Dimension of DIN931 hex bolts:
Check the dimension of DIN931 hex bolts from M2-M72: DIN931 specifies the dimensions and properties of hexagon head bolts with half threads. The standard is based on metric measurements, and the dimensions are specified in millimeters. Equivalent standard: ISO4014
Here are the key dimensions typically provided in DIN931:
![](http://www.china-bolts.com/wp-content/uploads/2023/08/din-931-hex-bolts.jpg)
Size | Width Across Flat (s) | Head Height (k) | Thread Length | |||||||||||
DIN 931 | ISO 4014 | DIN 931 | ISO 4014 | DIN 931 | ISO 4014 | |||||||||
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 | 22 | - | 16 | - | - |
M6 | 9.78 | 10.00 | 9.78 | 10.00 | 3.85 | 4.15 | 3.85 | 4.15 | 18 | 24 | - | 18 | - | - |
M8 | 12.73 | 13.00 | 12.73 | 13.00 | 5.15 | 5.45 | 5.15 | 5.45 | 22 | 28 | 41 | 22 | - | - |
M10 | 16.73 | 17.00 | 15.73 | 16.00 | 6.22 | 6.58 | 6.22 | 6.58 | 26 | 32 | 45 | 26 | - | - |
M12 | 18.67 | 19.00 | 17.73 | 18.00 | 7.32 | 7.68 | 7.32 | 7.68 | 30 | 36 | 49 | 30 | - | - |
M14 | 21.67 | 22.00 | 20.67 | 21.00 | 8.62 | 8.98 | 8.62 | 8.98 | 34 | 40 | 53 | 34 | 40 | - |
M16 | 23.67 | 24.00 | 23.67 | 24.00 | 9.82 | 10.2 | 9.82 | 10.18 | 38 | 44 | 57 | 38 | 44 | - |
M18 | 26.67 | 27.00 | 26.67 | 27.00 | 11.28 | 11.7 | 11.285 | 11.715 | 42 | 48 | 61 | 42 | 48 | - |
M20 | 29.67 | 30.00 | 29.67 | 30.00 | 12.28 | 12.7 | 12.285 | 12.715 | 46 | 52 | 65 | 46 | 52 | - |
M22 | 31.61 | 32.00 | 33.38 | 34.00 | 13.78 | 14.2 | 13.785 | 14.215 | 50 | 56 | 69 | 50 | 56 | 69 |
M24 | 35.38 | 36.00 | 35.38 | 36.00 | 14.78 | 15.2 | 14.785 | 15.215 | 54 | 60 | 73 | 54 | 60 | 73 |
M27 | 40.00 | 41.00 | 40.00 | 41.00 | 16.65 | 17.4 | 16.65 | 17.35 | 60 | 66 | 79 | 60 | 66 | 79 |
M30 | 45.00 | 46.00 | 45.00 | 46.00 | 18.28 | 19.1 | 18.28 | 19.12 | 66 | 72 | 85 | 66 | 72 | 85 |
M33 | 49.00 | 50.00 | 49.00 | 50.00 | 20.58 | 21.4 | 20.58 | 21.42 | 72 | 78 | 91 | - | 78 | 91 |
M36 | 53.80 | 55.00 | 53.80 | 55.00 | 22.08 | 22.9 | 22.08 | 22.92 | 78 | 84 | 97 | - | 84 | 97 |
M39 | 58.80 | 60.00 | 58.80 | 60.00 | 24.58 | 25.4 | 24.58 | 25.42 | 84 | 90 | 103 | - | 90 | 103 |
M42 | 63.10 | 65.00 | 63.10 | 65.00 | 25.58 | 26.4 | 25.58 | 26.42 | 90 | 96 | 109 | - | 96 | 109 |
M45 | 68.10 | 70.00 | 68.10 | 70.00 | 27.58 | 28.4 | 27.58 | 28.42 | 96 | 102 | 115 | - | 102 | 115 |
M48 | 73.10 | 75.00 | 73.10 | 75.00 | 29.58 | 30.4 | 29.58 | 30.42 | 102 | 108 | 121 | - | 108 | 121 |
M52 | 78.10 | 80.00 | 78.10 | 80.00 | 32.5 | 33.5 | 32.5 | 33.5 | - | 116 | 129 | - | 116 | 129 |
M56 | 82.80 | 85.00 | 82.80 | 85.00 | 34.5 | 35.5 | 34.5 | 35.5 | - | 124 | 137 | - | - | 137 |
M60 | 87.80 | 90.00 | 87.80 | 90.00 | 37.5 | 38.5 | 37.5 | 38.5 | - | 132 | 145 | - | - | 145 |
M64 | 92.80 | 95.00 | 92.80 | 95.00 | 39.5 | 40.5 | 39.5 | 40.5 | - | 140 | 153 | - | - | 153 |
M72 | 102.80 | 105.00 | -- | -- | 44.5 | 45.5 | -- | -- | - | 156 | 169 | - | - | - |
It’s important to note that the dimensions can vary depending on the specific size and grade of the DIN 931 hex bolt. Additionally, the standard may be updated or revised, so it’s best to refer to the official DIN931 documentation or consult a reliable reference for the most up-to-date dimensions.