本表所推選鉆頭孔徑,是針對攻牙加工時,能夠很容易的了解鉆頭直徑,而依據市售的標準鉆頭所選定的,在使用鉆頭的情況下,由于鉆頭的形狀及尺寸,精度,被鉆孔的材質等,對于所鉆孔的尺寸,精度有很大影響,所以使用本表的鉆孔徑,若有不當之處,應實際狀況適當的變更鉆頭直徑,本表依據2級牙制訂。

 

規格 標準徑 2級牙鉆孔徑
最大 最小
M1.0×0.25 0.75 0.785 0.729
M1.1×0.25 0.85 0.885 0.829
M1.2×0.25 0.95 0.985 0.929
M1.4×0.3 1.10 1.142 1.075
M1.6×0.35 1.25 1.321 1.221
M1.7×0.35 1.35 1.421 1.321
M1.8×0.35 1.45 1.521 1.421
M2.0×0.4 1.60 1.679 1.567
M2.2×0.45 1.75 1.838 1.713
M2.3×0.4 1.90 1.979 1.867
M2.5×0.45 2.10 2.138 2.013
M2.6×0.45 2.20 2.238 2.113
M3.0×0.5 2.50 2.599 2.459
M3.0×0.6 2.40 2.44 2.280
M3.5×0.6 2.90 3.010 2.850
M4.0×0.7 3.30 3.422 3.242
M4.0×0.75 3.25 3.326 3.106
M4.5×0.75 3.80 3.878 3.688
M5.0×0.8 4.20 4.334 4.134
M5.0×0.9 4.10 4.170 3.930
M6.0×1.0 5.00 5.153 4.917
M7.0×1.0 6.00 6.153 5.917
M8.0×1.25 6.80 6.912 6.647
M9.0×1.25 7.80 7.912 7.647
M10×1.5 8.50 8.676 8.376
M11×1.5 9.50 9.676 9.376
M12×1.75 10.30 10.441 10.106
M14×2.0 12.00 12.210 11.735
M16×2.0 14.00 14.210 13.835
M18×2.5 15.50 15.744 15.294
M20×2.5 17.50 17.744 17.294
M22×2.5 19.50 19.744 19.294
M24×3.0 21.00 21.252 2.752
M27×3.0 24.00 24.252 23.752
M30×3.5 26.50 26.771 26.211

 

規格 標準徑 2級牙鉆孔徑
最大 最小
M1.0×0.2 0.80 0.821 0.783
M1.1×0.2 0.90 0.921 0.883
M1.2×0.2 1.00 1.021 0.983
M1.4×0.2 1.20 1.221 0.183
M1.6×0.2 1.40 1.421 1.383
M1.7×0.2 1.45 1.500 1.460
M1.8×0.2 1.60 1.621 1.583
M2.0×0.25 1.75 1.785 1.729
M2.2×0.25 1.95 1.985 1.929
M2.3×0.25 2.05 2.061 2.001
M2.5×0.35 2.20 2.221 2.121
M2.6×0.35 2.20 2.246 2.186
M3.0×0.35 2.70 2.721 2.621
M3.5×0.35 3.20 3.221 3.121
M4.0×0.5 3.50 3.599 3.459
M4.5×0.5 4.00 4.099 3.959
M5×0.5 4.50 4.599 4.459
M5.5×0.5 5.00 5.099 4.959
M6.0×0.75 5.30 5.378 5.188
M6.0×0.5 5.50 5.550 5.400
M7.0×0.75 6.30 6.378 61.88
M7.0×0.5 6.50 6.550 64.00
M8.0×1.0 7.00 7.153 6.917
M8.0×0.75 7.30 7.378 7.188
M8×0.5 7.50 7.520 7.400
M9×1.0 8.00 8.153 7.917
M9×0.75 8.30 8.378 8.188
M10×1.25 8.80 8.912 8.647
M10×1.0 9.00 9.153 8.917
M10×0.75 9.30 9.378 9.188
M10×0.5 9.50 9.520 9.400
M11×1.0 10.00 10.153 9.917
M11×0.75 10.30 10.378 10.188
M11×1.5 10.50 10.676 10.376
M12×1.25 10.80 10.912 10.647

 

規格 標準徑 2級牙鉆孔徑
最大 最小
M12×1.0 11.00 11.153 10.917
M12×0.5 11.50 11.520 11.4
M14×1.5 12.50 12.676 12.376
M14×1.0 13.00 13.153 12.917
M15×1.5 13.50 13.676 13.376
M15×1.0 14.00 14.153 13.917
M16×1.5 14.50 14.676 14.376
M16×1.0 15.00 15.153 14.917
M17×1.5 15.50 15.676 15.376
M17×1.0 16.00 16.153 15.917
M18×2.0 16.00 16.210 15.835
M18×1.5 16.50 16.670 16.376
M18×1.0 17.00 17.153 16.917
M20×2.0 18.00 18.210 17.835
M20×1.5 18.50 18.676 18.376
M20×1.0 19.00 19.153 18.917
M20×2.0 20.00 20.210 19.835
M22×1.5 20.50 20.676 20.376
M22×1.0 21.00 21.153 20.917
M24×2.0 22.00 22.210 21.835
M24×1.5 22.50 22.676 22.376
M24×1.0 23.00 23.153 22.917
M25×2.0 23.00 23.210 22.835
M25×1.5 23.50 23.676 23.376
M25×1.0 24.00 24.153 23.917
M26×1.5 24.50 24.676 24.376
M27×2.0 25.00 25.210 24.835
M27×1.5 25.50 25.676 25.376
M27×1.0 26.00 26.153 25.917
M28×2.0 26.00 26.210 25.835
M28×1.5 26.50 26.676 26.376
M28×1.0 27.00 27.153 26.917
M30×3.0 27.00 27.252 26.752
M30×2.0 28.00 28.210 27.835
M30×1.5 28.50 28.676 28.376
M30×1.0 29.00 29.153 28.917
M32×2.0 30.00 30.210 29.835
M32×1.5 30.50 30.676 30.376
M33×3.0 30.00 30.252 29.752
M33×2.0 31.00 31.210 30.835
M33×1.5 31.50 31.376 31.376
M35×1.5 33.50 33.676 33.376
M36×3.0 33.00 33.252 32.752
M36×2.0 34.00 34.210 33.835
M36×1.5 34.50 34.676 34.376

 

規格(UNF) 標準徑 2級牙鉆孔徑
最大 最小
番數牙外徑
NO.0-80(1.524) 1.25 1.305 1.182
NO.1-72(1.854) 1.55 1.612 1.474
NO.2-64(2.184) 1.85 1.912 1.756
NO.3-56(2.515) 2.10 2.197 2.025
NO.4-48(2.845) 2.40 2.458 2.271
NO.5-44(3.175) 2.70 2.740 2.551
NO.6-40(3.505) 2.90 3.022 2.820
NO.8-36(4.166) 3.50 3.606 3.404
NO.10-32(4.826) 4.10 4.165 3.963
NO.12-28(5.846) 4.60 4.724 4.496
1/4 -28 5.50 5.588 5.360
5/16 -24 6.90 7.035 6.782
3/8 -24 8.50 8.636 8.382
7/16 -20 9.90 10.033 9.729
1/2 -20 11.50 11.607 11.329
9/16 -18 12.90 13.081 12.751
5/8 -18 14.50 14.681 14.351
3/4 -16 17.50 14.678 17.323
7/8 -14 20.50 20.675 20.270
1 -12 23.20 23.571 23.114
1-1/8 -12 26.50 26.746 26.289
1-1/4 -12 29.50 29.921 29.464
1-3/8 -12 32.80 33.096 32.464
1-1/2 -12 36.00 36.270 35.814

 

規格 精度等級
RH4.5.6 RH7.8 RH9
M1.0×0.25 0.86 0.88
M1.1×0.25 0.96 0.98
M1.2×0.25 1.06 1.08
M1.4×0.3 1.24 1.25
M1.6×0.35 1.41 1.43
M1.7×0.35 1.51 1.53
M1.8×0.35 1.61 1.63
M2.0×0.4 1.78 1.80
M2.2×0.45 1.95 1.98
M2.3×0.4 2.08 2.10
M2.5×0.45 2.25 2.28
M2.6×0.45 2.35 1.38
M3.0×0.5 2.73 2.75
M3.0×0.6 3.17 3.20
M4.0×0.7 3.62 3.65 3.69
M5.0×0.8 4.56 4.60 4.64
M6.0×1.0 5.45 5.50 5.55
M7.0×1.0 6.45 6.50 6.55
M8.0×1.25 7.31 7.38 7.44
M10×1.5 9.18 9.25 9.32
M10×1.25 9.31 9.38 9.44
M12×1.75 11.04 11.12 11.21
M12×1.25 11.31 11.38 11.44
注:無槽絲攻之鉆孔徑,在上表所列之數值,由于被加工材料之材質、硬度、形狀、尺寸等之影響,多少會有所變動,因此參考上表之同時,亦請增減若干。

 

規格(UNEF) 標準徑 2級牙鉆孔徑
最大 最小
NO.12 -32 4.70 4.826 4.623
1/4 -32 5.60 5.690 5.486
5/16 -32 7.10 7.264 7.087
3/8 -32 8.70 8.865 8.661
7/16 -28 10.20 10.338 10.135
1/2 -28 11.80 11.938 11.709
9/16 -28 13.20 13.386 13.132
5/8 -24 14.80 14.986 14.732
3/4 -20 17.80 17.958 17.678
7/8 -20 21.00 21.133 20.853
1 -20 24.00 24.308 24.028

 

規格(UNC) 標準徑 2級牙鉆孔徑
番數牙外徑 最大 最小
NO.1-64(1.854) 1.55 1.582 1.425
NO.2-56(2.184) 1.80 1.871 1.695
NO.3-48(2.515) 2.10 2.146 1.941
NO.4-40(2.845) 2.30 2.385 2.157
NO.5-40(3.175) 2.60 2.697 2.487
NO.6-32(3.505) 2.80 2.895 2.642
NO.8-32(4.166) 3.40 3.530 3.302
NO.10-24(4.826) 3.90 3.962 3.682
NO.12-24(5.846) 4.50 4.597 4.344
1/4 -20 5.10 5.257 4.979
5/16 -18 6.60 6.731 6.401
3/8 -16 8.00 8.153 7.987
7/16 -14 9.40 9.500 9.144
1/2 -13 10.80 11.023 10.592
9/16 -12 12.20 12.446 11.989
5/8 -11 13.60 12.868 13.386
3/4 -10 16.20 16.840 16.307
7/8 -9 19.50 19.761 19.177
1 -8 22.20 22.606 21.971
1-1/8 -7 25.00 25.349 24.638
1-1/4 -7 28.20 28.524 27.813
1-3/8 -6 30.80 31.115 30.353
1-1/2 -6 34.00 34.290 33.528
1-3/4 -5 39.50 39.827 38.964
2 -4-1/2 45.20 45.593 44.679

 

規格 鉆孔徑
硬材 軟材
W1/8 – 40 2.65 2.60
W5/32 – 32 3.25 3.20
W3/16 – 24 3.75 3.70
W1/4 – 20 5.10 5.00
W5/16 – 18 6.60 6.50
W3/8 – 16 8.00 7.90
W7/16 – 14 9.40 9.30
W1/2 – 12 10.70 10.50
W9/16 – 12 12.30 12.00
W5/8 – 11 13.70 13.50
W3/4 – 10 16.70 16.50
W7/8 – 9 19.50 19.30
W1 – 8 22.40 22.00
W1-1/8 – 7 25.00 24.80
W1-1/4 – 7 28.30 28.00

 

規格 標準徑 鉆孔徑
最大 最小
PS1/16 -28 6.50 6.632 6.490
PS1/8 -28 8.50 8.637 8.495
PS1/4 – 19 11.40 11.549 11.341
PS3/8 – 19 15.00 15.054 14.846
PS1/2 – 14 18.50 18.773 18.489
PS3/4 – 14 24.00 24.259 23.975
PS1 – 11 30.20 30.471 30.111
PS1-1/4 -11 38.80 39.132 38.772
PS1-1/2 -11 44.80 45.025 44.665
PS2 – 11 56.50 56.836 56.476

 

規格 標準徑 有效牙部之長度(最小)中之母螺牙內徑 標準長度(最小)中之母螺牙內徑
使用絞刀時 不用絞刀時
PT1/16 -28 6.10 6.2 6.244 6.384
PT1/8 -28 8.10 8.2 8.249 8.388
PT1/4 -19 10.70 11 10.962 11.174
PT3/8 -19 14.20 14.5 14.448 14.658
PT1/2 -14 17.60 18 17.979 18.263
PT3/4 -14 23.00 23.5 23.378 23.663
Pt1 -11 29.00 29.5 29.459 29.822
PT1-1/4 -11 37.50 38 37.976 38.339
PT1-1/2 -11 43.40 44 43.869 44.232
Pt2 -11 54.90 55.5 55.412 55.844

 

規格 鉆孔徑
NPT NPS
使用絞刀時 不用絞刀時
1/16 -27 6.1 6.25 6.35
1/8 -27 8.33 8.43 8.74
1/4 -18 10.72 11.13 11.13
3/8 -18 14.27 14.27 14.68
1/2 -14 17.48 17.86 18.26
3/4 -14 22.63 23.01 23.42
1 -11-1/2 28.58 28.98 29.36
1-1/4-11-1/2 37.31 37.69 38.1
1-1/2-11-1/2 43.66 44.04 44.45
2 -11-1/2 55.58 55.96 56.36

 

規格 滾造徑
W 3/16 – 24 4.08 – 4.05
W 1/4 – 20 5.51 – 5.46
W 5/16 – 18 7.01 – 6.95
W 3/8 – 16 8.48 – 8.41
W 7/16 – 14 9.92 – 9.85
W 1/2 – 12 11.31 – 11.24
W 9/16 -12 12.89 – 12.82

 

規格 滾造徑
M3.0×0.5 2.63 2.60
M3.0×0.6 2.56 2.53
M3.5×0.6 3.06 3.03
M4.0×0.7 3.49 3.45
M4.0×0.75 3.45 3.41
M4.5×0.75 3.96 3.92
M5.0×0.8 4.43 4.38
M5.0×0.9 4.36 4.31
M6.0×1.0 5.30 5.25
M7.0×1.0 6.30 6.25
M8.0×1.0 7.28 – 7.23
M8.0×1.25 7.12 – 7.07
M9.0×1.25 8.12 – 8.07
M10×1.25 9.10 – 9.04
M10×1.5 8.97 – 8.91
M11×1.5 9.97 – 9.91
M12×1.5 10.92 – 10.87
M12×1.75 10.79 – 10.73
M14×2.0 12.63 – 12.56
M16×2.0 14.63 – 14.56
M18×2.5 16.31 – 16.23
M20×2.5 18.31 – 18.23
M22×2.5 20.31 – 20.23

 

規格(UNC) 滾造徑
SM 1/8 40 2.735 -2.688
SM 1/8 44 2.769 -2.722
SM 9/64 40 3.128 -3.083
SM 11/64 40 3.855 -3.805
SM 3/16 32 4.205 -4.155
SM 3/16 28 4.143 -4.093
SM 7/32 32 5.003 -4.955
SM 15/64 28 5.325 -4.955
SM 1/4 40 5.890 -5.735
SM 1/4 28 5.721 -5.366
SM 9/32 28 6.528 -6.648
SM 11/32 28 8.092 -8.432
SM 3/8 29 8.880 -8.015
SM 7/16 30 10.466 -10.401
SM 7/16 16 10.037 -9.967
SM 1/2 20 11.819 -11.749
SM 9/16 20 13.400 -13.425

 

規格(UNC) 滾造徑
NO.5-40 2.70 – 2.67
NO.6-32 2.95 – 2.91
NO.8-32 3.60 – 3.57
NO.10-24 4.09 – 4.05
NO.12-24 4.75 – 4.70
1/4 -20 5.50 – 5.45
5/16 -18 6.98 – 6.93
3/8 -16 8.45 – 8.40
7/16 -14 9.89 – 9.83
1/2 -13 11.39 – 11.32
9/16 -12 12.87 – 12.80

 

規格(UNF) 滾造徑
NO.5-44 2.73 – 2.70
NO.6-40 3.05 – 3.02
NO.8-36 3.66 – 3.63
NO.10-32 4.26 – 4.80
NO.12-28 4.84 – 4.80
1/4 -28 5.72 – 5.68
5/16 -24 7.20 – 7.16
3/8 -24 8.79 – 8.74
7/16 -20 10.23 – 10.18
1/2 -20 11.82 – 11.76
一区二三区高中清