ISO 14581 dimensions — Hexalobular socket countersunk flat head screws
- Edition
- dimensions from the 2013 edition · current edition ISO 14581:2022
| Size | PThread pitch | dkTheoretical head diameter | kHead height | Recess number | AHexalobular socket a | tSocket depth | bThread length | |||
|---|---|---|---|---|---|---|---|---|---|---|
| min | max | nom. | ref. | min | max | l ≤ 125 | ||||
| M2 | 0.4 | 3.8 | 3.5 | 4.4 | 1.2 | 6 | 1.75 | 0.51 | 0.64 | 25 |
| M2.5 | 0.45 | 4.7 | 4.4 | 5.5 | 1.5 | 8 | 2.4 | 0.66 | 0.79 | 25 |
| M3 | 0.5 | 5.5 | 5.2 | 6.3 | 1.65 | 10 | 2.8 | 0.7 | 0.83 | 25 |
| M3.5 | 0.6 | 7.3 | 6.94 | 8.2 | 2.35 | 15 | 3.35 | 1.16 | 1.32 | 38 |
| M4 | 0.7 | 8.4 | 8.04 | 9.4 | 2.7 | 20 | 3.95 | 1.14 | 1.53 | 38 |
| M5 | 0.8 | 9.3 | 8.94 | 10.4 | 2.7 | 25 | 4.5 | 1.12 | 1.51 | 38 |
| M6 | 1 | 11.3 | 10.87 | 12.6 | 3.3 | 30 | 5.6 | 1.39 | 1.78 | 38 |
| M8 | 1.25 | 15.8 | 15.37 | 17.3 | 4.65 | 45 | 7.95 | 2.15 | 2.54 | 38 |
| M10 | 1.5 | 18.3 | 17.78 | 20 | 5 | 50 | 8.95 | 2.41 | 2.8 | 38 |
Dimensions from ISO 14581:2013. The current edition is ISO 14581:2022.