螺丝攻牙孔径对照表

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1、螺纹攻牙钻孔径和滚造径对照表本表所推选之钻头孔径，是针对攻牙加工时，能够很容易的了解钻孔直径；而依据市售之标准钻头所选定的。在使用钻头的情况下，由于钻头的形状及尺寸、精度、被钻孔之材质等，对于所钻孔的尺寸、精度有很大的影响，所以使用本表之钻孔径，若有不当之处，应视实际状况适当的变更钻头直径。本表是依据2级牙制订。公制粗螺纹公公制细螺纹制迫牙丝攻钻孔径美制迫牙丝攻钻孔径英制螺纹2级牙钻孔径2级牙钻孔径精度等级精度等级钻孔径规格标准径规格标准径规格规格规格最大最小最大最小G4-G6G7-G8G9G4-G6G7-G8G9硬材软材M1.0*0.250.750.7850.729M12*1.011.

2、0011.15310.917M1.0*0.250.860.88No.2-56UNC1.94W1/8-402.652.60M1.1*0.250.850.8850.829M12*0.511.5011.52011.400M1.1*0.250.960.98No.3-482.23W5/32-323.253.20M1.2*0.250.950.9850.929M14*1.512.5012.67612.376M1.2*0.251.061.08No.4-402.50W3/16-243.753.70M1.4*0.31.101.1421.075M14*1.013.0013.15312.917M1.4*0.31

3、.241.25No.5-402.83W1/4-205.105.00M1.6*0.351.251.3211.221M15*1.513.5013.67613.376M1.6*0.351.411.43No.6-323.07W5/16-186.606.50M1.7*0.351.351.4211.321M15*1.014.0014.15313.917M1.7*0.351.511.53No.8-323.733.77W3/8-168.007.90M1.8*0.351.451.5211.421M16*1.514.5014.67614.376M1.8*0.351.611.63No.10-244.244.3

4、0W7/16-149.409.30M2.0*0.41.601.6791.567M16*1.015.0015.15314.917M2*0.41.781.80No.12-244.904.96W1/2-1210.7010.50M2.2*0.451.751.8381.713M17*1.515.5015.67615.376M2.2*0.451.951.981/4-205.72W9/16-1212.3012.00M2.3*0.41.901.9791.867M17*1.016.0016.15315.917M2.3*0.42.082.105/16-187.24W5/8-1113.7013.50M2.5*

5、0.452.102.1382.013M18*2.016.0016.21015.835M2.5*0.452.252.283/8-168.748.81W3/4-1016.7016.50M2.6*0.452.202.2382.113M18*1.516.5016.67616.376M2.6*0.452.352.387/16-1410.2010.30W7/8-919.5019.30M3.0*0.52.502.5992.459M18*1.017.0017.15316.917M3.0*0.52.732.751/2-1311.2711.82W1-822.4022.00M3.0*0.62.402.4402

6、.280M20*2.018.0018.21017.835M3.5*0.63.173.20No.2-64UNF1.97W1-1/8-725.0024.80M3.5*0.62.903.0102.850M20*1.518.5018.67618.376M4.0*0.73.623.653.69No.3-562.27W1-1/4-728.3028.00M4.0*0.73.303.4223.242M20*1.019.0019.15318.917M5.0*0.84.564.604.64No.4-482.56M4.0*0.753.253.3263.106M22*2.020.0020.21019.835M6

7、.0*1.05.455.505.55No.5-442.86M4.5*0.753.803.8783.688M22*1.520.5020.67620.376M7.0*1.06.456.506.55No.6-403.16针车用螺纹M5.0*0.84.204.3344.134M22*1.021.0021.15320.917M8.0*1.257.317.387.44No.8-363.78M5.0*0.94.104.1703.930M24*2.