BS 4933 Cup Square Bolts
Table 7. Cup Square Bolts
Dimensions in millimetres.
| Nominal size and thread diameter |
Pitch of thread |
Diameter of unthreaded shank and width A.F. of square neck d |
Head diameter D | Head thickness k | Length of square neck C | Radius under head and at corners and end of square neck r |
|||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Max. | Min. | Max. | Min. | Max. | Min. | Max. | Min. | Max. | |||
| M5 | 0.80 | 5.48 | 4.52 | 11.3 | 10.2 | 3.1 | 2.5 | 3.10 | 2.4 | 0.5 | |
| M6 | 1.00 | 6.48 | 5.52 | 13.5 | 12.4 | 3.6 | 3.0 | 3.60 | 3.0 | 0.5 | |
| M8 | 1.25 | 8.58 | 7.42 | 18.0 | 16.9 | 4.8 | 4.0 | 4.75 | 4.0 | 0.5 | |
| M10 | 1.50 | 10.58 | 9.42 | 22.5 | 21.2 | 5.8 | 5.0 | 5.75 | 5.0 | 0.5 | |
| M12 | 1.75 | 12.70 | 11.30 | 27.0 | 25.7 | 6.8 | 6.0 | 6.75 | 6.0 | 1.0 | |
| M16 | 2.00 | 16.70 | 15.30 | 36.0 | 34.4 | 8.9 | 8.0 | 8.90 | 8.0 | 1.0 | |
| M20 | 2.50 | 20.84 | 19.16 | 45.0 | 43.4 | 10.0 | 10.0 | 10.90 | 10.0 | 1.0 | |
| M24 | 3.00 | 24.84 | 23.16 | 54.0 | 52.1 | 13.0 | 12.0 | 13.10 | 12.0 | 1.5 | |