螺丝攻牙钻孔径和滚造径对照表公制细螺纹美制细螺纹规格标准径2级牙钻孔径规格（UNC）标准径2级牙钻孔径最大最小最大最小M1.0×0.20.800.8210.783NO.0-80(1.524)1.251.3051.182M1.1×0.20.900.9210.883NO.1-72(1.854)1.551.6121.474M1.2×0.21.001.0210.983NO.2-64(2.184)1.851.9121.756M1.4×0.21.201.2211.183NO.3-56(2.515)2.102.1972.025M1.6×0.21.401.4211.383NO.4-48(2.845)2.402.4582.271M1.7×0.21.451.5001.460NO.5-44(3.175)2.702.7402.551M1.8×0.21.601.6211.583NO.6-40(3.505)2.903.0222.820M2.0×0.251.751.7851.729NO.8-36(4.166)3.503.6063.404M2.2×0.251.951.9851.929NO.10-32(4.826)4.104.1653.963M2.3×0.252.052.0612.001NO.12-28(5.846)4.604.7244.496M2.5×0.352.202.2212.1211/4-285.505.5885.360M2.6×0.352.202.2462.1865/16-246.907.0356.782M3.0×0.352.702.7212.6213/8-248.508.6368.382M3.5×0.353.203.2213.1217/16-209.9010.0339.729M4.0×0.53.503.5993.4591/2-2011.5011.60711.329M4.5×0.54.004.0993.9599/16-1812.9013.08112.751M5.0×0.54.504.5994.4595/8-1814.5014.68114.351M5.5×0.55.005.0994.9593/4-1617.5017.67817.323M6.0×0.755.305.3785.1887/8-1420.5020.67520.270M6.0×0.55.505.5505.4001-1223.2023.57123.114M7.0×0.756.306.3786.1881-1/8-1226.5026.74626.289M7.0×0.56.506.5506.4001-1/4-1229.5029.92129.464螺丝攻牙钻孔径和滚造径对照表公制细螺纹美制细螺纹规格标准径2级牙钻孔径规格（UNC）标准径2级牙钻孔径最大最小最大最小M8.0×1.07.007.1536.9171-3/8-1232.8033.09632.639M8.0×0.757.307.3787.1881-1/2-1236.0036.27135.814M8.0×0.57.507.5207.400M9.0×1.08.008.1537.917M9.0×0.758.308.3788.188M10×1.258.808.9128.647M10×1.09.009.1538.917M10×0.759.309.3789.188M10×0.59.509.5209.400M11×1.010.0010.1539.917M11×0.7510.3010.37810.188M12×1.510.5010.67610.376M12×1.2510.8010.91210.647M12×1.011.0011.15310.917M12×0.511.5011.52011.400M14×1.512.5012.67612.376M14×1.013.0013.15312.917M15×1.513.5013.67613.376M15×1.014.0014.15313.917M16×1.514.5014.67614.376M16×1.015.0015.15314.917M17×1.515.5015.67615.376螺丝攻牙钻孔径和滚造径对照表公制细螺纹美制细螺纹规格标准径2级牙钻孔径规格（UNC）标准径2级牙钻孔径最大最小最大最小M17×1.016.0016.15315.917M18×2.016.0016.21015.835M18×1.516.5016.67616.376M18×1.017.0017.15316.917M20×2.018.0018.21017.835M20×1.518.5018.67618.376M20×1.019.0019.15318.917M22×2.020.0020.21019.835M22×1.520.5020.67620.376M22×1.021.0021.15320.917M24×2.022.0022.21021.835M24×1.522.5022.67622.376M24×1.023.0023.15322.917M25×2.023.0023.21022.835M25×1.523.5023.67623.376M25×1.024.0024.15323.917M26×1.524.5024.67624.376M27×2.025.0025.21024.835M27×1.525.5025.67625.376M27×1.026.0026.15325.917M28×2.026.0026.21025.835M28×1.526.5026.67626.376螺丝攻牙钻孔径和滚造径对照表公制细螺纹美制细螺纹规格标准径2级牙钻孔径规格（UNC）标准径2级牙钻孔径最大最小最大最小M28×1.027.0027.15326.917M30×3.027.0027.25226.752M30×2.028.0028.21027.835M30×1.528.5028.67628.376M30×1.029.0029.15328.917M32×2.030.0030.21029.835M32×1.530.5030.67630.376M33×3.030.0030.25229.752M33×2.031.0031.21030.835M33×1.531.5031.67631.376M35×1.533.5033.67633.376M36×3.033.0033.25232.752M36×2.034.0034.21033.835M36×1.534.5034.67634.376