| Nominal size of Bolts | Diameter of hole A Tolerance + 1/32 inch. | Outside Square B | Thickness C Tolerance +/- 1 gauge | |
|---|---|---|---|---|
| Inch. | S.W.G. | Inch. | ||
3/8 | 7/16 | 1 1/2 | 10 | 0.128 |
| 2 | ||||
1/2 | 9/16 | 1 1/2 | 10 | 0.128 |
| 2 | ||||
5/8 | 11/16 | 2 | 10 | 0.128 |
3 | 6 | 0.192 | ||
| 3 | 0.252 | |||
3/4 | 13/16 | 2 1/2 | 10 | 0.128 |
| 3 | 6 | 0.192 | ||
| 3 | 3 | 0.252 | ||
| 4 | ||||
7/8 | 15/16 | 2 1/2 | 10 | 0.128 |
| 3 | 3 | 0.252 | ||
1 | 1 1/16 | 3 | 3 | 0.252 |
| 4 | ||||
| 4 | 3/0 | 0.372 | ||
1 1/4 | 1 3/8 | 4 | 3 | 0.252 |
| 3/0 | 0.372 | |||