最大最小最大最小G4-G6G7-G8G9G4-G6G7-G8硬 材软 材M1.0*0.25
0.750.7850.729M12*1.011.0011.15310.917M1.0*0.250.860.88No.2-56UNC 1.94 2.65 2.60M1.1*0.25
0.850.8850.829M12*0.511.5011.52011.400M1.1*0.250.960.98No.3-48 2.23 3.25 3.20M1.2*0.25
0.950.9850.929M14*1.512.5012.67612.376M1.2*0.25 1.06 1.08No.4-40 2.50 3.75 3.70M1.4*0.3
1.10 1.142 1.075M14*1.013.0013.1531
2.917M1.4*0.3 1.24 1.25No.5-40 2.83 5.10 5.00M1.6*0.35
1.25 1.321 1.221M15*1.513.5013.67613.376M1.6*0.35 1.41 1.43No.6-32 3.07 6.60 6.50M1.7*0.35
1.35 1.421 1.321M15*1.014.0014.15313.917M1.7*0.35 1.51 1.53No.8-32 3.73 3.778.007.90M1.8*0.35
1.45 1.521 1.421M16*1.514.5014.67614.376M1.8*0.35 1.61 1.63No.10-24 4.24 4.309.409.30M
2.0*0.4
1.60 1.679 1.567M16*1.015.0015.15314.917M2*0.4 1.78 1.80No.12-24 4.90 4.9610.7010.50M
2.2*0.45
1.75 1.838 1.713M17*1.515.5015.67615.376M
2.2*0.45 1.95 1.981/4 -20 5.7212.3012.00M2.3*0.4
1.90 1.979 1.867M17*1.016.0016.15315.917M
2.3*0.4 2.08 2.105/16 -187.241
3.7013.50M2.5*0.45
2.10 2.138 2.013M18*2.016.0016.21015.835M2.5*0.45 2.25 2.283/8 -168.7416.7016.50M2.6*0.45
2.20 2.238 2.113M18*1.516.5016.67616.376M2.6*0.45 2.35 2.387/16 -1410.2019.5019.30M
3.0*0.5
2.50 2.599 2.459M18*1.017.0017.15316.917M
3.0*0.5 2.73 2.751/2 -1311.2722.4022.00M3.0*0.6
2.40 2.440 2.280M20*2.018.0018.21017.835M
3.5*0.6 3.17 3.20No.2-64UNF 1.9725.002
4.80M3.5*0.6
2.90
3.010 2.850M20*1.518.5018.67618.376M
4.0*0.7 3.62 3.65 3.69No.3-56 2.2728.3028.00M4.0*0.7
3.30 3.422 3.242M20*1.019.0019.15318.917M5.0*0.8
4.56 4.60 4.64No.4-48 2.56M4.0*0.75
3.25 3.326 3.106M22*2.020.0020.21019.835M6.0*1.0 5.45 5.50 5.55No.5-44 2.86M
4.5*0.75
音节带声调吗3.80 3.878 3.688M22*1.520.5020.67620.376M7.0*1.0 6.45 6.50 6.55No.6-40 3.16M5.0*0.8
4.20 4.334 4.134M22*1.021.0021.15320.917M8.0*1.257.317.387.44No.8-36 3.78M
5.0*0.9
4.10 4.170 3.930M24*2.022.0022.21021.835M10*1.59.189.259.32No.10-32 4.39 4.43M6.0*1.0
5.00 5.153 4.917M24*1.522.5022.67622.376M10*1.259.319.389.44No.12-28 4.99 5.04SM1/8 -40M7.0*1.0
6.00 6.153 5.917M24*1.023.0023.15322.917M12*1.7511.0411.1211.211/4 -28 5.85 5.90SM1/8 -44M8.0*1.25
6.80 6.912 6.647M25*2.023.0023.21022.835M12*1.2511.3111.3811.445/16 -24金哲夫
7.367.41SM9/64 -40M9.0*1.25
7.807.9127.647M25*1.523.5023.67623.3763/8 -249.00SM11/64-40M10*1.5
8.508.6768.376M25*1.024.0024.15323.9177/16 -2010.48SM3/16 -32M11*1.5
9.509.6769.376M26*1.524.5024.67624.3761/2 -2012.07SM3/16 -28M12*1.75
10.3010.44110.106M27*2.025.0025.21024.835SM7/32 -32M14*2.0
12.0012.21011.835M27*1.525.5025.67625.376SM15/64-28M16*2.0莱维特
14.0014.21013.835M27*1.026.0026.15325.917SM1/4 -40M18*2.5
15.5015.74415.294M28*2.026.0026.21025.835SM1/4 -28M20*2.5
17.5017.74417.294M28*1.526.5026.67626.376SM9/32 -28M22*2.5
19.5019.74419.294M28*1.027.0027.15326.917规格最大SM11/32-28M24*3.0 21.0021.25220.752M30*3.027.0027.25226.752(UNC)最大最小PS 1/16 - 28 6.50 6.632SM3/8 -28M27*3.0
24.0024.25223.752M30*2.028.0028.21027.835 (螺丝牙外径)PS 1/8 - 288.508.637SM7/16 -28M30*3.526.5026.77126.211M30*1.5
28.5028.67628.376No.1-64(1.854) 1.55 1.582 1.425PS 1/4 - 1911.4011.549M30*1.0
29.0029.15328.917No.2-56(2.184) 1.80 1.871 1.695PS 3/8 - 1915.0015.054M32*2.0
30.0030.21029.835No.3-48(2.515) 2.10 2.146 1.941PS 1/2 - 1418.5018.773M32*1.5
30.5030.67630.376No.4-40(2.845) 2.30 2.385 2.157PS 3/4 - 1424.0024.259M33*3.0
30.0030.25229.752No.5-40(3.175) 2.60 2.697 2.487PS 1 - 1130.2030.471M33*2.0
31.0031.21030.835No.6-32(3.505) 2.80 2.895 2.642PS 1-1/4 - 1138.8039.132最大最小M33*1.5
31.5031.67631.376No.8-32(4.166) 3.40 3.53 3.302PS 1-1/2 - 1144.8045.025M1.0*0.20.800.8210.783M35*1.5
33.5033.67633.376No.10-24(4.826) 3.90 3.962 3.683PS 2 - 1156.5056.836M1.1*0.20.900.9210.883M36*3.0
33.0033.25232.752No.12-24(5.486) 4.50 4.597 4.344M1.2*0.2 1.00 1.0210.983M36*2.0
34.0034.21033.8351/4 - 20 5.10 5.257 4.979M1.4*0.2 1.20 1.221 1.183M36*1.534.5034.67634.
3765/16 - 18 6.60 6.731 6.401
M1.6*0.2 1.40 1.421 1.3833/8 - 168.008.1537.798
M1.7*0.2 1.45 1.500 1.4607/16 - 149.409.559.144
M1.8*0.2 1.60 1.621 1.5831/2 - 1310.8011.02310.592
使用绞刀时不用绞刀时M2.0*0.25 1.75 1.785 1.7299/16 - 1212.2012.44611.989
PT 1/16 -28 6.10 6.20 6.244 6.384M2.2*0.25 1.95 1.985 1.929规格5/8 - 1113.6012.86813.386
PT 1/8 -288.108.208.4298.388M2.3*0.25 2.05 2.061 2.001(UNF)最大最小3/4 - 1016.5018.8416.307
PT 1/4 -1910.7011.0010.96211.174M2.5*0.35 2.20 2.221 2.1217/8 - 919.5019.76119.177
PT 3/8 -1914.2014.5014.44814.658M2.6*0.35 2.20 2.246 2.186No.0-80(1.524) 1.25 1.305 1.182 1 - 822.2022.60621.971
PT 1/2 -1417.6018.0017.97918.263M3.0*0.35 2.70 2.721 2.621No.1-72(1.854) 1.55 1.612 1.474
1-1/8 - 725.0025.34924.638
朔州秧歌戏PT 3/4 -1423.0023.5023.37823.663M3.5*0.35 3.20 3.221 3.121No.2-64(2.184) 1.85 1.912 1.7561-1/4 - 728.2028.52427.813
PT 1 -1129.0029.5029.45929.822M4.0*0.5 3.50 3.599 3.459No.3-56(2.515) 2.10 2.197 2.0251-3/8 - 630.8031.11530.353
PT 1-1/4 -1137.5038.0037.97638.339M4.5*0.5 4.00 4.099 3.959No.4-48(2.845) 2.40 2.458 2.2711-1/2 - 634.0034.2933.528
PT 1-1/2 -1143.4044.0043.86944.232M5.0*0.5 4.50 4.599 4.459No.5-44(3.175) 2.70 2.74 2.5511-3/4 - 539.5039.82738.964
PT 2 -1154.9055.5055.41255.844M5.5*0.5
5.00 5.099 4.959No.6-40(3.505) 2.90 3.022 2.82 2 - 4-1/245.2045.59344.679M
6.0*0.75
5.30 5.378 5.188No.8-36(4.166) 3.50 3.606 3.404M
6.0*0.5
5.50 5.550 5.400No.10-32(4.826) 4.10 4.165 3.963M7.0*0.75五点法
6.30 6.378 6.188No.12-28(5.846) 4.60 4.724 4.496M
7.0*0.5
6.50 6.550 6.4001/4 - 28 5.50 5.588 5.36M8.0*1.0
7.007.153 6.9175/16 - 24 6.907.035 6.782规格M8.0*0.75
7.307.3787.1883/8 - 248.508.6368.382(UNEF)最大最小使用绞刀时不用绞刀时M8.0*0.5
7.507.5207.4007/16 - 209.9010.0339.729No.12 - 32 4.70 4.826 4.6231/16 - 27 6.10 6.25M9.0*1.0
8.008.1537.9171/2 - 2011.5011.60711.3291/4 - 32 5.60 5.69 5.4861/8 -278.338.43M9.0*0.75
8.308.3788.1889/16 - 1812.9013.08112.7515/16 - 327.107.2647.0871/4 -1810.7211.13M10*1.
25
8.808.9128.4675/8 - 1814.5014.68114.3513/8 - 328.708.8658.6613/8 -1814.2714.27M10*1.0
9.009.1538.9173/4 - 1617.5017.67817.3237/16 - 2810.2010.33810.1351/2 -1417.4817.86M10*0.75
9.309.3789.1887/8 - 1420.5020.67520.271/2 - 2811.8011.93811.7093/4 -1422.6323.01M10*0.5
9.509.5209.400 1 - 1223.2023.57123.1149/16 - 2413.2013.38613.132 1 -11-1/228.5828.98M11*1.0
10.0010.1539.9171-1/8 - 1226.5026.74626.2895/8 - 2414.8014.98614.7321-1/4 -11-1/237.3137.69M11*0.75
10.3010.37810.1881-1/4 - 1229.5029.92129.4643/4 - 2017.8017.95817.6781-1/2 -11-1/243.6644.04M12*1.5
10.5010.67610.3761-3/8 - 1232.8033.09632.6397/8 - 2021.0021.13320.853 2 -11-1/255.5855.96
M12*1.2510.8010.91210.6471-1/2 - 1236.0036.27135.814 1 - 2024.0024.30824.028螺 纹 攻 牙 钻 孔 径 和 滚 造 径 对 照 表
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，若有不标准径2级牙钻孔径标准径2级牙钻孔径 4.0-4.2M4.0*0.7M4.0*0.75M4.5*0.75钻 孔 径3.4-3.63.0-3.2英制电器螺纹4BA 规 格2BA SM7/16 -16SM1/2 -20M6.0*1.0M7.0*1.0M8.0*1.0M8.0*1.25规格M3*0.5M3.0*0.6M3.5*0.6M5.0*0.8M5.0*0.9 4.36-4.315.30-5.255BA 6BA 3BA 7.12-7.072.7-2.82.4-2.5滚造径2.63-2.602.56-2.533.06-3.036.30-6.257.28-7.233.49-3.453.45-3.413.96-3.924.43-4.3811.819-11.74913.400-13.425公 制 螺 纹注：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。SM9/16 -208.092-8.4328.880-8.01510.466-10.40110.037-9.9675.325-5.5702.735-2.6882.769-2.7223.128-3.0835.890-5.7355.721-5.3666.508-6.6483.855-3.8054.205-4.1554.143-4.0935.003-4.955W1 -8W1-1/8-7W1-1/4-7规格针 车 用 螺 纹滚造径W7/16 -14W1/2 -12W9/16 -12W5/8 -11W3/4 -10W7/8 -9W1/8 -40W5/32 -32W3/16 -24W1/4 -20W5/16 -18W3/8 -16英 制 螺 纹钻孔径规 格6.358.7411.1314.6818.2623.4229.36规格N P T N P S 38.1044.4556.36英 制 管 螺 纹44.6655 6.47618.48923.97530.11138.772钻孔径最小规格标准径有效牙部之长度(最小)中之母螺牙内径6.498.49511.34114.846标准长度(最小)中之母螺牙内径10.5412.13英 制 管 螺 纹8.8110.3011.82美 制 迫 牙 丝 攻 钻 孔 径精 度 等 级G9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 细 螺 纹2级牙钻孔径标准径规格
公 制 粗 螺 纹
公 制 迫 牙 丝 攻 钻 孔 径规 格精 度 等 级美 制 粗 螺 纹规格公 制 细 螺 纹规格标准径2级牙钻孔径标准径2级牙钻孔径标准径2级牙钻孔径美 制 特 细 螺 纹规 格 (螺丝牙外径)美 制 细 螺 纹美 制 管 螺 纹钻 孔 径标准径规 格
螺丝攻牙钻孔径对照表美制（粗）挤牙丝攻钻孔径
游离龈公制挤牙丝攻钻孔径美制细牙螺纹公制粗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最大最小最大最小最大最小3-48RH4 2.32 2.25M1.1 0.25RH4 1.02 1.00螺丝牙外径M1.0 0.250.750.7850.729M7.0 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 1.182M1.1 0.250.850.8850.829M8.0 1.007.007.153 6.9175-40RH5 2.93 2.86M1.4 0.30RH4 1.294 1.270No.1-72（1.854） 1.55 1.612 1.474M1.2 0.250.950.9850.929M8.0 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 1.756M1.4 0.30 1.10 1.142 1.075M8.0 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 2.025M1.6 0.35 1.25 1.321 1.221M9.0 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 2.271M1.7 0.35 1.35 1.421 1.321M9.0 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 2.551M1.8 0.35 1.45 1.521 1.421M10.0 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 2.820M2.0 0.40 1.60 1.679 1.567M10.0 1.009.009.1538.9175/16-18RH77.297.18M2.6 0.45RH4 2.43 2.38No.8-36（4.166） 3.50 3.606 3.404M2.2 0.45 1.75 1.838 1.713M10.0 0.759.309.3789.1883/8-16RH78.788.66M3.0
0.50RH5 2.81 2.76No.10-32（4.826） 4.10 4.165 3.963M2.3 0.40 1.90 1.979 1.867M10.0 0.509.509.5209.4007/16-14RH710.2510.11M3.5 0.60RH5 3.26 3.20No.12-28（5.486） 4.60 4.724 4.496M2.5 0.45 2.10 2.138 2.013M11.0 1.0010.0010.1539.9171/2-13RH811.7811.62M4.0 0.70RH6 3.70 3.651/4-28 5.50 5.588 5.360M2.6 0.45 2.20 2.238 2.113M11.0 0.7510.3010.37810.1889/16-12RH1013.2713.14M5.0 0.80RH6 4.66 4.595/16-24 6.907.035 6.782M3.0 0.50 2.50 2.599 2.459M12.0 1.5010.5010.67610.3765/8-11RH1114.7614.62M6.0 1.00RH7 5.57 5.483/8-248.508.6368.382M3.5 0.60 2.90 3.010 2.850M12.0 1.2510.8010.91210.6473/4-10RH1217.8817.67M7.0 1.00RH7 6.57 6.487/16-209.9010.0339.729M4.0 0.70 3.30 3.422 3.242M12.0 1.0011.0011.15310.9177/8-9RH1220.8520.68M8.0 1.00RH77.577.481/2-2011.5011.60711.329M4.5 0.75 3.80 3.878 3.688M12.0 0.5011.5011.52011.4001-8RH1323.8423.65M8.0 1.25RH77.417.349/16-1812.9013.08112.751M5.0 0.80 4.20 4.334 4.134M14.0 1.5012.5012.67612.376M10 1.00RH79.579.485/8-1814.5014.68114.351M6.0 1.00 5.00 5.153 4.917M14.0 1.0013.0013.15312.917美制（细）挤牙丝攻钻孔径
M10 1.25RH79.419.343/4-1617.5017.67817.323M7.0 1.00 6.00 6.153 5.917M15.0 1.5013.5013.67613.376规格精度max min M10 1.50RH79.289.187/8-1420.5020.67520.270M8.0 1.2
5 6.80 6.912 6.647M15.0 1.0014.0014.15313.9172-64UNF RH3 2.04 1.98M12 1.00RH711.5711.181-1223.3023.57123.114M9.0 1.257.807.9127.647M16.0 1.5014.5014.67614.3763-56RH4 2.35 2.29M12 1.25RH711.4111.051-1/8-1226.5026.74626.289M10.0 1.508.508.6768.376M16.0 1.0015.0015.15314.9174-48RH4 2.64 2.57M12 1.50RH711.2811.481-1/4-1229.6029.92129.464M11.0 1.509.509.6769.376M17.0 1.5015.5015.67615.3765-44RH4 2.95 2.88M12 1.75RH811.1511.341-3/8-1232.8033.09632.639M12.0 1.7510.3010.44110.106M17.0 1.0016.0016.15315.9176-40RH5 3.26 3.19M14 1.50RH913.3013.211-1/2-1236.0036.27135.814M14.0 2.0012.0012.21011.835M18.0 2.0016.0016.21015.8358-36RH5 3.88 3.80M14 2.00RH1013.0412.92M16.0 2.0014.0014.21013.835M18.0 1.5016.5016.67616.37610-32RH5 4.48 4.41M16 1.50RH915.3015.21M18.0 2.5015.5015.74415.294M18.0 1.0017.0017.15316.91712-28RH5 5.08 5.00M16 2.00RH1015.0414.92M20.0 2.5017.5017.74417.294M20.0 2.0018.0018.21017.8351/4-28RH5 5.93 5.86M18 1.5RH1017.3117.22M22.0 2.5019.5019.74419.294M20.0 1.5018.5018.67618.3765/16-24RH67.467.38M18 2.5RH1116.7816.63M24.0 3.0021.0021.25220.752M20.0 1.0019.0019.15318.9173/8-24RH69.058.96M20 1.5RH1019.3119.22M27.0 3.0024.0024.25223.752M22.0 2.0020.0020.21019.8357/16-20RH710.5410.44M20 2.5RH1118.7818.63M30.0 3.5026.5026.77126.211M22.0 1.5020.5020.67620.
3761/2-20RH712.1212.02M33.0 3.5029.5029.77129.211M22.0 1.0021.0021.15320.9179/16-18RH913.6613.55最大最小M36.0 4.0032.0032.27031.670M24.0 2.0022.0022.21021.8355/8-18RH915.2515.14螺丝牙外径M39.0 4.0035.0035.27034.670M24.0 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 2.0023.0023.21022.8351-12RH1224.4124.28＜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 2.157最大最小M25.0 1.0024.0024.15323.917 =2.80No.5-40（3.175） 2.60 2.697 2.487M1.0 0.200.800.8210.783M26.0 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 2.642M1.1 0.200.900.9210.883M27.0 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 3.302M1.2 0.20 1.00 1.0210.983M27.0 1.5025.5025.67625.3761000.254012 2.1167No.10-24（4.826） 3.90 3.962 3.683M1.4 0.20 1.20 1.221 1.183M27.0 1.0026.0026.15325.917800.317511 2.3091No.12-24（5.486） 4.50 4.597 4.344M1.6 0.20 1.40 1.421 1.383M28.0 2.0026.0026.21025.835720.352810 2.54001/4-20
5.10 5.257 4.979M1.7 0.20 1.50 1.521 1.483M28.0 1.5026.5026.67626.376640.39699 2.82225/16-18 6.60 6.731 6.401M1.8 0.20 1.60 1.621 1.583M28.0 1.0027.0027.15326.917600.42338 3.17503/8-168.008.1537.798M2.0 0.25 1.75 1.785 1.729M30.0 3.0027.0027.25226.752560.45367 3.62867/16-149.409.5509.144M2.2 0.25 1.95 1.985 1.929M30.0 2.0028.0028.21027.835480.52926 4.23331/2-1310.9011.02310.592M2.3 0.25 2.05 2.061 2.001M30.0 1.5028.5028.67628.376440.57735 5.0800规格吋mm 9/16-1212.2012.46611.989M2.5 0.35 2.20 2.221 2.121M30.0 1.0029.0029.15328.917400.63504 1/2 5.6444 No. 00.0600 1.5245/8-1113.6013.86813.386M2.6 0.35 2.20 2.246 2.186M32.0 2.0030.0030.21029.835360.70564 6.350010.0730 1.8543/4-1016.6016.84016.307M3.0 0.35 2.70 2.721 2.621M32.0 1.5030.5030.67630.376320.79383 1/27.257120.0860 2.1847/8-919.6019.76119.177M3.5 0.35 3.20 3.221 3.121M33.0 3.0030.0030.25229.752280.90713 1/47.815430.0990 2.5151-822.3022.60621.971M4.0 0.40 3.50 3.599 3.459M33.0 2.0031.0031.21030.83524 1.058338.466740.1120 2.8451-1/8-725.0025.34924.638M4.5 0.40 4.00 4.099 3.959M33.0 1.5031.5031.67631.37620 1.27002 7/88.834850.1250 3.1751-1/4-728.2028.52427.813M5.0 0.40 4.50 4.599 4.459M35.0 1.5033.5033.67633.37618 1.41112 3/49.236460.1380 3.5051-3/8-630.8031.11530.353M5.5 0.40 5.00 5.099 4.959M36.0 3.0033.0033.25232.75216 1.58752 5/89.676280.1640 4.1661-1/2-634.0034.29033.528M6.0 0.75 5.30 5.378 5.188M36.0 2.0034.0034.21033.83514 1.81432 1/210.1600
100.1900 4.8261-3/4-539.5039.82738.964M6.0 0.50 5.50 5.550 5.400M36.0 1.5034.5034.67634.37613 1.9538120.2160 5.4862-4-1/245.2045.59344.679M7.0 0.75 6.30 6.378 6.188美制螺丝外径公厘（mm ）换算表美制粗牙螺纹公制细牙螺纹规格标准径2级牙钻孔径NRT 下孔径计算式规格标准径2级牙钻孔径规格标准径2级牙钻孔径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
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