Hex Bolt Dimensions
according to DIN 931/ISO 4014
| Size | WAF S |
Head Height K |
Thread Length B |
||||
| Min | Max | Min | Max | ≥ 125 | > 125 ≥ 200 |
≥ 200 | |
| M2 | 3.82 | 4.00 | 1.28 | 1.52 | 10 | - | - |
| M3 | 5.32 | 5.50 | 1.88 | 2.12 | 12 | - | - |
| M4 | 6.78 | 7.00 | 2.68 | 2.92 | 14 | - | - |
| M5 | 7.78 | 8.00 | 3.35 | 3.65 | 16 | 22 | - |
| M6 | 9.78 | 10.00 | 3.85 | 4.15 | 18 | 24 | - |
| M8 | 12.73 | 13.00 | 5.15 | 5.45 | 22 | 28 | 41 |
| M10 | 16.73 | 17.00 | 6.22 | 6.58 | 26 | 32 | 45 |
| M12 | 18.67 | 19.00 | 7.32 | 7.68 | 30 | 36 | 49 |
| M14 | 21.67 | 22.00 | 8.62 | 8.98 | 34 | 40 | 53 |
| M16 | 23.67 | 24.00 | 9.82 | 10.2 | 38 | 44 | 57 |
| M18 | 26.67 | 27.00 | 11.28 | 11.7 | 42 | 48 | 61 |
| M20 | 29.67 | 30.00 | 12.28 | 12.7 | 46 | 52 | 65 |
| M22 | 31.61 | 32.00 | 13.78 | 14.2 | 50 | 56 | 69 |
| M24 | 35.38 | 36.00 | 14.78 | 15.2 | 54 | 60 | 73 |
| M27 | 40.00 | 41.00 | 16.65 | 17.4 | 60 | 66 | 79 |
| M30 | 45.00 | 46.00 | 18.28 | 19.12 | 66 | 72 | 85 |
| M33 | 49.00 | 50.00 | 20.58 | 21.42 | 72 | 78 | 91 |
| M36 | 53.80 | 55.00 | 22.08 | 22.92 | 78 | 84 | 97 |
| M39 | 58.80 | 60.00 | 24.58 | 25.42 | 84 | 90 | 103 |
| M42 | 63.10 | 65.00 | 25.58 | 26.42 | 90 | 96 | 109 |
| M45 | 68.10 | 70.00 | 27.58 | 28.42 | 96 | 102 | 115 |
| M48 | 73.10 | 75.00 | 29.58 | 30.42 | 102 | 108 | 121 |
| M52 | 78.10 | 80.00 | 32.5 | 33.5 | - | 116 | 129 |
| M56 | 82.80 | 85.00 | 34.5 | 35.5 | - | 124 | 137 |
| M60 | 87.80 | 90.00 | 37.5 | 38.5 | - | 132 | 145 |
| M64 | 92.80 | 95.00 | 39.5 | 40.5 | - | 140 | 153 |
Notes..
- All dimensions are given in millimeters
- WAF = Width Across Flat
DIN 933/ISO 4017 Hex Bolts
Explanation of DIN and ISO bolts
- DIN 931 and ISO 4014 is a partial thread hex head cap screw with coarse thread pitch
- DIN 933 and ISO 4017 is a full thread hex head cap screw with coarse thread pitch
- DIN 931/933 and ISO 4014/4017 standards are the exact same with the exception of M10, M12, M14 and M22
- M10 (16 mm), M12 (18 mm), and M14 (21 mm) the WAF is slightly smaller for the ISO standard, whereas for M22 (34 mm) ISO standard the WAF is slightly larger
- ISO 4017 has larger nominal sizes available per standard than DIN 933. DIN 933 technically ranges from M1.6 to M52, whereas ISO 4017 ranges from M1.6 to M64
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