DIN 557 dimensions — Square nuts
- Edition
- current edition DIN 557:2026-02
| Size | PThread pitch | sWidth across flats | mNut height | eWidth across corners | dwBearing diameter | Wrenching height | |||
|---|---|---|---|---|---|---|---|---|---|
| min | max | min | min | max | min | min | |||
| M5 | 0.8 | 7.64 | 8 | 4 | 3.52 | 9.93 | 11.3 | 6.7 | 2.5 |
| M6 | 1 | 9.64 | 10 | 5 | 4.52 | 12.53 | 14.1 | 8.7 | 3.2 |
| M8 | 1.25 | 12.57 | 13 | 6.5 | 5.92 | 16.34 | 18.4 | 11.5 | 4.1 |
| M10 | 1.5 | 16.57 | 17 | 8 | 7.42 | 21.54 | 24 | 14.5 | 5.2 |
| M12 | 1.75 | 18.57 | 19 | 10 | 9.42 | 24.02 | 26.9 | 16.5 | 6.6 |
| M16 | 2 | 23.16 | 24 | 13 | 12.3 | 30.11 | 33.9 | 22 | 8.6 |
Current edition: DIN 557:2026-02.