攻牙下孔径对照表.doc

建議下孔徑 Recommended Tap Drill Sizes 公製牙Nominal SizeDrill Size(mm)D1(mm) Nominal SizeDrill Size(mm)D1(mm)Max.Min.Max.Min.M1 x0.25M1 x0.2M1.1 x0.25M1.1 x0.2M1.2 x0.250.750.800.850.900.950.785(0.821)0.885(0.921)0.9850.729(0.783)0.829(0.883)0.929M6 x0.75*M6 x0.5M7 x1M7 x0.75*M7 x0.55.35.56.06.36.55.3785.5506.1536.3786.5505.1185.4005.9176.1886.400M1.2 x0.2M1.4 x0.3M1.4 x0.2M1.6 x0.35M1.6 x0.21.001.101.201.251.40(1.021)1.142(1.221)1.321(1.421)(0.983)1.075(1.183)1.221(1.383)M8 x1.25M8 x1M8 x0.75*M8 x0.5M9 x1.256.87.07.37.57.86.9127.1537.3787.5207.9126.6476.9177.1887.4007.647M1.7 x0.35*M1.7 x0.2M1.8 x0.35M1.8 x0.2M2 x0.41.351.451.451.601.601.4211.5001.521(1.621)1.6791.3211.4601.421(1.583)1.567M9 x1M9 x0.75M10 x1.5M10 x1.25M10 x18.08.38.58.89.08.1538.3788.6768.9129.1537.9178.1888.3768.6478.917M2 x0.25M2.2 x0.45M2.2 x0.25M2.3 x0.4*M2.3 x0.251.751.751.951.902.05(1.785)1.838(1.985)1.9792.061(1.729)1.713(1.929)1.8672.001M10 x0.75*M10x0.5M11 x1.5M11 x1M11 x0.759.39.59.510.010.39.3789.5209.67610.15310.3789.1889.4009.3769.91710.188M2.5 x0.45M2.5 x0.35M2.6 x0.45*M2.6 x0.35M3 x0.52.102.202.202.202.502.1382.2212.2382.2462.5992.0132.1212.1132.1892.459M12 x1.75M12 x1.5M12 x1.25M12 x1*M12x0.510.310.510.811.011.510.44110.67610.91211.15311.52010.10610.37610.64710.91711.400M3 x0.35M3.5 x0.6M3 x0.35M4 x0.7M4 x0.52.702.903.203.303.502.7213.0103.2213.4223.5992.6212.8503.1213.2423.459M14 x2M14 x1.5M14 x1M15 x1.5M15 x112.012.513.013.514.012.21012.67613.15313.67614.15311.83512.37612.91713.37613.917M4.5 x0.75M4.5 x0.5M5 x0.8M5 x0.5M6 x13.804.004.204.505.003.8784.0994.3344.5995.1533.6883.9594.1344.4594.917M16 x2M16 x1.5M16 x1M17 x1.5M17 x114.014.515.015.516.014.21014.67615.15315.67616.15313.83514.37614.91715.37615.917 The reccommended tap drill sizes indicated above are for JIS Class 2 Metric threads. D1： Minor diameter of JIS Class 2 internal thread. But, the minor diameters D1 shown in ( ) are of JIS Class I internal threads because their nominal sizes are not specified in JIS Class 2. * Marked sizes have been eliminated from JIS since 1969. 公製牙Nominal SizeDrill Size(mm)D1(mm) Nominal SizeDrill Size(mm)D1(mm)Max.Min.Max.Min.M18 x2.5M18 x2M18 x1.5M18 x1M20 x2.515.516.016.517.017.515.74416.21016.67617.15317.74415.29415.83516.37616.91717.294M33 x3M33 x2M33 x1.5M35 x1.5M36 x430.031.031.533.532.030.25231.21031.67633.67632.27029.75230.83531.37633.37631.670M20 x2M20 x1.5M20 x1M22 x2.5M22 x218.018.519.019.520.018.21018.67619.15319.74420.21017.83518.37618.91719.29419.835M36 x3M36 x2M36 x1.5M38 x1.5M39 x433.034.034.536.535.033.25234.21034.67636.67635.27032.75233.83534.37636.37634.670M22 x1.5M22 x1M24 x3M24 x2M24 x1.520.521.021.022.022.520.67621.15321.25222.21022.67620.37620.91720.75221.83522.376M39 x3M39 x2M39 x1.5M40 x3M40 x236.037.037.537.038.036.25237.21037.67637.25238.21035.75236.83537.37636.75237.835M24 x1M25 x2M25 x1.5M25 x1M26 x1.523.023.023.524.024.023.15323.21023.67624.15324.67622.91722.83523.37623.91724.376M40 x1.5M42 x4.5M42 x4M42 x3M42 x238.537.538.039.040.038.67637.79938.27039.25240.21038.37637.12937.67038.75239.835M27 x3M27 x2M27 x1.5M27 x1M28 x224.025.025.526.026.024.25225.21025.67626.15328.21023.75224.83525.37625.91725.835M42 x1.5M45 x4.5M45 x4M45 x3M45 x240.540.541.042.043.040.67640.79941.27042.25243.21040.37640.12940.67041.75242.835M28 x1.5M28 x1M30 x3.5M30 x3M30 x226.527.026.527.028.026.67627.15316.77127.25228.21026.37626.91726.21126.75227.835M45 x1.5M48 x5M48 x4M48 x3M48 x243.543.044.045.046.043.67643.29744.27045.25246.21043.37642.58743.67044.75245.835M30 x1.5M30 x1M32 x2M32 x1.5M33 x3.528.529.030.030.529.528.67629.15330.21030.67629.77128.37628.91729.83530.37629.211M48 x1.5M50 x3M50 x2M50 x1.5 46.547.048.048.5 46.67647.25248.21048.676 46.37646.75247.83548.376 The reccommended tap drill sizes indicated above are for JIS Class 2 Metric threads. D1： Minor diameter of JIS Class 2 internal thread. But, the minor diameters D1 shown in ( ) are of JIS Class I internal threads because their nominal sizes are not specified in JIS Class 2. 美製牙 UNC，UNFNominal SizeDrill Size(mm)D1(mm) Nominal SizeDrill Size(mm)D1(mm)Max.Min.Max.Min.No. 0-80UNFNo. 1-64UNCNo. 1-72UNFNo. 2-56UNCNo. 2-64UNF1.251.551.551.801.851.3051.5821.6121.8711.9121.1821.4251.4741.6951.756 5/8-24UNEF 3/4-10UNC 3/4-16UNF 3/4-20UNEF 7/8- 9UNC14.816.517.517.819.514.98616.84017.67817.95819.76114.73216.30717.32317.67819.177No. 3-48UNCNo. 3-56UNFNo. 4-40UNCNo. 4-48UNFNo. 5-40UNC2.12.12.32.42.62.1462.1972.3852.4582.6971.9412.0252.1572.2712.487 7/8-14UNF 7/8-20UNEF1 - 8UNC1 -12UNF1 -20UNEF20.521.022.223.224.020.67521.13322.60623.57124.30820.27020.85321.97123.11424.028No. 5-44UNFNo. 6-32UNCNo. 6-40UNFNo. 8-32UNCNo. 8-36UNF2.72.82.93.43.52.7402.8953.0223.5303.6062.5512.6422.8203.3023.40411/8- 7UNC11/8-12UNF11/8-18UNEF11/8- 8UN11/4- 7UNC25.026.527.225.528.225.34926.74627.38125.78128.52424.63826.28927.05125.14627.813No.10-24UNCNo.10-32UNFNo.12-24UNCNo.12-28UNFNo.12-32UNEF3.94.14.54.64.73.9624.1654.5974.7244.8263.6833.9634.3444.4964.62311/4-12UNF11/4-18UNEF11/4- 8UN13/8- 6UNC13/8-12UNF29.530.228.530.832.829.92130.55628.95631.11533.09629.46430.22628.32130.35332.6391/ 4-20UNC1/ 4-28UNF1/ 4-32UNEF5/16-18UNC5/16-24UNF5.15.55.66.66.95.2575.5885.6906.7317.0354.9795.3605.4866.4016.78213/8-18UNEF13/8- 8UN11/2- 6UNC11/2-12UNF11/2-18UNEF33.531.834.036.036.533.73132.13134.29036.27136.88133.40131.49633.52835.81436.5765/16-32UNEF3/ 8-16UNC3/ 8-24UNF3/ 8-32UNEF7/16-14UNC7.18.08.58.79.47.2648.1538.6368.8659.5507.0877.7988.3828.6619.14411/2- 8UN15/8-18UNEF15/8- 8UN15/8-12UN13/4- 5UNC35.039.838.239.239.535.30640.08138.48139.44639.82734.67139.75137.84638.98938.9647/16-20UNF7/16-28UNEF1/ 2-13UNC1/ 2-20UNF1/ 2-28UNEF9.910.210.811.511.810.03310.33811.02311.60711.9389.72910.13510.59211.32911.70913/4- 8UN13/4-12UN2 -4 1/2UNC2 - 8UN2 -12UN41.242.245.247.848.541.65642.62145.59348.00648.97141.02142.16444.67947.37148.5149/16-12UNC9/16-18UNF9/16-24UNEF5/ 8-11UNC5/ 8-18UNF12.212.913.213.614.512.44613.08113.38613.86814.68111.98912.75113.13213.38614.351 The recommended tap drill sizes indicated above are for JIS Class 2B UNC & UNF threads, and ANSI BI . Ia Class 2B UNEF & UN threads. D1：Minor diameter of internal thread. For UNC and UNF threads, according to JIS Class 2B; For UNEF and UN threads, according to ANSI BI . Ia, Class 2B. 英製牙 BSWNominal SizeTap Drill Size(mm) Nominal SizeTap Drill Size(mm)ABAB* 1/ 8 W 40* 5/32 W 32* 3/16 W 242.653.253.752.603.203.70 7/ 8 W 91 W 81 1/ 8 W 719.522.425.019.322.024.8 1/ 4 W 20 5/16 W 18 3/ 8 W 165.16.68.05.06.57.91 1/ 4 W 71 3/ 8 W 61 1/ 2 W 628.330.533.828.030.333.5 7/16 W 14 1/ 2 W 12 9/16 W 129.410.712.39.310.512.01 5/ 8 W 51 3/ 4 W 51 7/ 8 W 4 1/236.039.241.835.739.041.5 5/ 8 W 1113.713.52 W 4 1/245.044.7 3/ 4 W 1016.716.5 The recommended tap drill sizes indicated above are for JIS Class 2 Whitworth threads. Generally, the tap drill sizes in column A are used for producing holes; When holes tend to be cut oversized, the tap drill sizes in column B should be selected. These tap drill sizes are in accordance with JIS B 1004-1966, while the nominal sizes with a * mark are in accordance with BSW (Please refer to page 135). 管牙PT Pipe ThreadNominal SizeTap Drill SizeInternal Thread MinorDia. on Min. Lengthof Useful Thread(mm)Internal Thread MinorDia. on Min. GaugeLength(mm)With ReamingBefore Tapping(mm)Without ReamingBefore Tapping(mm)*PT 1/16-28 PT 1/ 8-28 PT 1/ 4-196.18.110.76.28.211.06.2448.24910.9626.3848.38811.174 PT 3/ 8-19 PT 1/ 2-14 PT 3/ 4-1414.217.623.014.518.023.514.44817.97923.37814.65818.26323.663 PT -11 PT1 1/4-11 PT1 1/2-1129.037.543.429.538.044.029.45937.97643.86929.82238.33944.232 PT2 -1154.955.555.41255.844 * PTI / 16 is according to JIS B 0203-1982 Rc internal thread.PS Pipe Thread PF Pipe ThreadNominal SizeDrill Size(mm)D1 (mm)Nominal SizeDrill Size(mm)D1 (mm)Max.Min.Max.Min.*PS1/16-28PS 1/ 8-28PS 1/ 4-196.58.511.46.6328.63711.5496.4908.49511.341*PF1/16-28PF 1/ 8-28PF 1/ 4-196.78.711.76.8438.84811.8906.5618.56611.445PS 3/ 8-19PS 1/ 2-14PS 3/ 4-1415.018.524.015.05418.77324.25914.84618.48923.975PF 3/ 8-19PF 1/ 2-14PF 3/ 4-1415.219.024.515.39519.17224.65814.95018.63124.117PS1 -11PS1 1/4 -11PS1 1/2 -1130.238.844.830.47139.13245.02530.11138.77244.665PF1 -11PF1 1/4 -11PF1 1/2 -1130.539.245.030.93139.59245.48530.29138.95244.845PS2 -1156.556.83656.476PF2 -1157.057.29656.656 * PSI/16 is according to JIS B 0203-1982 Rp internal thread. * PFI/16 is according to JIS B 0203-1982 G internal thread.The reccommended tap drill sizes indicated above are for JIS Class A PF threads. 管牙American standard Pipe Thread *1 Nominal SizeTap Drill SizeNPTNPSCWith Reaming TappingWithout Reaming Tappingmminchmminchmminch 1/16-27 1/ 8-27 1/ 4-185.948.3310.720.2340.3280.4226.158.4311.130.2420.3320.4386.358.7411.130.2500.3440.438 3/ 8-18 1/ 2-14 3/ 4-1414.2717.4822.630.5620.6880.89114.2717.8623.010.5620.7030.90614.6818.2623.420.5780.7190.922 1 -14 1/2 1 1/4 -11 1/2 1 1/2 -11 1/228.5837.3143.261.1251.4691.70328.9837.6943.661.1411.4841.71929.3638.1044.451.1561.5001.750 2 -11 1/2 2 1/2 2-855.1765.482.1722.57855.5866.272.1882.60956.3667.462.2192.656 *1The above drill sizes are according to ANSI/ASME BI.20.1-1983 Pipe Threads, General Purpose (inch) (partial listing).Dryseal American standard Pipe Thread *2 Nominal SizeTap Drill SizeNPTFNPSFWith Reaming TappingWithout Reaming Tappingmminchmminchmminch 1/16-27 1/ 8-27 1/ 4-185.948.3310.720.2340.3280.4226.158.4311.130.2420.3320.4386.258.6111.130.2460.3390.438 3/ 8-18 1/ 2-14 3/ 4-1414.2717.4822.630.5620.6880.89114.2717.8623.010.5620.7030.90614.6817.8623.420.5780.7030.922 1 -11 1/2 1 1/4 -11 1/2 1 1/2 -11 1/228.5837.3143.261.1251.4691.70328.9837.6943.661.1411.4841.71929.36 1.156 2 -11 1/2 2 1/2 2-855.1765.482.1722.57855.5866.272.1882.609 *2The above drill sizes are according to ANSI/ASME BI.20.3-1976 Pipe Threads, (inch) (partial listing). For Threads Using with Helical Coil Wire insertsMetric ThreadNominal SizeTap Drill Size(mm)Recommended Hole Size (mm)Max.Min. M 30.5 M 40.7 M 50.8 M 61 M 81.253.14.25.26.38.43.204.305.336.428