ISO 4018 dimensions — Hexagon head screws, Product grade C
- Edition
- 2022 edition, current
| Size | PThread pitch | sWidth across flats | kHead height | eWidth across corners |
|---|---|---|---|---|
| max | nom. | min | ||
| M5 | 0.8 | 8 | 3.5 | 8.63 |
| M6 | 1 | 10 | 4 | 10.89 |
| M7 | 1 | 11 | 4.8 | 11.94 |
| M8 | 1.25 | 13 | 5.3 | 14.2 |
| M10 | 1.5 | 16 | 6.4 | 17.59 |
| M12 | 1.75 | 18 | 7.5 | 19.85 |
| M14 | 2 | 21 | 8.8 | 22.78 |
| M16 | 2 | 24 | 10 | 26.17 |
| M18 | 2.5 | 27 | 11.5 | 29.56 |
| M20 | 2.5 | 30 | 12.5 | 32.95 |
| M22 | 2.5 | 34 | 14 | 37.29 |
| M24 | 3 | 36 | 15 | 39.55 |
| M27 | 3 | 41 | 17 | 45.2 |
| M30 | 3.5 | 46 | 18.7 | 50.85 |
| M33 | 3.5 | 50 | 21 | 55.37 |
| M36 | 4 | 55 | 22.5 | 60.79 |
| M39 | 4 | 60 | 25 | 66.44 |
| M42 | 4.5 | 65 | 26 | 71.3 |
| M45 | 4.5 | 70 | 28 | 76.95 |
| M48 | 5 | 75 | 30 | 82.6 |
| M52 | 5 | 80 | 33 | 88.25 |
| M56 | 5.5 | 85 | 35 | 93.56 |
| M60 | 5.5 | 90 | 38 | 99.21 |
| M64 | 6 | 95 | 40 | 104.86 |
Dimensions from ISO 4018:2022, the current edition.