-

T

~~~

.)

W Thread-Setting Rings

TABLE 11 SETTING GAGES FOR STANDARD THREAD SERIES,CLASSES, lA, 2A, 3A, lB, PB, AND 3B UNIFIED SCREWTHREADS LIMITS OF SIZE (CÖNT~D) .

)

3B

2B

3B

28

38

2B

3B

2B

3B

2B

3B

2B

?B

3B

28

3B

28

14

Class

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

ASME B I - 2 8 3 W 2 5 7 5 5 3 2 0033777 7

GAGESANDGAGING FOR UNIFIEDINCHSCREWTHREADS

ANSI/ASME B1.2-1983 ANAMERICANNATIONALSTANDARD

VI

4

U

m

N

%

n m ~m

m

m

~m

W %

m

m ~m

m

m

m

O w w N

L

r o m m

gg ?E

RRZZ mmmm o m o m m ~ w

m

:V?:? O O h h

w w h h

g m m m m

o w o w h W h W m m m m

m m m m

m m m m

o m o m o m o m Y B Y Y

o m o m w w r m ( V N W W w w w w L????

x-!xx

m m m m

o w w w

m o m w

o m w m w w

m o

: : W ? : o m o m m r r m r N m m 0 0 0 0 hhhh

o m o m

m r r m

W

h

0

hhhh

m m m m

o m o m w m w m

o m o m h W h W

!lz!lz

o m o m m w o h w w m w r r r r

o w o w

O N O N

L?YL"v!

o m o m

0

h h w w L?L?L?v! m m m m

m m m m

r h o w w w o o w w m m

hhhh

m m m m

~ w w m r o w m 0 0 0 0

h h h h

mmmm

mmmm o m o m

h X3F w m m m m m m m mmmm

o m o m o m o m o m m h d ~ m ~ m ww m w r r w m w m h h c o m m c ~ m m m m w w w w w w m m m m m m

o m o v ) r w w m w m w m w w w w

o o w m

m h m m

o m m w m m

m m

mmmmmm

m m o u m m m v

m o o h ~ m m m

N N N N W W W I C

2 N N N N

.-wwwq

m m m w

N w r m

o m m r

rot-r

"

f-7 4

m

L

3

$

4

m

Z 3

z

V

Z

2

3

z

3

z

2

8m 2 L

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

a

I I6 Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

Z 3

5 Z 3

UN

4-8 or 4.000-8

UNC

UN

!

UN

UN

3A

2A

3A

2A

3A

2A

1A

3A

2A

3A

2A

3A

2A

3A

5

Full-Form

3.9802 3.9795 3.9829 3.9822

3.9760 3.9752 3.9790 3.9782

3.9685 3.9676 3.9685 3.9676 3.9719 3.9710

3.91 610 3.91585 3.91880 3.91855

3.88870 3.88845 3.89170 3.89145

3.83420 3.83395 3.83420 3.83395 3.83760 3.83735

3.83260 3.83235 3.83440 3.83415

3.81890 3.81865 3.82090 3.82065

3.79110 3.79085 3.79380 3.79355

in. 3.76370 3.76345 3.76670 3.76645

6

Pitch Diam.

t

T

3.9611 3.9604 3.9661 3.9654

3.9510 3.9502 3.9565 3.9557

3.9255 3.9246 3.9312 3.9303 3.9374 3.9365

3.8538 3.8532 3.8571 3.8565

3.8485 3.8479 3.8521 3.8515

3.8361 3.5354 3.8411 3.8404

in. 3.8260 3.8252 3.8315 3.8307

7

Truncated

" "

3.9973 3.9980 4.0000 4.0007

3.9970 3.9978 4.0000 4.0008

3.9966 3.9975 3.9966 3.9975 4.0000 4.0009

3.8732 3.8738 3.8750 3.8756

3.8730 3.8736 3.8750 3.8756

3.8723 3.8730 3.8750 3.8757

In. 3.8720 3.8728 3.8750 3.8758

8

Full-Form

Major Diameter

NOT GO (LO)

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

3.9973 3.9980 4.0000 4.0007

3.9970 3.9978 4.0000 4.0008

3.9966 3.9975 3.9966 3.9975 4.0000 4.0009

3.8627 3.8732 3.8621 3.8738 3.8645 3.8750 3.8639 3.8756

3.8601 3.8730 3.8595 3.8736 3.8621 3.8750 3.8615 3.8756

3.8552 3.8723 3.8545 3.8730 3.8579 3.8750 3.8572 3.8757

in. in. 3.8510 3.8720 3.8502 3.8728 3.8540 3.8750 3.8532 3.8758

4

3

2A

Truncated

Major Diameter Class

t GO

W Thread-Setting Plugs

-

.

--

3.90700 3.90725 3.91200 3.91225

3.87880 3.87905 3.88430 3.88455

3.81720 3.81745 3.82290 3.82315 3.82910 3.82935

10

Pitch Diam.

3.82090 3.821 15 3.82090 3.82115

3.79380 3.79405 3.79380 3.79405

3.83440 3.83465 3.83440 3.83465

3.91880 3.91905 3.91880 3.91905

3.89170 3.89195 3.89170 3.89195

3.83760 3.83785 3.83760 3.83785 3.83760 3.83785

) ,

3.8650 3.8643 3.8650 3.8643

3.8200 3.81 92 3.8200 3.8192

3.7290 3.7281 3.7290 3.7281 3.7290 3.7281

3.8070 3.8064 3.8070 3.8064

3.7850 3.7844 3.7850 3.7844

3.7400 3.7393 3.7400 3.7393

in. 3.6950 3.6942 3.6950 3.6942

C__

11

.__

Minor Diam.

3.93070 3.93045 3.92770 3.92745

3.90460 3.90435 3.90140 3.90115

3.85970 3.85945 3.85230 3.85205 3.84870 3.84845

3.84200 3.84175 3.84010 3.83985

3.82940 3.82915 3.82730 3.82705

3.80560 3.80535 3.80260 3.80235

in. 3.77950 3.77925 3.77630 3.77605

12

Pitch Diam.

" "

T ~

3.8900 3.8893 3.8797 3.8790

3.8500 3.8492 3.8396 3.8388

3.7670 3.7661 3.7670 3.7661 3.7594 3.7585

3.8210 3.8204 3.8158 3.8152

3.8030 3.8024 3.7948 3.7942

3.7650 3.7643 3.7547 3.7540

in. 3.7250 3.7242 3.7146 3.7138

13

Minor Diam.

NOT GO (HI)

W Thread-Setting Rings

GO

in. 3.76670 3.76695 3.76670 3.76695

"

3.82670 3.82695 3.83000 3.83025

3.81240 3.81265 3.81600 3.81625

3.78200 3.78225 3.78700 3.78725

In. 3.75380 3.75405 3.75930 3.75955

9

Pitch Diam.

t

T

TABLE 11 SETTING GAGES FOR STANDARD THREAD SERIES,CLASSES, I A , 2A, 3A, lB, 2B, A N D 3B UNIFIED SCREW THREADS LIMITS O F SIZE (CONT'D)

4-6 or 4.000-6

4-4 or 4.000-4

37/8-16 or 3.875-16

37/8-12 or 3.875-12

378-6 or 3.875-6

SeriesSize Nominal

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

-

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

3B

28

38

2B

38

2B

1B

38

28

38

2B

3B

2B

38

2B

14

Class

UN

UN

UN

4-16 or 4.000-16

4 1 ~ ~ or - 6 4.125-6

4l/8-12 or 4.125-12

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

1 ._.."

3A

2A

3A

2A

3A

2A

3A

2A

3A

2A

3A

2A

3A

2A

3A

.....-

*)

4.2351 4.2342 4.2371 4.2362

4.2260 4.2247 4.2290 4.2277

4,2185 4.2170 4.221 9 4.2204

4.1 127 4.1118 4.1145 4.1136

4.1 101 4.1 092 4.1 121 4.1112

4.1010 4.0997 4.1040 4.1027

3.9877 3.9871 3.9895 3.9889

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

4.2235 4.2480

4.1387 4.2008 4.2470 4.1384 4.1995 4.2483 4.1417 4.2064 4.2500 4.1414 4.2051

4.2513

4.1038 4.1232 4.0826 4.0823 4.1 029 4.1241 4.0844 4.1071 4.1250 4.1062 4.0841 4.1259

4.1874 4.1 877 4.1 910 4.1913

4.1286 4.1289 4.1342 4.1345

4.0727 4.0730 4.0790 4.0793

4.0767 4.0770 4.0800 4.0803

4.0624 4.0627 4.0660 4.0663

4.0037 4.0040 4.0092 4.0095

3.95170 3.95195 3.95500 4.0006 3.9815 3.95525

4.0985 4.1230 4.0689 4.0976 4.0686 4.1239 4.0709 4.1021 4.1250 4.1012 4.0706 4.1259

4.0842 4,1810 4,2466 4.1795 4.2481 4.0839 4.1873 4.2500 4.0876 4.0873 4.1858 4.2515

9

Pitch Diam.

in. rn. 3.93740 3.9980 3.9986 3.9729 3.93765 3.94100 4.0000 , 4.0006 3.9765 3.94125

8

Full-Form

4.0759 4.1 220 4.0137 4.0134 4.0746 4.1233 4.0814 4.0167 4.1250 4.0801 4.1263 4.0164

3.95760 3.9788 3.9982 3.95735 3.9782 3.9988 3.95940 3.9821 4.0000 3.95915

4.2480 4.1939 4.2489 4.2500 4.25094.2262 4.1936 4.2509

4.2470 4.2483 4.2500 4.2513

4.2466 4.2481 4.2500 4.2515

4.1232 4.1 241 4.1250 4.1259

4.1230 4.1239 4.1 250 4.1259

4.1220 4.1 233 4.1250 4.1263

3.9982 3.9988 4.0000 4.0006

In. 3.9735

in.

in. 3.9980 3.9986 4.0000 4.0006

In. 3.9851 3.9845 3.9871 3.9865

3.9771

7

6

5

4

3.94390 3.94365 3.94590 3.94565

Truncated

3

NOT GO (LO) Major Diameter

Diam.

T Pitch

1

W Thread-Setting Plugs

Full-Form

Truncated

2A

GO Major Diameter

Class

1

1

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

UN

UN

4%6 or 4.250-6

4%12 or 4.250-12

UN

4'/4-4 OT 4.250-4

4%-16 or 4,125-16

_1__

UN

Designation

4-12 or 4.000-12

Nominal SeriesSize and Threaddin.

-

ID.

10

Pitch Diam.

4.1959 4.1962 4.1959 4.1962

4.1417 4.1420 4.1417 4.1420

4,0876 4.0879 4.0876 4.0879

4.0844 4.0847 4.0844 4.0847

4.0709 4.0712 4.0709 4.0712

4.0167 4.0170 4.0167 4.0170

3.95940 3.95965 3.95940 3.95965

4.1600 4.1591 4.1600 4.1591

4.0700 4.0687 4.0700 4.0687

3.9790 3.9775 3.9790 3.9775

4.0570 4.0561 4.0570 4.0561

4.0350 4.0341 4.0350 4.0341

3.9450 3.9437 3.9450 3.9437

3.9320 3.9314 3.9320 3.9314

3.9100 3.9094 3.9100 3.9094

In.

11

Minor Diam.

T

4.2044 4.2041 4.2023 4.2020

4.1 548 4.1545 4.1515 4.1512

4.1025 4.1022 4.0988 4.0985

4.0920 4.0917 4.0901 4.0898

4.0794 4.0791 4.0773 4.0770

4.0297 4.0294 4.0264 4.0261

3.96700 3.96675 3.96510 3.96485

In. 3.95440 3.95415 3.95230 3.95205

12

Pitch Diam.

1

"

4.1780 4.1771 4.1698 4.1689

4.1 000 4.0987 4.0896 4.0883

3B

2B

3B

2B

3B

2B

3B

28

38

2B

3B

2B

38

2B

3B

2B

14

Class

I

-

4.0170 4.0155 4.0094 4.0079

4.0710 4.0701 4.0658 4.0649

4.0530 4.0521 4.0448 4.0439

3.9750 3.9737 3.9646 3.9633

3.9460 3.9454 3.9408 3.9402

3.9280 3.9274 3.9198 3.9192

In.

13

Minor Diam.

NOT GO (HI)

W Thread-Setting Rings GO

3.94590 3.94655 3.94590 3.94615

t

T

TABLE 11 SETTING GAGES FOR STANDARD THREAD SERIES,CLASSES, l A , 2A, 3A, lB, 2B, A N D 3B LIMITS OFSIZE (CONT'D) UNIFIED SCREW THREADS

' .

-

UN

4%-6 o r 4.375-6

"

,

. -.

I

UN

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

.

I

UN

4'12-6 or 4.500-6

41/2-12 or 4.500-12

UN

4%-4 or 4.500-4

43/8-16 or 4.375-16

43/8-12 or 4.375-12

1

in.

in.

2A 4.4851 4.4842 3A 4,4871 4.4862

-.

"-

4.4735 4.4726 4,4771 4.4762

4.4506 4.4493 4.4562 4.4549

4.4980 4.4989 4.5000 4.5009

4.4969 4.4982 4.5000 4.5013

4.4965 4.4980 4.5000 4.5015

4.3732 4.3741 4.3750 4.3759

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

"

4.4439 4.4436 4.4459 4.4456

4.3886 4.3883 4.3917 4.3914

4.4969 4.4982 4.5000 4.5013

2A 4.4759 4.4746 4.4790 3A 4.4777

3A

4.4684 4.4669 4.4719 4.4704

4.3627 4.3618 4.3645 4.3636

4.4980 4.4989 4.5000 4.5009

4.3341 4.3338 4.3376 4.3373

4.4965 4.4980 4.5000 4.501 5

2A

3A

2A

3A

4.4308 4.4293 4.4372 4.4357

4.3538 4.3529 4.3571 4.3562

4.3326 4.3323 4.3344 4.3341

4.3732 4.3741 4.3750 4.3759

4.3730 4.3739 4.3750 4.3759

4.3485 4.3476 4.3521 4.3512

4.3189 4.31 86 4.3209 4.3206

4.3730 4.3739 4.3750 4.3759

4.3601 4.3592 4.3621 4.3612

2A

4.3720 4.3733 4.3750 4.3763

4.3258 4.3245 4.3313 4.3300

4.2637 4.2634 4.2667 4.2664

4.2288 4.2279 4.2321 4.2312

4.2482 4.2491 4.2500 4.2509

in.

8

full-Form

4.2076 4.2073 4.2094 4.2091

in.

7

4.3720 4.3733 4.3750 4.3763

'

4.2377 4.2368 4.2395 4.2386

in.

6

5

4

Truncated

-.

T

NOT GO (LO) Major Diameter

2A 4.3510 4.3497 3A 4.3540 4.3527

3A

2A

3

4.2482 4.2491 4.2500 4.2509

Pitch Diam.

T

W Thread-Setting Plugs

Full-Form

Major Diameter

Class Truncated

UN " F

UN

41/4-16 or 4.250-16

I

T

7t" i

Nominal Size

1

4.2094 4.2097 4.2094 4.2097

in.

10

4.4374 4.4377 4.4410 4.4413

4.3784 4.3787 4.3840 4.3843

4.4459 4.4462 4.4459 4.4462

4.3917 4.3920 4.3917 4.3920

4.3225 4.3376 4.3228 4.3379 4.3289 4.3376 4.3292 4.3379

4.3267 4.3344 4.3270 4.3347 4.3300 4.3344 4.3303 4.3347

4.3124 4.3209 4.3127 4.3212 4.3160 4.3209 4.3163 4.3212

4.2536 4.2667 4.2670 4.2539 4.2591 4.2667 4.2670 4.2594

4.2017 4.2020 4.2050 4.2053

in.

9

Pitch Pitch Diam. Diam.

I

GO

4.4100 4.4091 4.4100 4.4091

4.3200 4.3187 4.3200 4.3187

4.2290 4.2275 4.2290 4.2275

4.3070 4.3061 4.3070 4.3061

4.2850 4.2841 4.2850 4.2841

4.1 950 4.1937 4.1950 4.1937

4.1820 4.1811 4.1820 4.1811

In.

11

Minor Diam.

4.4544 4.4541 4.4523 4.4520

4.4050 4.4047 4.4016 4.4013

4.3527 4.3524 4.3489 4.3486

4.3420 4.3417 4.3401 4.3398

4,3294 4.3291 4.3273 4.3270

-

4.2799 4.2796 4.2766 4.2763

4.2170 4.21 67 4.2151 4.2148

in.

I_c

12

_L_

Pitch Diilm.

-

W Thread-Setting Rings

TABLE 11 SElTlNC GAGES FOR STANDARD THREAD SERIES,CLASSES, lA, ZA, 3A, lB, 2B, AND 38 UNIFIED SCREW THREADS LIMITS OF SIZE (CONT'D)

1

3B

2B

38

28

38

28

4,4280 4.4271 4.4198 4.4189

3B

2B

4.3500 2B 4.3487 4.3396 3B 4.3383

4.2670 2B 4.2655 4.2594 3B 4.2579

4.3210 4.3201 4.3158 4.3149

4.3030 28 4.3021 4.2948 3B 4.2939

4.2250 4.2237 4.2146 4.2133

4.1960 4.1951 4.1908 4.1899

in.

Minor

x

% % u w

131.

2:

z$J

gg 3 ' 0

0

D

5a

55

-D

0'"

;E

ZD

C D

4.6872 4.6875 4.6909 4.6912 4.7480 4.7489 4.7500 4.7509 4.7233 4.7224 4.7270 4.7261 4.6939 4.6936 4.6959 4.6956

4.7480 4.7489 4.7500 4.7509

2A 4.7351 4.7342 4.7371 3A 4.7362

UN

474-1 2or 4.750-1 3

3A

2A

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

4.6283 4.6286 4.6340 4.6343 4.7469 4.7482 4.7500 4.7513 4.7005 4.6992 4.7062 4.7049 4.6386 4.6383 4.6417 4.6414

4.7469 4.7482 4.7500 4.7513

4.7259 4.7246 4.7290 4.7277

UN

43/46 or 4.750-6

-

4.5724 4.5727 4.5788 4.5791

4.7465 4.7480 4.7500 4.7515 4.6807 4.6792 4.6871 4.6856 4.5841 4.5838 4.5876 4.5873

4.7465 4.7480 4.7500 4.7515

2A

UN

4Y4-4 or 4.7.50-4 3A

4.5765 4.5768 4.5799 4.5802

4.6232 4.6241 4.6250 4.6259 4.6036 4.6027 4.6070 4.6061

4.5826 4.5823 4.5844 4.5841

4.6232 4.6241 4.6250 4.6259

2A 4.6127 4.61 18 4.6145 3A 4.6136

UN

45/8-16 or 4.625-16

4.7184 4.7169 4.7219 4.7204

4.5622 4.5625 4.5659 4.5662

4.6230 4.6239 4.6250 4.6259

4.5983 4.5974 4.6020 4.6011

4.5689 4.5686 4.5709 4.5706

4.6230 4.6239 4.6250 4.6259

2A 4.6101 4.6092 4.6121 3A 4.6112

38

28

38

28

4.6959 4.6600 4.7046 4.6962 4.6591 4.7043 4.7025 4.6600 4.6959 4.6962

4.6417 4.5700 4.6551 4.5687 4.6420

28 4.6780 4.6771 3B 4.6698 4.6689 4.7022 4.6591

4.6000 28 4.5987 4.6548 38 4.5700 4.6417 4.5896 4.6518 4.5883 4.6515 4.5687 4.6420

2B 4.6029 4.5170 4.5876 4.4790 4.4775 4.6026 4.5879 4.5155 4.5094 3B 4.5876 4.5990 4.4790 4.5079 4.5987 4.5879 4.4775

4.5923 4.5710 4.5844 4.5570 4.5561 4.5920 4.5701 4.5847 4.5658 4.5570 4.5903 4.5844 4.5649 4.5847 4.5561 4.5900

4.5350 4.5796 4.5530 4.5709 4.5341 4.5793 4.5521 4.5712 4.5448 4.5350 4.5775 4.5709 4.5439 4.5712 4.5341 4.5772

4.4750 28 4.4450 4.5300 4.5167 4.4737 4.4437 4.5297 4.5170 4.4646 3B 4.5167 4.4450 4.5267 4.4633 4.5264 4.4437 4.5170

4.5033 4.5036 4.5090 4.5093

4.6219 4.6232 4.6250 4.6263

4.5755 4.5742 4.5812 4.5799

4.5136 4.5133 4.5167 4.5164

UN

4.6009 4.5996 4.6040 4.6027

45/8-12 o r 4.625-12

" " 1 - "

L

3A

2A

4.6219 4.6232 4.6250 4.6263

UN

3A

in.

4.4460 2B 4.4320 4.4670 4.4594 4.4451 4.4597 4.4311 4.4667 4.4408 4.4651 4.4320 4.4594 3B 4.4311 4.4399 4.4597 4.4648

in.

4.4517 4.4520 4.4550 4.4553

In.

14

Class

-

4.4982 4.4991 4.5000 4.5009

in.

13

Minor Diam.

In.

12

Pitch Diam.

4.4788 4,4779 4.4821 4.4812

in.

11

Minor Diam.

NOT GO (HI)

4.4576 4.4573 4.4594 4.4591

45/64 or 4.625-6

In.

in.

in.

GO

W Thread-Setting Rings

4.4982 4.4991 4.5000 4.5009

In.

4.4877 4.4868 4.4895 4.4886

2A

UN

4lh-16 or 4.500-16

10

9

a

7

6

Pitch Diam.

5

4

3

1

2

1

Full-Form

Diam.

T Pitch

Full-Form

Major Diameter

NOT GO (LO)

r t

Truncated

T Pitch t

-r

W Thread-Setfing Plugs

Diam.

Major Diameter Truncated

Series Designation Class

Nominal Size and Threads/in.

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

I

TABLE 11 SETTING GAGES FOR STANDARD THREAD SERIES,CLASSES, lA, 2A, 3A, l B , 28, AND 3B UNIFIED SCREW THREADS - LIMITS OF SIZE (CONT'D)

I

Class

UN

UN

UN

I

I

II

3A

2A

2A 3A

2A

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

I

I

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

5-12 or 5.000-12

5-6 or 5.000-6

5-4 or 5.000-4

47/8-16 or 4.875-16

43/4-16 or 4.750-16

.&9

Truncated

Full-Form

Major Diameter

GO

in.

in.

4.9733 4.9724 4.9770 4.9761

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

4.9439 4.9436 4.9459 4.9456

4.9503 4.9490 4.9561 4.9548

4.8886 4.8883 4.8917 4.8914

4.9759 4.9969 4.9746 4.9982 5.0000 4.9790 4.9777 5.0013 4.9980 4,9851 4.9989 4.9842 4.9871 5.0000 4.9862 5.0009

4.9304 4.9289 4.9370 4.9355

4.8536 4.8527 4.8570 4.8561

4.8326 4.8323 4.8344 4.8341

4.8627 4.8732 4.8741 4.861 8 4.8750 4.8645 4.8759 4.8636 4.8340 4.8337 4.8376 4.8373

4.8483 4.8474 4,8520 4.8511

4.81 89 4.8186 4.8209 4.8206

4.8601 4.8730 4.8739 4.8592 4.8750 4.8621 4.8612 4.8759

4.9683 4.9964 4.9668 4.9979 5.0000 4.971 9 4.9704 5.0015

4.8254 4.8241 4.8311 4.8298

4.7286 4.7277 4.7320 4.731 1

In.

7

Truncated

4.9980 4.9985 5.0000 5.0009

4.9969 4.9982 5.0000 5.0013

4.9964 4.9979 5.0000 5.0015

4.9372 4.9375 4.9409 4.9412

4.8781 4.8784 4.8839 4.8842

4.8221 4.8224 4.8287 4.8290

4.8265 4.8268 4.8299 4.8302

4.8122 4.8125 4.8159 4.8162

4.8730 4.8739 4.8750 4.8759 4.8732 4.8741 4.8750 4.8759

4.7532 4.7535 4.7589 4.7592

in. 4.7015 4.7018 4.7049 4.7052

9

Diam.

4.8719 4.8732 4.8750 4.8763

in. 4.7482 4.7491 4.7500 4.7509

8

Full-Form

T Pitch

NOT GO (LO) Major Diameter

4.7636 4.7633 4.7667 4.7664

"

4.7076 4.7073 4.7094 4.7091

in.

6

t

4.8509 4.8719 4.8496 4.8732 4.8750 4.8540 4.8527 4.8763

.4.73/7 4.7482 4.7491 4.7368 4.7395 4.7500 4.7386 4.7509

5

4

Pitch Diam.

T

W Thread-Setting Plugs

1

Nominal Size Series and Threads/in. Designation

I

-

ti'

t

T

4.9459 4.9462 4.9459 4.9462

4.8917 4,8920 4.8917 4.8920

4.8376 4.8379 4.8376 4.8379

4.8344 4.8347 4.8344 4.8347

4.8209 4.8212 4.8209 4.8212

4.7667 4.7670 4.7667 4.7670

In. 4.7094 4.7097 4.7094 4.7097

10

Pitch Diam.

CO

4.91 00 4.9091 4.9100 4.9091

4.8200 4.8187 4.8200 4.8187

4.7290 4.7275 4.7290 4.7275

4.8070 4.8061 4.8070 4.8061

4.7850 4.7841 4.7850 4.7841

4.6950 4.6937 4,6950 4.6937

4.6820 4.6811 4.6820 4.6811

In.

11

Minor Diam.

4.7173 4.6960 4.7170 4.6951 4.7153 4.6908 4.7150 4.6899

In.

13

12

in.

Minor Diam.

Pitch Diam.

NOT GO (HI)

4.8210 4.8201 4.8158 4.8149

-

-

4.9546 4.9280 4.9271 4.9543 4.9525 4.9198 4.9522 4.9189

4.9053 4.8500 4.9050 4.8487 4.8396 4.901 9 4.9016 4.8383

4.8530 4.7670 4.8527 4.7655 4.8492 4.7594 4.8489 4.7579

4.8423 4.8420 4.8403 4.8400

4.8296 4.8030 4.8293 4.8021 4.8275 4.7948 4.8272 4.7939

4.7802 4.7250 4.7799 4.7237 0.7768 4.7146 4.7765 4.7133

T

W Thread-Setting Rings

TABLE 11 SETTING GAGES FOR STANDARD THREAD SERIES,CLASSES, lA, 2A, 3A, lB, 2B, AND 3B UNIFIED SCREW THREADS LIMITS OF SIZE (CONT'D)

t

38

28

3B

28

3B

2B

3B

28

3B

2B

38

2B

38

2B

14

Class

5l/+12 or 5.250-12

5%-6 or 5.250-6

5V4-4 or 5.250-4

51/8-12 or 5.125-12

I 2A

UN

3A

2A

3A

2A

1

I

I

I

I :: I I

UN

UN

3

Class

I I

1

I

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

C

UN

2

1

5-16 O Y 5.000-16

Series Designation

Nominal Size and Threads/in.

:

GO

5.2351 5.2342 5.2371 5.2362

5.2258 5.2245 5.2290 5.2277

L

5.2233 5.2224 5.2270 5.2261

5.2480 5.2489 5.2500 5.2509

5.2468 5.2481 5.2500 5.2513

5.2001 5.1988 5.2060 5.2047

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

5.2480 5.1939 5.2489 5.1936 5.2500 5.1959 5.1956 5.2509

5.2468 5.1385 5.2481 5.1382 5.1417 5.2500 5.1414 5.2513

5.1 872 5,1875 5.1909 5.1912

5.1279 5.1 282 5.1338 5.1 341

5.0720 5.0723 5.0786 5.0789

5.0765 5.0768 5.0799 5.0802

5.1232 5.1241 5.1250 5.1259 5.2464 5.2479 5.2500 5.2515

5.1036 5.1027 5.1070 5.1061

5.0826 5.0823 5.0844 5.0841

5.0622 5.0625 5.0659 5.0662

5.0030 5.0033 5.0088 5.0091

5.1 230 5.1239 5.1250 5.1259

5.1218 5.1231 5.1250 5.1263

?i3. 4.9515 4.9518 4.9549 4.9552

In.

, 9

Diam.

T Pitch

4.9982 4.9991 5,0000 5.0009

a

Full-Form

5.1803 5.1788 5.1869 5.1854

5.0983 5.0974 5.1020 5.1011

5.0689 5.0686 5.0709 5.0706

5.0840 5,2464 5.0837 5.2479 5.2500 5.0876 5.2515 5.0873

5.1232 5.1241 5.1250 5.1259

5.1127 5.1 118 5.1145 5.1136 5.2183 5.2168 5.2219 5.2204

5.1230 5.1239 5.1250 5.1259

5.0752 5.0739 5.0810 5.0797

5.0335 5.0132 5.0167 5.0164

5.1218 5.1231 5.1250 5.1263

5.1008 5.0995 5.1040 5.1027

In.

4.9786 4.9777 4.982@ 4.9811

in. 4.9576 4.9573 4.9594 4.9591

4.9982 4.9991 5.0000 5.0009

in.

Truncated 7

5.1 101 5.1092 5.1121 5.1112

NOT GO (LO) Major Diameter

6

t

5

Full-Form

Pitch Diam.

T

in. 4.9877 4.9868 4.9895 4.9886

4

I

Major Diameter Truncated

T

+

5.1959 5.1962 5.1959 5.1962

5.1417 5.1420 5.1417 5.1420

5.0876 5.0879 5.0876 5.0879

5.0844 5.0847 5.0844 5.0847

5.0709 5.0712 5.0709 5.0772

5.0167 5.0170 5.0167 5.0170

In. 4.9594 4.9597 4.9594 4.9597

10

Pitch Diam.

in. 4.9320 4.9311 4.9320 4.9311

11

5.1600 5.1591 5.1600 5.1591

5.0700 5.0687 5.0700 5.0687

4.9790 4.9775 4.9790 4.9775

5.0570 5.0561 5.0570 5.0561

5.0350 5.0341 5.0350 5.0341

4.9450 4.9437 4.9450 4.9437

'

12

Pitch Diam.

13

Minor Diam.

NOT GO (HI)

5.0710 5.0701 5.0658 5.0649

3B

28

14

Class

-

3B

26

-

38

2B

-

38

26

-

36

2B

36

26

-

3B

28

-

T

-

5.2046 5.1780 5.2043 5.1771 5.2025 5.1698 5.1689 5.2022

5.1000 5.1555 5.0987 5.1552 5.1520 5.0896 5.1517 5.0883

5.1032 5.0170 5.1029 5.0155 5.0993 5.0094 5.0990 5.0079

5.0923 5.0920 5.0903 5.0900

5.0796 5.0530 5.0521 5.0793 5.0775 5.0448 5.0772 5.0439

5.0304 4.9750 5.0301 4.9737 5.0270 4.9646 5.0267 4.9633

in. in. 4.9673 4.9460 4.9670 4.9451 4.9653 4.9408 4.9650 4.9399

-

Minor Diam.

_f_

GO

TABLE 11 SETTING GAGES FOR STANDARD THREAD SERIES,CLASSES, I A , 2A, 3A, IB, 28, A N D 3B UNIFIED SCREW THREADS - LIMITS OFSIZE (CONT'D) I I W Thread-Setting Rings W Thread-Setting Plugs

.>

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

I

51/2-12 or 5.500-12

51/24 or 5.500-6

I

I

UN

UN

UN

UN

5%-16 or 5.375-16

51/2-4,or 5.500-4

UN

UN

578-6 or 5.375-6

5%-12 or 5.375-12

UN

2

1

51/4-16 or 5.250-16

Series Designation

3A

2A

3A

2A

3A

2A

-

3A

2A

-

3A

2A

3A

2A

3A

2A

3

-

-

Class

_"

C

T

-

in. 5.2482 5.2491 5.2500 5.2509

in. 5.2377 5.2368 5.2395 5.2386

--

"

5.4851 5.4842 5.4871 5.4862

5.4758 5.4745 5.4790 5.4777

5.4683 5:4668 5.4719 5.4704

5.3627 5.361 8 5.3645 5.3636

5.3601 5.3592 5.3621 5.3612

T

5.3885 5.3882 5.3917 5.3914

5.3340 5.3337 5.3376 5.3373

5.3326 5.3323 5.3344 5.3341

5.3189 5.3186 5.3209 5.3206

5.2635 5.2632 5,2667 5.2664

in. 5.2076 5.2073 5.2094 5.2091

-,

_. ".

6

Pitch Diam.

5.4439 5.4436 5.4459 5.4456

-"_

5.4733 5.4724 5.4770 5.4761

5.4500 5.4487 5.4559 5.4546

5.4302 5.4287 5.4368 5.4353

5.3536 5.3527 5.3570 5.3561

5.3483 5.3474 5.3520 5.3511

5.3251 5.3238 5.3309 5.3296

in. 5.2286 5.2277 5.2320 5.2311

7

Truncated

5.4980 5.4989 5.5000 5.5009

5.4968 5.4981 5.5000 5.5013

5.4964 5.4979 5.5000 5.5015

5.3732 5.3747 5.3750 5.3759

5.3730 5.3739 5.3750 5.3759

5.3718 5.3731 5.3750 5.3763

in. 5.2482 5.2491 5.2500 5.2509

8

Full-Form

Major Diameter

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

5.4980 5.4989 5.5000 5.5009

t

5.4372 5.4375 5.4409 5.4412

5.3778 5.3781 5.3837 5.3840

5.3219 5.3222 5.3285 5.3288

5.3265 5.3268 5.3299 5.3302

5.3122 5.3125 5.3159 5.3162

5.2529 5.2532 5.2587 5.2590

in. 5.2015 5.2018 5.2049 5.2052

9

Diam.

1 Pitch

NOT GO (LO)

I

"

5.4968 5.4981 5.5000 5,5013

5.4964 5.4979 5.50UO 5.5015

5.3732 5.3741 5.3750 5.3759

5.3730 5.3739 5.3750 5.3759

5.3718 5,3731 5.3750 5.3763

5

4

5.3508 5.3495 5.3540 5.3527

Full-Form

Truncated

Major Diameter

GO

W Thread-Setting Plugs

-

10

Pitch Diam.

5.4459 5.4462 5.4459 5.4462

5.3917 5.3920 5.3917 5.3920

5.3376 5.3379 5.3376 5.3379

5.3344 5.3347 5.3344 5.3347

5.3209 5.3212 5.3209 5.3212

5.2667 5.2670 5.2667 5.2670

in. 5.2094 5.2097 5.2094 5.2097

t

T

-

GO

5.4100 5.4091 5.4100 5.4091

5.3200 5.3187 5.3200 5.3187

5.2290 5.2275 5.2290 5.2275

5.3070 5.3061 5.3070 5.3061

5.2850 5.2841 5.2850 5.2841

5.1950 5.1937 5.1950 5.1937

in. 5.1820 5.1811 5.1820 5.1811

11

Minor Diam.

5.3534 5.3531 5.3494 5.3491

5.3423 5.3420 5.3403 5.3400

5.3296 5.3293 5.3275 5.3272

5.2805 5.2802 5.2771 5.2768

5.2173 5.2170 5.2153 5.2150

In.

12

Pitch Diam.

5.4546 5.4543 5.4525 5.4522

5.4280 5.4271 5.4198 5.4189

5.3500 5.3487 5.3396 5.3383

5.2670 5.2655 5.2594 5.2579

5.3210 5.3201 5.3158 5.3149

5.3030 5.3021 5.2948 5.2939

5.2250 5.2237 5.2146 5.2133

in. 5.1960 5.1951 5.1908 5.1899

13

Minor Diam.

NOT GO (HI)

5.4056 5.4053 5.4021 5.4018

T

W Thread-Setting Rings

TABLE 11 SETJING GAGES FOR STANDARD THREAD SERIES,CLASSES, lA, 2A, 3A, lB, PB, A N D 3B UNIFIED SCREW THREADS LIMITS O F SIZE (CONT'D)

Nominal Size and Threadsh.

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

-

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

38

2B

3B

2B

3B

28

3B

2B

38

28

3B

28

38

28

14

Class

"

1

T

UN

UN

UN

UN

5%-6 or 5.625-6

55/8-12 or 5.625-12

55/8-16 or 5.625-16

574-4 or 5.750-4

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

5%-6 or 5.750-6

UN

2A

UN

5V.z-I6 or 5.500-16

-.

3

2

1

3A

2A

3A

2A

3A

2A

3A

2A

3A

2A

3A

Class

Series Designation

I

Nominal Size and Threads/in.

I

5.6218 5.6231 5.6250 5.6263

5.4982 5.4991 5.5000 5.5009

5

8

In.

7

in. in.

6

in.

5.6417 5.6420 5.6417 5.6420

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5.6999 5.7468 5.7468 5.6385 5.6986 5.7481 5.7481 5.6382 5.6417 5.7058 5.7500 5.7500 5.6414 5.7045 5.7513 5.7513

5.6277 5.6280 5.6336 5.6339

5.7258 5.7245 5.7290 5.7277

5.5876 5.5879 5.5876 5.5879

5.6259

5.6231 5.5825 5.5822 5.6240

5.5844 5.5847 5.5844 5.5847

5.5709 5.5712 5.5709 5.5712

5.6229 5.5619 5.5688 5.5980 5.5622 5.6238 5.5971 5.5685 5.5657 5.6250 5.6018 5.5709 5.6250 5.5660 5.6009 5.5706 5.6259 5.6231 5.5763 5.6034 5.5766 5.6240 5.6025 5.5797 5.6068 5.5844 5.6250 5.6250 5.5800 5.6259 5.6059 5.5841

5.5167 5.5170 5.5167 5.5170

5.5135 5.5132

5.4573

5.5U27 5.6218 5.5749 5.5030 5.6231 5.5736 5.5086 5.5808 5.5167 5.6250 5.5089 5.5795 5.51645.6263

in.

10

Pitch Diam.

5.4594 5.4597 5.4594 5.4597

in.

9

Pitch Diam.

t

5.4515 5.4786 5.4576 5.4982 5.4518 5.4991 5.4777 5.4549 5.4820 5.45945.5000 5.4552 5.5009 5.4811 5.4591

in.

Full-Form

Major Diameter Full-Form Truncated

Pitch Diam.

NOT GO (LO)

T-

5.5717 5.6800 5.7463 5.5839 5.7182 5.7463 5.5720 5.6785 5.7478 5.7478 5.5836 5.7167 5.5784 5.5876 5.6867 5.7500 5.7500 5.721 9 5.5787 5.7515 5.6852 5.5873 5.7515 5.7204

5.6126 5.6117 5.6145 5.6136

5.6100 5.6229 5.6238 5.6091 5.61 21 5.6259 5.6112

5.6008 5.5995 5.6040 5.6027

5.4877 5.4868 5.4895 5.4886

4

Truncated

Major Diameter

CO

I

W Thread-Setting Plugs

-

5.5700 5.5687 5.5700 5.5687

5.4790 5.4775 5.4790 5.4775

5.5570 5.5561 5.5570 5.5561

5.5350 5.5341 5.5350 5.5341

5.4450 5.4437 5.4450 5.4437

5.4320 5.431 1 5.4320 5.4311

in.

11

L__

Minor Diam.

T

2B 5.4460 5.4451 5.4408 5.4399

in.

13

Minor Class Diam.

5.6558 5.6555 5.6523 5.6520

5.6035 5.6032 5.5995 5.5992

5.5925 5.5922 5.5905 5.5902

5.6000 5.5987 3B 5.5896 5.5883

2B 5.5170 5.5155 5.5094 5.5079

5.5710 5.5701 5.5658 5.5649

5.5799 2B 5.5530 5.5796 5.5521 5.5776 3B 5.5448 5.5773 5.5439

5.5307 5.4750 5.5304 5.4737 5.5272 3B 5.4646 5.5269 5.4633

5.4673 5.4670 5.4653 5.4650

In.

12

Pitch Diam.

W Thread-Setting Rings

TABLE 11 SETTING GAGES FOR STANDARD THREAD SERIES,CLASSES, I A , 2A, 3A, IB, PB, A N D 3B UNIFIED SCREW THREADS LIMITS O F SIZE (CONT'D)

I

28

38

38

28

28

38

14

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

N

I 3A

in.

5.8600 5.8591 5.8621 5.8612

5.8507 5.8494 5.8540 5.8527

5.7376 5.7367 5.7395 5.7386

5.8188 5.8185 5.8209 5.8206

5.7634 5.7631 5.7667 5.7664

5.7075 5.7072 5.7094 5.7091

5.6938 5.6935 5.6959 5.6956

in.

6

Pitch Diam.

5.8339 5.8336 5.8376 5.8373

5.8325 5.8322 5.8344 5.8341

T

t

5.9298 5.9283 5.9366 5.9351

5.8534 5.8525 5.8568 5.8559

5.8480 5.8471 5.8518 5.8509

5.8247 5.8234 5.8307 5.8294

5.7284 5.7275 5.7318 5.7309

5.7230 5.7221 5.7268 5.7259

in.

7

Truncated

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'

5.9963 5.9978 6.0000 6.0015

5.8731 5.8740 5.8750 5.8759

5.8729 5.8738 5.8750 5.8759

5.8717 5.8730 5.8750 5,8763

5,7481 5.7490 5.7500 5.7509

5.7479 5.7488 5.7500 5.7509

5.8215 5.8218 5.8283 5.8286

5.8263 5.8266 5.8297 5.8300

5.8119 5.8122 5.8157 5.8160

5.7525 5.7528 5.7585 5.7588

5.7013 5.7016 5.7047 5.7050

5.6869 5.6872 5.6907 5.6910

in.

9

a in.

Diam.

Full-Form

T Pitch

NOT GO (LO) Major Diameter

W Thread-Settinz Plugs

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

5.9963 5.9978 6.0000 6.0015

5.8731 5.8740 5.8750 518759

5.8729 5.8738 5.8750 5.8759

5.8717 5.8730 5.8750 5.8763

5.7481 5.7490 5.7500 5.7509

5.7479 5.7488 5.7500 5.7509

in.

5.7350 5.7341 5.737-1 5.7362

5

Full-Form

4

5.9682 5.9667 5.9719 5.9704

3A

3A

3A

2A

3

Truncated

6-4or 6.000-4

l

I

1

I

Class

t

5.8626 5.8617 5.8645 5.8636

UN

2

Series Designation

~

GO

Major Diameter

57/8-16or 5.875-16

57/8-12or 5.875-12

57/84or 5.875-6

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

VI

53/4-16or 5.750-16

53/4-12or 5.750-12

1

Nominal Size and Threads/fn.

T I

5.8376 5.8379 5.8376 5.8379

5.8344 5.8347 5.8344 5.8347

5.8209 5.8212 5.8209 5.8212

5.7667 5.7670 5.7667 5.7670

5.7094 5.7097 5.7094 5.7097

5.6959 5.6962 5.6959 5.6962

in.

10

Pitch Diam.

t

T Minor Diam.

5.7290 5.7275 5.7290 5.7275

5.8070 5.8061 5.8070 5.8061

5.7850 5.7841 5.7850 5.7841

5.6950 5.6937 5.6950 5.6937

5.6820 5.6811 5.6820 5.6811

5.6600 5.6591 5.6600 5.6591

in.

11

5.7809 5.7806 5.7773 5.7770

5.7175 5.7172 5.7155 5.7152

5.7049 5.7046 5.7026 5.7023

in.

12 14

Pitch Diam.

5.8537 5.8534 5.8496 5.8493

5.8425 5.8422 5.8405 5.8402

5.8299 5.8296 5.8276 5.8273

T

-

GO

W Thread-Setting Rings

TABLE 11 SETTING GAGES FOR STANDARD THREAD SERIES,CLASSES, lA, 2A,3A, IB, 2B, AND 3B UNIFIED SCREW THREADS - LIMITS OF SIZE (CONT'D)

5.7670 5.7655 3B 5.7594 5.7579

5.8210 5.8201 5.8158 5.8149

2B 5.8030 5.8021 5.7948 5.7939

5.7250 5.7237 5.7146 5.7133

5.6960 2B 5.6951 5.6908 5.6899

5.6780 5.6771 5.6698 5.6689

in.

13

Minor Diam.

I

28

3B

28

38

38

2B

3B

38

28

Class

UN

UN

UN

6-6or 6.000-6

6-12 or 6.000-12

6-16 or 6.000-16 3A

2A

3A

2A

3A

2A

3

2

1

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

m

e h)

Class

Series Designation

Nominal Size and Threads/in.

I

II I

-

5.9876 5.9867 5.9895 5.9886

5.9850 5.9841 5.9871

1-

NOT GO (LO)

5.9575 5.9572 5.9594 5.9591

5.9784 5.9775 5,9818 5.9809

5.9730 5.9721 5.9768 5.9759

5.9981 5.9990 6.0000 6.0009

5.9979 5.9988 6.0000

6.0000

1

6.0013 5.8920

10

Pitch

5.9513 5.9516 5.9547 5.9550

5.9594 5.9597 5.9594 5.9597

5.9369 5.9459 5.9372 5.9462 5.9407 5.9459 5.9410 6.0009

5.8838

in.

in.

in.

5.9497 5.9484 5.9557 5.9544

9

8

Pitch Diam.

7

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

-

5.9981 5.9990 6.0000 6.0009

5.9438 5.9435 5.9459 5.9456 5.9862

In. 5.8884 5.9757 5.8881 5.9744 5.8917 5.8914

in. 5.9967 5.9980 6.0000 6.0013

in.

5.9979 5.9988 6.0000 6.0009

6

5

5.9790 5.9777

t

T Major Diameter Pitch Diam. Truncated Full-Form Truncated

4

Full-Form

Major Diameter

GO

W Thread-Setting Plugs

-

1

t

12

5.9100 5.9091 5.9100 5.9091

5.9675 5.9672 5.9655 5.9652

5.9549 5.9546 5.9526 5.9523 5.9462

in. In. In. 5.8200 5.8917 5.9059 5.8187 5.9056 5.8920 5.8200 5.8917 5.9024 5,8187 5.9021

11

5.9460 5.9451 5.9408 5.9399

5.9280 5.9271 5.9198 5.9189

5.8775 5.8500 5.8778 5.8487 5.8835 5.8396 5.8383

in.

13

Minor Diam.

NOT GO (HI)

Minor Pitch Diam. Diam. Diam.

5.9320 5.9311 5.9320 5.9311

CO

W Thread-Setting Rings

TABLE 11 SETTING GAGES FOR STANDARD THREAD SERIES,CLASSES, I A , 2A, 3A, IB, 2B, A N D 3B UNIFIED SCREW THREADS LIMITS OF SIZE (CONT'D)

I

38

28

3B

28

5.9967 2B 5.9980 3B

14

Class

% 0

0

z

Cn "I D

i

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

ANSVASME B1.2-1983 ANAMERICANNATIONALSTANDARD

GAGESANDGAGING FOR UNIFIED INCH SCREW THREADS

FIG. 18 MAXIMUM-MATERIAL GOFUNCTIONALLIMIT

5.1.9 Leadand Half-Angle Variations. Lead and half-angle variations shall be within the limits specified in Table 6 . Misalignment of the threads on each side of the adjustable slot may not exceed the lead limits.

5.1.6Thread Roots. The major diameter of the GO thread ring gage shallbe cleared beyond P / 8 width of flat by either an extension of the flanks toward a sharpvee or by a clearance cut of substantially P/ 8 width and approximately central. The rootclearance must be such that the maximum major diameter of the full-form section of the truncated thread-setting plug gage is cleared after the gage has been properly set to size.

5.1.IO Incomplete Thread. Thefeather edge at bothends of the thread ring gage shall be removed. O n gages larger than 1/2 in. or with a pitch coarser than 20 threadslin., remove not morethan one pitch of the partially formed thread at each end to obtain a full-thread blunt start. On gages 1/ 2 in. and smaller or with a pitch of 20 threadslin. or finer, the end threads may have a 60 deg. chamfer from the axis of the gage €0 a depth of half to one pitch. This is acceptable in lieu of the blunt start.

5.1.7 Runout of Pitch and Minor Cylinders. On thread ring gages, an eccentric condition results in an undersize effective minor diameter, having a width of flat less than P/4,which may encroach on the maximum permissible limit for the root profile of the product external thread. The permissible minimum effective minor diameter asdetermined by measurements of runout (full-indicator movement) with respect to the pitch cylinder shall not be less than the specified minimum minor diameter minus the sum of the gage tolerances for thepitch and minordiameters,

5.1.I1 Chip Grooves. GO thread ring gages of the adjustable type do not require chip grooves as theadjusting slots serve this purpose. Solid working thread ring gages are made with or without chip grooves, depending uponthe gagedesigner's requirements.

5.1.8 Pitch Cylinder. Pitch cylinder is transferred by the setting of the thread ring gage to the applicable truncated setting plug gage. 127

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

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ANSIIASME B1.2-1983 AN AMERICAN NATIONAL STANDARD --`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

5.1.I 2 Identification. The GO thread ring gage should be identified by the nominal size, threadslin., thread series, class, GO, PD, and pitch diameter. EXAMPLE: 1/4-20 (or .250-20) UNC-2A GO PD.2164

5.2 NOT GO (LO) Thread Ring Gages (Table 1 - Gage 1.2) TheNOT GO (LO) 5.2.1 PurposeandUse. thread ring gage inspects the NOT GO (LO) functional diameter limit, B I , of product external thread. The NOT GO (LO) thread ring gage, when properly set to its respective calibrated thread-setting plug, represents the NOTGO (LO) functional diameter limit of the product external thread. The NOTGO (LO) thread ring gage and NOT GO (LO) threaded segment type indicating gage are more reliable for checking thinwalled parts which might be deformed bv a NOT GO (LO) thread snap. NOT GO (LO) thread ring gages mustbe set to the applicable W tolerance-setting plugs. NOT GO (LO) thread ring gages when applied to the product external thread may engage only the end threads (which may not be representative of the complete product thread). StartingthreadsonNOT GO (LO) thread ring gages are subject to greater wear than the remaining threads. Such wear in combination with the incomplete threads at the end of the product thread permit further entry in the gage. NOT GO (LO) functional diameter is acceptable when the NOT GO (LO) thread ring gage applied to the product external threaddoes not pass over the thread more than three complete turns.The gage should not be forced. Special requirements such as exceptionally thin or ductile material, small number of threads, etc., may necessitate modification of this practice.

5.2.2Basic Design. Tobetter check the NOT GO (LO) functional diameter limit, the flank contact is less than that of the GO gage, and the length of the gaging element where practical is less than that of the GO gage. 5.2.3Gage Blanks. For practical and economic reasons, the designs and thicknesses of thread ring gages have been standardized for various size ranges and pitches (see ANSI B47.1 or Table A4). 5.2.4Thread Form. The specifications for thread form are summarized in Table 4 and Fig. 19.

Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

GAGES AND GAGING FOR UNIFIED INCH SCREWTHREADS

5.2.5ThreadCrests. The minimum minor diameter of the NOT GO (LO) thread ring gage shall be equal to the minimum pitch diameter of the externalthread minus 0.25H withgage tolerance plus. This corresponds to a width of flat at the crest of the gage equal to 0.375~.See Table 4. 5.2.6Thread Roots. The major diameter of the NOT GO (LO) thread ring gage shall clear the product thread by using a clearance cut of 0 . 2 5 ~width approximately central. TheNOT GO (LO) thread ring gage shall clear the maximum majordiameter of the full-form portion of the truncated thread-setting plug for the NOT GO (LO) thread ring gage. Thus, contact of the thread gage can occur on the sides of the threads, but not on the crest or root. Also, the effect of angle variation on the fit of the gage with the product thread is minimized. 5.2.7 Runout of Pitch and Minor Diameter Cylinders. The permissible minimum effectiveminor diameter, as determined by subtracting runout measurement (full-indicator movement) with respect to the pitch cylinder from the measured minor diameter, shallnot beless than the specified minimum minor diameter minus twice the sum of the gage tolerances for pitch and minor diameters. 5.2.8 Pitch Cylinder. Pitch cylinder is transferred by the setting of the thread ring gage to the applicable truncated setting plug gage. 5.2.9 Leadand Half-Angle Variations. Lead and half-angle variations shall be within the limits specified in Table 6. 5.2.10 Incomplete Thread. The feather edge at both ends of the thread ring gage shall be removed. On gages larger than 1/ 2 in. nominal size or having pitches coarser than 20 threadslin., not more than one complete turn of the end threads shall be removed to obtain a full-thread blunt start. On gages 1/2 in. nominal size and smaller or having pitches of 20 threads/in. or finer, a 60 deg. chamfer from the axis of the gage is acceptable in lieu of the blunt start. 5.2.11 Identification. The NOT GO (LO) thread gage should be identified by the nominalsize. threads/ in.,thread series, class, NOT GO, PD, and pitch diameter. EXAMPLE: 1/420 (or .250-20) UNC-2A NOT GO PD.2127

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GAGESANDGAGING FOR UNIFIED INCH SCREW THREADS

ANSVASME B1.2-1983 ANAMERICANNATIONALSTANDARD

5 . 3 Thread Snap Gages - GO Segments or Rolls (Table 1 - Gage 2.1 and 2.3)

-i

t

3

5.3.1 Purposeand Use. Thethreadsnapgage with two GO threaded segments or twoGO zero lead rolls inspects the maximum-material GO functional limit, A I , of product external thread. The setting of the GO segments or rolls represents the maximum material GO functional limit of the product external thread, and its purpose is to assure interchangeable assembly of maximum-materialmatingparts. The gaging length of the segments or rolls is equal to the length of the standard GO ring gages. The segments or rolls have a cumulative check of all thread elements except the major diameter. The GO thread snap gage can also check roundness of the pitch cylinder for 180 deg. ovality by using the gage at different external diametral locations on the product thread. 5 . 3 . 2 Basic Design. The GO segments and rolls assembled into gage frames are the design of the individual gage manufacturer.Thelengths of thetwo threadedsegments and the two thread rollsspaced 180 deg. apart are equal to the standard GO ring gage blanklengthsforpracticalandeconomicreasons. See ANSI B47.1 or Table A4.

GO thread segments shall engage 25%-ormore of the producfcircumference. Product shall be checked around full circumference of thread atsufficient axial positions to check the full-thread length. Thread rolls shall be applied at several locations (three if possible) axially overthe full-thread length of the product. The circumference shall be checked at each position. 5-.3.3 Thread Form. The specifications for thread form are summarized in Table 4 and Fig. 20. 5.3.4 Thread Crests. The distance between the minor diameter of the GO thread segments and the outside diameter of GO thread rolls shall be equal to the maximum pitch diameter of the product external thread minus H t 2 with a minus gage tolerance when assembled in gage frame. This corresponds to a width of flat of P/4on crests. The threadcrests shall be flat in an axial plane and parallel to the axis. 5.3.5 Thread Roots. The major diameter of the GO thread segments and root diameter of the GO rolls shall be cleared beyond a P/8 flat either by an extension of the flanks of the thread toward a sharp vee or by an undercut no greater thanP/8maximum width and approximately central. The root clearance

1 29 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

FIG. 19 NOT GO (LO) FUNCTIONALDIAMETERLIMIT

ASME 9 3 . 2 8 3 W 2 5 7 5 5 3 2 O O L L 7 7 L 3

FOR GAGESANDGAGING UNIFIEDINCH SCREW THREADS

ANSIIASME B1.2-1983 ANAMERICANNATIONALSTANDARD

0 (3

n

a 2 V)

n

a W

K I I-

O N

130 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

.-.-

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

Licensee=EMBRAER/1829800100, User=Donato, Thiago Not for Resale, 12/11/2009 04:52:26 MST

GAGESANDGAGING FOR UNIFIED INCH SCREW THREADS

-

ANSVASME B1.2-1983 ANAMERICANNATIONALSTANDARD

must be such that the maximum major diameter of the full-form section of the truncated thread-setting plug gage is cleared after the gage has been properly set to size.

GO (LO) functional diameter limit, the flank contact is reduced by truncating the thread on segments and rolls. As the design of the segmentsor rolls is different with each gage manufacturer, the number of threads engaged in productthread will vary. Usually, the number of pitches engaged is approximately two.

5 . 3 , 6 Runout. The pitch and minor cylinders of thethreadedportion of the GO segments or rolls shall not exceed the specified runout as determined by measurements of runout (full-indicator movement). On each gaging member, with respect to the pitch cylinder, runout shall not exceed one-half the. X gage minor diameter tolerance.

5.4.3 Thread Form. The specifications for thread form are summarized in Table 4 and Fig. 2 1. 5.4.4 Thread Crests. The minor diameter ofthe NOT GO (LO) thread segments andthe inner distance between theoutside diameters of NOT GO (LO) thread rolls shall be equal to the minimum pitch diameter of the product external thread minus 0.25H with the gage toIerance plus when assembled in gage frame. This correspondsto a width of flat at the crest equal to 0.375~.See Table 4.

5.3.7 Pitch Cylinder. The pitch cylinder of the threaded GO segments and rollsshall be straight within the X gage pitch diameter limits specified. 5 . 3 . 8 Lead, Pitch, and Half-Angle Variations. Lead, pitch, and half-angle variations shall be within the limits specified. See Table 6.

5.4.5 Thread Roots. The major diameter of the NOT GO (LO) thread segments or root diameter of the NOTGO (LO) rolls shall clear the product thread by using a clearance cutof 0 . 2 5 ~width approximately central. Snap gage contacts shall clear the maximum major diameter ofthe full-form portion of the setting plug for the NOT GO (LO) thread snap gage. Thus, contact of the thread gage can occur on the sides of the thread but not on the crest or root. Also, the effect of angle variation on the fit of the gage with the product thread is minimized.

5.3.9 Identification. The assembled gageshould be marked by the nominal size, threadslin., thread series, class, GO, PD, and pitch diameter, EXAMPLE: 1/4-20 (or .250-20) UNC-2A GO PD.2164

5 . 4 Thread Snap Gages - NOT GO (LO) Segments or Rolls (Table 1 - Gage 2 . 2 and 2.4)

5.4.6 Runout. The pitch and minor cylinders of the threaded NOTGO (LO) segments or thepitch and outsidecylinders of the rolls shall not exceed the specified runout as determined by measurement of runout (full-indicatormovement). On eachgaging member, with respect to thepitchcylinder, runout shall not exceed one-half the X gage minor diameter tolerance.

5 . 4 . 1 PurposeandUse. The thread snap gage with two NOT GO (LO) segments or two NOT GO (LO) rolls inspects theNOT GO (LO)functional diameter limit, B I , of product external thread. The setting of the NOT GO (LO) segments or rolls represents the NOT GO (LO) functional diameter limit of the product external thread. In applying the thread snap limit gage, the NOT GO (LO) functional diameter is acceptable when gaging elements do not pass over the product thread. The NOTGO (LO) thread snapgage can alsocheck roundness of the pitch cylinder for 180 deg. ovality by passing the gage over the thread at different diametral locations on fhe external thread. TheNOT GO (LO) threadsnap gage canalso check taper of pitch cylinder by passing the gage over the thread at different locations axially on external thread.

5.4.7 Pitch Cylinder. The pitch cylinder of the threaded NOT GO (LO) segments or rolls shall be straight within the X gage pitch diameter limits specified. 5.4.8 Lead, Pitch, and Half-Angle Variations. Lead, pitch, and half-angle variations shall be within the limits specified. See Table 6. 5.4.9 Identification. The assembled gage should be marked by the nominal size, threads!in., thread series, class, NOT GO, PD, and pitch diameter.

5.4.2 Basic Design. In order that the NOT GO (LO) thread snapgage may effectively check the NOT

EXAMPLE: 1/4-20 (or .250-20) UNC-2A NOT GO PD.2127

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'ASME 81.2 8 3

ANSIIASME B1.2-1983 ANAMERICANNATIONALSTANDARD

m

2 5 7 5 5 1 2 0011773 7

GAGESANDGAGING FOR UNIFIED INCHSCREW THREADS

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

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ASME B I - 2 8 3 M 2 5 9 5 5 3 20 0 3 3 7 9 4 - 9

ANSVASME 61.2-1 983 ANAMERICANNATIONAL STANDARD

GAGESANDGAGING FOR UNIFIED INCH SCREW THREADS

5 . 5 Thread Snap Gages - Cone and Vee (Table 1 - Gage 2.5)

5 . 6 . 2 Basic Design. The threadgroovediameter type has “best size” thread wire size radius ribbed rolls which contact at the pitch line.

5.5.1 PurposeandUse. The thread snap gage with cone and vee rolls or segments inspects minimum-material diameter limit, CI. The setting of the cone and vee rolls or segments represents the minimum-materiallimitpitchdiameter of theproduct external thread. The cone and vee snap gage can check roundness of pitch diameter for 180 deg. ovality by passing the gage over the thread at different diametral locations on the external thread. The cone and vee snap gage can check taper of pitch cylinder by passing the gage over the thread at different locations axially on external thread.

5 . 6 . 3 Thread Form. The specifications forradius type rolls are shown in Fig. 23. 5 . 6 . 4 Identification. The assembled gage should be marked by the nominal size, threadslin., thread series, class, PD, and pitch diameter. EXAMPLE: 1/4-20 (or .250-20) UNC-2A PD.2127

5.5.2 Basic Design. The segments are usually made having a surface contact at or slightly above the pitch line near the center of the flank. The rolls makepoint or line contactsapproximatelyatthe pitch line, depending upon the anglevariations of the thread flanks. See Fig. 22 for details. ..“

5 . 7 Plain Ring and Snap Gages to Check Major Diameter of Product External Threads (Table 1 - Gages 3.1, 3.2, and 3.4) 5.7.1 Purpose and Use. The GO and NOT GO cylindrical ring and plain snap gages inspect the major diameter of the product external thread. TheGO gage must completely receive or pass over the major diameter of theproductexternal threadtoassure that the major diameter does not exceed the maximum-material limit. The NOT GO cylindrical ring gage or NOT GO plain snap gage must not pass over the major diameter of the product external thread to assure that the major diameter is not less than the minimum-material limit.

5.5.3 Thread Form. The specifications for thread form, thread crests, and thread roots are shown in Fig. 22. 5 . 5 . 4 Identification, The assembled gage should be marked by the nominal size, threadslin., thread series, class, PD, and pitch diameter. EXAMPLE: 1 !4-20 (or .250-20) UNC-2A PD.2127

5.7.2 DesignofGageBlanksandGages. Plaincylindricalringblanks and plain progressive adjustablesnap gages have been standardized for various size ranges (see ANSI B47.1 and Fig. 24).

5 . 6 Thread Snap Gages - Minimum Material: Thread Groove Diameter Type (Table 1 - Gage 2.6)

-.

W

5.6.1 Purposeand Use. The thread snap gage with radius type ribbedrolls inspects minimum-material diameterlimit, D,.Thesetting of thethread groove diameter type snap gage by NOT GO (LO) setting plug gagerepresents the minimum-material limit pitch diameter of the product external thread. The threadgroovediametertype snap gage can check roundness for 180 deg. ovality by passing the gage over the thread at different diametral locations on the external thread. Thethread groovediametertype snap gage can check taper of pitch cylinder by passing the gage over the thread at different locations axially on external thread.

5.7.3 Identification. Cylindrical rings or plain snap gages shouldbemarked with nominal size, threadslim, threadseries, class, GO and/ or NOT GO, and major diameter limits. EXAMPLE: 1/4-20 UNC-2A G0.2489 and!or NOT G0.2408

5.7.4 Precision Instruments (Table 1 - Gage 14). Precision instruments such as dial calipers, outsidemicrometers, vernier calipers, and pocket slide calipers can also be used to measure the major diameter of product external thread. I33

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0-,

Segment

' (a)

Gaging Element

GENERAL NOTE: Contacts in other positions near cylinder pitch the are also used.

(b)

Gaging Elerneqt

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FIG. 22 THREAD SNAP GAGES - MINIMUM-MATERIAL PITCH DIAMETER LIMIT- CONE AND

Zero Lead Rolls

Contacts above line pitch

''a

/

Total segment contact to be minimum 25% of circumference

VEE

central on pitch line

-

ASNE BL.2

83 H 2 5 9 5 5 1 2 00LL77b 2 ANSVASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

GAGES AND GAGING FOR UNIFIED INCH SCREWTHREADS

Q

lis-gaging contacts with ius one-half "best size'' ead wire diameter

ed

"

tTG4r-;F I ,f

\

I

Single rib roll

Gaging Contact

FIG. 23 THREAD SNAP GAGES - MINIMUM-MATERIAL THREAD GROOVE DIAMETER LIMIT

5.8 Snap Gages for Minor Diameter of Product External Threads (Table 1 - Gages 3.3 and 3.5)

EXAMPLE: 1/4-20 (or .250-20) UNC-2A GO - NOT GO (Customer's Specifications) MINOR DIAMETER EXTERNAL

5.8.1 Purpose and Use. TheGOthreadring gages inspect the depth of thread equivalent to the minor diameter of theproductinternalthread. If the minor diameter of the external thread requires checking, a minimum-maximum thread snap gage may be used. GO segment or rollsnap gage. must pass over productthread. NOT GO segment or roll must not pass over product thread. the NOT 5 . 8 . 2 Basic Design. A threadsnap gage has segments or rolls with a thread form of 55 deg. maximum. There usually are three threads on the segments or three ribs on therolls on GO and NOT GO gaging elements. See Fig. 25.

5.9 Functional indicating Thread Gages for External Thread (Table 1 Gages 4 . 1 and 4.3)

.

5 . 9 . 2 Basic Design. Indicating gages have two or three contacts at 180 deg. or 120 deg., respectively. Gages with segments or rolls are designed with the length of the GO functional maximum-material gag-

5.8.3 Identification. Thread snap gages should be marked with nominal size, threadslin., thread Series, class, GO and NOT.GO minor diameter limits, and MINOR DIAMETER EXTERNAL.

-

5.9.1 Purpose and Use. The GO indicating thread gage (4.1 and 4.3) inspects the maximum-materialGOfunctional limit and size, Al and AP,and GO (LO) functional diameter limit and size, BI and B2, of product external thread. The gage is also used to check even or odd lobe roundness of pitch cylinder. Indicating thread gages must be set to the proper thread-setting plug gages. Readings indicate the position of product external thread within the tolerance range.

135

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.J

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"l

ASME B I - 2 83

rn

2575532 0013797 4

ANSI/ASME B1.2-1983 ANAMERICANNATIONALSTANDARD

rn

GAGESANDGAGING FOR UNIFIEDINCH SCREW THREADS

(a) Cylindrical Ring Gages --`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

(Made to Class Z tolerance, Table 8 )

NOT GO

GO

(b) Adjustable Limit Snap Gage (see ANSI/ASME 847.1 for details)

FIG. 24 MAJOR DIAMETER LIMIT

extension of the flanks of the thread toward a sharp vee or by an undercut no greater than P/8 maximum width and approximately central. The root clearance must be such that the major diameter of the full-form section of the thread-setting plug gage is clearedafter the assembled gage has been properly set to size.

ing elements equal to the length of the standard GO ring gages. 5.9.3 Thread Form. The specificationsforthread form for GO functional maximum-material segments and rolls are summarized in Table 4 and Fig. 26.

5.9.6 Runout. The pitch and minor cylinders of the threaded segments and thepitch and outside cylinders of the rolls shall not exceed the specified runout as determined by measurements of runout (full-indicator movement). On each gaging member with respect to the pitch cylinder, runqut~-shallnot exceed one-half the X gage minor diameter tolerance.

5 . 9 . 4 Thread Crests. The minor diameter ofthe GO functional maximum-material thread segments and the diameter of the circle surrounded by the roll cluster of GO functional maximum-material rolls shall be equal to the maximum pitch diameter of the product external thread minus H / 2 with a minus X gage tolerance when assembled in gage frame. This corresponds to a width of flat of P / 4 on crests. The thread crests shall be flat in an axial plane and parallel to the axis of segment or roll.

5 . 9 . 7 Pitch Cylinder. The pitch cylinder of the thread segments and rolkshould be straight within the X gage pitch diameter limits specified.

5.9.5 Thread Roots. The major diameter of the GO functional maximum-material thread segments and the rootof the GO functional maximum-material rolls shall be cleared beyond a P / 8 flat either by an

5.9.8 Lead, Pitch, and Half-Angle Variations. Lead, pitch, and half-angle variations shall be within the limits specified. See Table 6, I36

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GAGESANDGAGING FOR UNIFIED INCH SCREW THREADS

ANSVASME 61.2-1983 AN AMERICANNATIONAL STANDARD

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FOR GAGESANDGAGING UNIFIED INCH SCREW THREADS

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ANSI/ASME B1.2-1983 ANAMERICANNATIONALSTANDARD

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--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

GAGESANDGAGING FOR UNIFIED INCH SCREW THREADS

ANSVASME B1.2-1983 ANAMERICANNATIONALSTANDARD

5.1 1.2Basic Design. Indicating gages have three contacts, one plain and one threaded, at 120 deg., or twocontacts,oneplainandonethreaded, at 180 deg. The threaded segments or roll contacts are minimum-material pitch diameter type. See Fig. 27. The length of the plain and threaded contactsare designed equal to the length of the standard GO ring gages. See ANSI B47.1 and Table A4. The indicating gage is set to a basic full-formthread-settingplug gage withplaingagingcontact onoutsidediameter of thread-setting plug gage and thread contact on pitch diameter of thread-setting plug gage.

5.9.9 Identification. The segments and rolls shall be identified by the nominal size and threadslin. When indicating gage is assembled with proper contacts, thegage should be tagged with the nominalsize, threadslin., thread series, class, PD, and pitch diameter limits. EXAMPLE: 1!4-20 (or .250-20) UNC-2A PD.2164.2127

5.10 Minimum-Material Indicating Thread Gages for External Thread (Table 1 Gages 4.5 and 4.6)

5.1 1.3Thread Form, Thread Crests, andLead and Half-Angle Variations. The specifications for thread form, thread crests, and lead and half-angle of threadsegmentsand thread rolls are noted in 5.9. Plain contacfs have a line bearing on major diameter of product. See Fig. 29.

5.10.1 Purpose and Use. The indicating thread gage withconeand vee rolls or segments andthe thread groove diameter type with rolls inspects the minimum-material limit and size (Cl and C2,0,and 0 2 ) of product external thread. Either type of threeroll and three-segment gage can check roundness of pitch cylinder for 120 deg. lobing and taper of pitch cylinder. The two rolls and two segments check even lobing roundness and taper. The indicating gages are set to the proper thread-setting plug gage. Readings indicate the position of product external thread pitch diameter within the tolerance range.

5 . 1 1.4 Identification. The gagingelements, segments, or rolls should be marked with nominal size and threadslin. When indicating gage is assembled with proper gagingcontacts,the indicating gage shouldbe tagged withnominal size, threads/in., thread series, class, and RUNOUT. EXAMPLE: li4-20 (or .250-20) UNC-2A RUNOUT

5.1 0.2 Basic Design. The cone and vee indicating thread gage has rolls or segmentswithcontact near the pitch line or contact slightly above thepitch line near the center of the flank. The thread groove diameter type indicating thread gage also has two or three rolls with the radii on the ribs of rolls made to “best size” thread wire size.

5.1 2 Differential Gaging (Table 1 - Gage 4.8) 5.1 2.1 The concept of differentialgaging for product external threads makes use of fundamental geometric theorems that relate directly to size, position, and form. For differential gaging, two methods are used for measuring screw thread size: (a) GO functional size (b) pitch diameter (or thread groove diameter) Only when a screw thread has perfect position and form [i.e., zerovariationin lead (including helical path), flank angle, taper, and roundness] are these two measurements equal. Differential gaging is a variables method of in-process inspection, final conformance inspection, or both, that provides the actual numerical values for both GO functional and pitch diameter sizes. These are the two extreme sizes of any product screw thread. One of the sizes, pitch diamter, is the size of the thread pitch diameter with essentially zero variation in all other thread elements, while the other size, GO functional size, is the size of the thread with the effects of all variationsin all other

5.1 0.3Thread Form. Thespecifications on form of cone and vee rolls and segments andthread groove diameter type rolls are shown in Figs. 27 and 28. 5.1 0.4 Identification. The assembled gageshould be tagged with the nominal size, threadslin., thread series, class, PD, and pitch diameter. EXAMPLE: li4-20 (or .250-20) UNC-2A PD.2127

5 . 1 1 Indicating Runout Gage for External Threads (Table 1 - Gage 4.7) 5.1 1.1 Purpose and Use. This indicating gage inspects the runout of the major diameter, M,, to the pitch diameter of the product external thread: Readings indicate the position of product major diameter to the pitch diameter within the tolerance specified.

I39

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GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

ANSI/ASME 61.2-1983 AN AMERICAN NATIONAL STANDARD

W

W

> W

z

0 0

I

n

z a

I

n

a

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r

ASME BL.2

83

2575532 0033802 4 W

GAGES AND GAGING FOR UNIFIED INCH SCREWTHREADS

ANSIIASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

Rolls Two or Three Contacts

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FIG. 28 INDICATING THREAD GAGES-MINIMUM-MATERIAL THREAD GROOVE DIAMETER LIMIT AND SIZE

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ASME B 1 . 2

83

2 5 9 5 5 1 2 0011803 b W

GAGES ANDGAGING FOR UNIFIED INCH SCREWTHREADS

ANSI/ASME B I .2-1983 ANAMERICANNATIONALSTANDARD

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

Segments Two or Three Contacts

Rolls

Two or Three Contacts

FIG. 29 INDICATING THREAD GAGES - DIAMETER RUNOUT

- MAJOR

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TO PITCH

ANSVASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

GAGES AND GAGING FOR UNIFIED INCH SCREWTHREADS

thread elements added to the pitch diameter. The numerical difference between these two sizes is called a cumulative thread element variation differential and represents the diametral effect of the total amount of thread element variation different-ial. The inspection process that further refines the total amount of thread element variation so that the amount of variationfor each individual element becomes known is called a single thread element variation differential. 5.12.2 Cumulative Thread Element Variation Differential. Indicating gages have either three contacts at 120 deg. spacing or two contacts at 180 deg. spacing. The indicating gages with segments or rolls as shown in Figs. 26 and 30, sketch (a), give the functional size indicating reading, Z. The indicating gage with cone and vee segments or rolls with one thread pitch engagement at pitch diameter line, Fig. 27; and thread groove diameter type, Fig. 28; or both, shown in Fig. 30, sketches (C)and (d), give the pitch diameter size indicating reading, X. The difference in the indicator readings, Z-X, between the two types of gages gives the cumulative form differential reading which corresponds to thepitch diameter equivalent, AdzC,for for the combinatin of lead, helix, flank angle, roundness, and taper variations on the product thread. See Fig. 30.

5 . 1 2 . 4 Thread Form. Thefunctional segments or rolls, Fig. 30, sketch (a), are described in 5.9. The full-form, one threadvee segment or roll, Figs. 26 and 30, sketch (b) lower contact, has a depth of thread equivalent to the functional type, but relieved on the outside thread flanks. The full-form cone segment or roll, Figs. 26 and 30, sketch (b) upper contact, has a PI8 flat on outside diameter. The cone and vee segments or rolls, Fig. 30, sketch (C), are described and shown in Fig. 27. Thread groove diameter type, Fig. 30, sketch (d), is described and shown in Fig. 28. 5 . 1 2 . 5 Identification. The gaging elements (segments or rolls) should be identified by nominal size and pitch. Indicating gages, assembled with proper contacts, shouldbe tagged with nominal size, threads/ in., thread series, class, and the type of differential reading specified above.

5.12 . 3 Single Thread Element Variation Differential 5.12.3.1 Lead (Helix) Differential Reading. The indicating gage reading, Y, using the full-form thread segments or rolls with one thread pitch engagement, similar to Figs. 26 and 30, sketch (b), is compared to the reading, Z , using the functional size gage shown in Figs. 26 and 30, sketch (a). The difference between the measured values, Z - Y, is the lead differential reading which corresponds to the pitch diameter equivalent, A d A , forthe lead and helix variation on the product thread.

EXAMPLE: 1/4-20 (or .250-20) UNC-2A Flank angle differential variation

5 . 1 3 W Tolerance Thread-Setting Plug Gages 5.13.1 Purpose and Use. Thread-setting plug gages are used to set adjustable thread ring gages, check solid thread ring gages, set thread snap limit gages, and set indicating thread gages. Thread-setting plug gages are also applied to detect wear on gages and gaging elements in use. GO thread-setting plug gages are made to the maximum-material limit of the external thread specification, while NOT GO (LO) thread-setting plug gages are made to the minimummaterial limit of the thread specification.

5.12.3.2 Flank Angle Differential Reading. The indicating gage reading, X, using segments or rolls with cone and vee design, Figs. 27 and 30, sketch (C), is compared to the reading, Y , using the full-form thread segments or rolls, similar to Figs. 26 and 30, sketch (b). Both designs have one threadpitch engagement. The difference between the measured values, Y - X, is the flank angle differential reading which correspondsapproximately to the pitch diameter equivalent, Adza, for the combined flank angle variation on product thread.

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5 . 1 2 . 3 . 3Roundness and Taper Differential Readings. By the use of full-form thread segments or rolls with one thread pitch engagement, similar to Figs. 26 and 30, sketch (b); cone and vee segments or rolls, Figs. 27 and 30, sketch (C);or thread groove diameter type, Figs. 28 and 30, sketch (d), the roundness and taper of pitch cylinder is checked. Rotate the product between contacts at different axial locations on thread for maximumdifference in roundness andtaper readings. Twocontacts spaced 180 deg. apart giveeven lobing out-of-round measurement. Three contacts spaced 120 deg. apart give odd lobing out-of-round measurements.

5.13.2 Basic Design. Thread-setting plug gages are of two standard designs which are designated as full-form and truncated setting plugs. The full-form 143

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ASME B 1 -82235 7 5 5 1020 1 1 8 0 5

T W

GAGESANDGAGING FOR UNIFIEDINCHSCREW THREADS

ANSI/ASME 61.2-1983 ANAMERICANNATIONALSTANDARD

Functional diameter

T

Indicator reading GO functional size Z also used for lead analysis

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

Rolls Two or Three contacts

Adzc = Z-X = cumulative form differential analysis

Ad2A= 2-Y = individual element analysis for lead variation

Adzcu= Y-X = individual element analysis for angle variation P. D. Cone Contact

P. D. Rad. Contact

(C)

(dl

FIG. 30 INDICATING THREAD GAGES- DIFFERENTIAL GAGING 144 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

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-

ASME 61.2 83

2 5 9 5 5 1 2 00118Ob 1

ANSVASME 81.2-1 983 ANAMERICANNATIONALSTANDARD

GAGESANDGAGING FOR UNIFIED INCHSCREW THREADS

5.1 3.7 Pitch Diameter Limitation of Taper. The permissible taper shall be back taper (largest diameter at entering end) and shall be confined within the gage pitch diameter limits.

GO setting plug is one having a width of flat at the crest equal to P/8.The truncated GO setting plug is the same as the full-form setting plug except that it is longer andthe crest of the thread is truncated a greater amount for one-half the length of the gage giving a full-form portion and a truncated portion. See Figs. 31 and 32 and Tables 5, 7, and 11.

5.1 3.8Incomplete Thread. The feather edge at both ends of the threaded section of the setting plug shall be removed. On pitches coarser than 28 threads/ in.,not more than one complete turn of the end threads shallbe removed to obtain afull-thread blunt start. See Fig. 2. On pitches 28 threadslin. and finer, a 60 deg. chamfer from the axis of the gage is acceptable in lieu of the blunt start.

5.1 3.3 Gage Blanks. For practical and economic reasons, the lengths of setting plug gages have been standardized for various size ranges and pitches (see ANSI B47.1 or Table A4). The length of the full form and thelength of the truncatedsections are each at least equal in length to the thickness of the corresponding thread ring gage.

5.1 3.9 Lead Variations. In thecase of truncated setting plugs, the lead variations present on the fullform portion and the truncated portion of an individual gage shall not differ from each other by more than 0.0001 in. over any portion equivalent to the length of the thread ring gage, or nine pitches, whichever is less,The specified tolerance shall be applicable to the thread length in the mating ring gage or nine pitches, whichever is smaller. The tolerance on lead establishes the width of a zone, measured parallel to the axis of the thread, within which the actualhelical path must lie for the specified length of the thread. Measurements will be taken from a fixed reference point, located at the start of the first full thread, to a sufficient number of positions along theentire helix to detect all types of lead variations. The amounts that these positions vary from their basic (theoretical) positions willbe recorded with due respect to sign. The greatest variation in each direction [plus or minus (+)I will be selected, and the sum of their values, disregarding sign, shall not exceed the tolerance limits specified in Table 7.

5.13.4 Thread Form. The specifications for thread form of setting plug gages are stated in detail below and are summarized in Table 5 and Figs. 31 and 32.

5.1 3.5Thread Crests 5.1 3.5.1 The major diameter of the GO fullform setting plug and of the full-form portion of the truncated GO thread-setting plug is equal to themaximum.major diameter of the product externalthread. 5.1 3.5.2The major diameter of the truncated portion of the truncated GO thread-setting plug is equal to the maximum major diameter of the product external thread minus O.O6Ow+ 0.017~.See Table 5 . 5.1 3.5.3The major diameter of the NOT GO (LO) full-form setting plug and of the full-form portions of the truncated NOT GO (LO) thread-setting plug is equal to the maximum major diameter of the product external thread (same as GO thread-setting plug). The maximum major diameter of any gage must correspond toatruncationthat is not less than 0.0009 in. (equivalent to a crest width of 0.001 in. flat).

5.1 3.10 Half-Angle Variations. Variations in half-angle shall be within the limits specified in Table 7. 5.1 3.11 Identification. The GO thread-setting plug for Class 3A is basic, and is applicable to Class 2A after coating. Accordingly, it isrecommended that the gagebe identified by set plug nominal size, threadslin., threadseries, GO, PD, and pitch diameter.

5.13.5.4 The major diameter of the truncated portion of the truncated NOT GO (LO) thread-setting pIug is equal to the minimum pitch diameter of the product external thread plus H/2.

EXAMPLE: 1/4-20 (or .250-20) UNC GO PD.2175

5.1 3.6 Thread Roots. The minor diameter of thread-setting plug gages shall be cleared beyond a PI8 width of flat either by an extension of the sides of the thread toward a sharp vee or by an undercut no wider than P/8.

The GO thread-setting plug gages for Classes 1A and 2A are under basic, having a common allowance. Accordingly, it is recommended that thegage beidentified by set plug nominal size, threadslin., thread series, GO, PD, and pitch diameter. 145

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

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(a) Thread-Setting Plug for Maximum-Material Functional Limit and Functional Size G O Thread Gages

(b) Thread-Setting Plug for Minimum-Material G a g e and N O T GO (LO)Functional Diameter Gages

FIG. 31 THREAD FORM OF TRUNCATEDTHREAD-SETTING

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PLUG GAGES

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GAGES AND GAGING FOR UNIFIED INCH SCREWTHREADS

ANSIIASME 61.2-1983 AN AMERICAN NATIONAL STANDARD

8 32 5 7 5 5 3 20 0 3 3 B 0 8

5

GAGES AND GAGING FOR UNIFIED INCH SCREWTHREADS

ANWASME BI -2-1983 AN AMERICAN NATIONAL STANDARD

Pt8 Ref.

P

"

I ief

(aIThread-Setting Plug for Maximum-Material Functional Limit and Functional Size GO Thread Gages

(b)Thread-Setting Plug for Minimum-Material Gages and NOT GO (LO)Functional Diameter Gages

FIG. 32 THREAD FORM OF FULL-FORM THREAD-SETTING PLUG GAGES

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,

. - , , ' i

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ASME B3.2

ANSIIASME B1.2-1983 ANAMERICANNATIONALSTANDARD

GAGESANDGAGING FOR UNIFIED INCH SCREW THREADS

5.1 5 Indicating Plain Diameter Gages Major Diameter of Product External Threads (Table 1 - Gage 5.1)

EXAMPLE: 1/4-20 (or .250-20) UNC 1A-2A GO PD.2164

The NOT GO (LO) thread-setting plug gage is different for each class and, accordingly, shouldbe identified by set plug nominal size, threadslin., thread series, class, NOT GO, PD, and pitch diameter.

5.15.1 Purposeand

EXAMPLE: 1/4-20 (or .250-20) UNC-2A NOT GO PD.2127

5.14 Plain Check Plug Gages for Thread Ring Gages

5.15.2 Basic Design. Indicating gages have three plain contacts at 120 deg. or two plain contacts at 180 deg. The dimensions of segments or rolls are to manufacturer's standard. See Fig. 33.

5.1 4.1 PurposeandUse. GO andNOT GO plain check plug gages verify the minor diameter limits of thread ring gages after the thread rings have been properly set with the applicable thread-setting plug gages.

5.1 5.3 Identification. Indicating gages,assem-

bled with propercontacts, should be tagged with nominal size, threads/in., thread series, class, major diameter limits, and MAJOR DIAMETER.

5.14.2 Basic Design. The direction of the gage

tolerances on GO and NOT GO plug gages for GO ring minor diameter andGO and NOTGO plain plug gages for NOT GO ring minor diameter is as follows: GO - tolerance plus; NOT GO - tolerance minus. Class X tolerance is used on gages up to No. 8 (0.164 in.) size. Class Y tolerance above No.8 (0.164 in.) size (see Table 8).

EXAMPLE: 1/4-20 (or .250-20) UNC-2A.2489-.2408 MAJOR DIAMETER

5 . 1 6 Indicating Gages to Check Minor Diameter of External Thread (Table 1 - Gage 5.2)

5.14.3 GageBlanks. Forstandardizationand economic reasons, the gaging members and handles have been standardized for various size ranges (see ANSI B47.1).

5.1 6.1 Purpose and Use. The maximum minor diameter limit of product external thread is considered acceptable if theproduct accepts GO thread gages, If further checking is required, the indicating gage with 55 deg. maximum included angle thread contacts is used to check the minor diameter.

5 . 1 4 . 4 Identification. The GO and NOT GO plain check plug gages for the GO thread ring gage should be marked with nominal size, threadslin., thread series, class, GO and NOT GO diameters, and GO minor diameter check plug. The GO and NOT GO plain check plug gages for the NOT GO (LO) thread ring gage should be marked with nominal size, threadslin., thread series, class, GO and NOT GO diameters, and NOT GO MINOR DIAMETER CHECK PLUG.

5.16.2 Basic Design. A thread indicating gage with segments or rolls has a thread form of 55 deg. maximum.There are usually threethreads in segments and three ribs on rolls. See Fig. 34. 5.1 6.3 Identification. Indicating gages,assembled with proper rolls, should be tagged with nominal size, threads/in., thread series, class, minor diameter limits (per customer's specifications), and MINOR DIAMETER EXTERNAL.

EXAMPLES: For GO ring: 1/4-20 (or .250-20) UNC-2A G0.1942 NOT G0.1947 GO MINOR DIAMETER CHECK PLUG For NOT GO ring: 1/4-20 (or .250-20) UNCQA G0.2019 NOT G0.2024 NOT GO MINOR DIAMETER CHECK PLUG

EXAMPLE: 1/4-20 (or ,250-20) UNC-2A (Minor diameter limits as specified by customer) MINOR DIAMETER EXTERNAL 148

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Measuring Procedures.

The indicating plain diameter gage inspects the major diameter of the external thread. After the plain contacts of the indicating gage are set to a plain diameter setting plug and the dialis read, the gage is placed on the product thread majordiameter for a second reading. The difference in readings is applied to the value of the set master to obtain the major diameter size.

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GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

ANSI/ASME B1.2-1983 AN AMERICANNATIONALSTANDARD

Segments

Two or Three Contacts

Rolls Two or Three

I

FIG. 33 INDICATING PLAIN DIAMETER GAGE - MAX.-MIN. MAJOR AND LIMIT SIZE 149

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DIAMETER

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Contacts

GAGESANDGAGING FOR UNIFIEDINCH SCREW THREADS

ANSI/ASME B1.2-1983 ANAMERICANNATIONALSTANDARD

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Total segment contact to be minimum 25% of circumference

FIG. 34 INDICATING DIAMETER GAGES - MAX.-MIN. MINORDIAMETER LIMITAND SIZE 150

-.

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GAGES AND GAGING FOR UNIFIED INCH SCREWTHREADS

ANSIIASME B I .2-1983 AN AMERICAN NATIONAL STANDARD

TABLE 12 CALIBRATION REQUIREMENTS A N D STANDARDS FOR X TOLERANCE THREAD GAGES, I N D I C A T I N G GAGES, PLAIN GAGES, AND MEASURING EQUIPMENT FOR EXTERNAL PRODUCT THREADS Thread Gages and Measuring Calibration Requirements Equipment (Nöte 1) Measuring Equipment

1

1.2

G O ring

NOT G O (LO) ring

Pitch (also helical offset at split; see A3.4), flank angles, minor diameter, pitch diameter, taper of pitch cylinder,straightness, roundness, clearance at root (Note 6)

W thread-setting plug for GO;

X tolerance plain diameter for

plug for minor small thread sizes

Pitch (also helical offset a t split; W thread-setting plug for NOT GO see A3.4), flank angles, minor (LO); X tolerance plain plug for diameter, pitch diameter, taper of minor diameter for small thread sizes pitch cylinder, straightness, roundness, clearance a t root (Note 6)

Thread snap gages

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2.1

G O segments

Pitch, flank angles, minor diameter, pitch diameter, taper, straightness, clearance a t root (Notes 4-6)

W thread-setting plug forGO (Note 7)

2.2

NOT G O (LO) segments

Pitch. flank angles, minor diameter pitch diameter, clearance a t root (Notes 4-6)

Wthread-setting plug forNOTGO (LO) (Note 7)

2.3

G O rolls (zero lead)

Pitch, flank angles, width of flat crest, at taper of pitch cylinder oneach roll, parallelism of axes of rolls, clearance at root (Notes 4-6)

W thread-setting plug forGO (Notes 7,8)

2.4

NOT G O (LO) rolls, (zero lead)

Pitch, flank angles, width of flatat crest, clearance at root(Notes 4-6)

W thread-setting plug for NOTGO (LO) (Notes 7,8)

2.5

Minimum-material, pitch diameter type, coneandvee

Pitch of vee, width of flat atcrest, height of thread (Notes 4-61

W thread-setting plug for NOT GO (LO)

Minimum-material, thread groove diameter type, cone only, “best size” thread wire

Radius of contacts corresponding to

W thread-setting plug for NOT GO (LO)

2.6

3

Setting Gages and Standards (Note 7)

Thread rings (ANSI 647.1)

1.1

2

for Gages and (Notes 2,3)

“best size” thread wiresize (Notes 4-6)

(Notes 7,8)

(Notes 7,8)

Plain diameter gages

3.1

Maximum plain cylindrical GO ring for major diameter

Taper, straightness, roundness, diameter

Series of plain plug gages i n 0.0001 in, steps or direct diametermeasurement with internal measuring equipment usinggage blocks equal to the maximum major diameter

Plain cylindrical NOT GO ring for major diameter

Taper, straightness, roundness, diameter

Series of plain pluggages i n 0.0001 in. steps or direct diameter measurement with internalmeasuring equipment usinggage blocks equal to the minimum major diameter

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GAGESANDGAGING FOR UNIFIEDINCHSCREWTHREADS

ANSI/ASME B I .2-1983 ANAMERICANNATIONALSTANDARD --`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

TABLE 12 CALIBRATION REQUIREMENTS A N D STANDARDS FOR X TOLERANCE THREAD GAGES, INDICATING GAGES, PLAIN GAGES, AND MEASURING EQUIPMENT FOR EXTERNAL PRODUCT THREADS (CONT’D) Thread Gages and Measuring Calibration Requirementsfor Equipment (Note 1) Measuring Equipment (Notes

2,3)

Setting Gages and Standards (Note 7)

type

Parallelism, flatness of contacts, distance between contacts

Plain Z tolerance plug gage or gage blocks with roll corresponding to maximum major diameter or direct measurement

3.3

Minor diameter snap type (55 deg. maximum included angle)

Pitch, diameter, included angle of thread form, clearance form at tips of snap contacts

Plain Z tolerance plug gage or gage blocks equal to the maximum minor diameter or direct measurement

3.4

Maximum and minimum major diameter snap type

Parallelism, flatness of contacts, distance between contacts

Plain i! tolerance plug gage or gage blocks with roll corresponding to maximum or minimum major diameter or direct measurement

3.5

Maximum and minimum minor diameter snap type (55 deg. maximum included angle)

Pitch, diameter, 55 deg. maximum included angle of thread form, clearance form at tips of snap contacts

Plain Z tolerance pLug gage or gage blocks equal to the maximum or minimum minor diameter

Pitch, flank angles, minor diameter, pitch diameter, taper, straightness, clearance at root, minor cylinder to pitch cylinder relationship of segments for coaxiality (Notes 4-6)

W thread-setting plug forGO

Pitch, flank angles, minor diameter, taper, straightness, parallelism of axes of rolls to each other, clearance of root (Notes 4-6)

W thread-setting plug forGO

Minimum-material, pitch diameter type, coneandvee

Pitch, width of flat at crest, height of thread (Notes 4-6)

W thread-setting plug forGO or

4.6

Minimum-material, thread groove diameter type, cone only (“best-size” thread wire size)

Radius of contact (Notes 4-6)

W thread-setting plug for NOT GO (LO) (Notes 7, 8 )

4.7

Major diameterand pitch diameter runout

Pitch and flank angles of thread segments, straightness of plain gages, major cylinder to pitch cylinder relationship ofsegments for coaxiality (Notes4-6)

None

3.2

4

Gagesand

Major diameter snap

Indicatingthread gages having either two contacts at 180 deg. or three contacts at 120 deg. 4.1

4.3

4.5

G O segments

GO rolls(zerolead)

gage

(Note 7)

(Notes 7,8)

for basic pitch diameter for NOT GO (LO) (Notes 7,8)

152

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GAGES AND GAGING FOR UNIFIED INCH SCREWTHREADS

ANSVASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

TABLE 12 CALIBRATION REQUIREMENTS A N D STANDARDS FOR X TOLERANCE THREAD GAGES, I N D I C A T I N G GAGES, PLAIN GAGES, AND MEASURING EQUIPMENT FOR EXTERNAL PRODUCT THREADS (CONT’D) Thread Gages and Measuring Equipment (Mote 1) 4.8

Differential segments and rolls

Calibration Requirementsfor Cages and Measuring Equipment(Notes 2,3)

GO profile of one pitch segment or roll requires flank angles checked CO full-form segments (see 4.1 above) GO full-form rolls (see 4.3 above) Minimum-material, pitch diameter type, cone and vee(see 4.5 above] Minimum-material, thread groove diameter type, cone only “best size” thread wire size (see 4.6 above)

Setting Cages and Standards (Note 7) Not required: special lead standards and flank angle standards with generated variation portion and near perfect portion

5.1

Major diametertype

Parallelism and flatness of contacts (Note 5)

Plain Z tolerance plug gage for GO or basic major diameter0 1 gage blocks

5.2

Minor diametertype

Pitch, diameter, 55 deg. maximum included angle of thread form, width of flat on crests

Plain Z tolerance plug gage for basic minor diameter at radiused root

6

Pitch micrometerwith standard contacts [approximately NOTGO (LO) profile] cone andvee

Pitch, flank angles. Maximum errorin indicated measurements up to1.000 in. shall not exceed 0.00012 in. for pitches up to 40 TPI, 0.00015 in. for pitches greater than 40 TPI and up to 14 TPl,.and 0.0002 in. for pitches greater than 14 TPI. For measurements greater than 1.000 in., error may be increased by0.00004 in.

W thread-setting plug forbasic pitch diameter, or G O pitch diameter standard or NOTGO (LO) (Note 7)

7

Pitch micrometerwith modified contacts (approximately pitch diameter contact) cone and vee

Pitch, flank angles, width of flata t crest, height of thread, maximum error i n indicated measurements up to 1.000 in. shall not exceed 0.00012 in. for pitches up to40 TPI, 0.00015 in. for pitches greater than40TPI and up to 14 TPI, and 0.0002 in. for pitches greater than 14TPI. For measurements greater than 1.000 in., error may be increased by 0.00004 in.

W thread setting plug forbasic pitch diameter, o r GO, or NOTGO (LO) (Note 7)

8

Thread measuring wires (“best size” thread wire size) with suitable measuring means

Flatness and parallelismof spindle and anvil faces, screw calibration, measuring force

Calibrated “best size” thread wire size measuring wires and gage blocks

9

Opticalcomparator or toolmaker’s microscope with suitable fixturing

Micrometer stage, magnification, radius chart, protractor head (Note4)

Gage blocks, plug gages, sine bar

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5Indicatingplaindiameter gages

ANSI/ASME B I .2-1983 AN AMERICAN NATIONAL STANDARD

TABLE 12

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

CALlBRATlON REQUIREMENTS AND STANDARDS FOR

X TOLERANCE THREAD GAGES,

INDICATING GAGES, PLAIN GAGES, AND MEASURING EQUIPMENT FOR EXTERNAL PRODUCT THREADS (CONT’D) Gages and (Notes 2,3)

Thread Gages and Measuring Calibration Requirementsfor Equipment (Note 1) Measuring Equipment Profile tracing equipment with fixturing suitable

10

Use manufacturer’s instructions to test stylus traverse and . electronic amplification

Setting Gages and Standards (Note 7) Special angle block supplied with instrument

11

Lead measuring machine with suitable fixturing

Traversing system, straightness of ways, Lead stylus radius

standard, gage blocks

12

Helicalpathattachment used with GOtype indicating gage

Lead, flank angles, taper, straightness, Lead clearance at root (Notes 4, 5)

standard

13

Helicalpath

Use manufacturer’s instructions to test Lead the mechanical and electronic features

standard

14

Plain micrometerand calipers, modified as required

Maximum indicated error in measurements up to 1.000 in. shall not exceed 0.00012 in. for pitches up to 40 TPI, 0.00015 in. for pitches greater than 40 TPI and up to 14 TPI, and 0.0002 in. for pitchesgreater than 14 TPI. For measurements greater than 1.000 in., error may be increased by 0.00004 in.

Gage blocks, or calibrated plain Plug gages

15

Surface measuring equipment

Use manufacturer’s instructions for calibration procedures

Precision roughness standard

16

Roundness equipment

analyzer

Use manufacturer’s instructions for magnification procedures calibration

Precisionsphere, glass

NOTES: See Table 1. Use applicable X, W, or Z gage tolerance. Taper, straightness including bellmouth barrelshape and hourglass shape, and roundnessshall be within theX,W,or Z tolerance depending on the element measured. In other words, if these features are measured at pitch cylinder, the tolerance for pitch diameter applies. Use manufacturer’s recommended procedures forgage for checking the threadfeatures and alignment of indicating gage components. New rolls andsegments shall be within X tolerance. Worn rolls or segments shall be replaced when a single thread element wears outside of X tolerance. Pitch diameter is usually transferred from thread-setting gages. When the gage is set by adjustment based upon actual measured pitch diameter of the setting master, the master shall meet all W tolerances except for pitch diameter, which may have a tolerance increased to X. Pitch diametersize on some adjustable threadsnap gagesand indicating thread gages may beset from one or more of the following: (a) tolerance plain cylindrical plug gage (b) gage blocks ( C ) direct measurement (d) specially designed transfer standards Rolls must be qualified for setting from their outside diameters.

z

154 --`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

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roundness standard

4 W

ASME B392 83 2575532 OOZ383b

GAGES AND GAGING FOR UNIFIED INCH SCREWTHREADS

ANSVASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

TABLE 13 CALIBRATION REQUIREMENTS A N D STANDARDS FOR X TOLERANCE THREAD GAGES, INDICATING GAGES, PLAIN GAGES, AND MEASURING EQUIPMENT FOR INTERNAL PRODUCT THREADS Thread Gages and Measuring Calibration Requirementsfor 1) Measuring Equipment Equipment (Note

Gages and (Notes 2, 3)

Setting Gages and Standards

1 Thread plug (ANSI 847.2)

2

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3

1.1

G O plug

1.2

NOT G O

(HI) plug

Lead, flank angles, major diameter, pitch diameter, taper, straightness, gage roundness, clearance a t root

Three “best size” thread wires, blocks

Lead, flank angles, major diameter, pitch diameter, taper, straightness, roundness, clearance at r o o t

Three “best size” thread wires, gage blocks

Solid W thread-setting ring forGO (if direct measurementof pitch diameter is not made) (Notes 6, 8 )

Thread snap gages 2.1

G O segments

Lead, flank angles, major diameter, pitch diameter, taper, straightness, clearance at root(Note;4, 5)

2.2

NOT G O (HI) segments

Pitch, flank angles, major diameter, pitch diameter, clearance at root (Notes 4, 5)

2.3

G O rolls(zero lead)

Pitch, flank angles, width of flatat crest, taper of pitch cylinder on each roll, straightness,parallelism of assembled rolls, clearance at root (Notes 4, 5)

Solid W thread-setting ring for GO (Notes 6, 8 )

2.4

NOT GO (HI) rolls (zero lead)

Pitch, flank angles, width of flata t crest, clearance at root (Notes 4, 5)

Solid Wthread-setting ring for NOTGO (HI) (Notes 6, 8 )

2.5

Minimum-material, pitch diameter type, cone and vee

Pitch, width of flatat crest, height of thread (Notes 4,s)

Solid W thread-setting r i n g f o r N O T G 0 (HI) (Notes 6, 8)

2.6

Minimum-material, thread groove diameter type, cone only (“best size” thread balls)

Radius of contacts (Notes 4,5)

Solid W thread-setting ring for NOT GO (HI] (Notes 6, 8 )

Solid Wthread-setting ring for NOTCO (HI) (if direct measurement of pitch diameter i s not made) (Notes 6, 8)

Plain diameter gages 3.1

Minimum plain cylindrical plug for minor diameter

Taper, straightness, roundness, diameter

Gage blocks

3.2

Minimum major diameter snap type (55 deg. maximum included angle)

Pitch, included angle, dimension over segments or rolls, width of flatat

Plain Z tolerance ringgage for GO major diameter or gage blocks

Minimum minor diameter snap type

Taper, straightness or coaxiality of cylindrical segments or rolls, between dimension over segments or rolls (Note 4)

3.3

crests (Note 4)

between jaws

Plain Z tolerance ring gage for GO minor diameter or gage blocks jaws

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J,

J

ASME B102 8 3

m 2595512

001r1817 b

ANSI/ASME B1.2-1983 AN AMERICAN NATIONAL STANDARD

GAGES AND GAGING FOR UNIFIED INCH SCREW THREADS

TABLE 13 CALIBRATION REQUIREMENTS A N D STANDARDS FOR X TOLERANCE THREAD GAGES, INDICATING GAGES, PLAIN GAGES, AND MEASURING EQUIPMENT FOR INTERNAL PRODUCT THREADS (CONT’D) Thread Gages and Measuring Calibration Requirementsfor Equipment (Note 1) Measuring Equipment

Gagesand (Notes 2, 3)

Setting Gages and Standards

3.4

Maximum and minimum major diameter snap type (55 deg. maximum included angle)

Pitch, included angle, dimensionover segments or rolls, width of flatat crests (Note 4)

Plain Z tolerance ring gage for GO major diameter; plain Z tolerance ring gage for NOT GO (HI) major diameter or gage blocks between jaws

3.5

Maximum and minimum minor diameter snap type

Taper, straightness, coaxiality of cylindrical segments or rolls, dimension over segments or rolls (Note 4)

Plain Z tolerance ring gage for GO minor diameter; plain Z tolerance ring gage for NOT GO (HI) minor diameter or gage blocks between jaws

4.1

GO segments

Lead, flank angles, major diameter, pitch diameter, taper, straightness, clearance at root, major cylinder to pitch cylinder, relationship of segments for coaxiality (Notes 4, 5)

Solid W thread-setting ring for GO or basic pitch diameter (Notes 6-8)

4.3

GO rolls(zero lead)

Pitch, flank angles, major diameter, taper, straightness, clearance at root, parallelism of axes of rolls to each other (Notes 4, 5)

Solid W thread-setting ring forGO (Notes 6, 9)

4.5

Minimum-material, pitch diameter type, coneandvee

Pitch, width of flat at crest, height of thread (Notes 4, 5)

Solid W thread-setting ring forGO or NOT GO (HI) or basic pitch diameter (Notes 6, 9)

4.6

Minimum-material, thread groove type, cone only

Radius of contacts (Notes 4,5)

W thread-setting ring for NOTGO (HI) (Notes 6, 9)

Minimum-material, thread groove type, three “best size” thread balls, two ball contact spaced four pitches

Ball diameter (Notes 4, 5)

Plain Z tolerance ring gages whose diameter is basic pitch diameter plusthe “best size” thread ball size

Minor diameterand pitch diameter runout gage

Straightness of plain gage segment, pitch, flank angle, straightness of thread segment, minor cylinder to pitch cylinder, relationship of segments for coaxiality (Notes 4, 5)

None

4.7

156

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--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

4Indicatingthread gages having either two contacts at 180 deg. or three contacts at 120 deg.

GAGES AND GAGING FOR UNIFIED INCH SCREWTHREADS

ANSI/ASME 61.2-1 983 AN AMERICAN NATIONAL STANDARD

TABLE 13 CALIBRATION REQUIREMENTS A N D STANDARDS FOR X TOLERANCE THREAD GAGES, INDICATING GAGES, PLAIN GAGES, AND MEASURING EQUIPMENT FOR INTERNAL PRODUCT THREADS ICONT’D) Thread Gages and Measuring Calibration Requirementsfor Gagesand 1) Measuring Equipment (Notes Equipment (Note 4.8

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5Indicating gages

Differential segment GO or roll

2,3)

profile of o n e pitch in length, segment or roll, requires flank standard checked angles G O full-form segment (see 4.1 above) G O full-form roll (see 4.3 above) Minimum material, pitch diameter type, cone and vee, (see 4.5 above) Minimum material, thread groove type, cone only, (see4.6 above)

Standards Setting and Gages Not required: special internal lead internal standard and flank angle with errors generated portion and near perfect portion

plain diameter

5.1

Majordiametertype (55 deg. maximum included angle)

Pitch, included angle of flanks, width of flat on crests

Plain Z tolerance ring gagefor basic major diameter or G O major diameter, gage blocks, direct measurement

5.2

Minordiametertype

Straightness, parallelism of contacts (Note 5)

Plain Z tolerance ring gage for basic minor diameter, gageblocks, direct measurement

6

Internal pitch micrometer with standard contacts (approximately NOT G O (HI) profile) cone and vee

Pitch, flank angles, maximum error in indicated measurement in t h e micrometer head shall not exceed over 0.0002 in.

Solid W thread-setting ring gage for basic pitch diameter, measurement wires (Note 6)

7

Internal pitch micrometer with modified contacts (approximately pitch diameter contact) cone and vee

Pitch,flank angles,width of flat at crest, height of thread. Maximum error in indicated measurement in the micrometer head shall not exceed 0.0002 in.

Solid W thread-settingringgage for basic pitch diameter (Note 6)

8

Threadmeasuring ball with suitable measuring means

Flatness and parallelism of internal anvils, screw calibration, measuring force

Gage blocks, calibrated “best size” thread balls

9

Opticalcomparator or toolmaker’s microscope with suitable fixturing and cast replica

Micrometerstage,magnification,radiusGage protractor chart, (Note head 4)

Profile tracingequipment with suitable fixturing

Use manufacturer’sinstructions stylus electronic instrument and traverse amplification

10

totest

blocks, plug gages, sine bar, stage micrometer

Special angle block supplied with

157

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GAGES AND GAGING FOR UNIFIED INCH SCREWTHREADS

--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

ANSI/ASME B I .2-1983 AN AMERICAN NATIONAL STANDARD

TABLE 13 CALIBRATION REQUIREMENTS AND STANDARDS FOR X TOLERANCE THREAD GAGES, I N D I C A T I N G GAGES, PLAIN GAGES, AND MEASURING EQUIPMENT FOR INTERNAL PRODUCT THREADS (CONT'D) Thread Cages and Measuring Calibration Requirementsfor 1) Measuring Equipment Equipment (Note

11 Lead measuring machine with fixturing suitable

Traversing system, straightness of ways, Lead stylus radius

12

Helical path

analyzer

13

Plain internal micrometer and Maximum error calipers modified as required ment

14

Surface measuring equipment

15

Roundness equipment

Cagesand (Notes 2, 3)

Use manufacturer's instructions to test the mechanical and electronic features

i n indicated measurein the micrometer head shall not exceed 0.0002 in.

Use manufacturer's instructions for calibration procedures

Use manufacturer's instructions for magnification procedures calibration

Setting Cages and Standards standard gage blocks

Lead standard

Gage blocks, or calibrated plain P b gages

Precision roughness standard

Precision glass sphere, roundness standard

NOTES: (1) See Table 2. (2) Use applicable X, W, or Z gage tolerance. (3) Taper, straightness including bellmouth barrel shape and hourglass shape, and roundness shall X, W, or Z tolerance depending on the element measured. In other words, if these be within the features are measured at pitch cylinder, the tolerance for pitch diameter applies. (4) Use manufacturer's recommended procedures for gage for checking the thread features and alignment of indicating gage components. (5) New rolls and segments shall be within X tolerance. Worn rolls or segments shall be replaced when a single thread element wears outside of X tolerance. (6) Pitch diameter is usually transferred from thread-setting gage, (7) When the gage i s set by adjustment based on actual measured pitch diameter of the setting master, the master shall meet all W tolerances except for pitch diameter, which may have a tolerance increased to X. (8) Pitch diameter size on some types of adjustable gages may be set from 2 tolerance plain ring gages or direct measurement. Rolls must qualify for setting from their outside diameters. (9) Pitch diameter size may be set by direct measurement over wires on 180 deg. segments, with gages when rolls are qualified specially designed transfer standards or byZ tolerance plain ring for setting from their outside diameters.

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f

’

ASME B 3 .82235 7 5 5 3020 3 3 8 2 0

b M

ANSIJASME B1.2-1983 ANAMERICANNATIONALSTANDARD

GAGESANDGAGING FOR UNIFIED INCH SCREW THREADS

TABLE 14 CALIBRATION REQUIREMENTS FOR THREAD- A N D PLAIN-SETTING GAGES Setting Gage

Calibration Requirements

GO, N O T GO (LO) and W thread setting plug gage, truncated and form full

Lead, flank angles, major diameter, pitch diameter, taper, straightness and roundnessof major and pitch cylinders,clearanceatroot,coaxialityof major cylinder with pitch cylinder

GO, N O T GO (HI) and solid W thread-setting ring

Lead,flank angles, minor diameter, pitch diameter (Note?),taper,straightness

gage

Plain 2 tolerance plug and ring gages

and roundness of minor and pitch cylinders, clearance at root, coaxiality of minor cylinder with pitch cylinder Diameter, taper, straightness, and roundness

NOTE: (1)

Pitch diameter of an internal thread, measured by “bestsize”thread ball contacts, will beO.OOO1 in. to0.0002 in. larger than the pitch diameter, gaged indirectly by a snug-fitting master thread plug gage or locked segments of an indicating gage which have been measured by “best size” thread wire method. Thisdifferenceis due to the functional size of the master thread plug gage or locked segments which unavoidably have small deviations in lead, flank angle, taper, and roundness.

for softer product thread materials due to the possibility of the wires being forced into the surface of the thread flanks, This would indicate a smaller thread size than what actually exists. See Appendix B.

5 . 1 7 Thread Micrometers (Table 1 - Gages 6, 7, and 14) 5.17.1 Purposeand Use. Thread micrometers with cone and vee anvils are used to inspect the minimum-material pitch diameter limit and size of external thread. Micrometer can check 180 deg. ovality of pitch diameter and taper of pitch diameter. Modified vernier calipers are used similarly.

5.1 9 Optical Comparator and Toolmaker‘s Microscope (Table 1 - Gage 9)

5.17.2 Basic Design. The depth of thread on cone and vee is either approximately pitch diameter contact or the NOT GO (LO) limit profile. Measurements are made in 0 in, to 1.000 in., and 1.000 in. to 2.000 in. diameter ranges. The smallest graduation is 0.0001 in.

5.19.1 Purpose and Use. The optical comparator magnifies and projects the thread profile on a screen. For best profile image, the threaded item is positioned so that the light is aligned with the thread lead angle. Since the thread profile is defined in a plane including the axis, a correction factor may be added to the measured flank angle observed normal tothe leadangle. For most standard single lead threads, the correction factor is lessthan 0 deg. 5 min. Optical comparators aregenerally fitted with lenses providing various magnifications between 1OX and IOOX. Profile dimensions are checked using appropriate linear and angular scales on the machine and by the application of thread profile, radius, and other overlay charts. Other groove and ridge dimensions, and axial plane pitch and lead may be checked. Major, minor, and pitch diameters are identified, then measured using table traverse readouts.

5.18 Thread-Measuring Wires (Table 1 - Gage 8) 5.1 8.1 Purpose and Use. Using a measuring machine, product thread can be checked using three measuring wires between product thread andparallel flat anvils of measuring machine.Wires are “best size” thread wire contacting at the thread groove diameter, with two wires on one side and one wire 180 deg. around, This type of measurement checks the minimum-material groove diameter limit and size. By rotating the product thread betweenwires, the 180 deg. ovality of groove diameter is checked. Measuring at different locations axially, the taper of the groove diameter is checked. It should be recognized that the measuring force shown for measuring hardened thread gages with wires may not be appropriate

5.19.2 The toolmaker’s microscope is similar in function to the optical comparator but does not include screen projection or overlay charts. Magnifications are generally lower than those of optical comparators. Some microscopes have thread profile and radius templates which are inserted in the eyepiece. ‘

159 --`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

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ASME B 3 9 2 8 3

m

2 5 7 5 5 3 20 0 3 3 8 2 1

8

GAGES AND GAGING FOR UNIFIED INCH SCREWTHREADS

ANSI/ASME B I .2-1983 AN AMERICAN NATIONAL STANDARD

5 . 2 0 Profile Tracing Instrument (Table 1 - Gage 10) 5.20.1 Purpose and Use. The instrument checks thread contours to anaccuracy of 0.0002in. for 1.000 in. of horizontal and 0,100 in, vertical travel at lOOX magnifications. The chart paper trace may be analyzed for elements of the thread profile, including depth, crest width, lead, angle, and radius at root of thread. Indicator

GO Indicating gage

5 . 2 1 Electromechanical Lead Tester (Table 1 - Gage 1 Ir) 5 . 2 1 . I PurposeandUse. The electromechanical lead tester consists of a precision, direct-reading headstock in combination with an axially movable carriage supporting a sine bar, two work-mounting centers, electronic thread locating head with a ball point and a milliammeter for registering the center position of the ball probes in the thread groove. Ball point stylus approximates the "best size" thread wire radius. To extend lead measurements beyond 1 .OOO in., gage blocks in 1.000 in. steps are used to displace the screw thread. Lead measurements accurate to 0.00002 in. are read directly from micrometer scales on headstock.

Top gaging element

Lower gaging element

FIG. 35INDICATING GAGES - HELICAL PATH ATTACHMENTUSEDWITHGO TYPE INDICATING GAGE 5 . 2 2 Helical Path Attachment Used With GO Type Thread Indicating Gage (Table 1 - Gage 12) 5.22.1 Purpose and Use. To observe the presence of helical path variation with a GO type indicating gage, Fig. 35, the following procedure is used: ( U ) a suitable means is used to lock (restrict) axially the lower gaging element; (b) the top gaging element is allowed to floatfreely (axially) on its own stud and at least one full pitch away from the frame; (C) the product to be inspected is inserted into the gaging elements so that theconditions described in (a) and (b) above are met; (a) an indicator (usually attached to the comparator) is positioned so that the indicator contact point locates at the face of the free floating (top) gaging element; (e) the product is turned one full revolution. The presence of helical pathvariation causes the topgaging element to displace itself axially on its own stud. Cf) the full-indicator movement is observed.

5.23.1 Purposeand Use. A helical pathanalyzer is a self-contained unit consisting of a motordriven headstock, tailstock, electronic gaging head, sinebar, follower, pitch blocks, selsyn transmitter for chart recorder, and operator control panel. The external workpiece to be measured is mounted between centers. The motor-driven headstock rotates the part through three revolutions at one setting. At the same time, this rotary motion is transmitted to the chart drive of the recorder. Simultaneously, the driving ribbonrunning off the headstock actuates the sine bar laterally on a ball slide in direct proportion to the spindle rotation. The sine bar is set previously to the proper angle for the particular pitch using the applicable pitch block. The electronic gage head floats axially on ball slides, the movement being controlled by constant spring pressure of the sine bar follower against the sine bar. 160

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--`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

5.23 Helical Path Analyzer (Table 1 - Gage 13)

ASME BL.2 83

2575522 OU33822 T

ANSVASME 61.2-1 983 ANAMERICANNATIONALSTANDARD

GAGESANDGAGING FOR UNIFIED INCH SCREW THREADS

The chart gives readings in lead variation and socalled drunken thread variation. Chart division is equal to 0.00002 in. per division.

stylus coupled to an electric unit records the out-ofroundness on a circular chart as it traces around the cylindrical surface of the workpiece. The instrument provides a series of magnifications for stylus displacement, a filtering system for isolating lobing from surface irregularities, various means for centering the amplified stylus trace on the polarchart, and a selection of rotating speeds. For details on measuring and for other methods for checking roundness, see ANSI B89.3.1, Measurement of Out-of-Roundness.

5.24 Surface Roughness Equipment (Table 1 - Gage 15) 5.24.1 Purpose and Use. Measurement of surface roughness on screw thread flanks is usually made with an instrument which traverses a radiused stylus across the lay. The stylus displacement due to the surface irregularities is electronically amplified and the meter reading displays the arithmetical average roughness height in microinches (see ANSI B46.1 Surface Texture: Surface Roughness, Waviness and Lay). Some instruments produce a chart of the traced path which shows the peak-to-valley heights of the surface irregularities. Special fixturing is required to position and guide stylus over thread surface.

5.26 Miscellaneous Gages and Gaging Equipment 5.26.1 The description of the external gages, as noted in 5.1 through 5.25, is definitely not a complete catalog of the various types available for inspection purposes. The gages not described above may be used provided they adhere to the standard thread practice noted in this Standard (i.e., truncation, form of thread, tolerances, etc.) and have producer and consumer agreement.

5.25 Roundness Equipment (Table 1 - Gage 16)

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5.25.1 Purposeand Use. There are two types of precision roundness measuring instruments: precision rotary tables and precision spindles. A special

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161

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ASME B I - 2 83 W 2595522 0 0 2 2 8 2 3

I W

APPENDIX A CALIBRATION AND INSPECTION OF LIMIT GAGES, . SNAP GAGES, INDICATING GAGES, AND MEASURING INSTRUMENTS

A I GENERAL

measurements are made ona pitch-testing machineby using a hardened steel stylus with a radius matching the “best size” thread ball. Thestylus, which contacts both the leading and followingflanks, engages selected complete threads at the pitch line in a direction parallel to the axisof the gage. The measurements are made at both of ends the gage and oneor more positions in between along oneline; then they are repeated along anotherline at 180 deg. around thegage. The meanof the two-setsof readings is takeninorder to eliminate the effect of any misalignment of the measuring axis with respect to the gage axis. The importance of pitch measurement is to estimateits effect on functional size. Thediameter equivalent of a pitch variation of 0.0001 in. is 0.00017 in. Since gages have very small pitch tolerances, the measurement of pitch by opticalprojection is not recommended.

There are more ways to calibrate gages than those briefly described herein. Since this Appendix covers only the most commonly used designs of limit, snap, and indicatinggages, the inspectormay haveto modify the method described to become applicable. Special fixturing may be necessary for the small and large gages. Specially designed screw thread indicating gages may at times be more practical for making measurements on thread gage elements than the cumbersome all-purpose laboratory instruments which may lack adequate fixturing to do anefficient job. Before one calibrates, sets, or uses limit, snap, and indicating gages, they shouldbe cleaned and examined visually for nicks, burrs, and foreign matter, using a minimum of 1OX magnification.Defects mustbe corrected.

A 2 . 3 Helix Variation Measurement A 2 THREAD PLUG GAGE CALIBRATION

GO and NOT GO (HI) GO and NOT GO (LO) GO and NOT GO (LO)

Helical variation may be measured with helix measuring machines oron special fixturedindicating gages. Manufacturer’s instructions should be used.

Thread Plug Gages TruncatedSettingPlug Thread Gages Full-FormThread-Setting Plug Gages

A2.4 Major Diameter Measurement

A2.1 ExternalPitch Diameter Measurement

Theformulaand diameteronthread Appendix B.

method of measuringpitch pluggages are describedin

A 2 . 2 Pitch Variation Measurement

Only those thread plug gages that have their centers intact can be mounted oncenters for evaluation, The

The measuring instrument is set with gage blocks, cylindrical standards, or cylindrica1 standard andgage blockcombination which approximatethemajor diameter size. Then the outside diameter of the thread is placed betweenparallelanvils of ameasuring machine or micrometer. The measuring faces are brought into contactwith the- threads using the specified measuring force. Additional readings are taken along the axis and around the gage verify to that the variations in roundness and taper are within the major diameter tolerance.

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(This Appendix is not parf of American National Standard Gages and Gaging for Unified Inch Screw Threads, A N W A S M E 61.2-1983, and is included for information purposesonly.)

TABLE A I

MINIMUM M A G N I F I C A T I O N TPI

More than14 14-40 40 and less

readings obtained by rotating the threadedgage until the maximum and minimum values are found. The maximum difference in measurements shall be within the runout tolerance between the major cylinder and pitch cylinder.

Minimum Magnification 20x 50X

1oox

A2.8 Minor Diameter Measurement

Minor diameter can be measured with measuring machine or micrometer,providedspecial 55 deg. maximum conical contacts with radius or small flat tips are used. Gage axis must be mounted normal to the measuring screw axis. A gage block combination corresponding to thebasic minor diameter should be used to set the measuringscrew. Optical projection may be used also.

A2.5 Thread Form

Thread formis checked by either optical projection or toolmaker’s microscope. After the recommended magnification is selected, the profile may be compared to threadtemplates,andtherootradiusmaybe compared to a series of radii on a chart.The truncation, width of flat, and root clearance canbe measured by using the micrometer screws to translate the image of the thread feature with respect to cross lines in the projector or hairlines in the microscope.

A3 THREAD RING GAGE INSPECTION

GO and NOT GO (LO) Thread Ring Gages GO and NOT GO (HI) Thread-Setting Ring Gages

A 2 . 6 Flank Angle Measurement

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A 2 . 6 . 1 If bothcentersareavailable,theflank angles may be measured by opticalprojection or toolmaker’s microscopeusing magnifications shownin Table A l . The plug gage is mounted on thecenters in a fixture which can be tilted to thehelix so that both flanks are in focus. See corrective angles shown in Table A2. The leading and following 30 deg. angles are each measured with respect to themajor cylinderor axial to the thread axis. The protractor head should read out to 1 min of arc. Thecross lineor hairline is set parallel to the thread feature permitting a very narrow slit of light between. If thethreadflank is notstraight,the inspector may either position the line to average out the flank irregularitiesor measure both the addendum and dedendum flank angles.

A 2 . 6 . 2 Profile tracing equipment is available for making profile charts of each flank on10 threads/in. and coarser.

A3.1 InternalPitch Diameter Measurement A3.1.1 Measurement of internal pitch diameter has seldom been practiced in the United States because instrumentation has not been readily available. Thus, the pitchcylinder is transferred to split ringgages from the GO and NOT GO (LO) thread-setting plugs by adjustment. Solid working and setting ringgages are sized by lapping untila light drag is noticed as they are screwed on the settingplugs. Sizes under 3/ 16 in. can only be gaged with plug gages. A 3 . 1 . 2 The measured pitch diameter on rings fitted to a setting plug maybe 0.0001 in. to 0.0002 in. larger than themeasured pitch diameter on the plugbecause the pitch diameterequivalents from permissible pitch, lead, and flankangle tolerances on matched plug and ring cause some unavoidable discrepancy. A 3 . 1 . 3 Measurement of internalpitchdiameter using “best size” thread ball is restricted to sizes from 3/ 16 in. and larger. Itis measured with ball contacts moÜnied to caliper jaws and coupled to anindicating gage. One jaw hasa fixed balland the other jaw a pair of floating balls with center spacing of two or more pitches. The caliperjaws are usually set to zero on an X tolerance plain ring whose diameteris the sum of the basic pitch diameter of the gage plusone-half the “best size” threadballdiameter.The ball contactsare brought in contact with the flanks of the internal

A 2 . 7 Runout Between Major Cylinder and Pitch Cylinder

The fixedanvil of themeasuringinstrumentor micrometer engages the majorcylinder of the gage, and the movableanvilstraddlestwothread-measuring wires which are pressed against the pitch cylinder with a force appropriate for pitch diameter measurement. This reading is taken and is followed by a series of 164 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

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5 W

ASME 8 3 .8235 7 5 5 3020 3 3 8 2 5

TABLE A2 60 deg. INCLUDED THREAD ANGLE Correction Helix Angle

Correction Helix Angle ~~

deg,

min.

deg.

deg.min. min.

min.

2 2 2 2 2 2

10 20 30 40 50

3 3 3 3 3 3

~

deg.

18

1 1 1 1

54 4 14 24 36 48

10 20 30 40 50

2 2 2 2 3 3

2 16 31 47 4 21

4 4 4 4 4 4

10 20 30 40 50

3 3 4 4 4 5

38 56 16 29 35 30 56 18 31

11 11 11

11 11

20 30 40 50

5 5 5 5 5 5

10 20 30 40 50

5 6 6 6 7 7

40 2 27 34 31 35 17 43 37

12 12 12 12 12 12

10 20 30 40 50

8 8 9 9

10 37 39 5 40 35 5 35 43

13 13 '13 13 13 13

10 20 30 40 50

I1 11

6 38 12 46 20 55

14 14 14 14 14 14

10 20 30 40 50

14 15

31 8 46 24 2 42

6

10 10

6 6 6 6 6

10 20 30 40 50

12 12 13 13

7 7 7 7 7 7

10 20 30 40 50

15 16 17 17

8 8 8 8 8 8

10 20 30 40 50

0 1

19 19 20 21

23 24 25 26

9 9 9 9 9 9

10 20 30 40 50

10 10 10 10 10 10

10 20 30 40 50

11

45 46 47 48 50

22

IO

25

27 28

30

32 33

36

38

15

165 --`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

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41 42

23 4 46 29 12 57 42 28 15 2 50 38 28 19 11 2 55 47 42 37 33 29 27 25 23 23 25 25 26 30

44

33 37 42 47 55 2

51

10

ASME B 3 - 2 83

2 5 7 5 5 3 2 0033826 7

m

LENGTHS O F A C D TAPERLOCK AND TRILOCK THREAD PLUG GAGE BLANKS SELECTED FROM ANSI B47.1

Thread Sizes

I

Decimal Range

I

Thread lengths

T

Thread Plug Gages

Fine-Pitch Instrument Thread Plug Gages

To and Above

Including

1

2

1

CO

NOTCO(H1)

CO

NOTCO(H1)

3

4

5

6

in.

in.

in.

in.

0.059 0.105 0.150 0.230

0.105 0.150 0.230 0.365

1/4

V1 6

in. V16

a/'

5h6

7/32

7/32

5/32

3/32

9/32

9/32

7/32

V2

716

5116

Y4

0.365

0.510 0.825 1.135

3/4

V8

716

17/8

Y2

Y8 7/16

0.510 0.825

78

12 TPI and finer 1 .I 35

1.510

1

7 TPI

and coarser 1.510 2.010 2.510 3.010

2.010 2.510 3.010 12.010

1 7/8 2 2% 2l/4

in.

Coarser than 12 TPI

1'/4

3/4

Finerthan7TPIand coarser than 16 TPI

16TPI and finer

1 V4 1 V8 1 V2

7/8

1

1 1/2

1

7/8

V4

1/2

7/8 7/8 1 1

GENERAL NOTE: For trilock plug blanks above 0.760 in. to and including 1.510 in., and wire type plug blanks in sizes below 0.760 in., see ANSI B47.1.

thread. A series of measurements are made around the A 3 . 3 Helix Variation Measurement gage at both ends and in the middle. The indicator Helical variations are measured on a special fixtured reading gives the variation from thesize to which the indicating gage. Manufacturer's instructions shouldbe gage was set. used. A 3 . 2 Internal Pitch Variation Measurement A3.4 Helix Offset Measurement on Adjustable The groundface of the threadring gage is clamped to Thread Ring Gages a face plate and mounted normal to the measuring axis When an adjustable thread ring gage is reset, the of the pitch-testing machine. A modified stylus with helix offset at the split line must be checked and may "best size" thread ball radius is needed to contact the not exceed the X toleranceforpitch.One way to internal threads. Measurements are made along one line parallel to thread axisat two or more intervals,and measure the misalignment is to screw the adjustable ring partially onto its setting plug, which then these same intervals are measured on anotherline is clamped to after rotating the gage 180 deg. The means of the a vee block ona surface plate. With the of face the ring variations of correspondingintervalsaretaken to gage parallel to the surface plate, allow the spherical eliminate the effect of misalignment of measuring axis probe of an electronicheight gage to contact the exposed thread flank near edge the of the slit. Note the with gage axis. 166 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

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TABLE A3

m

reading. Next, slowly rotate the ringso that the probe A 3 . 9 Runout Between Minor Cylinder crosses the slit and rests on the thread flank again and and Pitch Cylinder note the reading. Thedifference in readings shall not Horizontally clamp handle end of setting plug in vee exceed X tolerance forlead. Sometimes the offset can block whichis clamped on a surface plate. Next, screw be realigned by resetting and gently tapping it into thread ring gagepart way onto plug. Lubricate threads alignment and relocking the gage. of electronic if there is a snug fit. Position ball contact height gageon the exposed minor cylinder of the ring gage. Next, slowly rotate ring toobtainthe fullA3.5 MinorDiameter indicator reading for the runout. Thereare varieties of internal gages with plain cylindrical segments coupled to mechanical and electronic indicators which are suitable for the measurement. The indicating gages are set to a master gage A4 PLAIN PLUG GAGE CALIBRATION made with parallel jaws attachedto gage block combinations corresponding to the basic minor diameter, GO and NOT GO Plain Plug Gages, Z Tolerance Measurements are madeto locate the maximum and GO and NOT GO Plain Setting and Check Plug minimumdiameters to prove thatthe ringminor Gages, X and Y Tolerances diameter is within tolerance. A4.1 Outside DiameterMeasurement

A3.6 Thread Form

A4.1.1 The Z tolerancepluggage is measured between flat parallel contacts of a micrometer which has a resolution of 0.00004 in. The micrometer is set with a tolerance Grade 3 gage block close to thesize of the plug to minimize errorin micrometer screw. Readings around and along plug the are taken verify to that the gage is within Z tolerance.

Castsmade of nonshrinkingandnondeforming material such as dental plaster, selected resins, and silicone are necessary to evaluate thread form. The profiles are examined by opticalprojection or by toolmaker’s microscope. Thread form templates are used for comparisonpurposes. Also, truncation, width of flat, and-root clearance can be measured with the micrometer-driven table.

A 3 . 7 Flank Angle Measurements

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Casts are required. Theyare mountedwith plasticine to a fixture which can be tiltedthe in field of the optical projector or toolmaker’s microscope. Further details are given in A2.6. Profile,tracing equipmentis available for making profile charts of each flank angle on 10 threads/in.or coarser.Manufacturer’sinstructions describe the process.

A3.8 Major Diameter Measurement

Threaded segments with55 deg. maximum included angles and slightly truncated at the crests are used with an internal indicating gage. The segments are set to aplainring gage or to the inner sides of parallel jaws attached toa gage blockcombination equivalent to the basic major diameter of the ring gage. Thethread ring gage is explored for maximum and minimum diameter,

A 4 . 1 . 2 The X or Y tolerance plug gage is measured between flat parallel anvils of a measuring machine which has a resolution to 0.00001 in. or less, with a measuring forceof 1 lb. Theflatness and parallelism of the anvils should be within 0,00001 in. The calibration history of themeasuring screw shouldnot exceed 0.00003 in. The measuring machineanvils are set with a toleranceGrade 3 gageblockcombination which corresponds to themarked diameter of the pluggage. Measurements are made around plug the nearthe ends and middle to determine that ovality, out-of-roundness, barrelshape,andtaperarewithintolerance. Also, one measured diameteris marked, and this mark is used asthestarting positionforgenerating a roundness chart ona roundness testing instrument for compliance to tolerance. Roundness is assessed by the minimum circumscribed circle method on the chart. The out-of-roundness is the radial separationbetween the minimum circumscribed circle and the maximum inscribed circle. Refer to ANSIB89.3. I, Measurement of Out-of-Roundness, for details on roundness measurement.

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ASME 81.2 83

2575512 0033828 0

A 7 ROLLS WITH ZERO LEAD THREAD FORM USED ON SNAP AND INDICATING GAGES

A5 PLAIN RING GAGE CALIBRATION

GO and NOT GO Plain Ring Gages, Z Tolerance GO and NOT GO Plain Setting Ring Gages, X Tolerance

Rolls may be checked for thread form and size by optical projection (see A2.5 and A2.6). Pitch is measuredasdescribedin A2.2. New rollsshould be manufactured to X tolerances. Worn rolls should be replaced when a single thread elementwears outside of X tolerance.

A5.1 DiameterMeasurement

A8.1 Inspection of the Threaded Section Used on External Product Threads A8.1 .I Straightness (Taper,Bellmouth, and Barrel Shape) (a) Using the last three threads of the full-form portion of the truncated type setting plug (handle end on taperlockblanks), engage thefirst threethreads on one end of the segments. Note the reading, (b) Using the same procedure, engage thelast three threads on the other end of the segments. Note the reading. (C) Repeat step (a) usingfirst three threads of the truncated portionof the plug (opposite the handle end on taperlock blanks). Note the reading. (d) Repeat step (b) using the first three threads of the truncated portion of the plug. Note the reading. Indicated differences exceeding X tolerance forpitch diameter between reading (a) and (b) or ( C ) and (d) reveal the segments-as havingan end-to-end straightness deviation,

A5.1.2 The X tolerance ringgage is measured over two radius contacts on an internal measuring instrument. Internal measuring procedureis given in ANSI B89.1.6, Measurement of Qualified PlainInternal Diameters for Use as 'Master Rings and Ring Gages. The measuring device is set with a master gap produced by clampingflatparalleljawsonthegageblock combination correspondingto the ringgage dimension. The gage blocks and the jaws which are accessories to gage block sets must meet the requirementsspecified in ANSI B89.1.9, Precision Inch Gage Blocks for Length Measurement (Thru 20 Inches). The small displacement between ring gage diameter and master gap is read on the meter. Measurements are taken around the gage, near the ends, and in the middle. The measuring instrument should have a readout of at least 0.00001 in. A referenced position at themiddle of the boreis used to index the out-of-roundness check as described in A4.1.2.

NOTE: Moredefinitive analysisforbellmouth or barrelshapecan be plug (full-form or truncated) havinga made by usingacheck maximum lengthof three pitches, rotating the plug through the full length of the segments, and noting the plus and minus (-f) indicator variation at specific points in the segments.

A 6 PLAIN SNAP GAGES

A8.1.2 Flank Angle Wear (a) Indicated differences exceeding X tolerance for pitch diameter values obtained by A8.1.1 procedure (a) and (C), or (b) and (d), reveal that the segments have excessive flank angle wear; or (b) Indicated differences exceeding X tolerance for pitch diameter values obtainedbetween the full-form portion and the truncated portionof the setting plug when engagingthe segments over their full length also reveal that the segments have excessive flank angle wear.

GO and NOT GO plain snap gages for external major diameter check are set with plain Z tolerance plug gages. When the adjustableanvil is locked, there should be a very light drag felt when plug gage or roll is pushed between anvils for its entire travel.If this does not occur, anvils are worn out of parallel and shouldbe relapped. The snap may be set with gage blocks and roll whose combined thickness equals the major diameter limit. When the adjustable anvil is locked, the small roll should havea very light drag when moved across the anvil. 168 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

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A5.1.1 The Z tolerance ring gageis measured with internal indicatinggage or measuring instrumentwhich has a resolutionof 0.00004 in. Themeasuring device is usually set with a master gap produced by clamping jaws to the selected gage block combination. MeasureA8 INSPECTING PERIPHERAL CONTACTING ments are taken around the bore near ends and in the SEGMENTS USED ON EXTERNAL middle. PRODUCT THREAD

TABLE A4 LENGTHS OF AGD THREAD RING GAGEBLANKS AND TOTAL THREAD LENGTHS STANDARD TRUNCATED-SETTING PLUG GAGE BLANKS SELECTED FROM ANSI B47.1 Thread Sizes, Decimal Range

Total Thread lengths of Truncated Thread-Setting Plugs

lengths of Thread Ril ;Gages

Above

To And Including

Thin Ring

Thick Ring

Fine-Pitch Instrument Ring

1

2

3

4

5

0.059 0.090 0.150 0.230 0.365

0.090 0.150 0.230 0.365 0.510

5/32 3/16 l/32 7/1 6

... ... ...

... ...

0.510 0.825 1.135 1.510 2.010

0.825 1.135 1.510 2.010 2.510

2.510

3.010 3.510 4.010 6.260

3.510

4.010

3/32

3/4 15/16

9/16

.For Fine-Pitch

ForThin Ring

6 7/32 3/8 13/32

5/16

1

15/32 17/32

11/4

1 '/8

5h

1'/4

5/8

17/8

7/8

15/16

11/16

2

7/8

I318

...

1718

15/16

17116 1V2

...

2 2 2%

1'

1v2 ~~

...

...

I

3/4

3/4 73/16

15/16 ~~

' / 4

:

11/2 1 5/8

l/16

3.010

... ...

OF

...

I

. r .

... 9/16

...

"/1 6

1 1% 1 5/16 15/16 17/16 3 3% 3'/4 31/4

...

... ... ...

~~

GENERAL NOTES: (a) Thin gage blanks are used for all NOT G O (LO) thread ring gages. Counterbore sides as applicable. (b) For G O thread ring gages: (1) 0.059in. to 0.510 in., use thin blank for all pitches, recessing sides where applicable; (2) above 0.510 in, to 1.135 in., use thick blank for pitches coarser than 12 TPI, thin blank for pitches 12 TPI to 28 TPI, and fine-pitch instrument blank for pitches 30 TPI and finer; (3) above 1.135 in. to 6.260 in., inclusive, use thick blank for pitches coarser than 10 TPI, thin blank for pitches10 TPI to 28 TPI, and fine-pitch instrument blank for pitches 30 TPI and finer.

A8.1.3 Lead Error. Shouldthe precedingcheckspitchdiameter between thefirstand secondreadings forstraightnessandflankanglewearfallwithin X reveals that the segmentshave a lead error. tolerance, the check for lead error is performed as A8.1.4Thread Form and Cylindrical Form Confollows: tinuity. For checking continuityof threaded and plain (a) Using the last three threads of the full-form surfaces (helical profile uniformity, continuous thread portion of the setting plug (handle end on taperlock blanks), engage thefirst three threads on one end of the flank contact with setting plug, and cylindrical consegments. Note the reading. tacts), the conventional bluing procedure is used. (b) With the three threadengagement above, rotate the full-form portion of the plugthrough.ihesegments A8.1.5 Minor Cylinder to Pitch Cylinder Reto full length engagement. Note the reading. lationship of Each Segment Anindicateddifferenceexceeding X tolerance for (a) With each like codedsegment,measure from its pitchdiameter between the firstandsecondreadings moynting holeover theoutsidediameier of a plain above reveals that the segments have excessive lead plug whose diameter is that of the specified maximum and diameter minorerror. which minor is the resting on (C) Repeat steps (a) and (b) with thetruncated diameter of the segment. Note the two readings. portion of the plug. Note thereading. (b) With each like coded segment, measure from its An indicated difference exceeding X tolerance for mounting hole over the outside diameter of the W r --`,,`,,``,,`,,,`,,`,,,,```,`,,-`-`,,`,,`,`,,`---

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point. With the bottomsegment still lockedas in step (a), lockthe topsegment on the stud with the set screw provided in the back of the segment to prevent itfrom pivoting. Lift the pivot arm and back out the plug.

tolerance GO thread plug- full-form section - as it rests in the segment thread. Note thereadings. The differences between matching sets of readings from steps (a)and (b) for eachsegment must be within the X tolerance for minor diameter.

N O T E T h e pivot arm will not lift highenoughtoallowtotal disengagement. Consequently, the plug must be screwed out.

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NOTE: Inspection fixtures can be used for the above.

(e) Repeat step (b) above. (f)The indicated difference between steps (d) and (e) above should not exceed X tolerance for minor diameter.

A8.1.6 MinorCylinder Size Comparedto Pitch Cylinder DiameterSize and MinorDiameter Straightness (As aCoded Pair) (U) Using the full-form portion of the W tolerancesetting plug, engage its entire length into thesegments and zero-out the indicator. (b) Using a plain cylindricalplug having asize equal tothemaximum-materialminordiameter of the thread size in question, engage that plug fullyinto the segments and note the reading. The difference in readingmust be within the X tolerance specified for minor diameter. (C) To verify thetaper of the minordiameter, partially engage the plain cylindrical plug from each end of the segments. (d) Measure directly for straightness from thesegment mounting hole directly to the minor diameter flats of each thread in the segment.

A9 INSPECTION OF THREAD CONTACT SEGMENTS USED ON INTERNAL PRODUCT THREAD

The coded pairs of segments are locked or clamped when engaging the plain ring gage or thread-setting ring. Thenthreadform, pitchdiameter,major diameter, pitch, and straightness can be inspected by methods described in A2.1 through A2.8.

A 1 0 CHECK FOR MAGNIFICATION DISCREPANCIES DUE TO INDICATING SYSTEM LINKAGE

A8.1.7 Minor Cylinder to Pitc.h Cylinder Coaxiality Relationship (As a Coded Pair)

Two X tolerance plain plug gages for the external thread indicatinggages and twoX tolerance plain ring gages for the internal thread indicator gages, whose diameterdifferencecorrespondswiththeworking range of the indicator dial, are required. When they are applied to thecluster of rolls or segments, the difference in indicator dialreadings should not deviate by more than k1 leastgraduationfromthecalibrated difference between the two gages.

NOTE: Even though the size of the minor diameter may be within tolerances, they may not be coaxial. (U) Using the full-form portion of the W tolerancesetting plug, engage the entire lengthinto thesegments and zero-out the indicator at the high point. Lock the segments on the studs,with the set screws provided in thebacks of the segments to prevent themfrom pivoting. Lift the pivot arm and back out the plug.

NOTE:Thepivotarm will not lift highenoughtoallowtotal disengagement. Consequently, the plug must be screwed out.

A I 1 CALIBRATION OF DIAL AND ELECTRONIC INDICATORS

(b) Using the plain cylindrical plug having a size equal to the maximum-material minor diameter of the thread size in question, engage the plug by sliding it in (right to left or left to right) from the end. Note the reading. (C) The indicated difference between steps (a) and (b) above should not exceed X tolerance for minor diameter. (d) Loosen and reverse the top segment 180 deg. (ledge sideout) andusing the full-form portion of the W tolerance-setting plug, engagethe entirelength into the segments and zero-out the indicator at the high

Calibration of the indicatormay be done by displacing the spindle with a calibrated micrometer screw or with tolerance Grade3 gage blocks inserted between a fixedanvil andthe spindle. The. accuracy of the micrometer screw should be 0.00003 in. and is used for calibrating indicators with resolution of 0.00008 in. and larger. The zero setting for calibrating dial indicators is at the12 o’clock position, A minimum of four equally spaced incrementsper revolution is calibrated. On electronic indicators each numbered division is calibrated. 170

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ASME B 3 . 2

83

2575532 0033B33 0

A12 ASSESSMENT OF SURFACE QUALITY

Product threadswhich exhibit torn or rough surface maybe assessed withindicating gages. The rapid fluctuation of the indicating needle when the part is rotated slowly between the gage contacts may not exceed 0.0001 in. For external threads, a roll type indicating gage with “best size” thread radius rolls is used. For internal threads, a gage with “best size” thread ball contacts is used.

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ASME B I - 2 83

2575532 0033832

2

APPENDIX B METROLOGY OF 60 deg. SCREW THREADS (This Appendixis not partof American National StandardGages and Gaging for Unified Inch ScrewThreads, A N W A S M E B1.2-1983, and is included for information purposesonly.)

measure all threads of a given pitch and included angle. The “best size” thread wire is taken as that size which will touch at the groove diameter of a groove cut around a cylinder perpendicular to the axis of the cylinder. The size of the “best size” thread wire, resting in a zero lead angle 60 deg. vee thread, is given by the formula:

B I WIRE METHOD OF MEASUREMENT OF PITCH DIAMETER (THREAD GROOVE DIAMETER)

This Section presents specifications and techniques for the measurement of screw thread plug gages and setting plugs by measuring over accurate cylinders or wires inserted in the threadgrooves. The purposeis to make available a standard United States method for making such measurements, The practices described measuregroovediameter, which is equal to pitch diameter only on a thread with perfect pitch spacing.

w = 0 . 5 ~X sec

(1)

where W = diameter

of wire p = pitch (Y = half-angle of thread Reduce this formula to

62 SIZE OF WIRES

In the three-wire method of measuring pitch diameter, hardenedsteel cylinders or wires of appropriate size are placed in the thread groove, twoo n one sideof the screw and one on theopposite side, as shownin Fig. B1. The contact face of the comparator, measuring machine, o r micrometer anvilor spindle which is over the twowires must be sufficiently large in diameteror width to touch both wires; that is, it must be greater than thepitch of the thread. It is best to select-wires of such a size that they touch the sides of the thread at points where thegroove is equalto 0 . 5 ~(groove diameter). This is done so that the measurement of pitch diameter is least affected by any error in thread angle. The size of wire which touches exactly at the groove diameterof a perfect thread of a given pitch is termed the “best size” thread wire for that pitch, The deptha t which a wire of given diameter will rest in a thread groove depends primarily on thepitch and included angle of the thread; and,secondarily, on the angle made by the helix at the pointof contact of the wire and the thread, with a plane perpendicularto the axis of the screw. Variation in the lead angle has very a small effect in the measurement of groove diameter with wires. It i s desirable to use one size of wire to

w = 0.57735 X p

(2)

for 60 deg. threads. On occasion, itmay be necessary when a “best size” thread wire is not available to measure pitch diameter by means of wires of other than the “best size.” The minimum size which may be used is limited to that permitting the wire to project above the crest of the thread, and the maximum, to that permitting the wire to rest on theflanks of the thread just below the crest and notride on thecrest of the thread. The diameters of the best size, maximum, and minimum wires for 60 deg. threads are given in Table BI.

B 3 METHODS OF MEASURING WIRES CONSIDERING THE EFFECT OF DEFORMATION

Measurement of the pitch diameter of a threadgage by means of the three-wire method is most conveniently made when sufficient forceis applied to the wires by the measuring instrument td properly align the wires and gage. Since a wire touches a minute area on each 173

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(Y

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FIG. B I A THREE-WIRE METHOD OF MEASURING PITCH (THREAD GROOVE) DIAMETER OF THREAD PLUG GAGES and the measuring force is made. Optimum compensation for the deformations which occur inthe measurement of pitch diameter would require the calibration of wires with a different cylinder or force for every thread diameter-pitch combination, Calibration of wires involving such a variety of conditions is neither practical nor necessary, as themeasurement procedure which is generally followed will assure uniformity of values. It is desirable to keep the effects of deformation small. (b) It can be shown, for example, that all sizes of threads from 0.138 in. to 1.500 in. can be measured with wires calibratedagainsta 0.750 in.diameter cylinder using the forcesrecommended forpitch diameter measurements in Table B2 with deviations from true pitch diameter (neglecting the effect of lead angle)not in excess of 0.000035 in, Slightlylarger discrepancies inthe 2 in.to 4 in. size range arerelatively unimportant because thesesizes have larger tolerances. For sizes smaller than 0.138 in. it is necessary to calibrate wires against a0.125 in. cylinder which has a radius morenearly equal to the radius of curvature of the thread flank.

thread flank, the deformationof the wire and thread will be sufficientlylarge to requiresometype of correction and the measuring force must be limited to avoid permanent deformation of the wire and gage. As an indication of the need for compensation for the deformations, it can be shown that the totaleffect on pitch diameterof the deformationsof three wires and a 1/2-20 threadgage is 0.00019 in. when measured under 2.5 lbforce.It is practical to compensate for the major portion of this deformation by a simple procedure described in the following paragraphs. (a) It would be possible to prepare tables of the deformation of all standardizedsizes ofgages, but this would not take care of special combinations of pitch and diameter. Another method of compensating for the deformations is to measure the threadwires under conditions which provide deformations equivalent to those which occur whenthe wires are used to measure a thread. This canbe accomplished by the measurement of the thread wires between a flat anvil and a cylinder with the axes of cylinder and wire at 90 deg. to each other if an appropriate selection of cylinder diameter 174 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS

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N

-

ASME B 3 9823

TABLE BI Pitch, 1 Threaddin., n

P=;

2595512 0033834 b

=

1-.-

THREAD-MEASURING WIRES FOR 60 deg. SCREW THREADS Wire Sizes, W Best’

0.577350~

Maximum’

1.010363p 0.866025~

C, Minimum’

“Best Size” Thread Wire Constant:

0.505182~

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in. 0.012500 .013889 ,015625 .017857 .020000

in.

in.

in.

in.

80 72 64 56 50

0.00722 ,00802 .00902 .01031 .Oll55

0.01263 ,01403 ,01579 .01804 .02021

0.00631 ,00702 .00789 .00902 .01010

0.010825 .012028 ,013532 .015465 ,017321

48 44 40 36 32

.020833 ,022727 ,025000 ,027778 .031250

.01203 ,01312 .01443 .01604 .01804

.02105 .02296 .02526 .02807 .03157

.01052 ,01148 .01263 .01403 .OE79

.018042 .019682 .021651 ,024056 .027063

30 28 27 26 24

.033333 ,035714 .037037 .038462 .041667

-01924 .02062 .02138 .02221 .02406

.03368 .03608 ,03742 .03886 .04210

.01684 .01804 .01871 .01943 .02105

.028868 .030929 .032075 ,033309 ,036084

22 20 18 16 14

.045455 .050000 ,055556 ,062500 .071429

.02624 .02887 .03208 .03608 .04124

.04592 .05052 .05613 .Of3315 .07217

,02296 .02526 .02807 ,03157 .03608

,039365 ,043301 .048113 .054127 .061859

13 12 11V 2 11 10

.076923 .083333 .086957 .090909 .100000

.04441 ,04811 .05020 .05249 .05774

.07772 .Of3420 .08786 .09185 .I 0104

.03886 .04210 .04393 .04593 .05052

.066617 .072169 ,075307 .078730 .086603

9 7l/2 7 6

.111111 .I25000 ,133333 .I42857 .I66667

.Of5415 ,07217 .07698 .08248 ,09623

.I1226 ,12630 .I3472 .I4434 .I6839

.05613 .Of5315 .06736 .07217 .08420

,096225 .IO8253 ,115470 .I23718 .I44338

5’h 5 4’/2 4

.I81818 .200000 ,222222 .250000

,10497 .I1547 .I2830 .I4434

.I8370 ,20207 .22453 .25259

,09185 .IO104 .I1226 .I2630

.I57459 ,173205 .I92450 ,216506

8

NOTES: (1) The diameters of “best size” thread balls are the same as the diameters of “best size” thread wires.

+

(2) Measured PD = M,“ 0.886025p - 3W (3) If “best size” thread wire is used, PD = M - C . t

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TABLE B2 MEASURING FORCE FOR OVER-WIRE MEASUREMENTS OF EXTERNAL P I T C H D I A M E T E R A N D WIRE CALIBRATION, AND CYLINDRICAL DIAMETER .FOR WIRE CALIBRATION Threads/in. Measuring

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20 o r less Over 20 but not over 40 Over 40 but not over 80 Over 80 but not over 140 Over 140

Force (210%) 2.5 Ib 1 Ib

8 oz 4 oz 2 oz -

(C) As previously noted, the force applied by the measuring device must be limitedto avoid permanent deformation of the wires or gage, or both. Even for largediameterthreads havingcoarse pitches, the maximum compressive stress at thepoints where a wire touches the thread flanksis high, and itincreases to a point where permanent deformationmay occur forthe small diameter threads. It therefore becomes necessary to reduce the measuring force prcgressively as thesizes of threads decrease. See Table B2.

B 4 METHODS OF MEASUREMENT USING WIRES

The computed value for the pitch diameter of a screw thread gage obtained from readings over wires will depend uponthe accuracy of themeasuring instrument used, the measuring force, and the value of the diameter of the wires used in the computations. In order to measure the pitch diameter of a screw thread gage to an accuracy of 0.0001 in., strict adherence to the methods specified is required. (a) The “best size” thread wires shall comply with the specifications listed in B2. The diameter of the wires must be known to within 0.000020 in. (b) The measurement over wires should be made with a measuring instrument which reads directly to 0.000010 in.and hasflatparallelcontactswithin 0.000004 in. (C) A wire presses on the flanks of a 60 deg. thread with theforcethat is applied tothe wire by the measuringinstrument.Inasmuchasthe wire and thread deform at the contact areas, it is desirable to determine thesize of the wire under conditions which will compensatefor thisdeformation. It is recommended for standard practice that diameters of wires be measured between a flat contact and a hardened and accurately ground and lappedsteel cylinder having a diameter in accordance with Table B1 with the measuring force specified in Table B2. The plane of the flat

Cylinder Diameter, in. 0.750 0.750 0.125 0.050 0,020

contact should be parallel to the contact element of the cylinder within 0.000004 in. T o avoid a permanent deformationof the material of the wire or gages, it is necessary to limit the contact force and, forconsistent results, a uniform practiceas to contactforceinmaking wire measurements of hardened screw threads gages is necessary. The recommended force for external pitch diameter measurements is given in Table B2. The use of other contact forces will cause adifference inthereadingoverthe wires, andto completely compensate for such errorsis impractical. Variations in diameter around thewire should be determined by rotating thewire between a sphericalor flat measuring contact and ananvil having the form of a 60 deg. vee groove. Variations in diameter along thewire should be determinedby measuring between a sphericalor flat contact and a cylindrical anvil. (C) The wires should be free to assume their positions in the threadgrooves without restraint. (The practice of holding wires in position with elastic bands can introduce errors in measurement.) (d) To assure accurate values for pitch diameter measurement, the measured value should be given to five decimal places. (e) Measurements shall be standard at 6 8 O F.

B5 STANDARD SPECIFICATION FOR WIRES ‘AND STANDARD PRACTICE IN MEASUREMENT OF WIRES.. OF 60 deg. THREADS

The following specifications represent present practice relative to thread-measuring wires. (a) Composition. The wires shall be accurately finished steel cylinders, the hardnesssfwhich shall not be less than that corresponding to a Knoop indentation number of 776 minimum. The surface.textureshall not exceed the equivalent of 2 pin. aa (arithmetic average).

176

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(6) Length of Wires. The working surfaceshall beat least 1.OOO in. in length. The wire may be provided with a suitable means of suspension. (C) Diameter of Wires. One setof wires shall consist of three wires which shall have the same diameter within 0.00001 in., and this common diametershall be within 0.00002 in. of that corresponding to the “best size” for the pitch for which the wires are tobe used. Wires shall be measured between a flat contact and a hardened and accurately finished cylinder having a surface texture not over 2 pin. aa. The measuring forces and cylinder diameter shall be per Table B2. (d) Variation in Diameter. Variations in diameter along a wire (taper) over the 1.000 in, interval a t the center of its length shall not exceed 0.00001 in. as determined by measuring between a spherical or flat contact and a cylindrical contact. Variations from true cylindrical contour of a wire (out-of-roundness, or n o n c i p l a r cross section) over its 1.OOO in. central interval shall exceed not 0.00001 in. as determinedby measuring between a sphericalor flat measuringcontactanda well-finished 60 deg. vee groove. For the 80 pitch wire, the spherical contact is attached to the tip of a 55 deg. or less cone, or the flat contact is formed by truncating a 55 deg. or less cone point to an approximate0.010 in. width. (e) Container and Marking. A suitable container shall be provided for each set of wires. The pitch for which the wires are the “bestsize” and the diameterof the 1.000 in. central interval of the wires, as determined by measurements under standard conditions asspecified, shall be marked on the container.The measuring forceand C correctionsshallbemarkedinthe container.

where d2 = pitch diameter M , = measurement over wires a = half-angle of thread p = pitch lead tan A‘ = = leadangle(angle between axis of 3.1416d2 wire andplaneperpendicular to axis of thread)

W = mean diameter of wires Thisformula is a very close approximation,being based on certain assumptions regarding the positions of the points of contact between the wire and the thread. Formula (3) canbe converted tothe following simplified form, which is particularly useful when measuring threads of large lead angle: dz = Mw

+ ( Tcot) @a)

- W(l

+ cosec a‘)

(4)

in which a’ = the anglewhose tangent equals tan a cos A‘. When fbrmula (3) is used, the usual practice is to expand the square root terma series, as retaining only the first and second terms, which gives the following:

+ tan2 A cos2

(Y

cot a

B 7 SIMPLIFIED FORMULA FOR PITCH DIAMETER

In the measurement of pitch diameter, the term

B 6 GENERAL FORMULA FOR MEASUREMENT OF PITCH DIAMETER

w tan2 V cosa cotcr

The general formulafordeterminingthe pitch diameter of any thread whose sides are symmetrical with respect to a line drawn through the vertex and perpendicular to the axis of the thread in which the slight effect of lead angle is taken into account is:

(”-4

is neglected, as its valueis small, being in allcases less than 0.00015 in. for standard single lead fastening screws when the“best size” thread wireis used. Formula ( 5 ) takes the simplified form: d2 = M,

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(3)

+ (+cot a

- W(l

+ cosec a)

(6)

The practice of using formula (6) for such threads is

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permissible inorder to maintain uniformity of practice in the United States and thus avoid confusion. For a 60 deg. thread of correct angle and thread form, formula (6) simplifies to d2 = M ,

+ 0.866025~= 3 W

(7)

For a given set of “best size” thread wires d2=Mw-C

where

C = W [1

+ cosec

(b) Wring the gage blocks to both anvils at maximum measuring force setting,or press with fingers the tailstock spindle against the gage blocks while wringing them to the anvils, (C) With the gage blocks stillin theinstrument, reduce the measuring force to that which will be used and reset the instrument at this working measuring force.Thisprocedureprovides adequate force for wringing gage blocks in with relatively large areas of anvil faces.The finalsetting at the working measuring force to be usedcompensatesforanyinstrument deflectionvariation that may occur atthe higher measuring forces.

- (,)(p)] cot (Y

B9 THREAD BALLS

The quantityC is a constant fora given thread angle and, when the wires are used for measuring threadsof the pitch and angle for which they are the“best size,” the pitch diameteris obtained by the simple operation of subtracting this constant from the measurement taken over the wires. In fact, when “best size” thread wires are used, this constant is changed very little by a moderate variation or error in the angle of the thread. Consequently, the constants for the various sets of wires in use may be tabulated, thus saving a considerable amount of time in the inspection of gages. However, when wires of other than the best size are used, this constantchanges appreciably with a variation in the angle of the thread. With the exceptionof large pitchscrews, it hasbeen shown that variation angle in from thebasic size causes no appreciable change in the quantity C for the “best size” thread wires. (For angle variation of 2 deg., C increases by 0.00004in. for 16 threads/in., and0.00008 in. for 8 threads/in.) On the other hand, when a wire near the maximum or minimum allowable size is used, a considerable change occurs, and the values of the cotangent and the cosecant of the actual measured half-angle are to be used. It is apparent, therefore, that there is a great advantage in using wires very closely approximating thebest size. For convenience in carrying out computations, the value Cfor pitches as shown in Table B1 should be used.

B8 SETTING MEASURING INSTRUMENTS WITH VARIABLE MEASURING FORCE

Recommended practicefor setting measuring instruments using gage blocks is as follows. (a) Wipe anvils and gage blocks free from dirt and dust.

B9.1 “Best Size“ Thread Balls Specifications

Thread balls shall meet the following requirements: (a) for a 60 deg. thread, the “best size” thread ball

sizes are identical to the “best size” thread wire sizes and are given in Table BI; (b) one set of “best size” thread balls consists of three hardened steelballs that have the same diameter within 0.00001 in., and their common diameter should be within 0.00002 in. of the corresponding“best size” thread ball forthe specified pitch. The sphericity should not exceed 0.00001 in, B9.2 Method of Measuring Thread Balls

The following procedures shallbe used when measuring pitch diameter threadballs, (a) In order to measure the pitch diameterof a 60 deg. thread ring gage to an accuracy of within 0.0001 in. by means of thread balls,it is necessary to know the thread ball diameters to within 0.00002 in. Thus, it is necessary to use a measuring instrument that reads accurately to 0.000010 in. (b) The threadball presses on the flanks-of a 60 deg. thread with the force thatis applied to the threadball by the measuring instrument. Since the thread ball and thread deform at the contact areas, the size of the thread ball should be determined under conditions which nearly compensate for this deformation. The thread ball should be measured between parallel, flat, hardened steel contacts which are set with calibrated gageblocks. The contact should be parallelwithin 0.000004 in. (C) To avoid exceedingthe elastic limitof the thread balls and thread gages and to prevent excessive deformation compensation,it is necessary to recommend a uniform practice for measuring force for the cahbra-

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ASME B 1 - 2 83

2595512 0013838 3

TABLE B3 MEASURING FORCE OVER BALLS FOR INTERNAL PITCH DIAMETER MEASUREMENT A N D BALL CALIBRATION Threads/in. Range Measuring

Ib

32-20 0.375 0.500

20-8

8 and coarser

tion of thread balls and for their use in measuring internal pitch diameter. Table B3 gives the recommended measuring forces. (d) Variations in diameter around the thread ball should be determined by rotatingthethread ball between parallel measuring contacts.

B1 0 INTERNAL PITCH DIAMETER MEASUREMENT

Indicating gages with “bestsize” thread ball contacts are set to either a calibrated plain ringgage or a gage block gapwhich is larger than thebasic pitch diameter of the product thread by one-half of the diameterof the “best size” thread ball. The measured internal pitch diameter is obtained by adding the indicator reading change directlyto thebasic pitch diametersize. Setting to a plain ring gage permits less uncertainty indeformation compensation. The recommended measuring force over thread balls €orinternal pitch diameter measurement is given in Table B3.

I

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0.250

Force (*IO%),