攻牙前钻孔尺寸

螺丝攻牙孔径对照表

螺丝攻牙钻孔径对照表 美制（粗）挤牙丝攻钻孔径 公制挤牙丝攻钻孔径 美制细牙螺纹 公制细牙螺纹 规格精度max min 规格精度max min 2-56UNC RH4 2.02 1.96M1.0 0.25RH40.920.90最大最小最大最小3-48RH4 2.32 2.25M1.1 0.25RH4 1.02 1.00螺丝牙外径 M7.0 0.50 6.50 6.550 6.4004-40RH5 2.60 2.52M1.2 0.25RH4 1.12 1.10No.0-80（1.524） 1.25 1.305 1.182M8.0 1.00 7.007.153 6.9175-40RH5 2.93 2.86M1.4 0.30RH4 1.294 1.270No.1-72（1.854） 1.55 1.612 1.474M 8.0 0.757.307.3787.1886-32RH5 3.17 3.09M1.6 0.35RH4 1.45 1.40No.2-64（2.184） 1.85 1.912 1.756M8.0 0.507.507.5207.4008-32RH6 3.83 3.75M1.7 0.35RH4 1.58 1.54No.3-56（2.515） 2.10 2.197 2.025M 9.0 1.008.008.1537.91710-24RH6 4.35 4.26M2.0 0.40RH4 1.85 1.81No.4-48（2.845） 2.40 2.458 2.271M9.0 0.758.308.3788.18812-24RH6 5.01 4.92M2.3 0.40RH4 2.15 2.11No.5-44（3.175） 2.70 2.740 2.551M10.0 1.258.808.9128.6471/4-20RH6 5.76 5.66M2.5 0.45RH4 2.33 2.28No.6-40（3.505） 2.90 3.022 2.820M10.0 1.009.009.1538.9175/16-18RH77.297.18M2.6 0.45RH4 2.43 2.38No.8-36（4.166） 3.50 3.606 3.404M10.0 0.759.309.3789.1883/8-16RH78.788.66M3.0 0.50RH5 2.81 2.76No.10-32（4.826） 4.10 4.165 3.963M10.0 0.509.509.5209.4007/16-14RH710.2510.11M3.5 0.60RH5 3.26 3.20No.12-28（5.486） 4.60 4.724 4.496M11.0 1.0010.0010.1539.9171/2-13RH811.7811.62M4.0 0.70RH6 3.70 3.651/4-28 5.50 5.588 5.360M11.0 0.7510.3010.37810.1889/16-12RH1013.2713.14M5.0 0.80RH6 4.66 4.595/16-24 6.907.035 6.782M12.0 1.5010.5010.67610.3765/8-11RH1114.7614.62M6.0 1.00RH7 5.57 5.483/8-248.508.6368.382M12.0 1.2510.8010.91210.6473/4-10RH1217.8817.67M7.0 1.00RH7 6.57 6.487/16-209.9010.0339.729M12.0 1.0011.0011.15310.9177/8-9RH1220.8520.68M8.0 1.00RH77.577.481/2-2011.5011.60711.329M12.0 0.5011.5011.52011.4001-8 RH13 23.84 23.65 M8.0 1.25RH77.417.349/16-1812.9013.08112.751M14.0 1.5012.5012.67612.376M10 1.00RH79.579.485/8-1814.5014.68114.351M14.0 1.0013.0013.15312.917美制（细）挤牙丝攻钻孔径 M10 1.25RH79.419.343/4-1617.5017.67817.323M15.0 1.5013.5013.67613.376规格精度max min M10 1.50RH79.289.187/8-1420.5020.67520.270M15.0 1.0014.0014.15313.9172-64UNF RH3 2.04 1.98M12 1.00RH711.5711.181-12 23.3023.57123.114M16.0 1.5014.5014.67614.3763-56RH4 2.35 2.29M12 1.25RH711.4111.051-1/8-1226.5026.74626.289M16.0 1.0015.0015.15314.9174-48RH4 2.64 2.57M12 1.50RH711.2811.481-1/4-1229.6029.92129.464M17.0 1.5015.5015.67615.3765-44RH4 2.95 2.88M12 1.75RH811.1511.341-3/8-1232.8033.09632.639M17.0 1.0016.0016.15315.9176-40RH5 3.26 3.19M14 1.50RH913.3013.211-1/2-12 36.00 36.271 35.814 M18.0 2.0016.0016.21015.8358-36RH5 3.88 3.80M14 2.00RH1013.0412.92M18.0 1.5016.5016.67616.37610-32RH5 4.48 4.41M16 1.50RH915.3015.21M18.0 1.0017.0017.15316.91712-28RH5 5.08 5.00M16 2.00RH1015.0414.92M20.0 2.0018.0018.21017.8351/4-28RH5 5.93 5.86M18 1.5RH1017.3117.22M20.0 1.5018.5018.67618.3765/16-24RH67.467.38M18 2.5RH1116.7816.63M20.0 1.0019.0019.15318.9173/8-24RH69.058.96M20 1.5RH1019.3119.22M22.0 2.0020.0020.21019.8357/16-20RH710.5410.44M20 2.5 RH11 18.78 18.63 M22.0 1.5020.5020.67620.3761/2-20RH712.1212.02M22.0 1.0021.0021.15320.9179/16-18RH913.6613.55最大最小M24.0 2.0022.0022.21021.8355/8-18RH915.2515.14螺丝牙外径 M24.0 1.5022.5022.67622.3763/4-16RH1018.3218.22 1. 外径-牙距?0.45=下孔＜D-P?0.45＞No.1-64（1.854） 1.55 1.582 1.425M24.0 1.0023.0023.15322.9177/8-14RH1121.3821.27 2. Dn=D-0.2P-0.00403?P?f1+0.0127?n No.2-56（2.184） 1.80 1.871 1.695M25.0 2.0023.0023.21022.8351-12RH12 24.4124.28 ＜例＞M3?0.5RH6 2级母螺纹攻牙 咬合率90%No.3-48（2.515） 2.10 2.146 1.941M25.0 1.5023.5023.67623.376Dn=3-0.2?0.5-0.00403?0.5?90+0.0127?6No.4-40（2.845） 2.30 2.385 2.157M25.0 1.0024.0024.15323.917 =2.80 No.5-40（3.175） 2.60 2.697 2.487M26.0 1.5024.5024.67624.376山数 山数 Dn=下孔径 D=基准外径 P=牙距No.6-32（3.505） 2.80 2.895 2.642M27.0 2.0025.0025.21024.835每25.4mm 每25.4mm f1=咬合率 n=RH 精度 No.8-32（4.166） 3.40 3.530 3.302M27.0 1.5025.5025.67625.3761000.254012 2.1167No.10-24（4.826） 3.90 3.962 3.683M27.0 1.0026.0026.15325.917800.317511 2.3091No.12-24（5.486） 4.50 4.597 4.344M28.0 2.0026.0026.21025.835720.352810 2.54001/4-20 5.10 5.257 4.979M28.0 1.5026.5026.67626.376640.39699 2.82225/16-18 6.60 6.731 6.401M28.0 1.0027.0027.15326.917600.42338 3.17503/8-168.008.1537.798M30.0 3.0027.0027.25226.752560.45367 3.62867/16-149.409.5509.144M30.0 2.0028.0028.21027.835480.52926 4.23331/2-1310.9011.02310.592M30.0 1.5028.5028.67628.376440.57735 5.0800规格吋 mm 9/16-1212.2012.46611.989M30.0 1.0029.0029.15328.917400.63504 1/2 5.6444 No. 0 0.0600 1.5245/8-1113.6013.86813.386M32.0 2.0030.0030.21029.835360.70564 6.350010.0730 1.8543/4-1016.6016.84016.307M32.0 1.5030.5030.67630.376320.79383 1/27.257120.0860 2.1847/8-919.6019.76119.177M33.0 3.0030.0030.25229.752280.90713 1/47.815430.0990 2.5151-8 22.3022.60621.971M33.0 2.0031.0031.21030.83524 1.058338.466740.1120 2.8451-1/8-725.0025.34924.638M33.0 1.5031.5031.67631.37620 1.27002 7/88.834850.1250 3.1751-1/4-728.2028.52427.813M35.0 1.5033.5033.67633.37618 1.41112 3/49.236460.1380 3.5051-3/8-630.8031.11530.353M36.0 3.0033.0033.25232.75216 1.58752 5/89.676280.1640 4.1661-1/2-634.0034.29033.528M36.0 2.0034.0034.21033.83514 1.81432 1/2 10.1600 100.1900 4.8261-3/4-539.5039.82738.964M36.0 1.50 34.50 34.67634.376 13 1.9538 12 0.2160 5.486 2-4-1/2 45.20 45.593 44.679 美制螺丝外径公厘（mm ）换算表 美制粗牙螺纹 规格标准径2级牙钻孔径NRT 下孔径计算式 2级牙钻孔径规格 标准径 2级牙钻孔径牙距mm 牙距mm 规格 标准径 山数节距换算表

螺丝攻牙钻孔径和滚丝径对照表

螺丝攻牙钻孔径和滚丝径对照表

螺丝攻牙钻孔径和滚丝径对照表 公制粗螺纹美制粗螺纹 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 M1.0×0.25 0.75 0.785 0.729 NO.1-64(1.854) 1.55 1.582 1.425 M1.1×0.25 0.85 0.885 0.829 NO.2-56(2.184) 1.80 1.871 1.695 M1.2×0.25 0.95 0.985 0.985 NO.3-48(2.515) 2.10 2.146 1.941 M1.4×0.3 1.10 1.142 1.075 NO.4-40(2.845) 2.30 2.385 2.157 M1.6×0.35 1.25 1.321 1.221 NO.5-40(3.175) 2.60 2.697 2.487 M1.7×0.35 1.35 1.421 1.321 NO.6-32(3.505) 2.80 2.895 2.642 M1.8×0.35 1.45 1.521 1.421 NO8-32(4.166) 3.40 3.53 3.302 M2.0×0.4 1.60 1.679 1.567 NO.10-24(4.826) 3.90 3.962 3.683 M2.2×0.45 1.75 1.838 1.713 NO.12-24(5.486) 4.50 4.597 4.344

M2.3×0.4 1.90 1.979 1.867 1/4-20 5.10 5.257 4.979 M2.5×0.45 2.10 2.138 2.013 5/16-18 6.60 6.731 6.401 M2.6×0.45 2.20 2.238 2.113 3/8-16 8.00 8.153 7.798 M3.0×0.5 2.50 2.599 2.459 7/16-14 9.40 9.55 9.144 M3.0×0.6 2.40 2.440 2.280 1/2-13 10.80 11.023 10.592 M3.5×0.6 2.90 3.010 2.850 9/16-12 12.20 12.446 11.989 M4.0×0.7 3.30 3.422 3.242 5/8-11 13.60 12.868 13.386 M4.0×0.75 3.25 3.326 3.106 3/4-10 16.50 18.840 16.307 M4.5×0.75 3.80 3.878 3.688 7/8-9 19.50 19.761 19.177 M5.0×0.8 4.20 4.334 4.134 1 22.20 22.606 21.971 M5.0×0.9 4.10 4.170 3.930 1-1/8-7 25.00 25.349 24.638 M6.0×1.0 5.00 5.153 4.917 1-1/4-7 28.20 28.524 27.813 M7.0×1.0 6.00 6.153 5.917 1-3/8-6 30.80 31.115 30.353