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PART THREAD HEXAGON HEAD SCREWS # 931 - DIN & ISO DIMENSIONS k

Ref: DIN 931 - Part 1 & 2 1987 Standard Part 1 contains specifications for hexagon head bolts with metric screw thread from M 1.6 to M 39 with the product grade A for sizes up to M 24 and product grade B for sizes above M 24. Standard part 2 contains specifications for hexagon head bolt with metric screw thread from M 42 to M 160 in product grade B. Because ISO standard covers only sizes up to M 36, the DIN standard was subdivided into Part 1 (M 1.6 to M 36) and Part 2 (M 42 to M 160).

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Dimensions in mm. NOM. THREAD DIAMETER (d) THREAD PITCH (coarse) 125 mm & shorter Thread length (b) for Nom. 125 - 200 mm length (l) 200 mm & longer min. washer face max. max. ds min. A Product e min. Grade B Nom. Dimensions min. k max. Max. = Nom. Dimensions s min.

M3 0.5 12 0.15 0.4 3 2.86 6.01 2 1.88 2.12 5.5 5.32

M4 0.7 14 0.15 0.4 4 3.82 7.66 2.8 2.68 2.92 7 6.78

M5 0.8 16 22 0.15 0.5 5 4.82 8.79 8.63 3.5 3.35 3.65 8 7.78

M6 1 18 24 0.15 0.5 6 5.82 11.05 10.89 4 3.85 4.15 10 9.78

(M 7) 1 20 26 0.15 0.5 7 6.78 12.12 11.94 4.8 4.65 4.95 11 10.73

M8 1.25 22 28 0.15 0.6 8 7.78 14.38 14.20 5.3 5.15 5.45 13 12.73

M 10 1.5 26 32 45 0.15 0.6 10 9.78 18.9 6.4 6.22 6.58 17 16.73

M 12 1.75 30 36 49 0.15 0.6 12 11.73 21.1 7.5 7.32 7.68 19 18.67

(M 14) 2 34 40 53 0.15 0.6 14 13.73 24.49 8.8 8.62 8.98 22 21.67

M 16 2 38 44 57 0.2 0.8 16 15.73 26.75 26.17 10 9.82 10.18 24 23.67

(M 18) 2.5 42 48 61 0.2 0.8 18 17.73 30.14 29.56 11.5 11.28 11.72 27 26.67

M 20 2.5 46 52 65 0.2 0.8 20 19.67 33.53 32.95 12.5 12.28 12.72 30 29.67

(M 22) 2.5 50 56 69 0.2 0.8 22 21.67 35.72 35.03 14 13.78 14.22 32 31.61

M 24 3 54 60 73 0.2 0.8 24 23.67 39.98 39.55 15 14.78 15.22 36 35.38

(M 27) 3 60 66 79 0.2 0.8 27 26.67 45.20 17 16.65 17.35 41 40

M 30 3.5 66 72 85 0.2 0.8 30 29.67 50.85 18.7 18.28 19.12 46 45

(M 33) 3.5 72 78 91 0.2 0.8 33 32.61 55.37 21 20.58 21.42 50 49

M 36 4 78 84 97 0.2 0.8 36 35.61 60.79 22.5 22.08 22.92 55 53.8

(M 39) 4 84 90 103 0.3 1 39 38.61 66.44 25 24.58 25.42 60 58.8

M 42 4.5 90 96 109 0.3 1 42 41.61 72.02 26 25.58 26.42 65 63.8

(M 45) 4.5 96 102 115 0.3 1 45 44.38 76.95 28 27.58 28.42 70 68.1

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Ref: ISO 4014-1979

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This international standard gives specifications partly threaded hexagon head bolts with metric dimensions and thread diameters from 3 mm up to and including 36 mm with product grade A for sizes M 3 to M 24 and with product grade B for sizes M 30 and M 36.

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ds

b s

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Dimensions in mm. NOM. THREAD DIAMETER (d) THREAD PITCH (coarse) 125 mm & shorter Thread length (b) 125 - 200 mm for Nom. length (l) 200 mm & longer min. washer face max. max. ds min. Nom. Dimensions min. Length below 150 mm max. min. Length over 150 k mm max. max. s min.

M3 0.5 12 0.15 0.4 3 2.86 2 1.8 2.12 5.5 5.32

M4 0.7 14 0.15 0.4 4 3.82 2.8 2.68 2.92 7 6.78

M5 0.8 16 0.15 0.5 5 4.82 3.5 3.35 3.65 3.26 3.74 8 7.78

M6 1 18 0.15 0.5 6 5.82 4 3.85 4.15 3.76 4.24 10 9.78

M8 1.25 22 28 0.15 0.6 8 7.78 5.3 5.15 5.45 5.06 5.54 13 12.73

M 10 1.5 26 32 0.15 0.6 10 9.78 6.4 6.22 6.58 6.11 6.69 16 15.73

M 12 1.75 30 36 0.15 0.6 12 11.73 7.5 7.32 7.68 7.21 7.79 18 17.73

(M 14) 2 34 40 0.15 0.6 14 13.73 8.8 8.62 8.98 8.51 9.09 21 20.67

M 16 2 38 44 57 0.2 0.8 16 15.73 10 9.82 10.18 9.71 10.29 24 23.67

M 20 2.5 46 52 65 0.2 0.8 20 19.67 12.5 12.28 12.72 12.15 12.85 30 29.67

M 24 3 54 60 73 0.2 0.8 24 23.67 15 14.78 15.22 14.65 15.35 36 35.38

Comparison Chart on ISO/DIN standards across flat size differences

M 30 3.5 66 72 85 0.2 0.8 30 29.67 18.7 18.28 19.12 46 45

M 36 4 78 84 97 0.2 0.8 36 35.61 22.5 22.08 22.92 55 53.8

Thread Diameter ISO mm DIN mm

M 10 Max. Min. 16 15.73 17 16.73

M 12 Max. Min. 18 17.73 19 18.67

M 14 Max. Min. 21 20.67 22 21.67

*Please note: Diameters shown in () should be avoided for new design.

© Copyright Metric & Multistandard Components Corp. 2000 1-13

M 48 5 102 108 121 0.3 1 48 47.38 82.60 30 29.58 30.42 75 73.1