BS 4933 120° Countersunk Sqaure Bolts
Table 10. 120° Countersunk Sqaure Bolts
Dimensions in millimetres.
| Nominal size and thread diameter |
Pitch of thread |
Diameter of unthreaded shank and width a.f. of sqaure neck d | Head diameter | Combined length of sqaure neck and head thickness K | Radius under head, at corners and at the end of sqaure neck r | |||
|---|---|---|---|---|---|---|---|---|
| [D] | D | |||||||
| Max. | Min. | Max. theoretical sharp |
Min. | Max. | Min. | Max. | ||
| M5 | 0.80 | 5.48 | 4.52 | 11.25 | 8.65 | 4.25 | 3.5 | 0.5 |
| M6 | 1.00 | 6.48 | 5.52 | 13.50 | 10.38 | 4.75 | 4.0 | 0.5 |
| M8 | 1.25 | 8.58 | 7.42 | 18.00 | 13.84 | 6.25 | 5.5 | 0.5 |
| M10 | 1.50 | 10.58 | 9.42 | 22.50 | 17.30 | 7.90 | 7.0 | 0.5 |
| M12 | 1.75 | 12.70 | 11.30 | 27.00 | 20.76 | 9.4 | 8.5 | 1.0 |
| M16 | 2.00 | 16.70 | 15.30 | 36.00 | 27.68 | 12.1 | 11.0 | 1.0 |
| M20 | 2.50 | 20.84 | 19.16 | 45.00 | 34.60 | 15.1 | 14.0 | 1.0 |
| M24 | 3.00 | 24.84 | 23.16 | 54.00 | 41.52 | 17.6 | 16.5 | 1.5 |