标准螺纹连接件，螺纹螺距对照表！DIY的朋友可以参考一下！
螺纹底孔为螺纹直径减去螺距，如果是软材料或者比较薄的材料，底孔可以再稍微小一点！
括号内的是不建议选型使用的！
| 螺纹 | 粗 牙 | 细 牙 |
| M1 | 0.25 | 0.2 |
| M1.1 | 0.25 | 0.2 |
| M1.6 | 0.35 | 0.2 |
| M2 | 0.4 | 0.25 |
| M2.5 | 0.45 | 0.35 |
| M3 | 0.5 | 0.35 |
| M4 | 0.7 | 0.5 |
| M5 | 0.8 | 0.5 |
| M6 | 1 | 0.75, (0.5) |
| M8 | 1.25 | 1, 0.75, (0.5) |
| M10 | 1.5 | 1.25, 1, 0.75, (0.5) |
| M12 | 1.75 | 1.5, 1.25, 1, (0.75), (0.5) |
| (M14) | 2 | 1.5, 1.25, 1, (0.75), (0.5) |
| M16 | 2 | 1.5, 1.25, 1, (0.75), (0.5) |
| (M18) | 2.5 | 2, 1.5, 1.25, 1, (0.75), (0.5) |
| M20 | 2.5 | 2, 1.5, 1.25, 1, (0.75), (0.5) |
| (M22) | 2.5 | 2, 1.5, 1.25, 1, (0.75), (0.5) |
| M24 | 3 | 2, 1.5, 1, (0.75) |
| (M27) | 3 | 2, 1.5, 1, (0.75) |
| M30 | 3.5 | 3, 2, 1.5, 1, (0.75) |
| (M33) | 3.5 | (3), 2, 1.5, 1, (0.75) |
| M36 | 4 | 3, 2, 1.5, (1) |
| (M39) | 4 | 3, 2, 1.5, (1) |
| M42 | 4.5 | (4), 3, 2, 1.5, (1) |
| (M45) | 4.5 | (4), 3, 2, 1.5, (1) |
| M48 | 5 | (4), 3, 2, 1.5, (1) |
| (M52) | 5 | (4), 3, 2, 1.5, (1) |
| M56 | 5.5 | 4, 3, 2, 1.5, (1) |
| (M60) | 5.5 | 4, 3, 2, 1.5, (1) |
| M64 | 6 | 4, 3, 2, 1.5, (1) |
| (M68) | 6 | 4, 3, 2, 1.5, (1) |
| M72 | 6 | 4, 3, 2, 1.5, (1) |
| (M76) | 6 | 4, 3, 2, 1.5, (1) |
| M80 | 6 | 4, 3, 2, 1.5, (1) |
