DIN 7990 Hexagon bolts for steel constructures. This standard specifies the dimensions, threads, tolerances, performance classes and their corresponding millimeter measurement specifications for hexagon head bolts of grade C from M12 to M30. It also specifies the nuts and washers to be used. Hexagon head bolts conforming to this standard are also suitable for aluminum and composite structures.
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DIN 7990 Dimensions
| mm | P | da max | ds min | ds max | e min | k min | k max | r min | s max | s min |
|---|---|---|---|---|---|---|---|---|---|---|
| M12 | 1.75 | 14.7 | 11.3 | 12.7 | 19.85 | 7.55 | 8.45 | 0.6 | 18 | 17.57 |
| M16 | 2.00 | 18.7 | 15.3 | 16.7 | 26.17 | 9.25 | 10.75 | 0.6 | 24 | 23.16 |
| M20 | 2.50 | 24.4 | 19.16 | 20.84 | 32.95 | 12.1 | 13.9 | 0.8 | 30 | 29.16 |
| M24 | 3.00 | 28.4 | 23.16 | 24.84 | 39.55 | 14.1 | 15.9 | 0.8 | 36 | 35.00 |
| M27 | 3.00 | 32.4 | 26.16 | 27.84 | 45.20 | 16.1 | 17.9 | 1.0 | 41 | 40.00 |
| M30 | 3.50 | 35.4 | 29.16 | 30.84 | 50.85 | 17.95 | 20.05 | 1.0 | 46 | 45.00 |