| 型号 | d | D | ||
| mm | in. | mm | in. | |
| R2 | 3.175 | 1/8 | 9.525 | 3/8 | R2A | 3.175 | 1/8 | 12.7 | 1/2 |
| R3 | 4.762 | 3/16 | 12.7 | 1/2 | R4 | 6.35 | 1/4 | 15.875 | 5/8 |
| R4A | 6.35 | 1/4 | 19.05 | 3/4 | R6 | 9.525 | 3/8 | 22.225 | 7/8 |
| R8 | 12.7 | 1/2 | 28.575 | 11/8 | R10 | 15.875 | 5/8 | 34.525 | 13/8 |
| R12 | 19.05 | 3/4 | 41.275 | 15/8 | R14 | 22.225 | 7/8 | 47.625 | 17/8 |
| R16 | 25.4 | 1 | 50.8 | 2 | R18 | 28.575 | 11/8 | 53.975 | 21/8 |
