螺纹底孔直径表

螺纹底孔直径表
螺纹底孔直径表
公制螺纹Metric screw threads JIS B 0209-1982 单位：mm
最小底孔径最大底孔径
螺纹尺寸推荐底孔径
各精度通用原JIS2级用4H用5H用8H用
M1×0.25 0.75 0.73 0.78 0.77 0.78 -
1×0.2 0.8 0.79 - 0.82 - -
1.1×0.25 0.85 0.83 0.88 0.87 0.88 -
1.1×0.2 0.9 0.89 - 0.92 - -
1.2×0.25 0.95 0.93 0.98 0.97 0.98 -
1.2×0.2 1 0.99 - 1.02 - -
1.4×0.3 1.1 1.08 1.14 1.12 1.14 1.16 1.4×0.2 1.2 1.19 - 1.22 - -
1.6×0.35 1.25 1.23 1.32 1.28 1.3 1.32 1.6×0.2 1.4 1.39 - 1.42 - -
1.7×0.3 1.4 - - - - -
1.7×0.25 1.45 - - - - -
1.7×0.2 1.5 - - - - -
1.8×0.35 1.45 1.43 1.52 1.48 1.5 1.52 1.8×0.2 1.6 1.59 - 1.77 - -
2×0.4 1.6 1.57 1.67 1.63 1.65 1.67 2×0.25 1.75 1.73 - 1.77 - -
2.2×0.45 1.75 1.72 1.83 1.79 1.81 1.83 2.2×0.25 1.95 1.93 -
1.97 - -
2.3×0.4 1.9 - - - - -
2.3×0.35 1.95 - - - - -
2.3×0.25 2.05 - - - - -
2.5×0.45 2.05 2.02 2.13 2.09 2.11 2.13 2.5×0.35 2.15 2.13 2.22 2.18 2.2 2.22 2.6×0.45 2.15 - - - - -
2.6×0.35 2.25 - - - - -
3×0.5 2.5 2.46 2.59 2.54 2.57 2.59 3×0.35 2.65 2.63 2.27 2.68
2.7 2.72
3.5×0.6 2.9 2.85 3.01 2.95 2.97 3.01 3.5×0.35 3.15 3.13
3.22 3.18 3.2 3.22
4×0.5 3.5 3.46 3.59 3.54 3.57 3.59 4.5×0.75 3.75 3.69 3.87 3.8 3.83 3.87 4.5×0.5 4 3.96 4.09 4.04 4.07 4.09 5×0.9 4.1 - - - - -
5×0.8 4.2 4.14 4.33 4.25 4.29 4.33 5×0.5 4.5 4.46 4.59 4.54
4.57 4.59
5.5×0.9 4.6 - - -
5.5×0.75 4.75 - - - - - 5.5×0.5 5 4.96 5.09 5.04 5.07 5.09
6×1 5 4.92 5.15 5.06 5.1 5.15 6×0.75 5.25 5.19 5.37 5.3 5.33
5.37 6×0.5 5.5 - - - - - 7×1 6 5.92
6.15 6.06 6.1 6.15 7×0.75 6.25
6.19 6.37 6.3 6.33 6.37 7×0.5 6.5 - - - - -
8×1.25 6.75 6.65 6.91 6.81 6.85 6.91 8×1 7 6.92 7.15 7.06 7.1 7.15 8×0.75 7.25 7.19 7.37 7.3 7.33 7.37 8×0.5 7.5 - - - - -
9×1.25 7.75 7.65 7.91 7.81 7.85 7.91 9×1 8 7.92 8.15 8.06 8.1 8.15 9×0.75 8.25 8.19 8.37 8.3 8.33 8.37 9×0.5 8.5 - - - - - 10×1.5 8.5 8.38 8.67 8.56 8.61 8.67 10×1.25 8.75 8.65 8.91 8.81 8.85 8.91 10×1 9 8.92 9.15 9.06 9.1 9.15 10×0.75 9.25 9.19 9.37 9.3 9.33
9.37 10×0.5 9.5 - - - - - 11×1.5 9.5 9.38 9.67 9.56 9.61 9.67 11×1
10 9.92 10.15 10.06 10.1 10.15 11×0.75 10.25 10.19 10.37 10.3 10.33 10.37 11×0.5 10.5 - - - - - 12×1.75 10.25 10.11 10.44 10.31 10.37 10.44 12×1.5 10.5 10.38 10.67 10.56 10.61 10.67 12×1.25
10.75 10.65 10.91 10.81 10.85 10.91 12×1 11 10.92 11.15 11.06
11.1 11.15
131.75 11.25 - - - - - 13×1.5 11.5 - - - - - 13×1.25 11.75 - - - - - 13×1 12 - - - - - 13×0.75 12.3 - - - - - 13×0.5 12.5 - - - - - 14×2 12 11.84 12.21 12 12.1 12.2 14×1.5 12.5 12.38 12.67 12.56 12.61 12.67 14×1 13 12.92 13.15 13.06 13.1 13.15 14×0.75 13.3 - - - - - 14×0.5 13.5 - - - - - 15×2 13 - - - - - 15×1.5 13.5 13.4 13.6 13.5 13.6 13.6 15×1.25 13.8 13.7 13.9 - - - 15×1 14 13.95 14.15 14.06
14.1 14.15 15×0.75 14.3 - - - - - 15×0.5 14.5 - - - - - 16×2 14 13.9 14.2 14 14.4 14.2 16×1.5 14.5 14.4 14.6 14.5 14.6 14.6 16×1 15
14.95 15.15 15.06 15.1 15.15 17×2 15 - - - - - 17×1.5 15.5 15.4
15.68 15.5 15.6 15.6 17×1.25 15.8 - - - - - 17×1 16 15.95 16.15
16.06 16.1 16.15 17×0.75 16.3 - - - - 17×0.5 16.5 - - - - - 18×2.5 15.5 15.3 15.7 15.5 15.6 15.7 18×2 16 15.9 16.2 16 16.1 16.2 18×1.5 16.5 16.4 16.6 16.5 16.6 16.5 18×1 17 16.95 17.15 17.06 17.1 17.15 19×2.5 16.5 - - - - - 19×2 17 - - - - - 19×1.5 17.5 - - - - - 19×1.25 17.8 - - - - - 19×1 18 - - - - -
20×2.5 17.5 17.3 17.7 17.5 17.6 17.7 20×2 18 17.9 18.2 18
18.1 18.2 20×1.5 18.5 18.4 18.6 18.5 18.6 18.6 20×1 19 18.95
19.15 19.06 19.1 19.15 21×2.5 18.5 - - - - - 21×1.5 19.5 - - - - - 21×1 20 - - - - - 22×2.5 19.5 19.3 19.7 19.5 19.6 19.7 22×2 20 19.9 20.2 20 20.1 20.2 22×1.5 20.5 20.4 20.6 20.5 20.6 20.6 22×1 21 20.95 21.15 21.06 21.1 21.15 23×2.5 20.5 - - - - - 23×2 21 - - - - - 23×1.5 21.5 - - - - - 23×1 22 - - - - - 24×3 21 20.8 21.2 21 21.1
21.2 24×2 22 21.9 22.2 22. 22.1 22.2 24×1.5 22.5 22.4 22.6 22.5
22.6 22.6 24×1 23 22.95 23.15 23.06 23.1 23.15 25×3 22 - - - - - 25×2 23 22.9 23.2 23 23.1 23.2 25×1.5 23.5 23.4 23.6 23.5 23.6
23.6 25×1 24 23.95 24.15 24.06 24.1 24.15 26×3 23 - - - - - 26×2
24 - - - - - 26×1.5 24.5 24.4 24.6 24.5 24.6 24.6 27×3 24 23.95
24.15 24.06 24.1 24.2 27×2.5 24.5 - - - - - 27×2 25 24.9 25.2 25
25.1 25.2 27×1.5 25.5 25.4 25.6 25.5 25.6 25.6 27×1 26 25.95
26.15 26.06 26.1 26.15
英制锥度管用螺纹
JIS B0203 JIS B0203 JIS B 2301 管用螺纹规格
锥度内螺纹Rc(PT) 平行管内螺纹Rp(PS) 锥度管内螺纹计算数值底孔直径计算数值底孔直径计算数值底孔直径1/16 ‐28 6.230 6.2 6.490 6.5 －－
1/8 ‐28 8.235 8.2 8.495 8.5 8.191 8.2
1/4 ‐19 10.941 10.9 11.341 11.4 10.945 10.9 3/8 ‐19 14.428 14.4 14.846 14.9 14.388 14.4 1/2 ‐14 17.950 18 18.489 18.5 17.943 18
3/4 ‐14 23.349 23 23.975 24 23.305 23
1 ‐11 19.423 29 30.111 30 29.353 29
1 1/4 ‐11 37.940 38 38.77
2 39 37.890 38
1 1/
2 ‐11 43.83
3 4
4 44.56
5 45 43.720 43
2 ‐11 55.412 55 56.476 56 55.406 55
2 1/2 ‐11 70.701 71 72.009 72 70.788 70
3 ‐11 83.201 83 84.709 85 83.36
4 83
3 1/2 ‐11 95.547 96 97.155 97 95.747 95
4 ‐11 107.834 108 109.85
5 110 108.322 108
5 ‐11 133.110 133 135.255 135 133.597 133
6 ‐11 158.510 159 160.655 161 158.810 158
英制平行管用螺纹（G、PF）
内螺纹最小径（参考）
管用螺纹规格底孔钻头直径最大尺寸最小尺寸
G 1/16 ‐28 6.7 6.843 6.561
G(PF) 1/8 ‐28 8.7 8.848 8.566
G(PF) 1/4 ‐19 11.7 11.890 11.445
G(PF) 3/8 ‐19 15.2 15.395 14.950
G(PF) 1/2 ‐14 19 19.172 18.631
G(PF) 5/8 ‐14 21 21.130 20.589
G(PF) 3/4 ‐14 24.5 24.658 24.117
G(PF) 7/8 ‐14 28.2 28.418 27.877
G(PF) 1 ‐11 30.6 30.931 30.291
G(PF) 1 1/8 ‐11 35.2 35.579 34.939
G(PF) 1 1/4 ‐11 39.2 39.592 38.952
G(PF) 1 1/2 ‐11 45 45.485 44.845
G(PF) 2 ‐11 57 57.296 56.656 G(PF) 2 1/4 ‐11 63 63.392 62.752 G(PF) 2 1/2 ‐11 72 72.866 72.226 G(PF) 2 3/4 ‐11 78.5 79.216 78.576 G(PF) 3 ‐11 85 85.566 84.926 G(PF) 3 1/2 ‐11 97 98.012 97.372 G(PF) 4 ‐11 ─110.712 110.072 G(PF) 4 1/2 ‐11 ─123.412 122.772 G(PF) 5 ‐11 ─136.112 135.472 G(PF) 5 1/2 ‐11 ─148.812 148.172 G(PF) 6 ‐11 ─161.512 160.872
美制标准管用螺纹（NPT、NPS）
锥度螺纹（NPT）
底孔钻头直径
使用铰刀不使用铰刀平行螺纹(NPS）
管用螺纹规格
mm inch mm inch mm inch 1/16 ‐27 5.94 0.234 6.15 0.246 6.35 0.250 1/8 ‐27 8.33 0.328 8.43 0.332 8.74 0.3441/4 ‐18 10.72 0.422 11.13 0.438 11.13 0.438 3/8 ‐18 14.27 0.562 14.27 0.562 14.68 0.578 1/2 ‐14 17.48 0.688 17.86 0.703 18.26 0.719 3/4 ‐14 22.63 0.891 23.01 0.906 23.42 0.922 1 ‐11 1/2 28.58 1.125 28.98 1.141 29.36 1.156 1 1/4 ‐11 1/2 37.31 1.469 37.69 1.484 38.10 1.500
1 1/
2 ‐11 1/2 43.26 1.70
3 43.66 1.719 44.45 1.750
2 ‐11 1/2 55.17 2.172 55.58 2.188 56.36 2.219 2 1/2 ‐8 65.48 2.578 66.27 2.609 67.46 2.656。