| HEX CAP SCREWS ANSI B18.2.3.1M 1979 |
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All Dimensions in Millimeters | |
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| Basic Bolt Dia. |
Width Across Flats | Width Across Corners | Head Height | Wrenching Height |
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| Max. | Min. | Max. | Min. | Max. | Min. | Min. | |
| M5-0.8 | 8.00 | 7.78 | 9.24 | 8.79 | 3.65 | 3.35 | 2.4 |
| M6-1.0 | 10.00 | 9.78 | 11.55 | 11.05 | 4.15 | 3.65 | 2.8 |
| M8-1.25 | 13.00 | 12.73 | 15.01 | 14.38 | 5.50 | 5.10 | 3.7 |
| M10-1.5 | 16.00 | 15.73 | 18.48 | 17.77 | 6.63 | 6.17 | 4.5 |
| M12-1.75 | 18.00 | 17.73 | 20.78 | 20.03 | 7.76 | 7.24 | 5.2 |
| M14-2.0 | 21.00 | 20.67 | 24.25 | 23.35 | 9.09 | 8.51 | 6.2 |
| M16-2.0 | 24.00 | 23.67 | 27.71 | 26.75 | 10.32 | 9.68 | 7.0 |
| M20-2.5 | 30.00 | 29.16 | 34.64 | 32.95 | 12.88 | 12.12 | 8.8 |