美制牙UNC | 牙數 | 下料孔徑 |
NO.1 | 64 | 1.5 |
NO.2 | 56 | 1.8 |
NO.3 | 48 | 2.06 |
NO.4 | 40 | 2.3 |
NO.5 | 40 | 2.65 |
NO.6 | 32 | 2.82 |
NO.8 | 32 | 3.5 |
NO.10 | 24 | 3.9 |
NO.12 | 24 | 4.6 |
1/4 | 20 | 5.25 |
5/16 | 18 | 6.7 |
3/8 | 16 | 8.06 |
7/16 | 14 | 9.5 |
1/2 | 13 | 11 |
9/16 | 12 | 12.3 |
5/8 | 11 | 13.8 |
3/4 | 10 | 16.8 |
7/8 | 9 | 19.6 |
1” | 8 | 22.6 |
1-1/8 | 7 | 25.2 |
1-1/4 | 7 | 28.4 |
1-1/2 | 6 | 34.2 |
1-3/4 | 5 | 39.5 |
2” | 4.5 | 45 |
