Hexagon socket countersunk tapping screws
National standard
Diameter range: ST2-ST8 Length range: 4mm-80mm
| standard | GB national standard |
|---|---|
| head shape | sunken head |
| Groove | Hexagon socket |
| Thread | Fully threaded |
| Nominal diameter (d) | Head thickness (k) | Head diameter (dk) | Hexagonal opposite sides(s) | Applicable wrench |
|---|---|---|---|---|
| M2 | 0.8 | 3.4 | 1.3 | 1.27 |
| M2.3 | 1.4 | 3.9 | 1.4 | 1.27 |
| M2.6 | 1.2 | 5 | 1.6 | 1.5 |
| M3 | 2.1 | 6.5 | 2 | 2 |
| M3.5 | 2.5 | 6.66 | 2.5 | 2.5 |
| M4 | 3 | 7.7 | 2.5 | 2.5 |
| M5 | 4 | 9.8 | 3 | 3 |
| M6 | 4.3 | 11.9 | 4 | 4 |
| M8 | 6.2 | 16 | 5 | 5 |
| M10 | 5.5 | 19.5 | 6 | 6 |
