公制，英制，美制尺寸对照表
英制
| 公制（mm） | 美制牙UNC | 美制UNE细 | 直径 | 标准粗牙 | 细牙 | 新标 | 老标 | |
| 0# | 1.52 | 80 | M1.6 | 0.35 | ||||
| 1# | 1.85 | 64 | 72 | M2.0 | 0.4 | |||
| 2# | 2.18 | 56 | 64 | M2.5 | 0.45 | |||
| 3# | 2.51 | 48 | 56 | M3.0 | 0.5 | 0.35 | ||
| 4# | 2.84 | 40 | 48 | M3.5 | 0.6 | |||
| 5#(1/8") | 3.18 | 40 | 44 | M4.0 | 0.7 | 0.5 | ||
| 6# | 3.51 | 32 | 40 | M5.0 | 0.8 | 0.5 | ||
| 8# | 4.17 | 32 | 36 | M6.0 | 1.0 | 0.75 | ||
| 10#(3/16") | 4.83 | 24 | 32 | M8.0 | 1.25 | 1.0 | 13 | 14 |
| 12#(7/32") | 5.49 | 24 | 28 | M10 | 1.5 | 1.0 | 16 | 17 |
| 1/4" | 6.35 | 20 | 28 | M12 | 1.75 | 1.25 | 18 | 19 |
| 5/16" | 7.94 | 18 | 24 | M14 | 2.0 | 1.5 | 21 | 22 |
| 3/8" | 9.53 | 16 | 24 | M16 | 2.0 | 1.5 | ||
| 7/16" | 11.11 | 14 | 20 | M18 | 2.5 | 1.5 | ||
| 1/2" | 12.70 | 13 | 20 | M20 | 2.5 | 1.5 | ||
| 9/16" | 14.29 | 12 | 18 | M22 | 2.5 | 2.0 | 34 | 32 |
| 5/8" | 15.88 | 11 | 18 | M24 | 3.0 | 2.0 | ||
| 11/16" | 17.46 | M27 | 3.0 | 2.0 | ||||
| 3/4" | 19.05 | 10 | 16 | M30 | 3.5 | 2.0 | ||
| 13/16" | 20.64 | M33 | 3.5 | 3.0 | ||||
| 7/8" | 22.23 | 9 | 14 | M36 | 4.0 | 3.0 | ||
| 15/16" | 23.81 | M39 | 4.0 | 3.0 | ||||
| 1" | 25.40 | 8 | 12 | M42 | 4.5 | |||
| 1-1/8" | 28.58 | 7 | 12 | M45 | 4.5 | 3.0 | ||
| 1-1/4" | 31.75 | 7 | 12 | M48 | 5.0 | 3.0 | ||
| 1-3/8" | 34.93 | 6 | 12 | M52 | 5.0 | 4.0 | ||
| 1-1/2" | 38.10 | 6 | 12 | M56 | 5.5 | 4.0 |