| Standard (in) | Metric (mm) | ||
| Fractional | Decimal | Decimal (Actual) | Decimal (Common) |
| 1/32 | 0.03125 | 0.79375 | 0.80 |
| 1/16 | 0.0625 | 1.5875 | 1.50 |
| 3/32 | 0.09375 | 2.38125 | 2.50 |
| 1/8 | 0.125 | 3.175 | 3.00 |
| 5/32 | 0.15625 | 3.96875 | 4.00 |
| 3/16 | 0.1875 | 4.7625 | 4.75 |
| 7/32 | 0.21875 | 5.55625 | 5.50 |
| 1/4 | 0.25 | 6.35 | 6.00 |
| 9/32 | 0.28125 | 7.14375 | 7.00 |
| 5/16 | 0.3125 | 7.9375 | 8.00 |
| 11/32 | 0.34375 | 8.73125 | 8.75 |
| 3/8 | 0.375 | 9.525 | 9.50 |
| 13/32 | 0.40625 | 10.31875 | 10.50 |
| 7/16 | 0.4375 | 11.1125 | 11.00 |
| 15/32 | 0.46875 | 11.90625 | 12.00 |
| 1/2 | 0.5 | 12.7 | 12.00 |
| 17/32 | 0.53125 | 13.49375 | 13.50 |
| 9/16 | 0.5625 | 14.2875 | 14.25 |
| 19/32 | 0.59375 | 15.08125 | 15.00 |
| 5/8 | 0.625 | 15.875 | 16.00 |
| 21/32 | 0.65625 | 16.66875 | 16.50 |
| 11/16 | 0.6875 | 17.4625 | 17.50 |
| 23/32 | 0.71875 | 18.25625 | 18.00 |
| 3/4 | 0.75 | 19.05 | 19.00 |
| 25/32 | 0.78125 | 19.84375 | 19.75 |
| 13/16 | 0.8125 | 20.6375 | 20.00 |
| 27/32 | 0.84375 | 21.43125 | 21.50 |
| 7/8 | 0.875 | 22.225 | 22.00 |
| 29/32 | 0.90625 | 23.01875 | 23.00 |
| 15/16 | 0.9375 | 23.8125 | 24.00 |
| 31/32 | 0.96875 | 24.60625 | 24.50 |
| 1/1 | 1 | 25.4 | 25.50 |
62-478 2018