List of dimensions of metric hex nuts
This list contains the most important dimensions (in mm ) of the metric hexagon nuts according to ISO 4032 (normal shape), in comparison to DIN 934, which was previously valid in Germany, and ISO 4035/4036 (low form, previously DIN 439 in Germany).
| thread | Width across flats s |
Thickness mm | ||
|---|---|---|---|---|
| ISO 4032 | DIN 934 (old) | ISO 4035/4036 | ||
| M 1 | 2.5 | - | 0.8 | - |
| M 1.2 | 3.0 | - | 1.0 | - |
| M 1.4 | 3.0 | - | 1.2 | 1.0 |
| M 1.6 | 3.2 | 1.3 | 1.3 | 1.0 |
| M 2 | 4.0 | 1.6 | 1.6 | 1.2 |
| M 2.5 | 5.0 | 2.0 | 2.0 | 1.6 |
| M 3 | 5.5 | 2.4 | 2.4 | 1.8 |
| M 3.5 | 6.0 | 2.8 | 2.8 | 2.0 |
| M 4 | 7.0 | 3.2 | 3.2 | 2.2 |
| M 5 | 8.0 | 4.7 | 4.0 | 2.7 |
| M 6 | 10.0 | 5.2 | 5.0 | 3.2 |
| M 8 | 13.0 | 6.8 | 6.5 | 4.0 |
| M 10 | 16.0 (17.0) | 8.4 | 8.0 | 5.0 |
| M 12 | 18.0 (19.0) | 10.8 | 10.0 | 6.0 |
| M 14 | 21.0 (22.0) | 12.8 | 11.0 | 7.0 |
| M 16 | 24.0 | 14.8 | 13.0 | 8.0 |
| M 18 | 27.0 | 15.8 | 15.0 | 9.0 |
| M 20 | 30.0 | 18.0 | 16.0 | 10.0 |
| M 22 | 34.0 (32.0) | 19.4 | 18.0 | 11.0 |
| M 24 | 36.0 | 21.5 | 19.0 | 12.0 |
| M 30 | 46.0 | 25.6 | 24.0 | 15.0 |
| M 33 | 50.0 | 28.7 | 26.0 | 16.5 |
| M 36 | 55.0 | 31.0 | 29.0 | 18.0 |
| M 39 | 60.0 | 33.4 | 31.0 | 19.5 |
| M 42 | 65.0 | 34.0 | 34.0 | 21.0 |
| M 45 | 70.0 | 36.0 | 36.0 | 22.5 |
| M 48 | 75.0 | 38.0 | 38.0 | 24.0 |
| M 52 | 80.0 | 42.0 | 42.0 | 26.0 |
| M 56 | 85.0 | 45.0 | - | 28.0 |
| M 64 | 95 | 51.0 | - | 32.0 |
The different wrench sizes according to DIN 934 and DIN 439 are in brackets.