公制螺纹及美制螺纹的牙距：
| 规格 | 牙距 | 规 格 | 称 呼 径 | 牙数 | ||||
| 粗牙 | 细牙 | 极细牙 | 粗牙 | 细牙 | 韦氏牙 | |||
| M3 | 0.5 | 0.35 | 4# | 2.9 | 40 | 48 | ||
| M4 | 0.7 | 0.5 | 6# | 3.5 | 32 | 40 | ||
| M5 | 0.8 | 0.5 | 8# | 4.2 | 32 | 36 | ||
| M6 | 1.0 | 0.75 | 10# | 4.8 | 24 | 32 | ||
| M7 | 1.0 | 0.75 | 12# | 5.5 | 24 | 28 | ||
| M8 | 1.25 | 1.0 | 0.75 | 1/4 | 6.35 | 20 | 28 | 20 |
| M10 | 1.5 | 1.25 | 1.0 | 5/16 | 7.94 | 18 | 24 | 18 |
| M12 | 1.75 | 1.5 | 1.25 | 3/8 | 9.53 | 16 | 24 | 16 |
| M14 | 2.0 | 1.5 | 1.0 | 7/16 | 11.11 | 14 | 20 | 14 |
| M16 | 2.0 | 1.5 | 1.0 | 1/2 | 12.7 | 13 | 20 | 12 |
| M18 | 2.5 | 2.0 | 1.5 | 9/16 | 14.29 | 12 | 18 | 12 |
| M20 | 2.5 | 2.0 | 1.5 | 5/8 | 15.86 | 11 | 18 | 11 |
| M22 | 2.5 | 2.0 | 1.5 | 3/4 | 19.05 | 10 | 16 | 10 |
| M24 | 3.0 | 2.0 | 1.5 | 7/8 | 22.23 | 9 | 14 | 9 |
| M27 | 3.0 | 2.0 | 1.5 | 1 | 25.40 | 8 | 12 | 8 |
| M30 | 3.5 | 3.0 | 2.0 | |||||
下面是自攻螺纹的牙距：
| 规格 | S T 1.5 | S T 1.9 | S T 2.2 | S T 2.6 | S T 2.9 | S T 3.3 | S T 3.5 | S T 3.9 | S T 4.2 | S T 4.8 | S T 5.5 | S T 6.3 | S T 8.0 | S T 9.5 |
| 牙距 | 0.5 | 0.6 | 0.8 | 0.9 | 1.1 | 1.3 | 1.3 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 | 2.1 | 2.1 |
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