BS 4168 Hexagon Socket Button Head Screws
| Nom. Size, D | Head Diameter, A | Head Height,H | Head Side Heigh, S | Hexagon Socket Size,J | Key Engagement, K | Fillet Radius | |||
|---|---|---|---|---|---|---|---|---|---|
| F | da | ||||||||
| Max. | Min. | Max. | Min. | Ref. | Nom. | Min. | Min. | Max. | |
| BS 4168 - M3 | 5.5 | 5.32 | 1.6 | 1.4 | 0.38 | 2 | 1.04 | 0.1 | 3.6 |
| BS 4168 - M4 | 7.5 | 7.28 | 2.1 | 1.85 | 0.38 | 2.5 | 1.3 | 0.2 | 4.7 |
| BS 4168 - M5 | 9.5 | 9.28 | 2.7 | 2.45 | 0.5 | 3 | 1.56 | 0.2 | 5.7 |
| BS 4168 - M6 | 10.5 | 10.23 | 3.2 | 2.95 | 0.8 | 4 | 2.08 | 0.25 | 6.8 |
| BS 4168 - M8 | 14 | 13.73 | 4.3 | 3.95 | 0.8 | 5 | 2.6 | 0.4 | 9.2 |
| BS 4168 - M10 | 18 | 17.73 | 5.3 | 4.95 | 0.8 | 6 | 3.12 | 0.4 | 11.2 |
| BS 4168 - M12 | 21 | 20.67 | 6.4 | 5.9 | 0.8 | 8 | 4.16 | 0.6 | 14.2 |
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