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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M1.0X0.250.750.7850.729M1.1X0.250.850.8850.829M1.2X0.250.950.9850.929M1.4X0.31.101.1421.075M1.6X0.351.251.3211.221M1.7X0.351.351.4211.321M1.8X0.351.451.5211.421M2.0X0.41.601.6791.567M2.2X0.451.751.8381.713M2.3X0.41.901.9791.867M2.5X0.452.102.1382.013M2.6X0.452.202.2382.113M3.0X0.52.502.5992.459M3.0X0.62.402.4402.280M3.5X0.62.903.0102.850M4.0X0.73.303.4223.242M4.0X0.753.253.3263.106M4.5X0.753.803.8783.688M5.0X0.84.204.3344.134M5.0X0.94.104.1703.930M6.0X1.05.005.1534.917M7.0X1.06.006.1535.917M8.0X1.256.806.9126.647M9.0X1.257.807.9127.647M10X1.58.508.6768.376M11X1.58.508.6768.376M12X1.7510.3010.44110.106M14X2.012.0012.21011.835M16X2.014.0014.21013.835M18X2.515.5015.74415.294M20X2.517.5017.74417.294M22X2.519.5019.74419.294M24X3.021.0021.25220.752

M27X3.024.0024.25223.752M30X3.526.5026.77126.211公制细螺纹规格标准径2级牙钻孔径最大最小M1.0X0.20.800.8210.783M1.1X0.20.900.9210.883M1.2X0.21.001.021.0983M1.4X0.21.201.2211.183M1.6X0.21.401.4211.383M1.7X0.21.451.5001.460M1.8X0.21.601.6211.583M2.0X0.251.751.7851.729M2.2X0.251.951.9851.929M2.3X0.252.052.0612.001M2.5X0.352.202.2212.121M2.6X0.352.202.2462.186M3.0X0.352.702.7212.621M3.5X0.353.203.2213.121M4.0X0.53.503.5993.459M4.5X0.54.004.0993.959M5.0X0.54.504.5994.459M5.5X0.55.005.0994.959M6.0X0.755.305.3785.188M6.0X0.55.505.5505.400M7.0X0.756.306.3786.188M7.0X0.56.506.5506.400M8.0X1.07.007.1536.917M8.0X0.757.307.3787.188M8.0X0.57.507.5207.400M9.0X1.08.008.1537.917M9.0X0.758.308.3788.188M10X1.258.808.9128.647M10X1.09.009.1538.917M10X0.759.309.3789.188

M10X0.59.509.5209.400M11X1.010.0010.1539.917M11X0.7510.3010.37810.188M12X1.510.5010.67610.376M12X1.2510.8010.91210.647公制细螺纹规格标准径2级牙钻孔径最大最小M12X1.011.0011.15310.917M12X0.511.5011.52011.400M14X1.512.5012.67612.376M14X1.013.0013.15312.917M15X1.513.5013.67613.376M15X1.014.0014.15313.917M16X1.514.5014.67614.376M16X1.015.0015.15314.917M17X1.515.5015.67615.376M17X1.016.0016.15315.917M18X2.016.0016.21015.835M18X1.516.5016.67616.376M18X1.017.0017.15316.917M20X2.018.0018.21017.835M20X1.518.5018.67618.376M20X1.019.0019.15318.917M22X2.020.0020.21019.835M22X1.520.5020.67620.376M22X1.021.0021.15320.917M24X2.022.0022.21021.835M24X1.522.5022.67622.376M24X1.023.0023.15322.917M25X2.023.0023.21022.835M25X1.523.5023.67623.376M25X1.024.0024.15323.917M26X1.524.5024.67624.376M27X2.025.0025.21024.835

M27X1.525.5025.67625.376M27X1.026.0026.15325.917M28X2.026.0026.21025.835M28X1.526.5026.67626.376M28X1.027.0027.15326.917M30X3.027.0027.25226.752M30X2.028.0028.21027.835M30X1.528.5028.67628.376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(3.175)2.702.7402.551No.6-40⑶505)2.903.0222.820No.8-36(4.166)3.503.6063.404No.10-32(4.826)4.104.1653.963No.12-28(5.846)4.604.7244.4961/4-285.505.5885.3605/16-246.907.0356.782

3/8-248.508.6368.3827/16-209.9010.0339.7291/2-2011.5011.60711.3299/16-1812.9013.08112.7515/8-1814.5014.68114.3513/4-1617.5017.67817.3237/8-1420.5020.67520.2701-1223.2023.57123.1141-1/8-1226.5026.74626.2891-1/4-1229.5029.92129.464美制细螺纹规格标准径2级牙钻孔径最大最小1-3/8-1232.8033.09632.6391-1/2-1236.036.27135.814公制迫牙丝攻钻孔径规格精度等级G4-G6G7-G8G9M1.0X0.250.860.88M1.1X0.250.960.98M1.2X0.251.061.08M1.4X0.31.241.25M1.6X0.351.411.43M1.7X0.351.511.53M1.8X0.351.611.63M2.0X0.41.781.80M2.2X0.451.951.98M2.3X0.42.082.10M2.5X0.452.252.28M2.6X0.452.352.38M3.0X0.52.732.75M3.5X0.63.173.20M4.0X0.73.623.653.69M5.0X0.84.564.604.64

M6.0X1.05.455.505.55M7.0X1.06.456.506.55M8.0X1.257.317.387.44M10X1.59.189.259.32M10X1.259.319.389.44M12X1.7511.0411.1211.21M12X1.2511.3111.3811.44注:迫牙丝攻之钻孔径,在上表所列之数值,由於被加工材料之材质、硬度、形状、尺寸等之影响,多少会有所变动,因此於参考上表之同时,亦请增减若干。美制粗螺纹规格(UNC)标准径2级牙钻孔径最大最小No.1-64(1.854)(螺丝牙1.551.5821.425No.2-56(2.184)1.801.8711.695No.3-48(2.515)2.102.1461.941No.4-40(2.845)2.302.3852.157No.5-40(3.175)2.602.6972.487No.6-32⑶505)2.802.8952.642No.8-32(4.166)3.403.5303.302No.10-24(4.826)3.903.9623.683No.12-24(5.486)4.504.5974.3441/4-205.105.2574.9795/16-186.606.7316.4013/8-168.008.1537.7987/16-149.409.5509.1441/2-1310.8011.02310.5929/16-1212.2012.44611.9895/8-1113.6012.86813.3863/4-1016.5018.84016.3077/8-919.5019.76119.1771-822.2022.60621.9711-1/8-725.0025.34924.6381-1/4-728.2028.52427.813

1-3/8-630.8031.11530.3531-1/2-634.0034.29033.5281-3/4-539.5039.82738.9642-4-1/245.2045.59344.679美制特细螺纹规格(UNEF)标准径2级牙钻孔径最大最小No.12-324.704.8264.6231/4-325.605.6905.4865/16-327.107.2647.0873/8-328.708.8658.6617/16-2810.2010.33810.1351/2-2811.8011.93811.7099/16-2413.2013.38613.132美制特细螺纹规格(UNEF)标准径2级牙钻孔径最大最小5/8-2414.8014.98614.7323/4-2017.8017.95817.6787/8-2021.0021.13320.8531-2024.0024.30824.028英制管螺纹规格标准径钻孔径最大最小PS1/16-286.506.6326.490PS1/8-288.508.6378.495PS1/4-1911.4011.54911.341PS3/8-1915.0015.05414.846PS1/2-1418.5018.77318.489PS3/4-1424.0024.25923.975PS1-1130.2030.47130.111PS1-1/4-1138.8039.13238.772PS1-1/2-1144.8045.02544.665PS2-1156.5056.83656.476

英制管螺纹规格标准径有效牙部之长度(最小)中之母螺牙标准长度(最小)中之母螺牙内径使用绞刀时不用绞刀时PT1/16-286.106.206.2446.384PT1/8-288.108.208.2498.388PT1/4-1910.7011.0010.96211.174PT3/8-1914.2014.5014.44814.658PT1/2-1417.6018.0017.97918.263PT3/4-1423.0023.5023.37823.663PT1-1129.0029.5029.45929.822PT1-1/4-1137.5038.0037.97638.33

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