BS 4933 90° Countersunk Head Bolts and Screws
Table 8. 90° Countersunk Head Bolts and Screws
Dimensions in millimetres.
| Nominal size and thread diameter |
Pitch of thread |
Diameter of unthreaded shank d | Head diameter [D] D |
Radius under head r | |||
|---|---|---|---|---|---|---|---|
| Max. | Min. | Max. theoretical sharp |
Min. | Max. | |||
| M5 | 0.80 | 5.48 | 4.52 | 10 | 8.5 | 0.5 | |
| M6 | 1.00 | 6.48 | 5.52 | 12 | 10.2 | 0.5 | |
| M8 | 1.25 | 8.58 | 7.42 | 16 | 13.6 | 0.5 | |
| M10 | 1.50 | 10.58 | 9.42 | 20 | 17.0 | 0.5 | |
| M12 | 1.75 | 12.70 | 11.30 | 24 | 20.4 | 1.0 | |
| M16 | 2.00 | 16.70 | 15.30 | 32 | 27.2 | 1.0 | |
| M20 | 2.50 | 20.84 | 19.16 | 40 | 34.0 | 1.0 | |
| M24 | 3.00 | 24.84 | 23.16 | 48 | 40.8 | 1.5 | |