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 纹规格M1.0*0.25M1.1*0.25M1.2*0.25M1.4*0.3M1.6*0.35M1.7*0.35M1.8*0.35M2.0*0.4M2.2*0.45M2.3*0.4M2.5*0.45M2.6*0.45M3.0*0.5M3.0*0.6M3.5*0.6M4.0*0.7M4.0*0.75M4.5*0.75M5.0*0.8M5.0*0.9M6.0*1.0M7.0*1.0M8.0*1.25M9.0*1.25M10*1.5M11*1.5M12*1.75M14*2.0M16*2.0M18*2.5M20*2.5M22*2.5M24*3.0M27*3.0M30*3.5标准径0.750.850.951.101.251.351.451.601.751.902.102.202.502.402.903.303.253.804.204.105.006.006.807.808.509.5010.3012.0014.0015.5017.5019.5021.0024.0026.502级牙钻孔径最大0.7850.8850.9851.1421.3211.4211.5211.6791.8381.9792.1382.2382.5992.4403.0103.4223.3263.8784.3344.1705.1536.1536.9127.9128.6769.67610.44112.21014.21015.74417.74419.74421.25224.25226.771最小0.7290.8290.9291.0751.2211.3211.4211.5671.7131.8672.0132.1132.4592.2802.8503.2423.1063.6884.1343.9304.9175.9176.6477.6478.3769.37610.10611.83513.83515.29417.29419.29420.75223.75226.211M12*1.0M12*0.5M14*1.5M14*1.0M15*1.5M15*1.0M16*1.5M16*1.0M17*1.5M17*1.0M18*2.0M18*1.5M18*1.0M20*2.0M20*1.5M20*1.0M22*2.0M22*1.5M22*1.0M24*2.0M24*1.5M24*1.0M25*2.0M25*1.5M25*1.0M26*1.5M27*2.0M27*1.5M27*1.0M28*2.0M28*1.5M28*1.0M30*3.0M30*2.0M30*1.5M30*1.0M32*2.0M32*1.5M33*3.0M33*2.0M33*1.5M35*1.5M36*3.0M36*2.0M36*1.5公 制 细 螺 纹规格标准径11.0011.5012.5013.0013.5014.0014.5015.0015.5016.0016.0016.5017.0018.0018.5019.0020.0020.5021.0022.0022.5023.0023.0023.5024.0024.5025.0025.5026.0026.0026.5027.0027.0028.0028.5029.0030.0030.5030.0031.0031.5033.5033.0034.0034.502级牙钻孔径最大11.15311.52012.67613.15313.67614.15314.67615.15315.67616.15316.21016.67617.15318.21018.67619.15320.21020.67621.15322.21022.67623.15323.21023.67624.15324.67625.21025.67626.15326.21026.67627.15327.25228.21028.67629.15330.21030.67630.25231.21031.67633.67633.25234.21034.676最小10.91711.40012.37612.91713.37613.91714.37614.91715.37615.91715.83516.37616.91717.83518.37618.91719.83520.37620.91721.83522.37622.91722.83523.37623.91724.37624.83525.37625.91725.83526.37626.91726.75227.83528.37628.91729.83530.37629.75230.83531.37633.37632.75233.83534.376公 制 迫 牙 丝 攻 钻 孔 径规 格M1.0*0.25M1.1*0.25M1.2*0.25M1.4*0.3M1.6*0.35M1.7*0.35M1.8*0.35M2*0.4M2.2*0.45M2.3*0.4M2.5*0.45M2.6*0.45M3.0*0.5M3.5*0.6M4.0*0.7M5.0*0.8M6.0*1.0M7.0*1.0M8.0*1.25M10*1.5M10*1.25M12*1.75M12*1.25精 度 等 级G4-G6G7-G8G90.860.880.960.981.061.081.241.251.411.431.511.531.611.631.781.801.951.982.082.102.252.282.352.382.732.753.173.203.623.653.694.564.604.645.455.505.556.456.506.557.317.387.449.189.259.329.319.389.4411.0411.1211.2111.3111.3811.44美 制 迫 牙 丝 攻 钻 孔 径规 格No.2-56UNCNo.3-48No.4-40No.5-40No.6-32No.8-32No.10-24No.12-241/4 -205/16 -183/8 -167/16 -141/2 -13No.2-64UNFNo.3-56No.4-48No.5-44No.6-40No.8-36No.10-32No.12-281/4 -285/16 -243/8 -247/16 -201/2 -20G4-G61.942.232.502.833.073.734.244.90精 度 等 级G9G7-G8英 制 螺 纹规 格W1/8 -40W5/32 -32W3/16 -24W1/4 -20W5/16 -18W3/8 -16W7/16 -14W1/2 -12W9/16 -12W5/8 -11W3/4 -10W7/8 -9W1 -8W1-1/8-7W1-1/4-7钻孔径硬 材2.653.253.755.106.608.009.4010.7012.3013.7016.7019.5022.4025.0028.30软 材2.603.203.705.006.507.909.3010.5012.0013.5016.5019.3022.0024.8028.003.774.304.965.727.248.7410.2011.278.8110.3011.821.972.272.562.863.163.784.394.995.857.36针 车 用 螺 纹4.435.045.907.419.0010.4812.07规格SM1/8-40SM1/8-44SM9/64 -40SM11/64-40SM3/16 -32SM3/16 -28SM7/32 -32SM15/64-28SM1/4-40SM1/4-28SM9/32 -28SM11/32-28SM3/8-28SM7/16 -28SM7/16 -16SM1/2 -20SM9/16 -20滚造径2.735-2.6882.769-2.7223.128-3.0833.855-3.8054.205-4.1554.143-4.0935.003-4.9555.325-5.5705.890-5.7355.721-5.3666.508-6.6488.092-8.4328.880-8.01510.466-10.40110.037-9.96711.819-11.74913.400-13.425注：迫牙丝攻之钻孔径，在上表所列之数值，由于被加工 材料之材质、硬度、形状、尺寸等之影响，多少会有所变动，因此于参考上表之同时，亦请增减若干。
10.5412.13美 制 粗 螺 纹规格(UNC) (螺丝牙外径)英 制 管 螺 纹规格PS 1/16 - 28PS 1/8 - 28PS 1/4 - 19PS 3/8 - 19PS 1/2 - 14PS 3/4 - 14PS 1 - 11PS 1-1/4 - 11PS 1-1/2 - 11PS 2 - 11标准径6.508.5011.4015.0018.5024.0030.2038.8044.8056.50最小1.4251.6951.9412.1572.4872.6423.3023.6834.3444.9796.4017.7989.14410.59211.98913.38616.30719.17721.97124.63827.81330.35333.52838.96444.679最大6.6328.63711.54915.05418.77324.25930.47139.13245.02556.836钻孔径最小6.4908.49511.34114.84618.48923.97530.11138.77244.66556.476标准径2级牙钻孔径最大1.5821.8712.1462.3852.6972.8953.5303.9624.5975.2576.7318.1539.55011.02312.44612.86818.84019.76122.60625.34928.52431.11534.29039.82745.593公 制 细 螺 纹规格M1.0*0.2M1.1*0.2M1.2*0.2M1.4*0.2M1.6*0.2M1.7*0.2M1.8*0.2M2.0*0.25M2.2*0.25M2.3*0.25M2.5*0.35M2.6*0.35M3.0*0.35M3.5*0.35M4.0*0.5M4.5*0.5M5.0*0.5M5.5*0.5M6.0*0.75M6.0*0.5M7.0*0.75M7.0*0.5M8.0*1.0M8.0*0.75M8.0*0.5M9.0*1.0M9.0*0.75M10*1.25M10*1.0M10*0.75M10*0.5M11*1.0M11*0.75M12*1.5M12*1.25标准径0.800.901.001.201.401.451.601.751.952.052.202.202.703.203.504.004.505.005.305.506.306.507.007.307.508.008.308.809.009.309.5010.0010.3010.5010.802级牙钻孔径最大0.8210.9211.0211.2211.4211.5001.6211.7851.9852.0612.2212.2462.721最小0.7830.8830.9831.1831.3831.4601.5831.7291.9292.0012.1212.1862.621美 制 细 螺 纹规格(UNF) (螺丝牙外径)标准径2级牙钻孔径最大1.3051.6121.9122.1972.4582.7403.0223.6064.1654.7245.5887.0358.63610.03311.60713.08114.68117.67820.67523.57126.74629.92133.09636.271最小1.1821.4741.7562.0252.2712.5512.8203.4043.9634.4965.3606.7828.3829.72911.32912.75114.35117.32320.27023.11426.28929.46432.63935.8143.2213.1213.5993.4594.0993.9594.5994.4595.0994.9595.3785.1885.5505.4006.3786.1886.5506.4007.1536.9177.3787.1887.5207.4008.1537.9178.3788.1888.9128.4679.1538.9179.3789.1889.5209.40010.1539.91710.37810.18810.67610.37610.91210.647No.0-80(1.524)No.1-72(1.854)No.2-64(2.184)No.3-56(2.515)No.4-48(2.845)No.5-44(3.175)No.6-40(3.505)No.8-36(4.166)No.10-32(4.826)No.12-28(5.846)1/4 - 285/16 - 243/8 - 247/16 - 201/2 - 209/16 - 185/8 - 183/4 - 167/8 - 141 - 121-1/8 - 121-1/4 - 121-3/8 - 121-1/2 - 121.251.551.852.102.402.702.903.504.104.605.506.908.509.9011.5012.9014.5017.5020.5023.2026.5029.5032.8036.0No.1-64(1.854)No.2-56(2.184)No.3-48(2.515)No.4-40(2.845)No.5-40(3.175)No.6-32(3.505)No.8-32(4.166)No.10-24(4.826)No.12-24(5.486)1/4 - 205/16 - 183/8 - 167/16 - 141/2 - 139/16 - 125/8 - 113/4 - 107/8 - 91 - 81-1/8 - 71-1/4 - 71-3/8 - 61-1/2 - 61-3/4 - 52 - 4-1/21.551.802.102.302.602.803.403.904.505.106.608.009.4010.8012.2013.6016.5019.5022.2025.0028.2030.8034.0039.5045.20公 制 螺 纹规格M3*0.5M3.0*0.6M3.5*0.6M4.0*0.7M4.0*0.75M4.5*0.75M5.0*0.8M5.0*0.9M6.0*1.0M7.0*1.0M8.0*1.0M8.0*1.25滚造径2.63-2.602.56-2.533.06-3.033.49-3.453.45-3.413.96-3.924.43-4.384.36-4.315.30-5.256.30-6.257.28-7.237.12-7.07英 制 管 螺 纹规 格PT 1/16 -28PT 1/8 -28PT 1/4 -19PT 3/8 -19PT 1/2 -14PT 3/4 -14PT 1 -11PT 1-1/4 -11PT 1-1/2 -11PT 2 -11标准径使用绞刀时不用绞刀时有效牙部之长标准长度(最度(最小)中之小)中之母螺母螺牙内径牙内径6.108.1010.7014.2017.6023.0029.0037.5043.4054.906.208.2011.0014.5018.0023.5029.5038.0044.0055.506.2448.42910.96214.44817.97923.37829.45937.97643.86955.4126.3848.38811.17414.65818.26323.66329.82238.33944.23255.844英制电器螺纹规 格2BA3BA4BA5BA6BA钻 孔 径4.0-4.23.0-3.22.7-2.82.4-2.5美 制 特 细 螺 纹规格(UNEF)No.12 - 321/4 - 325/16 - 323/8 - 327/16 - 281/2 - 289/16 - 245/8 - 243/4 - 207/8 - 201 - 20标准径4.705.607.108.7010.2011.8013.2014.8017.8021.0024.002级牙钻孔径最大4.8265.6907.2648.86510.33811.93813.38614.98617.95821.13324.308最小4.6235.4867.0878.66110.13511.70913.13214.73217.67820.85324.028规格美 制 管 螺 纹钻 孔 径N P T使用绞刀时不用绞刀时N P S6.358.7411.1314.6818.2623.4229.3638.1044.4556.361/16 - 271/8 -271/4 -183/8 -181/2 -143/4 -141 -11-1/21-1/4 -11-1/21-1/2 -11-1/22 -11-1/26.108.3310.7214.2717.4822.6328.5837.3143.6655.586.258.4311.1314.2717.8623.0128.9837.6944.0455.96
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