螺纹攻牙底孔参数
攻牙底孔的使用参数表
一、螺紋下孔徑表
1、公制粗牙螺紋JIS B 0209-1982(單位：mm)
螺纹尺寸钻头直径螺纹下孔徑內螺紋小徑
最小直径最大直径
M1×0.25 0.75 0.78 (80%) 0.729 0.785 1.1 ×0.25 0.85 0.88 (80%) 0.829 0.885 1.2 ×0.25 0.95 0.98 (80%) 0.929 0.985 1.4 ×0.3 1.1 1.14 (80%) 1.075 1.142 1.6 ×0.35 1.25 1.32 (75%) 1.221 1.321 1.8 ×0.35 1.45 1.52 (75%) 1.421 1.521 2×0.4 1.6 1.65 (80%) 1.567 1.679 2.2 ×0.45 1.75 1.83 (75%) 1.713 1.838 2.5 ×0.45 2.1 2.13 (75%) 2.013 2.138 3×0.5 2.5 2.59 (75%) 2.459 2.599 3.5 ×0.6 2.9 3.01 (75%) 2.850 3.010 4×0.7 3.3 3.39 (80%) 3.242 3.422 4.5 ×0.75 3.8 3.85 (80%) 3.688 3.878 5×0.8 4.2 4.31 (80%) 4.134 4.334 6×1 5 5.13 (80%) 4.917 5.153 7×1 6 6.13 (80%) 5.917 6.153 8×1.25 6.8 6.85 (85%) 6.647 6.912 9×1.25 7.8 7.85 (85%) 7.647 7.912 10×1.5 8.5 8.62 (85%) 8.376 8.676 11×1.5 9.5 9.62 (85%) 9.376 9.676 12×1.75 10.3 10.40 (85%) 10.106 10.441 14×2 12 12.2 (85%) 11.835 12.210 16×2 14 14.2 (85%) 13.835 14.210 18×2.5 15.5 15.7 (85%) 15.294 15.744 20×2.5 17.5 17.7 (85%) 17.294 17.744 22×2.5 19.5 19.2 (85%) 19.294 19.744 24×3 21 21.2 (85%) 20.752 21.252 27×3 24 24.2 (85%) 23.752 24.252 30×3.5 26.5 26.6 (90%) 26.211 26.771 33×3.5 29.5 29.6 (90%) 29.211 29.771 36×4 32 32.1 (90%) 31.670 32.270 39 ×4 35 35.1 (90%) 34.670 35.270 42 ×4.5 37.5 37.6 (90%) 37.129 37.799 45 ×4.5 40.5 40.6 (90%) 40.129 40.799 48 ×5 43 43.1 (90%) 42.587 43.297 註(1)M1.4以下等級：5H、M1.6以上等級：6H (2)基於JIS B 0209-1982標準
2、公制細牙螺紋-01JIS B 0211-1982(單位：mm)
螺纹尺寸钻头直径螺纹下孔徑內螺紋小徑
最小直径最大直径
M2.5 ×0.35 2.2 2.22 (75%) 2.121 2.221
3×0.35 2.7 2.72 (75%) 2.621 2.721
3.5 ×0.35 3.2 3.22 (75%) 3.121 3.221
4×0.5 3.5 3.59 (75%) 3.459 3.599
4.5 ×0.5 4 4.09 (75%) 3.959 4.099
5×0.5 4.5 4.59 (75%) 4.459 4.599
5.5 ×0.5 5 5.09 (75%) 4.959 5.099
6×0.75 5.3 5.35 (80%) 5.188 5.378
7×0.75 6.3 6.35 (80%) 6.188 6.378
8×1 7 7.13 (80%) 6.917 7.153
8×0.75 7.3 7.35 (80%) 7.188 7.378
9×1 8 8.13 (80%) 7.917 8.153
9×0.75 8.3 8.35 (80%) 8.188 8.378
10×1.25 8.8 8.85 (85%) 8.647 8.912
10×1 9 9.13 (80%) 8.917 9.153
10×0.75 9.3 9.35 (80%) 9.188 9.378
11 ×1 10 10.13 (80%) 9.917 10.153
11 ×0.75 10.3 10.35 (80%) 10.188 10.378
12 ×1.5 10.5 10.62 (85%) 10.376 10.676
12 ×1.25 10.8 10.85 (85%) 10.647 10.912
12 ×1 11 11.13 (80%) 10.917 11.153
14 ×1.5 12.5 12.62 (85%) 12.376 12.676
14 ×1 13 13.13 (80%) 12.917 13.153
15 ×1.5 13.5 13.62 (85%) 13.376 13.676
15 ×1 14 14.13 (80%) 13.917 14.153
16 ×1.5 14.5 14.62 (85%) 14.376 14.676
16 ×1 15 15.13 (80%) 14.917 15.153
17 ×1.5 15.5 15.62 (85%) 15.376 15.676
17 ×1 16 16.13 (80%) 15.917 16.153
18 ×2 16 16.2 (85%) 15.835 16.210
18 ×1.5 16.5 16.62 (85%) 16.376 16.676
18 ×1 17 17.13 (80%) 16.917 17.153
20 ×2 18 18.2 (85%) 17.835 18.210
20 ×1.5 18.5 18.62 (85%) 18.376 18.676
20 ×1 19 19.13 (80%) 18.917 19.153
22 ×2 20 20.2 (85%) 19.835 20.210
22 ×1.5 20.5 20.62 (85%) 20.376 20.676
22 ×1 21 21.13 (80%) 20.917 21.153
24 ×2 22 22.2 (85%) 21.835 22.210
24 ×1.5 22.5 22.62 (85%) 22.376 22.676
24 ×1 23 23.13 (80%) 22.917 23.153
25 ×2 23 23.2 (85%) 22.835 23.210
25 ×1.5 23.5 23.62 (85%) 23.376 23.676
25 ×1 24 24.13 (80%) 23.917 24.153
公制細牙螺紋-02JIS B 0211-1982(單位：mm)螺纹尺寸钻头直径螺纹下孔徑內螺紋小徑
最小直径最大直径M26 ×1.5 24.5 24.62 (85%) 24.376 24.676 27 ×2 25 25.2(85%) 24.835 25.210 27 ×1.5 25.5 25.62 (85%) 25.376 25.676
27 ×1 26 26.13 (80%) 25.917 26.153
28 ×2 26 26.2(85%) 25.835 26.210 28 ×1.5 26.5 26.62 (85%) 26.376 26.676 28 ×1 27 27.13 (80%) 26.917 27.153 30 ×3 27 27.2 (85%) 26.752 27.252 30 ×2 28 28.2 (85%) 27.835 28.210 30 ×1.5 28.5 28.62 (85%) 28.376 28.676 30 ×1 29 29.13 (80%) 28.917 29.153 32 ×2 30 30.2 (85%) 29.835 30.210
32 ×1.5 30.5 30.62 (85%) 30.376 30.676
33 ×3 30 30.2 (85%) 29.752 30.252 33 ×2 31 31.2 (85%) 30.835 31.210 33 ×1.5 31.5 31.62 (85%) 31.376 31.676
35 ×1.5 33.5 33.62 (85%) 33.376 33.676
36 ×3 33 33.2 (85%) 32.752 33.252 36 ×2 34 34.2 (85%) 33.835 34.210 36 ×1.5 34.5 34.62 (85%) 34.376 34.676
38 ×1.5 36.5 36.62 (85%) 36.376 36.676
39 ×3 36 36.2 (85%) 35.752 36.252 39 ×2 37 37.2 (85%) 36.835 37.210
39 ×1.5 37.5 37.62 (85%) 37.376 37.676
40 ×3 37 37.2 (85%) 36.752 37.252 40 ×2 38 38.2 (85%) 37.835 38.210 40 ×1.5 38.5 38.62 (85%) 38.376 38.676 42 ×4 38 38.1 (90%) 37.670 38.270 42 ×3 39 39.2 (85%) 38.752 39.252 42 ×2 40 40.2 (85%) 39.835 40.210 42 ×1.5 40.5 40.62 (85%) 40.376 40.676 45 ×4 41 41.1 (90%) 40.670 41.270 45 ×3 42 42.2 (85%) 41.752 42.252 45 ×2 43 43.2 (85%) 42.835 43.210 45 ×1.5 43.5 43.62 (85%) 43.376 43.676 48 ×4 44 44.1 (90%) 43.670 44.270 48 ×3 45 45.2 (85%) 44.752 45.252 48 ×2 46 46.2 (85%) 45.835 46.210
48 ×1.5 46.5 46.62 (85%) 46.376 46.676 50 ×3 47 47.2 (85%) 46.752 47.252 50 ×2 48 48.2 (85%) 47.835 48.210 50 ×1.5 48.5 48.62 (85%) 48.376 48.676 註(1)等級：6H
(2)基於JIS B 0211-1982標準
3、美制粗牙螺紋(單位：mm)
螺纹尺寸钻头直径2B级螺纹下孔徑內螺紋小徑
最小直径最大直径NO.1 -64UNC 1.55 1.57 (65%) 1.425 1.582
2 -56 1.8 1.86 (65%) 1.695 1.871
3 -48 2.1 2.1
4 (65%) 1.941 2.146
4 -40 2.3 2.36 (70%) 2.157 2.385
5 -40 2.
6 2.69 (70%) 2.48
7 2.697
6 -32 2.8 2.86 (75%) 2.642 2.895
8 -32 3.4 3.52 (75%) 3.302 3.530
10 -24 3.9 3.91 (80%) 3.683 3.962
12 -24 4.5 4.57 (80%) 4.344 4.597
1/4 -20 5.1 5.25 (80%) 4.979 5.257 5/16-18 6.6 6.72 (80%) 6.401 6.731 3/8 -16 8 8.15 (80%) 7.798 8.153 7/16 -14 9.4 9.50 (80%) 9.144 9.550 1/2 -13 10.8 11.0 (80%) 10.592 11.023 9/16 -12 12.2 12.3 (85%) 11.989 12.446 5/8-11 13.6 13.8 (85%) 13.386 13.868 3/4-10 16.5 16.8 (80%) 16.307 16.840 7/8-9 19.5 19.6 (85%) 19.177 19.761 1 -8 22.2 22.5 (85%) 21.971 22.606
11/8 -7 25 25.2 (85%) 24.638 25.349 11/4 -7 28.2 28.4 (85%) 27.813 28.524 13/8 -6 30.8 31.0 (85%) 30.353 31.115 11/2 -6 34 34.2 (85%) 33.528 34.290 13/4 -5 39.5 39.8 (85%) 38.964 39.827
2 - 4 45.2 45.
3 (90%) 44.679 45.593 4、美制細牙螺紋(單位：mm)
螺纹尺寸钻头
直径2B级螺纹下孔徑內螺紋小徑
最小直径最大直径
NO.0-80UNF 1.25 1.30 (65%) 1.182 1.305
1 -7
2 1.55 1.61 (65%) 1.474 1.612
2 -64 1.85 1.90 (65%) 1.756 1.912
3 -56 2.1 2.17 (70%) 2.025 2.197
4 -48 2.4 2.44 (70%) 2.271 2.458
5 -44 2.7 2.74 (70%) 2.551 2.740
6 -40 2.9 3.02 (70%) 2.820 3.022
8 -36 3.5 3.59 (75%) 3.404 3.606
10 -32 4.1 4.14 (80%) 3.963 4.165
12 -28 4.6 4.70 (80%) 4.496 4.724
1/4 -28 5.5 5.56 (80%) 5.360 5.588
5/16-24 6.9 7.02 (80%) 6.782 7.035
3/8 -24 8.5 8.61 (80%) 8.382 8.636
7/16-20 9.9 10.01 (80%) 9.729 10.033
1/2 -20 11.5 11.60 (80%) 11.329 11.607
9/16 -18 12.9 13.07 (80%) 12.751 13.081
5/8 -18 14.5 14.65 (80%) 14.351 14.681
3/4 -16 17.5 17.59 (85%) 17.323 17.678
7/8 -14 20.5 20.6(85%) 20.270 20.675
1-12 23.2 23.5(85%) 23.114 23.571
1 1/8 -1
2 26.5 26.7(80%) 26.289 26.746
1 1/4 -1
2 29.5 29.9(80%) 29.464 29.921
1 3/8 -1
2 32.8 33.0(85%) 32.639 33.096
1 1/
2 -12 36 36.2(85%) 35.814 36.271
5、英制粗牙螺紋(單位：mm)
螺紋尺寸下孔徑嵌合率
A列(硬材
質) B列(軟材
質)
A列直徑B列直徑內螺紋最
小徑
內螺紋最
大徑
W 1/8 2.6 2.5 70.7 83.0 70.0 88.3 3/16 3.7 3.6 78.4 85.8 70.0 88.3 1/4 5.1 5.0 76.9 83.0 70.5 88.3 5/16 6.6 6.5 74.0 99.5 70.1 88.4 3/8 8.0 7.9 75.0 80.0 69.5 88.2 7/16 9.4 9.3 73.7 80.0 69.0 88.8 1/2 10.7 10.5 73.8 81.2 69.0 88.2 9/16 12.3 12.0 73.4 84.4 69.0 88.2 5/8 13.7 13.5 73.5 80.3 69.6 88.5 3/4 16.7 16.5 72.3 78.4 69.6 88.3 7/8 19.5 19.3 75.4 80.9 70.1 88.4 1 22.4 22.0 73.8 83.6 71.0 88.2 1 1/8 25.0 24.8 76.9 81.3 72.0 88.4 1 1/4 28.3 28.0 74.3 80.7 72.0 88.4 1 3/8 30.5 30.3 81.6 85.3 73.8 88.6 1 1/2 33.8 33.5 79.3 84.8 73.8 88.6 1 5/8 36.0 35.7 81.1 85.7 74.8 88.3 1 3/4 39.2 39.0 80.7 83.8 74.8 88.3
1 7/8 41.8 41.5 80.6 84.7 74.7 88.4
2 45.0 44.7 80.2 84.4 74.7 88.4
6、英制管用螺紋(單位：mm)
管用螺紋
尺寸
JIS B 0203JIS B 2301
錐管內螺紋Rc(PT) 平行內螺紋Rp(PS) 錐管內螺紋
計算值下孔徑計算值下孔徑計算值下孔
徑
1/16 6.230 6.2 6.490 6.5 －－1/8 8.235 8.2 8.495 8.5 8.191 8.2 1/4 10.941 10.9 11.341 11.4 10.945 10.9 3/8 14.428 14.4 14.846 14.9 14.388 14.4 1/2 17.950 18 18.489 18.5 17.943 18 3/4 23.349 23 23.975 24 23.305 23 1 29.423 29 30.111 30 29.353 29 1 1/4 37.940 38 38.772 39 37.890 38
1 1/
2 43.83
3 4
4 44.56
5 45 43.720 43
2 55.412 55 56.476 56 55.406 55
2 1/2 70.701 71 72.009 72 70.788 70
3 83.201 83 84.709 85 83.36
4 83
3 1/2 95.547 96 97.155 97 95.747 95
4 107.834 108 109.85
5 110 108.322 108
5 133.110 133 135.255 135 133.597 133
6 158.510 159 160.655 161 158.810 158
7 183.360 183 185.954 186
8 208.560 209 211.354 212
9 233.960 234 236.754 237
10 259.166 259 262.154 262
12 309.747 310 312.875 313
7、美制管用耐密斜行螺紋(NPTF?NPSF) (單位：mm)
管用螺紋
尺寸斜行螺紋(NPTF)平行螺紋(NPSF)
鑽頭直徑鑽頭直徑
使用鉸刀場合不使用鉸刀
場合
1/16 －0.234 ( 5.94) 0.246 ( 6.25) 1/4 0.250 ( 6.35)
1/8 21/64 0.328 ( 8.33) 0.339 ( 8.61) 11/32 0.344 ( 8.74)
1/4 27/64 0.422 (10.72) 7/16 0.438 (11.13) －0.444 (11.28)
3/8 9/16 0.562 (14.27) 37/64 0.578 (14.68) 37/64 0.578 (14.68)
1/2 11/16 0.688 (17.48) 45/64 0.703 (17.86) 23/32 0.719 (18.26)
3/4 57/64 0.891 (22.63) 59/64 0.922 (23.42) －0.922 (23.42)
1 1 1/8 1.125 (28.58) 1
5/32
1.156 (29.36) 1 5/32 1.156 (29.36)
1 1/4 1 15/3
2 1.469 (37.31) 1
1/2
1.500 (38.10) －－
1 1/
2 1 45/64 1.70
3 (43.26) 1
47/64
1.734 (44.04) －－
2 2 3/16 2.188 (55.58) 2
7/32
2.219 (56.36) －－
2 1/2 2 19/32 2.594 (65.89) 2
41/64
2.641 (67.08) －－
上述鑽頭直徑來源於美制管用耐密斜行螺紋ANSI B1.20.3—1957 Dryseal Pipe Threads (Inch)標準
8、公制螺紋(NRT) (單位：mm)螺紋尺寸1級螺紋用下孔徑2級螺紋用下孔徑
RH 精度最小～最大
(嵌合率％)
RH
精度
最小～最大
(嵌合率％)
M 1×0.25 2 0.87 ~ 0.89(100~85) 4 0.90 ~0.92 (100~80) 1.1×0.25 2 0.97 ~ 0.99(100~85) 4 1.00 ~1.02 (100~80) 1.2×0.25 2 1.07 ~ 1.09(100~85) 4 1.10 ~1.12 (100~80) 1.4×0.3 2 1.244~ 1.263
(100~85)
4 1.270~1.294 (100~80)
1.7×0.35 2 1.51 ~ 1.54(100~80) 4 1.54 ~ 1.58 (100~75)
2 ×0.4 2 1.78 ~ 1.82(100~80) 4 1.81 ~ 1.85 (100~75) 2.3×0.4 2 2.08 ~ 2.12(100~80) 4 2.11 ~ 2.15 (100~75) 2.5×0.45 2 2.25 ~ 2.29(100~80) 4 2.28 ~ 2.3
3 (100~75)
2.6×0.45 2 2.35 ~ 2.39(100~80) 4 2.38 ~ 2.43 (100~75)
3 ×0.5 3 2.7
4 ~ 2.78(100~80)
5 2.7
6 ~ 2.81 (100~75)
3.5×0.6 3 3.18 ~ 3.21(100~85) 5 3.20 ~ 3.26 (100~75)
4 ×0.7 4 3.63 ~ 3.67(100~85) 6 3.6
5 ~ 3.70 (100~85)
5 ×0.8 4 4.57 ~ 4.62(100~85)
6 4.59 ~ 4.66 (100~80)
6 ×1 4 5.45 ~ 5.51(100~85)
7 5.4
8 ~ 5.57 (100~80)
7 ×1 4 6.45 ~ 6.51(100~85) 7 6.48 ~ 6.57 (100~80)
8 ×1.25 5 7.31 ~ 7.38(100~85) 7 7.34 ~ 7.41 (100~85) 8 ×1 4 7.45 ~ 7.51(100~85) 7 7.48 ~ 7.57 (100~80) 10 ×1.5 5 9.16 ~ 9.22(100~90) 7 9.18 ~ 9.28 (100~85) 10 ×1.25 5 9.31 ~ 9.38(100~85) 7 9.34 ~ 9.41 (100~85) 10 ×1 5 9.46 ~ 9.52(100~85) 7 9.48 ~ 9.57 (100~80)
12 ×1.75 5 11.01 ~11.08
(100~90) 8 11.05 ~11.15
(100~85)
12 ×1.5 5 11.16 ~11.22
(100~90) 7 11.18 ~11.28
(100~85)
12 ×1.25 5 11.31 ~11.38
(100~85) 7 11.34 ~11.41
(100~85)
12 ×1 5 11.46 ~11.52
(100~85) 7 11.48 ~11.57
(100~80)
14 ×2 6 12.83 ~12.95
(100~90) 10 12.92 ~13.04
(100~85)
14 ×1.5 5 13.16 ~13.22
(100~90) 9 13.21 ~13.30
(100~85)
16 ×2 6 14.87 ~14.95
(100~90) 10 14.92 ~15.04
(100~85)
16 ×1.5 5 15.16 ~15.22
(100~90) 9 15.21 ~15.30
(100~80)
18 ×2.5 6 16.57 ~16.67
(100~90) 11 16.63 ~16.78
(100~85)
18 ×1.5 6 17.17 ~17.23
(100~90) 10 17.22 ~17.31
(100~85)
20 ×2.5 6 18.57 ~18.67
(100~90) 11 18.63 ~18.78
(100~85)
20 ×1.5 6 19.17 ~19.23
(100~90) 10 19.22 ~19.31
(100~85)
9、美制粗牙螺紋(NRT) (單位：mm)
螺紋尺寸2B級螺紋用下孔徑3B級螺紋用下孔徑
RH 精度最小～最大
(嵌合率％)
RH
精度
最小～最大
(嵌合率％)
NO.2-
56UNC 4 1.96 ~ 2.02 (100~65) 3 1.95 ~ 2.01 (100~65) 3-48 4 2.25 ~ 2.32 (100~65) 3 2.23 ~ 2.31 (100~65) 4-40 5 2.52 ~ 2.60 (100~70) 3 2.50 ~ 2.58 (100~70) 5-40 5 2.86 ~ 2.93 (100~70) 3 2.83 ~ 2.91 (100~70) 6-32 5 3.09 ~ 3.17 (100~75) 3 3.06 ~ 3.14 (100~75) 8-32 6 3.75 ~ 3.83 (100~75) 4 3.74 ~ 3.82 (100~75) 10-24 6 4.26 ~ 4.35 (100~80) 4 4.24 ~ 4.32 (100~80) 12-24 6 4.92 ~ 5.01 (100~80) 4 4.90 ~ 4.96 (100~85) 1/4 -20 6 5.66 ~ 5.76 (100~80) 4 5.64 ~ 5.74 (100~80) 5/16 -18 7 7.18 ~7.29 (100~80) 5 7.15 ~7.24 (100~85) 3/8 -16 7 8.66 ~8.78 (100~80) 5 8.63 ~8.73 (100~85)
7/16 -14 7 10.11 ~10.25
(100~80) 5 10.08 ~10.19 (100~85)
1/2 -13 8 10.62 ~11.78
(100~80) 6 11.60 ~11.68 (100~90)
9/16 -12 10 13.14 ~13.27
(100~85) 8 13.11 ~13.24 (100~85)
5/8 -11 11 14.62 ~14.76
(100~85) 8 14.58 ~14.67 (100~90)
3/4 -10 12 17.67 ~17.88
(100~80) 9 17.63 ~17.74 (100~90)
7/8 - 9 12 20.68 ~20.85
(100~85) 9 20.64 ~20.75 (100~90)
1 - 8 13 23.65 ~23.84
(100~85) 10 23.61 ~23.74 (100~90)
二、螺紋下孔徑表(無屑絲攻用)
1、美制細牙螺紋(NRT) (單位：mm)
螺紋尺寸2B級螺紋用下孔徑3B級螺紋用下孔徑
RH 精度最小～最大
(嵌合率％)
RH
精度
最小～最大
(嵌合率％)
NO.2-64UNF 3 1.98 ~ 2.04 (100~65) 2 1.97 ~ 2.03 (100~65) 3-56 4 2.29 ~ 2.35 (100~65) 3 2.28 ~ 2.34 (100~65)
4-48 4 2.57 ~ 2.64 (100~70) 3 2.56 ~ 2.63 (100~70)
5-44 4 2.88 ~ 2.95 (100~70) 3 2.87 ~ 2.94 (100~70)
6-40 5 3.19 ~ 3.26 (100~70) 3 3.16 ~ 3.22 (100~75)
8-36 5 3.80 ~ 3.88 (100~75) 4 3.79 ~ 3.86 (100~75) 10-32 5 4.41 ~ 4.48 (100~80) 4 4.40 ~ 4.46 (100~80) 12-28 5 5.00 ~ 5.08 (100~80) 4 4.99 ~ 5.06 (100~80) 1/4-28 5 5.86 ~ 5.93 (100~80) 4 5.85 ~ 5.92 (100~80) 5/16-24 6 7.38 ~7.46 (100~80) 5 7.36 ~7.43 (100~85) 3/8 -24 6 8.96 ~9.05 (100~80) 5 8.95 ~9.02 (100~85) 7/16-20 7 10.44 ~10.54 (100~80) 5 10.41 ~10.49 (100~85)
1/2-20 7 12.02 ~12.12 (100~80) 5 12.00 ~12.05 (100~90) 9/16-18 9 13.55 ~13.66 (100~80) 7 13.53 ~13.58 (100~90) 5/8 -18 9 15.14 ~15.25 (100~80) 7 15.11 ~15.17 (100~90) 3/4 -16 10 18.22 ~18.32 (100~85) 7 18.18 ~18.25 (100~90) 7/8 -14 11 21.27 ~21.38 (100~85) 8 21.23 ~21.27 (100~95)
1 - 1
2 12 24.28 ~24.41 (100~85) 9 24.24 ~24.32 (100~90)
2、英制管用平行螺紋(NRT) (單位：mm)
螺紋尺寸RH精度最小～最大(嵌合率％)
PF 1/8 6 9.24~9.35 (100~80)
1/4 7 12.41~12.62 (100~75)
3/8 7 15.92~16.12 (100~75)
1/2 8 19.93~20.15 (100~80)
3/4 8 25.41~25.64 (100~80)
3、公制螺紋(HRT) (單位：mm)
螺紋尺寸1級螺紋用下孔徑2級螺紋用下孔徑
RH 精度最小～最大
(嵌合率％)
RH
精度
最小～最大
(嵌合率％)
M 1×0.25 2 0.858~0.879
(100~85)
4 0.858~0.887 (100~80)
1.2×0.25 2 1.058~1.079
(100~85)
4 1.058~1.087 (100~80) 1.4×0.3 2 1.23 ~1.26 (100~85) 4 1.23 ~1.26 (100~80) 1.6×0.3
5 2 1.40 ~1.44 (100~80) 4 1.40 ~1.45 (100~75) 1.7×0.35 － 1.50 ~1.54 (100~80) 4 1.50 ~1.55 (100~75)
1.8×0.35 2 1.60 ~1.64 (100~80) 4 1.60 ~1.65 (100~75)
2 ×0.4 2 1.77 ~1.82 (100~80) 4 1.77 ~1.82 (100~80) 2 ×0.25 2 1.858~1.887
(100~80)
－ 1.858~1.887 (100~80) 2.3×0.4 － 2.07 ~2.12 (100~80) 4 2.07 ~2.13 (100~75) 2.5×0.45 3 2.24 ~2.30 (100~80) 5 2.24 ~2.31 (100~75)
2.6×0.45 － 2.34 ~2.40 (100~80) 5 2.34 ~2.41 (100~75)
3 ×0.6 3 2.72 ~2.73 (100~90) 5 2.66 ~2.73 (100~90) 3 ×0.5 5 2.72 ~2.77 (100~80) 6 2.72 ~2.78 (100~75)
3 ×0.35 3 2.80 ~2.8
4 (100~80)
5 2.80 ~2.85 (100~75)
3.5×0.6 3 3.16 ~3.21 (100~85) 5 3.16 ~3.25 (100~75)
4 ×0.7
5 3 3.57 ~3.64 (100~85)
6 3.5
7 ~3.64 (100~85) 4 ×0.7 6 3.60 ~3.66 (100~85) 7 3.60 ~3.66 (100~85)
4 ×0.
5 3 3.71 ~3.77 (100~80)
6 3.71 ~3.79 (100~75)
5 ×0.9 3 4.49 ~4.59 (100~85) 7 4.49 ~4.59 (100~85) 5 ×0.8 3 4.55 ~4.62 (100~85) 8 4.55 ~4.64 (100~80)
5 ×0.5 3 2.72 ~4.77 (100~80)
6 4.72 ~4.79 (100~75)
6 ×1 4 5.43 ~5.52 (100~85)
7 5.43 ~5.55 (100~80) 6 ×0.75 3 5.57 ~5.64 (100~85) 7 5.57 ~5.66 (100~80)
4、公制粗牙螺紋HL-NRT (單位：mm)
螺紋尺寸RH精度最小～最大(嵌合率％) M 3 ×0.5 3 3.39~3.43 (100~80)
4 ×0.7 4 4.54~4.58 (100~85)
5 ×0.8 4 5.61~5.6
6 (100~85)
6 ×1 4 6.75~6.81 (100~85) 8 ×1.25 5 8.93~9.01 (100~85) 10 ×1.5 5 11.11~11.1
7 (100~90) 10 ×1.25 5 10.93~11.01 (100~85) 12 ×1.75 5 13.28~13.17 (100~90) 12 ×1.5 5 13.11~13.17 (100~90) 12 ×1.25 5 12.93~13.01 (100~85)
三、螺紋下孔徑表(護套螺紋用)
1、公制粗牙螺紋(單位：mm)
螺紋尺寸下孔徑鑽頭直徑
最小直徑最大直徑
M 2.5×0.45 2.60 2.65 2.6
2.6×0.45 2.70 2.75 2.7
3 ×0.5 3.12 3.20 3.1
4 ×0.7 4.17 4.30 4.2
5 ×0.8 5.1
6 5.33 5.2
6 ×1 6.25 6.42 6.3 8 ×1.25 8.31 8.52 8.4 10 ×1.5 10.3
7 10.62 10.5 12 ×1.75 12.43 12.73 12.5
14 ×2 14.49 14.83 14.5 16 ×2 16.49 16.83 16.5 18 ×2.5 18.58 19.04 19.0 20 ×2.5 20.58 21.04 21.0 22 ×2.5 22.58 23.04 23.0 24 ×2.5 24.70 25.25 25.0
2、公制細牙螺紋(單位：mm)
螺紋尺寸下孔徑鑽頭直徑
最小直徑最大直徑
M 10 ×1 10.25 10.42 10.3
10 ×1.25 10.31 10.52 10.4
12 ×1.25 12.31 12.52 12.5
12 ×1.5 12.37 12.62 12.5
14 ×1.5 14.37 14.62 14.5
16 ×1.5 16.37 16.62 16.5
18 ×1.5 18.37 18.62 18.5
20 ×1.5 20.37 20.62 20.5
20 ×2 20.47 20.83 20.5
22 ×1.5 22.37 22.62 22.5
24 ×1.5 24.37 24.62 24.5
24 ×2 24.47 24.83 24.5
30 ×1.5 30.37 30.62 30.5
3、美制粗牙螺紋(單位：mm)
螺紋尺寸下孔徑鑽頭直徑
最小直徑最大直徑
NO. 2 –56UNC 2.29 2.39 2.3
3 –48 2.6
4 2.74 2.7
4 –40 2.9
5 3.07 3.0
5 –40 3.25 3.38 3.3
6 –32 3.66 3.81 3.7
8 –32 4.32 4.47 4.4
10 –24 5.05 5.21 5.1
12 –24 5.61 5.77 5.7
1/4 –20 6.63 6.78 6.7
5/16 –8 8.33 8.48 8.4
3/8 –16 9.91 10.11 10.0
7/16–14 11.51 11.76 11.5
1/2 –13 13.08 13.34 13.1
9/16–12 14.68 14.94 14.7
4、美制細牙螺紋(單位：mm)
螺紋尺寸下孔徑鑽頭直徑
最小直徑最大直徑
NO. 4 –48UNF 2.97 3.05 3.0
6 –40 3.66 3.78 3.7
8 –36 4.32 4.44 4.4
10 –32 4.98 5.13 5.0
1/4 –28 6.53 6.71 6.6 5/16 –24 8.20 8.38 8.2
3/8 –24 9.78 9.96 9.8 7/16 –20 11.43 11.63 11.5
1/2 –20 13.03 13.26 13.1 9/16 –18 14.66 14.88 14.7
5/8 –18 16.26 16.48 16.3
3/4 –16 19.43 19.68 19.5
7/8 –14 22.61 22.86 22.7
1 –1
2 25.76 26.04 26.0
各種換算表
管用螺絲基準寸法(mm)
規格英制JIS(PT)美式ASA(NPT)
山數外徑有效徑山數外徑有效徑1/167.723277.777.142 1/8289.7289.1472710.1169.489 1/41913.15712.3011813.42712.487 3/81916.66215.8061816.86615.926 1/21420.95519.7931420.98019.772 3/41426.44125.2791426.32625.117 11133.24931.770111/233.93231.461 11/41141.91040.431111/241.68940.218 11/21147.80346.324111/247.68946.287 21159.61458.135111/259.79658.325 21/21175.18473.705872.27370.159 31187.88486.405888.18286.068 31/211100.33098.8518100.69198.776 411113.030111.5518113.548111.433 41/211125.730124.251
511138.430136.9518141.3138.412 51/211151.130149.651
611163.830162.3518168.3165.252 711189.230187.751
811214.630213.1518219.1215.901
美制螺絲外徑公厘(mm)換算表
規格吋mm
NO.00.0600 1.524
10.0730 1.854
20.0860 2.184
30.0990 2.515
40.1120 2.845
50.1250 3.175
60.1380 3.505
80.1640 4.166
100.1900 4.826
120.2160 5.486
山數節距換算表
山數(每25.4mm) 節距
mm
100 0.2540
80 0.3175
72 0.3528
64 0.3969 60 0.4233 56 0.4536 48 0.5292 44 0.5773 40 0.6350 36 0.7056 32 0.7938 28 0.9071 24 1.0583 20 1.2700 18 1.4111 16 1.5875 14 1.8143 13 1.9538 12 2.1167 11 2.3091 10 2.5400
9 2.8222
8 3.1750
7 3.6286
6 4.2333
5 5.0800 4 1/2 5.6444
4 6.3500 3 1/2 7.2571 3 1/4 7.8154
3 8.4667 2 7/8 8.8348 2 3/
4 9.2364 2 5/8 9.6762 2 1/2 10.1600
攻丝底孔对照表
M Metrisches ISO Regelgewinde / Metric ISO thread / Filetage métrique ISO standard / Filettatura metrica ISO / Rosca Métrica ISO Kurzzeichen Thread size Désignation Diametro del ?letto Dimensión rosca (DIN 13) Bohrer-; Nominal size diamètre du foret Diametro nominale ;-Taladro (mm) (acc. to DIN 336) Innengewindekern-; Minor diameter / Diamètre du noyau ?leté / Diametro del nocciolo ;-nucleo de rosca interior (mm) min 6H m a x M 10,750,7290,785* M 1,20,950,9290,985* M 1,41,11,0751,142* M 1,61,251,2211,321 M 1,71,351,3211,421 M 1,81,451,4211,521 M 21,61,5671,679 M 2,21,751,7131,838 M 2,31,851,8131,938 M 2,52,052,0132,138 M 2,62,152,1132,238 M 32,52,4592,599 M 3,52,92,8503,010 M 43,33,2423,422 M 4,53,73,6883,878 M 54,24,1344,334 M 654,9175,153 M 765,9176,153 M 86,86,6476,912 M 97,87,6477,912 M 108,58,3768,676 M 119,59,3769,676 M 1210,210,10610,441 M 141211,83512,210 M 161413,83514,210 M 1815,515,29415,744 M 2017,517,29417,744 M 2219,519,29419,744 M 242120,75221,252 M 272423,75224,252 M 3026,526,21126,771 M 3329,529,21129,771 M 363231,67032,270 M 393534,67035,270 M 4237,537,12937,799 M 4540,540,12940,799 M 484342,58743,297 M 524746,58747,297 M 5650,550,04650,796MF Metrisches ISO Feingewinde / Metric ISO Fine thread / Filetage métrique ?n ISO / Filettatura metrica ISO ?ne / Rosca Métrica ISO Fina Kurzzeichen Thread size Désignation Diametro del ?letto Dimensión rosca (DIN 13) Bohrer-; Nominal size diamètre du foret Diametro nominale ;-Taladro (mm) (acc. to DIN 336) Innengewindekern-; Minor diameter / Diamètre du noyau ?leté / Diametro del nocciolo ;-nucleo de rosca interior (mm) min 6H m a x M 2 x 0,251,751,7291,785 M 2,2 x 0,251,951,9291,985 M 2,3 x 0,252,052,0292,085 M 2,5 x 0,352,152,1212,221 M 3 x 0,252,752,7292,785 M 3 x 0,352,652,6212,721 M 3,5 x 0,353,153,1213,221 M 4 x 0,353,653,6213,721 M 4 x 0,53,53,4593,599 M 4,5 x 0,543,9594,099 M 5 x 0,354,654,6214,721 M 5 x 0,54,54,4594,599 M 5 x 0,754,24,1884,378 M 6 x 0,55,55,4595,599 M 6 x 0,755,255,1885,378 M 7 x 0,56,56,4596,599 M 7 x 0,756,256,1886,378 M 8 x 0,57,57,4597,599 M 8 x 0,757,257,1887,378 M 8 x 176,9177,153 M 9 x 0,758,258,1888,378 M 9 x 187,9178,153 M 10 x 0,59,59,4599,599 M 10 x 0,759,259,1889,378 M 10 x 198,9179,153 M 10 x 1,258,758,6478,912 M 11 x 1109,91710,153 M 12 x 0,511,511,45911,599 M 12 x 11110,91711,153 M 12 x 1,2510,7510,64710,912 M 12 x 1,510,510,37610,676 M 13 x 11211,91712,153 M 14 x 0,7513,213,18813,378 M 14 x 11312,91713,153 M 14 x 1,2512,7512,64712,912 M 14 x 1,512,512,37612,676 M 15 x 11413,91714,153 M 15 x 1,513,513,37613,676 M 16 x 0,7515,215,18815,378 M 16 x 11514,91715,153 M 16 x 1,2514,814,64714,912 M 16 x 1.514,514,37614,676 M 17 x 11615,91716,153 M 18 x 11716,91717,153 M 18 x 1.516,516,37616,676 M 18 x 21615,83516,210 M 20 x 11918,91719,153 M 20 x 1.518,518,37618,676 M 20 x 21817,83518,210 M 22 x 12120,91721,153 M 22 x 1,520,520,37620,676 * 5H max Gewindekernl?cher für Gewindebohrer Tapping drill sizes for taps / Avant-trous de taraudage Prefori per maschi / Dimensiones de la broca previa para machos MARYLAND METRICS Technical Data Chart: A collection of Tapping drill sizes for taps in a multilingual format https://www.wendangku.net/doc/f75906137.html,
攻牙下孔径对照表
建議下孔徑Recommended Tap Drill Sizes ◎公製牙
● ● 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
● 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，UNF
● 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─ BSW ● 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).
最全的螺纹孔径对照表
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
攻牙底孔的使用参数表
攻牙底孔的使用参数表 发布:admin | 发布时间: 2011年7月18日 攻牙底孔的使用参数表 一、螺紋下孔徑表 1、公制粗牙螺紋 JIS B 0209-1982(單位：mm) 螺纹尺寸钻头直径螺纹下孔徑內螺紋小徑 最小直径最大直径 M 1 × 0.25 0.75 0.78 (80%) 0.729 0.785 1.1 × 0.25 0.85 0.88 (80%) 0.829 0.885 1.2 × 0.25 0.95 0.98 (80%) 0.929 0.985 1.4 × 0.3 1.1 1.14 (80%) 1.075 1.142 1.6 × 0.35 1.25 1.32 (75%) 1.221 1.321 1.8 × 0.35 1.45 1.52 (75%) 1.421 1.521 2 × 0.4 1.6 1.65 (80%) 1.567 1.679 2.2 × 0.45 1.75 1.83 (75%) 1.713 1.838 2.5 × 0.45 2.1 2.13 (75%) 2.013 2.138 3 × 0.5 2.5 2.59 (75%) 2.459 2.599 3.5 × 0.6 2.9 3.01 (75%) 2.850 3.010 4 × 0.7 3.3 3.39 (80%) 3.242 3.422 4.5 × 0.75 3.8 3.85 (80%) 3.688 3.878 5 × 0.8 4.2 4.31 (80%) 4.134 4.334 6 × 1 5 5.13 (80%) 4.91 7 5.153 7 × 1 6 6.13 (80%) 5.917 6.153 8 × 1.25 6.8 6.85 (85%) 6.647 6.912 9 × 1.25 7.8 7.85 (85%) 7.647 7.912 10 × 1.5 8.5 8.62 (85%) 8.376 8.676 11 × 1.5 9.5 9.62 (85%) 9.376 9.676 12 × 1.75 10.3 10.40 (85%) 10.106 10.441 14 × 2 12 12.2 (85%) 11.835 12.210 16 × 2 14 14.2 (85%) 13.835 14.210 18 × 2.5 15.5 15.7 (85%) 15.294 15.744 20 × 2.5 17.5 17.7 (85%) 17.294 17.744 22 × 2.5 19.5 19.2 (85%) 19.294 19.744 24 × 3 21 21.2 (85%) 20.752 21.252 27 × 3 24 24.2 (85%) 23.752 24.252 30 × 3.5 26.5 26.6 (90%) 26.211 26.771 33 × 3.5 29.5 29.6 (90%) 29.211 29.771 36 × 4 32 32.1 (90%) 31.670 32.270 39 × 4 35 35.1 (90%) 34.670 35.270 42 × 4.5 37.5 37.6 (90%) 37.129 37.799 45 × 4.5 40.5 40.6 (90%) 40.129 40.799
螺纹底孔与攻牙后的孔径对照表
螺纹底孔与攻牙后的孔径对照表 以下是常用粗牙公制螺纹钻底孔尺寸对应表。一般情况等于外径-螺距 M1 Φ0.75 M2 Φ1.6 M3 Φ2.5 M4 Φ3.3 M5 Φ4.2 M6 Φ5 M8 Φ6.75 M10 Φ8.5 M12 Φ10.25 M14 Φ12 M16 Φ14 M18 Φ15.5 M20 Φ17.5 M22 Φ19.5 M24 Φ21 M27 Φ24 M30 Φ26.5 螺纹钻孔底径计算 一般按下列公式： 1.攻公制螺纹：螺距t<1毫米，dz=d-t t＞1毫米，dz=d-（1.04～1.06)t 式中t——螺距（毫米） dz——攻丝前钻孔直径（毫米） d——螺纹公称直径（毫米） 2.攻英制螺纹： 螺纹公称直径铸铁与青铜钢与黄铜 3/16"～5/8" dz＝25（d-1/n) dz＝25（d-1/n)+0.1 3/4"～11/2" dz＝25（d-1/n) dz＝25（d-1/n) +0.2 式中dz——攻丝前钻孔直径（毫米） d——螺纹公称直径（英寸） n——每英寸牙数 首先，要知道螺纹的外径D,螺距T,螺纹底孔直径d=D-T。 攻螺纹前钻底孔直径和深度的确定以及孔口的倒角 （1）底孔直径的确定丝锥在攻螺纹的过程中，切削刃主要是切削金属，但还有挤压金属的作用，因而造成金属凸起 并向牙尖流动的现象，所以攻螺纹前，钻削的孔径（即底孔）应大于螺纹内径。 底孔的直径可查手册或按下面的经验公式计算：
脆性材料（铸铁、青铜等）：钻孔直径d0=d(螺纹外径)-1.1p（螺距） 塑性材料（钢、紫铜等）：钻孔直径d0=d(螺纹外径)-p（螺距） （2）钻孔深度的确定攻盲孔（不通孔）的螺纹时，因丝锥不能攻到底，所以孔的深度要大于螺纹的长度， 盲孔的深度可按下面的公式计算： 孔的深度=所需螺纹的深度+0.7d 普通螺纹底孔直径简单计算可按下式 要攻丝的尺寸乘上0.85 如：M3--2.4mm M4--3.1mm M5--4.2m M6--5.1mm M8--6.8mm 公制螺纹的计算方法： 底径=大径-1.0825*螺距 英制螺纹的计算方法： 底径=大径-1.28*螺距 脆性材料钻孔直径D=d(螺纹外径)-1.1p（螺距） 塑性材料钻孔直径D=d(螺纹外径)-p（螺距） 除了以上的经验公司外,还要考虑螺纹的公差等级. 普通公制螺纹用外径-螺距。记这个最直观 螺纹外径计算方法(2009/09/06 19:48) 公制螺纹(MM牙) 牙深=0.6495*牙距P (牙角60度) 内牙孔径= 公称直径-1.0825*P M20x2.5-6H/7g (右手)-(单头螺纹)-(公制粗牙) (公称直径20mm) (牙距2.5mm) (内螺纹配合等级6H) (外螺纹配合等级7g) 左-双头-M20x1.5 (左手)-(双头螺纹)-(公制细牙) (公称直径20mm) (牙距1.5mm) 美制螺纹 (统一标准螺纹) 牙深= 0.6495*(25.4/每吋牙数) (牙角60度) 3/4-10UNC-2A (UNC粗牙)(UNF细牙) (1A 2A 3A 外牙公差配合等级) (1B 2B 3B 内牙公差配合等级)