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DIN 931

DIN 931 Hex Bolt Dimensions

Size Width Across Flat (s) Head Height (k) Thread Length
DIN 931 ISO 4014 DIN 931 ISO 4014 DIN 931 Length (in MM) ISO 4014 Length (in MM)
Min Max Min Max Min Max Min Max ≥125 >125≥200 ≥200 ≥125 >125≥200 ≥200
M2 3.82 4.00 3.82 4.00 1.28 1.52 1.275 1.525 10 – 10 –
M3 5.32 5.50 5.32 5.50 1.88 2.12 1.875 2.125 12 – 12 –
M4 6.78 7.00 6.78 7.00 2.68 2.92 2.675 2.925 14 – 14 –
M5 7.78 8.00 7.78 8.00 3.35 3.65 3.35 3.65 16 – 16 –
M6 9.78 10.00 9.78 10.00 3.85 4.15 3.85 4.15 18 – 18 –
M8 12.73 13.00 12.73 13.00 5.15 5.45 5.15 5.45 22 41 22 –
M10 16.73 17.00 15.73 16.00 6.22 6.58 6.22 6.58 26 45 26 –
M12 18.67 19.00 17.73 18.00 7.32 7.68 7.32 7.68 30 49 30 –
M14 21.67 22.00 20.67 21.00 8.62 8.98 8.62 8.98 34 53 34 –
M16 23.67 24.00 23.67 24.00 9.82 10.2 9.82 10.18 38 57 38 –
M18 26.67 27.00 26.67 27.00 11.28 11.7 11.285 11.715 42 61 42 –
M20 29.67 30.00 29.67 30.00 12.28 12.7 12.285 12.715 46 65 46 –
M22 31.61 32.00 33.38 34.00 13.78 14.2 13.785 14.215 50 69 50 69
M24 35.38 36.00 35.38 36.00 14.78 15.2 14.785 15.215 54 73 54 73
M27 40.00 41.00 40.00 41.00 16.65 17.4 16.65 17.35 60 79 60 79
M30 45.00 46.00 45.00 46.00 18.28 19.1 18.28 19.12 66 85 66 85
M33 49.00 50.00 49.00 50.00 20.58 21.4 20.58 21.42 72 91 – 91
M36 53.80 55.00 53.80 55.00 22.08 22.9 22.08 22.92 78 97 – 97
M39 58.80 60.00 58.80 60.00 24.58 25.4 24.58 25.42 84 103 – 103
M42 63.10 65.00 63.10 65.00 25.58 26.4 25.58 26.42 90 109 – 109
M45 68.10 70.00 68.10 70.00 27.58 28.4 27.58 28.42 96 115 – 115
M48 73.10 75.00 73.10 75.00 29.58 30.4 29.58 30.42 102 121 – 121
M52 78.10 80.00 78.10 80.00 32.5 33.5 32.5 33.5 – 129 – 129
M56 82.80 85.00 82.80 85.00 34.5 35.5 34.5 35.5 – 137 – 137
M60 87.80 90.00 87.80 90.00 37.5 38.5 37.5 38.5 – 145 – 145
M64 92.80 95.00 92.80 95.00 39.5 40.5 39.5 40.5 – 153 – 153
M72 102.80 105.00 — — 44.5 45.5 — — – 169 – –