美制特細牙(UNEF)
| 美制特細UNEF | 牙數 | 下料孔徑 |
| 1/4 | 32 | 5.5 |
| 5/16 | 32 | 7.1 |
| 3/8 | 32 | 8.6 |
| 7/16 | 28 | 10.1 |
| 1/2 | 28 | 11.7 |
| 9/16 | 24 | 13.1 |
| 5/8 | 24 | 14.75 |
| 3/4 | 20 | 17.5 |
| 7/8 | 20 | 20.75 |
| 1” | 20 | 23.75 |
| 1-1/8 | 18 | 27 |
| 1-3/8 | 18 | 33 |
| 美制特細UNEF | 牙數 | 下料孔徑 |
| 1/4 | 32 | 5.5 |
| 5/16 | 32 | 7.1 |
| 3/8 | 32 | 8.6 |
| 7/16 | 28 | 10.1 |
| 1/2 | 28 | 11.7 |
| 9/16 | 24 | 13.1 |
| 5/8 | 24 | 14.75 |
| 3/4 | 20 | 17.5 |
| 7/8 | 20 | 20.75 |
| 1” | 20 | 23.75 |
| 1-1/8 | 18 | 27 |
| 1-3/8 | 18 | 33 |