| metric system | USA |
| 1.00 mm | 12/6 |
| 1.25 mm | 9/4 |
| 1.50 mm | 8/7/2 |
| 1.75 mm | 4/0 |
| 2.00 mm | 4 |
| 2.25 mm | B/1 |
| 2.50 mm | |
| 2.75 mm | C/2 |
| 3.00 mm | |
| 3.25 mm | D/3 |
| 3.50 mm | E/4 |
| 3.75 mm | F/5 |
| 4.00 mm | G/6 |
| 4.50 mm | 7 |
| 5.00 mm | H/8 |
| 5.50 mm | I/9 |
| 6.00 mm | J/10 |
| 6.50 mm | K/10.5 |
| 7.00 mm | |
| 8.00 mm | L/11 |
| 9.00 mm | M/13 |
| 10.00 mm | N/15 |
| 12.00 mm | O |
| 15.00 mm | P/16 |
| 16.00 mm | Q |
