上限下限上限下限上限下限上限下限上限下限M1.0*0.250.750.7850.729M1.0*0.20.800.8210.783NO.1 UNC641.551.5821.425NO.0 UNF801.251.3051.1821/16W601.151.21.1
M1.1*0.250.750.8850.829M1.1*0.20.900.9210.883NO.2 UNC561.801.8711.695NO.1 UNF721.551.6121.4743/32W481.81.91.7
M1.2*0.250.950.9850.929M1.2*0.21.001.0210.983NO.3 UNC482.102.1461.941NO.2 UNF641.851.9121.7561/8W402.62.652.60
M1.4*0.251.101.1421.075M1.4*0.21.201.2211.183NO.4 UNC402.302.3852.157NO.3 UNF562.102.1972.0255/32W323.23.253.20
M1.6*0.351.251.3211.221M1.6*0.21.401.4211.383NO.5 UNC402.602.6972.487NO.4 UNF582.402.4582.2713/16W243.63.753.25
M1.7*0.451.351.4211.321M1.8*0.21.601.6211.583NO.6 UNC322.802.8952.642NO.5 UNF442.702.7402.5511/4W205.05.15.0
M1.8*0.451.451.5211.421M2.0*0.251.751.7851.729NO.8 UNC323.403.5303.302NO.6 UNF402.903.0222.8205/16W186.56.66.5
M2.0*0.51.601.6791.567M2.5*0.352.202.2212.121NO.10 UNC243.903.9623.683NO.8 UNF363.503.6063.4043/8W167.98.07.9
M2.2*0.61.751.8381.713M3.0*0.352.702.7212.621NO.12 UNC244.504.5974.344NO.10 UNF324.104.1653.9637/16W149.39.49.3
M2.3*0.61.901.9791.867M3.5*0.352.203.2213.1211/4 UNC205.105.2574.979NO.12 UNF284.604.7244.4961/2W1210.510.710.5
M2.5*0.452.102.1382.013M4.0*0.53.503.5993.4595/16 UNC186.606.7316.4011/4 UNF285.505.5885.3609/16W1212.112.312.0
M2.6*0.452.202.2382.113M4.5*0.54.004.0993.9593/8 UNC168.008.1537.7985/16 UNF246.907.0356.7825/8W1113.513.713.5
M3.0*0.52.502.5992.459M5.0*0.54.504.5994.4597/16 UNC149.409.5509.1443/8 UNF248.508.6368.3823/4W1016.516.716.5
M3.0*0.62.402.4402.280M5.5*0.55.005.0994.9591/2 UNC1310.8011.02310.3927/16 UNF209.9010.0339.7297/8W919.719.519.3
M3.5*0.62.903.0102.850M6.0*0.755.305.3785.1889/16 UNC1212.2012.44611.9891/2 UNF2011.5011.60711.3291W822.022.422.0
M4.0*0.73.303.4223.242M7.0*0.756.306.3786.1885/8 UNC1113.6013.86813.3869/16 UNF1812.9013.08112.7511 1/8W724.825.024.8
M4.0*0.753.253.3263.106M8.0*1.07.007.1536.9173/4 UNC1016.5016.84016.3075/8 UNF1814.5014.68114.3511 1/4W728.028.328.0
M4.5*0.753.803.8783.688M8.0*0.757.307.3787.1887/8 UNC919.5019.76119.1773/4 UNF1617.5017.67817.3231 3/8W630.330.530.3
M5.0*0.84.204.3344.134M9.0*1.08.008.1537.9171 UNC822.2022.60621.9717/8 UNF1420.5020.67520.2701 1/2W633.533.833.5
M5.0*0.94.104.1703.930M9.0*0.758.308.3788.1881 1/8 UNC725.0025.34924.6381 UNF1223.2023.57123.1141 5/8W535.736.035.7
M6.0*1.05.005.1534.917M10.0*1.258.808.9128.6471 1/4 UNC728.2028.52427.8131 1/8 UNF1226.5026.74626.2891 3/4W539.039.239.0
M7.0*1.06.006.1535.917M10.0*1.09.009.1538.9171 3/8 UNC630.8031.11530.3531 1/4 UNF1229.5029.92129.4641 7/8W4 1/241.541.841.5
M8.0*1.258.806.9126.647M10.0*1.759.309.3789.1881 1/2 UNC634.0034.29033.5281 3/8 UNF1232.8033.09632.6392W4 1/244.745.044.7
M9.0*1.257.807.9127.647M10.0*0.59.509.5209.4001 3/4 UNC539.5039.82738.9641 1/2 UNF1236.0036.27135.814
M10.0*1.58.508.7768.376M11.0*1.010.0010.1539.9172UNC4 1/245.2045.59334.679
M11.0*1.59.509.6769.376M11.0*0.7510.3010.37810.188
M12.0*1.7510.3010.44110.106M12.0*1.510.5010.67610.376
M14.0*2.012.0012.21011.836M12.0*1.2510.8010.91210.647
M16.0*2.014.0014.21013.835M12.0*1.011.0011.15310.917
M18.0*2.515.5015.74415.294M14.0*1.512.5012.67612.376上限下限使用绞刀不使用绞刀
M20.0*2.517.517.74417.294M14.0*1.013.0013.15312.917SM1/6-801.301.341.181/16PT286.16.26.2446.384
M22.0*2.519.519.74419.294M15.0*1.513.5013.67613.376SM5/64-641.601.681.471/8PT288.18.28.2498.388
M24.0*3.021.021.25220.752M15.0*1.014.0014.15313.917SM3/32-1002.152.182.051/4PT1910.711.010.96211.174美制粗牙（UNC）美制细牙（UNF）
2级螺纹内径英制粗牙（W）
螺纹下孔直径下孔径称呼尺寸下孔径称呼尺寸下孔径2级螺纹内径称呼尺寸下孔径公制粗牙（M）公制细牙（MF）
2级螺纹内径称呼尺寸下孔径称呼尺寸下孔径
称呼尺寸下孔径有效螺纹部的最小内径基准位置的最小内径针车牙(SM)
规格下孔径下孔径管用螺纹PT(Rc)M27.0*3.024.024.25223.752M16.0*1.514.5014.67614.376SM3/32-561.902.031.793/8PT1914.214.514.44814.658
M30.0*3.526.026.77126.211M16.0*1.015.0015.15314.917SM1/8-442.552.732.431/2PT1417.618.017.97918.263
M33.0*3.529.529.77129.211M17.0*1.515.5015.67615.376SM1/8-402.502.682.353/4PT1423.023.523.37823.663
M36.0*4.032.032.27031.670M17.0*1.016.0016.15315.917SM9/64-402.903.082.751PT1129.029.529.45829.822
M39.0*4.035.035.27034.670M18.0*2.016.0016.21015.835SM11/64-403.703.873.541 1/4PT1137.538.037.97638.339
M42.0*4.537.537.79937.129M18.0*1.516.5016.67616.376SM3/16-323.954.143.731 1/2PT1143.444.043.86944.232
M45.0*4.540.540.79940.129M18.0*1.017.0017.15316.917SM3/16-283.804.063.582PT1154.955.555.41255.844
M20.0*2.018.0018.21017.835SM7/32-324.704.944.53
M20.0*1.518.5018.67618.376SM15/64-285.005.254.77
M20.0*1.019.0019.15318.917SM1/4-405.705.865.53
M22.0*2.020.0020.21019.835SM1/4-285.405.645.17
上限下限M22.0*1.520.5020.67620.376SM1/4-245.255.534.98
M1*0.250.900.920.86M22.0*1.021.0021.15320.917
M1.1*0.251.001.020.96M24.0*2.022.0022.21021.835
M1.2*0.251.101.121.06M24.0*1.522.5022.67622.376
M1.4*0.301.251.301.24M24.0*1.023.0023.15322.917
M1.6*0.361.451.491.41M25.0*2.023.0023.21022.835上限下限上限下限上限下限
M1.7*0.351.551.591.51M25.0*1.523.5023.67623.376NO.1 -641.701.731.641/16PF286.76.8436.5611/16PS286.56.6326.490
M1.8*0.351.651.691.61M25.0*1.024.0024.15323.917NO.2 -562.002.041.941/8PF288.78.8488.5661/8PS288.58.6378.495
M2*0.41.801.871.78M26.0*1.524.5024.67624.316NO.3 -482.252.342.231/4PF1911.711.89011.4451/4PS1911.411.54911.341
M2.2*0.452.002.051.96M27.0*2.025.0025.21024.835NO.4 -402.552.642.503/8PF1915.215.39514.9503/8PS1915.015.05414.846
M2.3*0.42.102.172.08M27.0*1.525.5025.67625.376NO.5 -402.902.972.831/2PF1419.019.17218.6311/2PS1418.518.77318.489
M2.5*0.452.302.352.26M27.0*1.026.0026.15325.917NO.6 -323.153.253.085/8PF1421.021.12820.5873/4PS1424.024.25923.975
M2.6*0.452.402.452.36M28.0*2.026.0026.21025.835NO.8 -323.803.913.743/4PF1424.524.65824.1171PS1130.230.47130.111
M3*0.52.752.842.73M28.0*1.526.5026.67626.376NO.10 -244.354.484.257/8PF1428.228.41827.8771 1/4PS1138.839.13238.772
M3.5*0.63.203.313.18M28.0*1.027.0027.15326.917NO.12 -245.005.144.911PF1130.530.93130.2911 1/2PS1144.845.02544.665
M4*0.73.653.773.62M30.0*3.027.0027.25226.7521/4 -205.755.945.661 1/8PF1135.235.57934.9392PS1156.556.83656.476
M4.5*0.754.154.264.09M30.0*2.028.0028.21027.8355/16 -187.307.487.171 1/4PF1139.239.59238.952
M5*0.84.604.744.57M30.0*1.528.5028.67628.3763/8 -168.809.018.671 1/2PF1145.045.48544.845
M6.0*1.05.505.685.46M30.0*1.029.0029.15328.9177/16 -1410.3010.5210.131 3/4PF1151.051.42850.788
M7.0*1.06.506.686.46M32.0*2.030.0030.21029.8351/2 -1311.8012.0711.642PF1157.057.29656.656
M8.0*1.257.357.597.32M32.0*1.530.5030.67630.376
M9.0*1.258.408.598.32M33.0*3.030.0030.25229.752
M10.0*1.59.259.519.19M33.0*2.031.0031.21030.833
M12.0*1.7511.1011.4311.05M33.0*1.531.5031.67631.376
M14.0*2.013.1013.2512.90M35.0*1.533.5033.67633.376上限下限规格下孔径无屑丝攻公制粗牙(M)
管用螺纹PF(G)无屑丝攻美制粗牙（UNC）
规格下孔径下孔径下孔径
无屑丝攻美制粗牙（UNF）
规格下孔径称呼尺寸
下孔径美制管用螺纹
下孔径( )内为英制尺寸
NPT
NPS称呼尺寸下孔径A、B级内螺纹内径管用螺纹PS(Rp)
称呼尺寸下孔径A、B级内螺纹内径
