無溝絲攻適用孔徑螺紋牙套適用孔徑
規格最小孔徑建議孔徑最小孔徑最大孔徑最小孔徑最大孔徑M1*0.25 0.73 0.78
M1.1*0.25 0.83 0.89
M1.2*0.25 0.93 0.98
M1.4*0.3 1.08 1.14 1.23 1.26
M1.6*0.35 1.22 1.32
M1.7*0.35 1.33 1.42 1.5 1.55
M1.8*0.35 1.42 1.52
M2*0.4 1.57 1.67 1.77 1.83
M2.2*0.45 1.71 1.84 1.95 2.01
M2.3*0.4 1.87 1.97 2.07 2.13
M2.5*0.45 2.01 2.14 2.25 2.31
M2.6*0.45 2.12 2.23 2.35 2.41
M 3*0.5 2.46 2.6 2.64 2.72 2.79 3.12 3.2
M3.5*0.6 2.85 3.01 3.05 3.16 3.24
M 4*0.7 3.24 3.42 3.47 3.6 3.69 4.17 4.3
M4.5*0.75 3.69 3.88 3.92 4.07 4.17
M 5*0.8 4.13 4.33 4.38 4.55 4.65 5.16 5.33
M 6*1.0 4.92 5.15 5.22 5.43 5.55 6.25 6.42
M 7*1.0 5.92 6.15 6.22 6.43 6.55 7.25 7.42
M 8*1.25 6.65 6.91 6.98 7.29 7.42 8.31 8.52
M 9*1.25 7.65 7.91 7.98 8.29 8.42
M 10*1.5 8.38 8.68 8.75 9.15 9.3 10.37 10.62
M 11*1.5 9.38 9.68 9.75 10.15 10.3
M 12*1.75 10.11 10.44 10.53 11.01 11.19 12.43 12.73
M 14*2.0 11.84 12.21 12.31 14.49 14.83
M 16*2.0 13.84 14.21 14.31 16.49 16.83
M 18*2.5 15.29 15.74 15.85 18.58 19.04
M 20*2.5 17.29 17.74 17.85 20.58 21.04
M 22*2.5 19.29 19.74 19.85
M 24*3.0 20.75 21.25 21.38
M 27*3.0 23.75 24.25 24.38
M 30*3.5 26.21 26.77 26.92
M 33*3.5 29.21 29.77 29.92
M 36*4.0 31.67 32.27 32.42
M 39*4.0 34.67 35.27 32.42
M 42*4.5 37.13 37.8 37.98
M 45*4.5 40.13 40.8 40.98
M 48*5.0 42.59 43.3 43.49
英制牙粗牙
無溝絲攻適用孔徑螺紋牙套適用孔徑
規格最小孔徑最大孔徑最小孔徑最大孔徑最小孔徑最大孔徑
W 1/16-60 1.3
W 1/8 -40 2.6
W 5/32-32 3.2
W 3/16-24 3.8
W 1/4 -20 5 5.1 5.63 5.77
W 5/16-18 6.5 6.6 7.13 7.3
W 3/8 -16 7.9 8 8.63 8.8
W 7/16-14 9.3 9.4 10.09 10.29
W 1/2 -12 10.5 10.7 11.6 11.82
W 9/16 -12 12 12.3
W 5/8 -11 13.5 13.7
W 3/4 -10 16.5 16.7
W 7/8 -9 19.3 19.5
W 1 -8 22 22.4
W1-1/8 -7 24.8 25
W1-1/4 -7 28 28.3
W1-3/8 -6 30.3 30.5
W1-1/2 -6 33.5 33.8
W1-5/8 -5 35.7 36
W1-3/4 -5 39 39.2
W1-7/8 -4.5 41.5 41.8
W 2 -4.5 44.7 45
美制牙粗牙
無溝絲攻適用孔徑螺紋牙套適用孔徑
規格最小孔徑最大孔徑最小孔徑最大孔徑最小孔徑最大孔徑NO. 1-64UNC 1.43 1.58 1.63 1.71
NO. 2-56UNC 1.69 1.87 1.93 2.02
NO. 3-48UNC 1.94 2.15 2.22 2.32
NO. 4-40UNC 2.16 2.39 2.49 2.61 2.95 3.07
NO. 5-40UNC 2.49 2.7 2.82 2.92 3.25 3.38
NO. 6-32UNC 2.64 2.9 3.05 3.19 3.66 3.81
NO. 8-32UNC 3.3 3.53 3.71 3.83 4.32 4.47
NO.10-24UNC 3.68 3.96 4.23 4.37 5.05 5.21
NO.12-24UNC 4.34 4.6 4.88 5.02
1/4 -20UNC 4.98 5.26 5.63 5.77 6.63 6.78
5/16-18UNC 6.4 6.73 7.13 7.3 8.33 8.48
3/8 -16UNC 7.8 8.15 8.63 8.8 9.91 10.11
7/16-14UNC 9.14 9.55 10.09 10.29 11.51 11.76
1/2 -13UNC 10.59 11.02 11.6 11.82 13.08 13.34
9/16-12UNC 11.99 12.45 14.68 14.94
5/8 -11UNC 13.39 13.87 16.59 16.84
3/4 -10UNC 16.31 16.84 19.84 20.09
7/8 -9 UNC 19.18 19.76
1 -8 UNC 21.97 22.61
1-1/8 -7 UNC 24.64 25.35
1-1/4 -7 UNC 27.81 28.52
1-1/2 -6 UNC 33.53 34.29
1-3/4 -5 UNC 38.96 39.83
2 - 4 1/2UNC 44.68 45.59
公制牙細牙
無溝絲攻適用孔徑螺紋牙套適用孔徑
規格最小孔徑建議孔徑最小尺寸最大尺寸最小孔徑最大孔徑M2.5*0.35 2.12 2.22 2.3 2.35
M 3*0.35 2.62 2.72 2.8 2.85
M3.5*0.35 3.12 3.22 3.3 3.35
M 4*0.5 3.46 3.6 3.64 3.72 3.79
M4.5*0.5 3.96 4.1 4.14 4.22 4.29
M 5*0.5 4.46 4.6 4.64 4.72 4.79
M5.5*0.5 4.96 5.1 5.14 5.22 5.29
M6*0.75 5.19 5.38 5.42 5.57 5.67
M7*0.75 6.19 6.38 6.42 6.57 6.67
M8*1.0 6.92 7.15 7.22 7.43 7.55 8.25 8.42
M8*0.75 7.19 7.38 7.42 7.57 7.67
M9*1.0 7.92 8.15 .22 8.43 8.55
M9*0.75 8.19 8.38 8.42 8.57 8.67
M 10*1.25 8.65 8.91 8.98 9.29 9.43 10.31 10.52
M 10*1.0 8.92 9.15 9.22 9.43 9.55 10.25 10.42
M 10*0.75 9.19 9.38 9.42 9.57 9.67
M 11*1.25 9.52 9.8 9.88
M 11*1.0 9.92 10.15 10.22 10.43 10.55
M 11*0.75 10.19 10.38 10.42 10.57 10.67
M 12*1.5 10.38 10.68 10.75 11.15 11.3 12.37 12.62
M 12*1.25 10.65 10.91 10.98 11.29 11.43 12.31 12.52
M 12*1.0 10.92 11.15 11.22 11.43 11.55
M 14*1.5 12.38 12.68 12.75 14.37 14.4
M 14*1.0 12.92 13.15 13.22
M 15*1.5 13.38 13.68 13.75
M 15*1.0 13.92 14.15 14.22
M 16*1.5 14.38 14.68 14.75 16.37 16.62
M 16*1.0 14.92 15.15 15.22
M 17*1.5 15.38 15.68 15.75
M 17*1.0 15.92 16.15 16.22
M 18*2.0 15.84 16.21 16.31
M 18*1.5 16.38 16.68 16.75 18.37 18.62
M 18*1.0 16.92 17.15 17.22
M 20*2.0 17.84 18.21 18.31
M 20*1.5 18.38 18.68 18.75 20.37 20.62
M 20*1.0 18.92 19.15 19.22
M 22*2.0 19.84 20.21 20.31
M 22*1.5 20.38 20.68 20.75
M 22*1.0 20.92 21.15 21.22
M 24*1.0 22.92 23.15 23.22 M 25*2.0 22.84 23.21 23.31 M 25*1.5 23.38 23.68 23.75 M 25*1.0 23.92 24.15 24.22 M 26*2.0 23.63 24.08 24.18 M 26*1.5 24.38 24.68 24.75 M 27*2.0 24.84 25.21 25.31 M 27*1.5 25.38 25.68 25.75 M 27*1.0 25.92 26.15 26.22 M 28*2.0 25.84 26.21 26.31 M 28*1.5 26.38 26.68 26.75 M 28*1.0 26.92 27.15 27.22 M 30*3.0 26.75 27.25 27.38 M 30*2.0 27.84 28.21 28.31 M 30*1.5 28.38 28.68 28.75 M 30*1.0 28.92 29.15 29.22 M 32*2.0 29.84 30.21 30.31 M 32*1.5 30.38 30.68 30.75 M 33*3.0 29.75 30.25 30.38 M 33*2.0 30.84 31.21 31.31 M 33*1.5 31.38 31.68 31.75 M 35*1.5 33.38 33.68 33.75 M 36*3.0 32.75 33.25 33.38 M 36*2.0 33.84 34.21 34.31 M 36*1.5 34.38 34.68 34.75 M 38*2.0 35.62 36.08 36.18 M 38*1.5 36.38 36.68 36.75 M 39*3.0 35.75 36.25 36.38 M 39*2.0 36.84 37.21 37.31 M 39*1.5 37.38 37.68 37.75 M 40*3.0 36.75 37.25 37.38 M 40*2.0 37.84 38.21 38.31 M 40*1.5 38.38 38.68 38.75 M 42*4.0 37.67 38.27 38.42 M 42*3.0 38.75 39.25 39.38 M 42*2.0 39.84 40.21 40.31 M 42*1.5 40.38 40.68 40.75 M 45*4.0 40.67 41.27 41.42 M 45*3.0 41.75 42.25 42.38 M 45*2.0 42.84 43.21 43.31 M 45*1.5 43.38 43.68 43.75 M 48*4.0 43.67 44.27 44.42 M 48*3.0 44.75 45.25 45.38 M 48*2.0 45.84 46.21 46.31
M 50*2.0 47.84 48.21 48.31
螺纹底孔直径公制普通粗牙螺纹 螺纹代号 钻头直径HSS 硬质合金 M2×0.4 1.6 1.65 M3×0.5 2.5 2.55 M4×0.7 3.3 3.4 M5×0.8 4.2 4.3 M6×1.0 5.0 5.1 M8×1.25 6.8 6.9 M10×1.5 8.5 8.7 M12×1.75 10.3 10.5 M14×2.0 12.0 12.2 M16×2.0 14.0 14.2 M18×2.5 15.5 15.7 M20×2.5 17.5 17.7 M24×3.0 21.0 ……M30×3.5 26.5 ……M36×4.0 32.0 ……M42×4.5 37.5 ……M45×4.5 40.5 ……M48×5.0 43.0 ……
公制细牙螺纹 螺纹代号 钻头直径HSS 硬质合金 M2×0.25 1.75 1.75 M3×0.35 2.7 2.7 M4×0.5 3.5 3.55 M5×0.5 4.5 4.55 M6×0.75 6.3 6.35 M8×1.0 7 7.1 M8×0.75 7.3 7.35 M10×1.0 9 9.1 M10×1.25 8.8 8.9 M10×0.75 9.3 9.35 M12×1.5 10.5 10.7 M12×1.25 10.8 10.9 M12×1.0 11 11.1 M14×1.5 12.5 12.7 M14×1.0 13.0 13.1 M16×1.5 14.5 14.7 M16×1.0 15.0 15.1 M18×1.5 16.5 16.7 M18×1.0 17 17.1
M20×2.0 18 18.3 M20×1.5 18.5 18.7 M20×1.0 19 19.1 M24×2.0 22.0 ……M24×1.5 22.5 ……M24×1.0 23.0 ……M30×3 27 ……M30×2 28 ……M30×1.5 28.5 ……M30×1.5 29 ……M36×3.0 33.0 ……M36×2 34.0 ……M36×1.5 34.5 ……M42×4 38 ……M42×3 39 ……M42×2 40 ……M42×1.5 40.5 ……M45×4 41 ……M45×3 42 ……M45×2 43 ……M45×1.5 43.5 ……
最大最小最大最小G4-G6G7-G8G9M1.0*0.250.750.7850.729M12*1.011.0011.15310.917M1.0*0.250.860.88M1.1*0.250.850.8850.829M12*0.511.5011.52011.400M1.1*0.250.960.98最大M1.2*0.250.950.9850.929M14*1.512.5012.67612.376M1.2*0.25 1.06 1.08G 1/167.72 6.84M1.4*0.3 1.10 1.142 1.075M14*1.013.0013.15312.917M1.4*0.3 1.24 1.25G(PF)1/89.738.85M1.6*0.35 1.25 1.321 1.221M15*1.513.5013.67613.376M1.6*0.35 1.41 1.431/413.1611.89M1.7*0.35 1.35 1.421 1.321M15*1.014.0014.15313.917M1.7*0.35 1.51 1.533/816.6615.40M1.8*0.35 1.45 1.521 1.421M16*1.514.5014.67614.376M1.8*0.35 1.61 1.631/220.9619.17M2.0*0.4 1.60 1.679 1.567M16*1.015.0015.15314.917M2*0.4 1.78 1.805/822.9121.13M2.2*0.45 1.75 1.838 1.713M17*1.515.5015.67615.376M2.2*0.45 1.95 1.983/426.4424.66M2.3*0.4 1.90 1.979 1.867M17*1.016.0016.15315.917M2.3*0.4 2.08 2.107/830.2028.42M2.5*0.45 2.10 2.138 2.013M18*2.016.0016.21015.835M2.5*0.45 2.25 2.28133.2530.93M2.6*0.45 2.20 2.238 2.113M18*1.516.5016.67616.376M2.6*0.45 2.35 2.38 1.12537.9035.58M3.0*0.5 2.50 2.599 2.459M18*1.017.0017.15316.917M3.0*0.5 2.73 2.75 1.2541.9139.59M3.0*0.6 2.40 2.440 2.280M20*2.018.0018.21017.835M3.5*0.6 3.17 3.20 1.37544.3242.01M3.5*0.6 2.90 3.010 2.850M20*1.518.5018.67618.376M4.0*0.7 3.62 3.65 3.69 1.547.8049.02M4.0*0.7 3.30 3.422 3.242M20*1.019.0019.15318.917M5.0*0.8 4.56 4.60 4.64 1.62551.9150.79M4.0*0.75 3.25 3.326 3.106M22*2.020.0020.21019.835M6.0*1.0 5.45 5.50 5.55 1.7553.7556.66 M4.5*0.75 3.80 3.878 3.688M22*1.520.5020.67620.376M7.0*1.0 6.45 6.50 6.552 59.61 M5.0*0.8 4.20 4.334 4.134M22*1.021.0021.15320.917M8.0*1.257.317.387.44M5.0*0.9 4.10 4.170 3.930M24*2.022.0022.21021.835M10*1.59.189.259.32M6.0*1.0 5.00 5.153 4.917M24*1.522.5022.67622.376M10*1.259.319.389.44M7.0*1.0 6.00 6.153 5.917M24*1.023.0023.15322.917M12*1.7511.0411.1211.21M8.0*1.25 6.80 6.912 6.647M25*2.023.0023.21022.835M12*1.25 11.3111.3811.44 M9.0*1.257.807.9127.647M25*1.523.5023.67623.376最大M10*1.58.508.6768.376M25*1.024.0024.15323.917PS 1/16 - 28 6.50 6.632M11*1.59.509.6769.376M26*1.524.5024.67624.376PS 1/8 - 288.508.637M12*1.7510.3010.44110.106M27*2.025.0025.21024.835PS 1/4 - 1911.4011.549M14*2.012.0012.21011.835M27*1.525.5025.67625.376PS 3/8 - 1915.0015.054M16*2.014.0014.21013.835M27*1.026.0026.15325.917PS 1/2 - 1418.5018.773M18*2.515.5015.74415.294M28*2.026.0026.21025.835PS 3/4 - 1424.0024.259M20*2.517.5017.74417.294M28*1.526.5026.67626.376PS 1 - 1130.2030.471M22*2.519.5019.74419.294M28*1.027.0027.15326.917规格PS 1-1/4 - 1138.8039.132M24*3.021.0021.25220.752M30*3.027.0027.25226.752(UNC) 最大最小PS 1-1/2 - 1144.8045.025M27*3.024.0024.25223.752M30*2.028.0028.21027.835 (螺丝牙外径) PS 2 - 11 56.50 56.836 M30*3.5 26.50 26.771 26.211 M30*1.528.5028.67628.376No.1-64(1.854) 1.55 1.582 1.425M30*1.029.0029.15328.917No.2-56(2.184) 1.80 1.871 1.695M32*2.030.0030.21029.835No.3-48(2.515) 2.10 2.146 1.941M32*1.530.5030.67630.376No.4-40(2.845) 2.30 2.385 2.157M33*3.030.0030.25229.752No.5-40(3.175) 2.60 2.697 2.487M33*2.031.0031.21030.835No.6-32(3.505) 2.80 2.895 2.642最大最小M33*1.531.5031.67631.376No.8-32(4.166) 3.40 3.530 3.302M1.0*0.20.800.8210.783M35*1.533.5033.67633.376No.10-24(4.826) 3.90 3.962 3.683M1.1*0.20.900.9210.883M36*3.033.0033.25232.752No.12-24(5.486) 4.50 4.597 4.344PT 1/16 -28 6.10 6.20 6.244 6.384M1.2*0.2 1.00 1.0210.983M36*2.034.0034.21033.8351/4 - 20 5.10 5.257 4.979PT 1/8 -288.108.208.4298.388M1.4*0.2 1.20 1.221 1.183M36*1.5 34.50 34.67634.376 5/16 - 18 6.60 6.731 6.401PT 1/4 -1910.7011.0010.96211.174M1.6*0.2 1.40 1.421 1.3833/8 - 168.008.1537.798PT 3/8 -1914.2014.5014.44814.658M1.7*0.2 1.45 1.500 1.4607/16 - 149.409.5509.144PT 1/2 -1417.6018.0017.97918.263M1.8*0.2 1.60 1.621 1.5831/2 - 1310.8011.02310.592PT 3/4 -1423.0023.5023.37823.663M2.0*0.25 1.75 1.785 1.7299/16 - 1212.2012.44611.989PT 1 -1129.0029.5029.45929.822M2.2*0.25 1.95 1.985 1.929规格5/8 - 1113.6012.86813.386PT 1-1/4 -1137.5038.0037.97638.339M2.3*0.25 2.05 2.061 2.001(UNF) 最大最小3/4 - 1016.5018.84016.307PT 1-1/2 -1143.4044.0043.86944.232M2.5*0.35 2.20 2.221 2.1217/8 - 919.5019.76119.177PT 2 -11 54.9055.5055.41255.844 M2.6*0.35 2.20 2.246 2.186No.0-80(1.524) 1.25 1.305 1.182 1 - 822.2022.60621.971M3.0*0.35 2.70 2.721 2.621No.1-72(1.854) 1.55 1.612 1.4741-1/8 - 725.0025.34924.638M3.5*0.35 3.20 3.221 3.121No.2-64(2.184) 1.85 1.912 1.7561-1/4 - 728.2028.52427.813M4.0*0.5 3.50 3.599 3.459No.3-56(2.515) 2.10 2.197 2.0251-3/8 - 630.8031.11530.353M4.5*0.5 4.00 4.099 3.959No.4-48(2.845) 2.40 2.458 2.2711-1/2 - 634.0034.29033.528M5.0*0.5 4.50 4.599 4.459No.5-44(3.175) 2.70 2.740 2.5511-3/4 - 5 39.5039.82738.964M5.5*0.5 5.00 5.099 4.959No.6-40(3.505) 2.90 3.022 2.820 2 - 4-1/245.20 45.593 44.679 使用绞刀时不用绞刀时 M6.0*0.75 5.30 5.378 5.188No.8-36(4.166) 3.50 3.606 3.4041/16 - 27 6.10 6.25M6.0*0.5 5.50 5.550 5.400No.10-32(4.826) 4.10 4.165 3.9631/8 -278.338.43M7.0*0.75 6.30 6.378 6.188No.12-28(5.846) 4.60 4.724 4.4961/4 -1810.7211.13M7.0*0.5 6.50 6.550 6.4001/4 - 28 5.50 5.588 5.3603/8 -1814.2714.27M8.0*1.07.007.153 6.9175/16 - 24 6.907.035 6.782规格1/2 -1417.4817.86M8.0*0.757.307.3787.1883/8 - 248.508.6368.382(UNEF)最大最小3/4 -1422.6323.01M8.0*0.57.507.5207.4007/16 - 209.9010.0339.729No.12 - 32 4.70 4.826 4.623 1 -11-1/228.5828.98M9.0*1.08.008.1537.9171/2 - 2011.5011.60711.3291/4 - 32 5.60 5.690 5.4861-1/4 -11-1/237.3137.69M9.0*0.758.308.3788.1889/16 - 1812.9013.08112.7515/16 - 327.107.2647.0871-1/2 -11-1/243.6644.04M10*1.258.808.9128.4675/8 - 1814.5014.68114.3513/8 - 328.708.8658.661 2 -11-1/2 55.5855.96 M10*1.09.009.1538.9173/4 - 1617.5017.67817.3237/16 - 2810.2010.33810.135M10*0.759.309.3789.1887/8 - 1420.5020.67520.2701/2 - 2811.8011.93811.709M10*0.59.509.5209.400 1 - 1223.2023.57123.1149/16 - 2413.2013.38613.132M11*1.010.0010.1539.9171-1/8 - 1226.5026.74626.2895/8 - 2414.8014.98614.732M11*0.7510.3010.37810.1881-1/4 - 1229.5029.92129.4643/4 - 2017.8017.95817.678M12*1.510.5010.67610.3761-3/8 - 1232.8033.09632.6397/8 - 2021.0021.13320.853M12*1.25 10.80 10.91210.647 1-1/2 - 1236.0 36.271 35.814 1 - 20 24.00 24.30824.028 规 格使用绞刀时不用绞刀时 有效牙部之长度(最小)中之母螺牙内径 标准长度(最小)中之母螺牙内径 螺 纹 攻 牙 钻 孔 径 和 滚 造 径 对 照 表 英制平行管用螺紋PF(G) (單位：mm) 大 径钻孔径 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 美 制 粗 螺 纹 标准径2级牙钻孔径公 制 粗 螺 纹 公 制 迫 牙 丝 攻 钻 孔 径 规 格精 度 等 级公 制 细 螺 纹 2级牙钻孔径标准径规格14.95 18.6320.5924.12最小6.568.5711.4541.3745.4949.6751.4327.8830.2934.9438.958.49511.341英 制 管 螺 纹 钻孔径 最小规格标准径N P T 14.84623.97530.11138.77218.48944.66556.476 英 制 管 螺 纹 规格18.2623.4229.366.3511.1314.68N P S 44.4556.36 38.108.7457.30 6.490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。 标准径2级牙钻孔径标准径 2级牙钻孔径
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 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 M1.0 M1.1 M1.2 M1.4 M1.6 M1.7 M1.8 M2.0 M2.2 M2.3 M2.5 M2.6 M3.0 M3.0 M3.5 M4.0 M4.0 M4.5 M5.0 M5.0 M6.0 M7.0 最 h < 取小 i 0.785 0.729 NO.1-64(1.854) 1.55 1.582 1.425 i 0.885 0.829 NO.2-56(2.184) 1.80 1.871 1.695 i 0.985 0.985 NO.3-48(2.515)2.10 2.146 1.941 1.142 1.075 NO.4-40( 2.845) 2.30 2.385 2.157 i 1.321 1.221 NO.5-40(3.175) 2.60 2.697 2.487 i 1.421 1.321 NO.6-32(3.505) 2.80 2.895 2.642 i 1.521 1.421 NO8-32(4.166) 3.40 3.53 3.302 1.679 1.567 NO.10-24(4.826) 3.90 3.962 3.683 i 1.838 1.713 NO.12-24(5.486) 4.50 4.597 4.344 1.979 1.867 1/4-20 5.10 5.257 4.979 I 2.138 2.013 5/16-18 6.60 6.731 6.401 I 2.238 2.113 3/8-16 8.00 8.153 7.798 2.599 2.459 ?16-14 9.40 9.55 9.144 2.440 2.280 1/2-13 10.80 11.023 10.592 3.010 2.850 9/16-12 12.20 12.446 11.989 3.422 3.242 ^8-11 13.60 12.868 13.386 i 3.326 3.106 ^4-10 16.50 18.840 16.307 I 3.878 3.688 778-9 19.50 19.761 19.177 4.334 4.134 1 22.20 22.606 21.971 4.170 3.930 1-1/8-7 2 5.00 25.349 24.638 5.153 4.917 1-1/4-7 28.20 28.524 27.813 6.153 5.917 1-3/8-6 30.80 31.115 30.353 0.25 0.75 0.25 0.85 0.25 0.95 0.5 2.50 0.6 2.40 0.6 2.90 0.7 3.30 0.8 4.20 0.9 4.10 1.0 5.00 1.0 6.00 0.3 1.10 0.35 1.25 0.35 1.35 0.35 1.45 0.4 1.60 0.45 1.75 0.4 1.90 0.45 2.10 0.45 2.20 0.75 3.25 0.75 3.80