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；而依据市场售之标准钻头所选所的。在使用钻头的情况下，由於钻头的形状及尺寸、精度、被钻孔之材质等，对於所钻孔的尺寸、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。公制粗螺纹规格标准径2级牙钻孔径最大最小M1.0X0.250.750.7850.729M1.1X0.250.850.8850.829M1.2X0.250.950.9850.929M1.4X0.31.101.1421.075M1.6X0.351.251.3211.221M1.7X0.351.351.4211.321M1.8X0.351.451.5211.421M2.0X0.41.601.6791.567M2.2X0.451.751.8381.713M2.3X0.41.901.9791.867M2.5X0.452.102.1382.013M2.6X0.452.202.2382.113M3.0X0.52.502.5992.459M3.0X0.62.402.4402.280M3.5X0.62.903.0102.850M4.0X0.73.303.4223.242M4.0X0.753.253.3263.106M4.5X0.753.803.8783.688M5.0X0.84.204.3344.134M5.0X0.94.104.1703.930M6.0X1.05.005.1534.917M7.0X1.06.006.1535.917M8.0X1.256.806.9126.647M9.0X1.257.807.9127.647M10X1.58.508.6768.376M11X1.58.508.6768.376M12X1.7510.3010.44110.106M14X2.012.0012.21011.835M16X2.014.0014.21013.835M18X2.515.5015.74415.294M20X2.517.5017.74417.294M22X2.519.5019.74419.294M24X3.021.0021.25220.752M27X3.024.0024.25223.752Page2of10M30X3.526.5026.77126.211公制细螺纹规格标准径2级牙钻孔径最大最小M1.0X0.20.800.8210.783M1.1X0.20.900.9210.883M1.2X0.21.001.021.0983M1.4X0.21.201.2211.183M1.6X0.21.401.4211.383M1.7X0.21.451.5001.460M1.8X0.21.601.6211.583M2.0X0.251.751.7851.729M2.2X0.251.951.9851.929M2.3X0.252.052.0612.001M2.5X0.352.202.2212.121M2.6X0.352.202.2462.186M3.0X0.352.702.7212.621M3.5X0.353.203.2213.121M4.0X0.53.503.5993.459M4.5X0.54.004.0993.959M5.0X0.54.504.5994.459M5.5X0.55.005.0994.959M6.0X0.755.305.3785.188M6.0X0.55.505.5505.400M7.0X0.756.306.3786.188M7.0X0.56.506.5506.400M8.0X1.07.007.1536.917M8.0X0.757.307.3787.188M8.0X0.57.507.5207.400M9.0X1.08.008.1537.917M9.0X0.758.308.3788.188M10X1.258.808.9128.647M10X1.09.009.1538.917M10X0.759.309.3789.188M10X0.59.509.5209.400M11X1.010.0010.1539.917M11X0.7510.3010.37810.188M12X1.510.5010.67610.376M12X1.2510.8010.91210.647Page3of10公制细螺纹规格标准径2级牙钻孔径最大最小M12X1.011.0011.15310.917M12X0.511.5011.52011.400M14X1.512.5012.67612.376M14X1.013.0013.15312.917M15X1.513.5013.67613.376M15X1.014.0014.15313.917M16X1.514.5014.67614.376M16X1.015.0015.15314.917M17X1.515.5015.67615.376M17X1.016.0016.15315.917M18X2.016.0016.21015.835M18X1.516.5016.67616.376M18X1.017.0017.15316.917M20X2.018.0018.21017.835M20X1.518.5018.67618.376M20X1.019.0019.15318.917M22X2.020.0020.21019.835M22X1.520.5020.67620.376M22X1.021.0021.15320.917M24X2.022.0022.21021.835M24X1.522.5022.67622.376M24X1.023.0023.15322.917M25X2.023.0023.21022.835M25X1.523.5023.67623.376M25X1.024.0024.15323.917M26X1.524.5024.67624.376M27X2.025.0025.21024.835M27X1.525.5025.67625.376M27X1.026.0026.15325.917M28X2.026.0026.21025.835M28X1.526.5026.67626.376M28X1.027.0027.15326.917M30X3.027.0027.25226.752M30X2.028.0028.21027.835M30X1.528.5028.67628.376公制细螺纹规格标准径2级牙钻孔径最大最小M30X1.029.0029.15328.917M32X2.030.0030.21029.835M32X1.530.5030.67630.376M33X3.030.0030.25229.752M33X2.031.0031.21030.835M33X1.531.5031.67631.376M35X1.533.5033.67633.376M36X3.033.0033.25232.752M36X2.034.0034.21033.835M36X1.534.5034.67634.376美制细螺纹规格(UNF)标准径2级牙钻孔径最大最小No.0-80(1.524)(螺丝牙外1.251.3051.182No.1-72(1.854)1.551.6121.474No.2-64(2.184)1.851.9121.756No.3-56(2.515)2.102.1972.025No.4-48(2.845)2.402.4582.271No.5-44(...
