攻牙下孔径尺寸
螺丝,攻牙,孔径,对照表
0.783 0.883 0.983 1.183 1.383 1.460 1.583 1.729 1.929 2.001 2.121 2.186 2.621 3.121 3.459 3.959 4.459 4.959 5.188 5.400 6.188 6.400 6.917 7.188 7.400 7.917 8.188 8.647 8.917 9.188 9.400 8.917 10.188 10.376 10.647
1.182 1.474 1.756 2.025 2.271 2.551 2.820 3.404 3.963 4.496 5.360 6.782 8.382 9.729 11.329 12.751 14.351 17.323 20.270 23.114 26.289 29.464 32.639 35.814
0.821 0.921 1.021 1.221 1.421 1.500 1.621 1.785 1.985 2.610 2.221 2.246 2.721 3.221 3.599 4.099 4.599 5.099 5.378 5.550 6.378 6.550 7.153 7.378 7.520 8.153 8.378 8.912 9.153 9.378 9.520 10.153 10.378 10.676 10.912
1.25 1.55 1.85 2.10 2.40 2.70 2.90 3.50 4.10 4.60 5.50 6.90 8.50 9.90 11.50 12.90 14.50 17.50 20.50 23.20 26.50 29.50 32.80 36.00
1.305 1.612 1.912 2.197 2.458 2.740 3.022 3.606 4.165 4.724 5.588 7.035 8.636 10.033 11.607 13.081 14.681 17.678 20.575 23.571 26.746 29.921 33.096 36.271
螺纹攻牙底孔参数
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 6×15 5.13 (80%) 4.917 5.153 7×16 6.13 (80%) 5.917 6.153 8×1.25 6.86.85 (85%) 6.647 6.912 9×1.257.87.85 (85%) 7.647 7.912 10×1.58.5 8.62 (85%) 8.376 8.676 11×1.59.5 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 2.7213.5 ×0.35 3.2 3.22 (75%) 3.121 3.2214×0.5 3.5 3.59 (75%) 3.459 3.5994.5 ×0.5 4 4.09 (75%) 3.959 4.0995×0.5 4.5 4.59 (75%) 4.459 4.5995.5 ×0.5 5 5.09 (75%) 4.959 5.0996×0.75 5.3 5.35 (80%) 5.188 5.3787×0.75 6.3 6.35 (80%) 6.188 6.3788×1 7 7.13 (80%) 6.917 7.1538×0.75 7.3 7.35 (80%) 7.188 7.3789×1 8 8.13 (80%) 7.917 8.1539×0.75 8.3 8.35 (80%) 8.188 8.37810×1.25 8.8 8.85 (85%) 8.647 8.91210×1 9 9.13 (80%) 8.917 9.15310×0.75 9.3 9.35 (80%) 9.188 9.37811 ×1 10 10.13 (80%) 9.917 10.15311 ×0.75 10.3 10.35 (80%) 10.188 10.37812 ×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 11.15314 ×1.5 12.5 12.62 (85%) 12.376 12.67614 ×1 13 13.13 (80%) 12.917 13.15315 ×1.5 13.5 13.62 (85%) 13.376 13.67615 ×1 14 14.13 (80%) 13.917 14.15316 ×1.5 14.5 14.62 (85%) 14.376 14.67616 ×1 15 15.13 (80%) 14.917 15.15317 ×1.5 15.5 15.62 (85%) 15.376 15.676 17 ×1 16 16.13 (80%) 15.917 16.15318 ×2 16 16.2 (85%) 15.835 16.21018 ×1.5 16.5 16.62 (85%) 16.376 16.67618 ×1 17 17.13 (80%) 16.917 17.15320 ×2 18 18.2 (85%) 17.835 18.21020 ×1.5 18.5 18.62 (85%) 18.376 18.67620 ×1 19 19.13 (80%) 18.917 19.15322 ×2 20 20.2 (85%) 19.835 20.21022 ×1.5 20.5 20.62 (85%) 20.376 20.67622 ×1 21 21.13 (80%) 20.917 21.15324 ×2 22 22.2 (85%) 21.835 22.21024 ×1.5 22.5 22.62 (85%) 22.376 22.67624 ×1 23 23.13 (80%) 22.917 23.15325 ×2 23 23.2 (85%) 22.835 23.21025 ×1.5 23.5 23.62 (85%) 23.376 23.67625 ×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 25.67627 ×1 26 26.13 (80%) 25.917 26.15328 ×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 ×1.528.5 28.62 (85%) 28.376 28.676 30 ×1 29 29.13 (80%) 28.91729.153 32 ×2 30 30.2 (85%) 29.835 30.21032 ×1.5 30.5 30.62 (85%) 30.376 30.67633 ×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 31.67635 ×1.5 33.5 33.62 (85%) 33.376 33.67636 ×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 34.67638 ×1.5 36.5 36.62 (85%) 36.376 36.67639 ×3 36 36.2 (85%) 35.752 36.252 39 ×2 37 37.2 (85%) 36.835 37.21039 ×1.5 37.5 37.62 (85%) 37.376 37.67640 ×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 3838.1 (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%) 40.37640.676 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 46.21048 ×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 1.5822 -56 1.8 1.86 (65%) 1.695 1.8713 -48 2.1 2.14 (65%) 1.941 2.1464 -40 2.3 2.36 (70%) 2.157 2.3855 -40 2.6 2.69 (70%) 2.487 2.6976 -32 2.8 2.86 (75%) 2.642 2.89510 -24 3.9 3.91 (80%) 3.683 3.96212 -24 4.5 4.57 (80%) 4.344 4.5971/4 -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%) 13.38613.868 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 22.60611/8 -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 39.8272 - 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 1.3051 -72 1.55 1.61 (65%) 1.474 1.6122 -64 1.85 1.90 (65%) 1.756 1.9123 -56 2.1 2.17 (70%) 2.025 2.1974 -48 2.4 2.44 (70%) 2.271 2.4585 -44 2.7 2.74 (70%) 2.551 2.7406 -40 2.9 3.02 (70%) 2.820 3.0228 -36 3.5 3.59 (75%) 3.404 3.60610 -32 4.1 4.14 (80%) 3.963 4.16512 -28 4.6 4.70 (80%) 4.496 4.7241/4 -28 5.5 5.56 (80%) 5.360 5.5885/16-24 6.9 7.02 (80%) 6.782 7.0357/16-20 9.9 10.01 (80%) 9.729 10.0331/2 -20 11.5 11.60 (80%) 11.329 11.6079/16 -18 12.9 13.07 (80%) 12.751 13.0815/8 -18 14.5 14.65 (80%) 14.351 14.6813/4 -16 17.5 17.59 (85%) 17.323 17.6787/8 -14 20.5 20.6(85%) 20.270 20.6751-12 23.2 23.5(85%) 23.114 23.5711 1/8 -12 26.5 26.7(80%) 26.289 26.7461 1/4 -12 29.5 29.9(80%) 29.464 29.9211 3/8 -12 32.8 33.0(85%) 32.639 33.0961 1/2 -12 36 36.2(85%) 35.814 36.2715、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 78.469.6 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 88.31 7/8 41.8 41.5 80.6 84.7 74.7 88.42 45.0 44.7 80.2 84.4 74.7 88.46、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 37.890 381 1/2 43.833 44 44.565 45 43.720 432 55.412 55 56.476 56 55.406 552 1/2 70.701 71 72.009 72 70.788 703 83.201 83 84.709 85 83.364 833 1/2 95.547 96 97.155 97 95.747 954 107.834 108 109.855 110 108.322 1085 133.110 133 135.255 135 133.597 1336 158.510 159 160.655 161 158.810 1587 183.360 183 185.954 1868 208.560 209 211.354 2129 233.960 234 236.754 23710 259.166 259 262.154 26212 309.747 310 312.875 3137、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) 15/321.156 (29.36) 1 5/32 1.156 (29.36)1 1/4 1 15/32 1.469 (37.31) 11/21.500 (38.10) －－1 1/2 1 45/64 1.703 (43.26) 147/641.734 (44.04) －－2 2 3/16 2.188 (55.58) 27/322.219 (56.36) －－2 1/2 2 19/32 2.594 (65.89) 241/642.641 (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) 1.2×0.252 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 ~ 2.33 (100~75)2.6×0.45 2 2.35 ~ 2.39(100~80) 4 2.38 ~ 2.43 (100~75)3 ×0.5 3 2.74 ~ 2.78(100~80)5 2.76 ~ 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 3.65 ~ 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 5.48 ~ 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 - 12 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) 1.6×0.35 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 52.72 ~2.77 (100~80) 6 2.72 ~2.78 (100~75)3 ×0.35 3 2.80 ~2.84 (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 ×0.75 3 3.57 ~3.64 (100~85)6 3.57 ~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 34.55 ~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 5.61~5.66 (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 11.11~11.17 (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 ×1.255 12.93~13.01 (100~85)三、螺紋下孔徑表(護套螺紋用)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 2.62.6×0.45 2.70 2.75 2.73 ×0.5 3.12 3.20 3.14 ×0.7 4.17 4.30 4.25 ×0.8 5.16 5.33 5.26 ×1 6.25 6.42 6.3 8 ×1.25 8.31 8.52 8.4 10 ×1.5 10.37 10.62 10.5 12 ×1.75 12.43 12.73 12.514 ×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 25.02、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 10.310 ×1.25 10.31 10.52 10.412 ×1.25 12.31 12.52 12.512 ×1.5 12.37 12.62 12.514 ×1.5 14.37 14.62 14.516 ×1.5 16.37 16.62 16.518 ×1.5 18.37 18.62 18.520 ×1.5 20.37 20.62 20.520 ×2 20.47 20.83 20.522 ×1.5 22.37 22.62 22.524 ×1.5 24.37 24.62 24.524 ×2 24.47 24.83 24.530 ×1.5 30.37 30.62 30.5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 2.33 –48 2.64 2.74 2.74 –40 2.95 3.07 3.05 –40 3.25 3.38 3.36 –32 3.66 3.81 3.78 –32 4.32 4.47 4.410 –24 5.05 5.21 5.112 –24 5.61 5.77 5.71/4 –20 6.63 6.78 6.75/16 –8 8.33 8.48 8.43/8 –16 9.91 10.11 10.07/16–14 11.51 11.76 11.51/2 –13 13.08 13.34 13.19/16–12 14.68 14.94 14.74、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 3.06 –40 3.66 3.78 3.78 –36 4.32 4.44 4.410 –32 4.98 5.13 5.01/4 –28 6.53 6.71 6.6 5/16 –24 8.20 8.38 8.23/8 –24 9.78 9.96 9.8 7/16 –20 11.43 11.63 11.51/2 –20 13.03 13.26 13.1 9/16 –18 14.66 14.88 14.7 5/8 –18 16.26 16.48 16.33/4 –16 19.43 19.68 19.57/8 –14 22.61 22.86 22.71 –12 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 1/8289.7289.1472710.1169.4891/41913.15712.3011813.42712.4873/81916.66215.8061816.86615.9261/21420.95519.7931420.98019.7723/41426.44125.2791426.32625.11711133.24931.770111/233.93231.46111/41141.91040.431111/241.68940.21811/21147.80346.324111/247.68946.28721159.61458.135111/259.79658.32521/21175.18473.705872.27370.15931187.88486.405888.18286.06831/211100.33098.8518100.69198.776411113.030111.5518113.548111.433 41/211125.730124.251 511138.430136.9518141.3138.412 51/211151.130149.651611163.830162.3518168.3165.252 711189.230187.751811214.630213.1518219.1215.901美制螺絲外徑公厘(mm)換算表規格吋mmNO.00.0600 1.52410.0730 1.85420.0860 2.18430.0990 2.51540.1120 2.84550.1250 3.17560.1380 3.50580.1640 4.166100.1900 4.826120.2160 5.486山數節距換算表山數(每25.4mm) 節距mm100 0.254080 0.317572 0.352864 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 2.54009 2.82228 3.17507 3.62866 4.23335 5.0800 4 1/2 5.64444 6.3500 3 1/2 7.2571 3 1/4 7.81543 8.4667 2 7/8 8.8348 2 3/4 9.2364 2 5/8 9.6762 2 1/2 10.1600。
超全螺纹攻牙钻孔直径和滚造直径对照表
M27×3.0
24.00
24.252
23.752
M30×3.5
26.50
26.771
26.211
公 制 细 螺 纹
规格
标准径
2级牙钻孔径
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
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
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
NO.0-80(1.524)
螺纹底孔与攻牙后的孔径对照表
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=
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
(牙角55度)
PT 3/4-14 (锥度管螺纹)锥度管螺纹,锥度比1/16
3/4英吋管用,每英吋14牙
管螺纹
(PS直螺纹)(PF细牙)
牙深=
0.6403*(25.4/每吋牙数)
(牙角55度)
PS 3/4-14 (直形管螺纹)
PF1 1/8-16 (直形管螺纹)
(细牙)
直形管螺纹
3/4英吋管用,每英吋14牙
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。
螺丝攻牙孔径对照表
M12*1.0 M12*0.5 M14*1.5 M14*1.0 M15*1.5 M15*1.0 M16.1.5 M16*1.0 M17*1.5 M17*1.0 M18*2.0 M18*1.5 M18*1.0 M20*2.0 M20*1.5 M20*1.0 M22*2.0 M22*1.5 M22*1.0 M24*2.0 M24*1.5 M24*1.0 M25*2.0 M25*1.5 M25*1.0 M26*1.5 M27*2.0 M27*1.5 M27*1.0 M28*2.0 M28*1.5 M28*1.0 M30*3.0 M30*2.0 M30*1.5 M30*1.0 M32*2.0 M32*1.5 M33*1.0 M33*2.0 M33*1.5 M35*1.5 M36*3.0 M36*2.0 M36*1.5
10.917 11.400 12.376 12.917 13.376 13.917 14.376 14.917 15.376 15.917 15.835 16.976 16.917 17.835 18.376 18.917 19.835 20.376 20.917 21.835 22.376 22.917 22.835 23.376 23.917 24.376 24.835 25.376 25.917 25.835 26.376 26.917 26.752 27.835 28.376 28.917 29.835 30.376 29.752 30.835 31.376 33.376 32.752 33.835 34.376
1.25 1.55 1.85 2.10 2.40 2.70 2.90 3.50 4.10 4.60 5.50 6.90 8.50 9.90 11.50 12.90 14.50 17.50 20.50 23.20 26.50 29.50 32.80 36.00
标准螺丝攻牙钻孔径对照表【大全】
标准公制螺母攻牙要钻个小于螺纹大径的孔来攻牙。
这个孔的大小就是螺纹小径到螺纹中径。
如何确认孔径大小就要参照对照表啦,一起来看看吧！螺丝攻牙钻孔径对照表- 14 (3.175) 1- 11 30.20 30.472 30.111NO.6 - 32(3.505)2.80 2.895 2.6421-1/4 -11 38.80 39.133 38.771NO.8 - 32(4.166)3.40 3.530 3.3021-1/2 -11 44.70 45.026 44.664NO.10 -24(4.826)3.90 3.962 3.6832- 11 56.50 56.837 56.475NO.12 -24(5.486)4.50 4.597 4.3441/4 - 20 5.10 5.257 4.979英制管螺纹5/16 - 18 6.60 6.731 6.401 PF规格(新规格G) 标准径最大最小3/8 - 16 8.00 8.153 7.7987/16 - 14 9.40 9.550 9.1441/16 -286.70 6.843 6.561 1/2 - 13 10.90 11.023 10.592 1/8- 288.70 8.848 8.566 9/16 - 12 12.20 12.446 11.989 1/4- 1911.70 11.89 11.445 5/8 - 11 13.60 13.868 13.386 3/8- 1915.20 15.395 14.950 3/4 - 10 16.60 16.840 16.3071/2 - 14 19.00 19.172 18.6317/8- 919.60 19.761 19.177中之毋螺牙径1/16 -6.10 6.20 6.244 6.384281/8 -8.10 8.20 8.249 8.388281/4 -10.70 11.00 10.962 11.174193/8 -14.20 14.50 14.448 14.658191/2 -17.60 18.00 17.979 18.263143/4 -23.00 23.50 23.378 23.66314129.00 29.50 29.459 29.822- 111-1/4 -37.50 38.00 37.976 38.339111-1/2 -43.40 44.00 43.869 44.23211254.90 55.50 55.412 55.844- 11美制管螺纹针车用螺纹规格钻孔径规格标准径最大最小N P TN P SSM1/16 - 80 1.25 1.281 1.211使用绞刀时不用绞刀时SM5/64 - 64 1.55 1.593 1.5131/16 -275.946.15 6.35 SM3/32 - 56 1.90 1.936 1.841 1/8- 278.33 8.43 8.74 SM3/32 -100 2.10 2.156 2.081 1/4- 1810.72 11.13 11.13 SM1/8 - 32 2.30 2.393 2.233 3/8- 1814.27 14.27 14.68 SM1/8 - 40 2.50 2.551 2.421 1/2- 1417.48 17.86 18.26 SM1/8 - 44 2.50 2.605 2.485 3/4-1422.63 23.01 23.42 SM1/8 - 48 2.60 2.657 2.5471-11-1/228.58 28.98 29.36 SM9/64 - 32 2.70 2.79 2.6301-1/4 -11-1/237.31 37.69 38.10 SM9/64 - 40 2.90 2.948 2.8181-1/2-11-1/2 43.26 43.66 44.45SM11/64-323.50 3.584 3.4242-11-1/2 55.17 55.58 56.36SM11/64-403.70 3.742 3.612SM3/16 - 24 3.60 3.658 3.498英制螺纹SM3/16 - 28 3.80 3.844 3.684 规格钻孔径SM3/16 - 32 3.90 3.98 3.820 硬材软材SM3/16 - 40 4.05 4.138 4.008 W 1/8- 402.65 2.60 SM7/32 - 32 4.70 4.774 4.614 W 5/32- 323.25 3.20 SM15/64 -28 5.00 5.0554.875 W 3/16- 243.75 3.70 SM1/4 - 24 5.20 5.266 5.086 W 1/4- 205.10 5.00 SM1/4 - 28 5.40 5.452 5.272 W 5/16- 186.60 6.50 SM1/4 - 40 5.60 5.726 5.596 W 3/8- 168.00 7.90 SM9/32 - 20 5.70 5.824 5.634 W 7/16- 149.40 9.30 SM9/32 - 28 6.20 6.256 6.066 W 1/2- 1210.70 10.50 SM5/16 - 18 6.30 6.444 6.254 W 9/16- 1212.30 12.00 SM5/16 - 24 6.80 6.864 6.674W 5/813.70 13.50 SM5/16 - 28 6.90 7.05 6.860 - 11W 3/416.70 16.50 SM11/32 -28 7.70 7.843 7.653 - 10W 7/819.50 19.30 SM3/8 - 18 7.90 8.053 7.843 - 9W 122.40 22.00 SM3/8 - 28 8.50 8.637 8.447 - 825.00 24.00 SM7/16 - 16 9.30 9.44 9.220 W1-1/8- 728.30 28.00 SM7/16 - 28 10.10 10.224 10.034 W1-1/4- 7W 5/166.60 6.50 SM1/2 - 12 10.30 10.42 10.180 - 18W 3/88.00 7.90 SM1/2 - 20 11.30 11.41 11.190 - 16W 7/169.40 9.30 SM1/2 - 28 11.70 11.812 11.622 - 14W 1/210.70 10.50 SM9/16 - 20 12.90 13.018 12.778 - 12W 9/16 12.30 12.00- 12W 5/8- 1113.70 13.50W 3/4- 1016.70 16.50W 7/8- 919.50 19.30W 1- 822.40 22.00W1-1/8- 725.00 24.00W1-1/4- 728.30 28.00公制迫牙丝攻钻孔径美制迫牙丝攻钻孔径规格精度最大最小规格精度最大最小M1.0×0.25 G4 0.92 0.891-64UNCG5 1.76 1.68M1.2×0.25 G4 1.12 1.092-56G4 2.04 1.96M1.4×0.30 G4 1.3 1.263-48G4 2.35 2.250.80 -80UNC M6.0×1.0 G7 5.59 5.491-72G5 1.77 11.7M7.0×1.0 G7 6.59 6.492-64G4 2.06 1.98M8.0×1.25 G7 7.49 7.363-56G4 2.37 2.29M10×1.50 G7 9.34 9.224-48G5 2.68 2.59M10×1.25 G7 9.49 9.355-44G5 2.99 2.9M12×1.75 G8 11.23 11.096-40G5 3.29 3.19M12×1.25 G9 11.5 11.368-36G5 3.91 3.8110 -32 G6 4.53 4.44英制电器螺纹12 -28 G6 5.13 5.03 规格钻孔径1/4" -28 G7 6 5.91 2BA 4.0-4.2 5/16" -24 G7 7.53 7.42 3BA 3.4-3.6 3/8" -24 G7 9.1 8.99 4BA 3.0-3.2 7/16" -20 G8 10.62 10.48 5BA 2.7-2.8 1/2" -20 G8 12.2 12.06 6BA 2.4-2.5扩展资料：攻丝方法：攻丝是用一定的扭矩将丝锥旋入要钻的底孔中加工出内螺纹。
超全螺纹攻牙钻孔直径和滚造直径对照表,值得收藏!
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
39.50
39.827
38.964
2 -4-1/2
45.20
45.593
44.679
英制螺纹
规格
钻孔径
硬材
软材
W1/8 - 40
2.65
2.60
W5/32 - 32
3.25
3.20
W3/16 - 24
3.75
3.70
W1/4 - 20
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
美 制 粗 螺 纹
规格(UNC)
标准径
1.40
1.421
1.383
M1.7×0.2
1.45
1.500
1.460
M1.8×0.2
1.60
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M 1 ×0.25 0.75 0.78 (80%) 0.729 0.7851.1 ×0.25 0.85 0.88 (80%) 0.829 0.8851.2 ×0.25 0.95 0.98 (80%) 0.929 0.9851.4 ×0.3 1.1 1.14 (80%) 1.075 1.1421.6 ×0.35 1.25 1.32 (75%) 1.221 1.3211.8 ×0.35 1.45 1.52 (75%) 1.421 1.5212 ×0.4 1.6 1.65 (80%) 1.567 1.6792.2 ×0.45 1.75 1.83 (75%) 1.713 1.8382.5 ×0.45 2.1 2.13 (75%) 2.013 2.1383 ×0.5 2.5 2.59 (75%) 2.459 2.5993.5 ×0.6 2.9 3.01 (75%) 2.850 3.0104 ×0.7 3.3 3.39 (80%) 3.242 3.4224.5 ×0.75 3.8 3.85 (80%) 3.688 3.8785 ×0.8 4.2 4.31 (80%) 4.134 4.3346 × 1 5 5.13 (80%) 4.917 5.1537 × 1 6 6.13 (80%) 5.917 6.1538 × 1.25 6.8 6.85 (85%) 6.647 6.9129 × 1.25 7.8 7.85 (85%) 7.647 7.91210 × 1.5 8.5 8.62 (85%) 8.376 8.67611 × 1.5 9.5 9.62 (85%) 9.376 9.67612 × 1.75 10.3 10.40 (85%) 10.106 10.44114 × 2 12 12.2 (85%) 11.835 12.21016 × 2 14 14.2 (85%) 13.835 14.21018 × 2.5 15.5 15.7 (85%) 15.294 15.74420 × 2.5 17.5 17.7 (85%) 17.294 17.74422 × 2.5 19.5 19.2 (85%) 19.294 19.74424 × 3 21 21.2 (85%) 20.752 21.25227 × 3 24 24.2 (85%) 23.752 24.25230 × 3.5 26.5 26.6 (90%) 26.211 26.77133 × 3.5 29.5 29.6 (90%) 29.211 29.77136 × 4 32 32.1 (90%) 31.670 32.27039 × 4 35 35.1 (90%) 34.670 35.27042 × 4.5 37.5 37.6 (90%) 37.129 37.79945 × 4.5 40.5 40.6 (90%) 40.129 40.79948 × 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-01 JIS 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M 2.5 ×0.35 2.2 2.22 (75%) 2.121 2.2213 ×0.35 2.7 2.72 (75%) 2.621 2.7213.5 ×0.35 3.2 3.22 (75%) 3.121 3.2214 ×0.5 3.5 3.59 (75%) 3.459 3.5994.5 ×0.5 4 4.09 (75%) 3.959 4.0995 ×0.5 4.5 4.59 (75%) 4.459 4.5995.5 ×0.5 5 5.09 (75%) 4.959 5.0996 ×0.75 5.3 5.35 (80%) 5.188 5.3787 ×0.75 6.3 6.35 (80%) 6.188 6.3788 × 1 7 7.13 (80%) 6.917 7.1538 ×0.75 7.3 7.35 (80%) 7.188 7.3789 × 1 8 8.13 (80%) 7.917 8.1539 ×0.75 8.3 8.35 (80%) 8.188 8.37810 × 1.25 8.8 8.85 (85%) 8.647 8.91210 × 1 9 9.13 (80%) 8.917 9.15310 ×0.75 9.3 9.35 (80%) 9.188 9.37811 × 1 10 10.13 (80%) 9.917 10.15311 ×0.75 10.3 10.35 (80%) 10.188 10.37812 × 1.5 10.5 10.62 (85%) 10.376 10.67612 × 1.25 10.8 10.85 (85%) 10.647 10.91212 × 1 11 11.13 (80%) 10.917 11.15314 × 1.5 12.5 12.62 (85%) 12.376 12.67614 × 1 13 13.13 (80%) 12.917 13.15315 × 1.5 13.5 13.62 (85%) 13.376 13.67615 × 1 14 14.13 (80%) 13.917 14.15316 × 1.5 14.5 14.62 (85%) 14.376 14.67616 × 1 15 15.13 (80%) 14.917 15.15317 × 1.5 15.5 15.62 (85%) 15.376 15.67617 × 1 16 16.13 (80%) 15.917 16.15318 × 2 16 16.2 (85%) 15.835 16.21018 × 1.5 16.5 16.62 (85%) 16.376 16.67618 × 1 17 17.13 (80%) 16.917 17.15320 × 2 18 18.2 (85%) 17.835 18.21020 × 1.5 18.5 18.62 (85%) 18.376 18.67620 × 1 19 19.13 (80%) 18.917 19.15322 × 2 20 20.2 (85%) 19.835 20.21022 × 1.5 20.5 20.62 (85%) 20.376 20.67622 × 1 21 21.13 (80%) 20.917 21.15324 × 2 22 22.2 (85%) 21.835 22.21024 × 1.5 22.5 22.62 (85%) 22.376 22.67624 × 1 23 23.13 (80%) 22.917 23.15325 × 2 23 23.2 (85%) 22.835 23.21025 × 1.5 23.5 23.62 (85%) 23.376 23.67625 × 1 24 24.13 (80%) 23.917 24.153公制細牙螺紋-02 JIS 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M 26 × 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 25.67627 × 1 26 26.13 (80%) 25.917 26.15328 × 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 27.15330 × 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 30.21032 × 1.5 30.5 30.62 (85%) 30.376 30.67633 × 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 31.67635 × 1.5 33.5 33.62 (85%) 33.376 33.67636 × 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 34.67638 × 1.5 36.5 36.62 (85%) 36.376 36.67639 × 3 36 36.2 (85%) 35.752 36.252 39 × 2 37 37.2 (85%) 36.835 37.21039 × 1.5 37.5 37.62 (85%) 37.376 37.67640 × 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 46.21048 × 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 1.5822 -56 1.8 1.86 (65%) 1.695 1.8713 -48 2.1 2.14 (65%) 1.941 2.1464 -40 2.3 2.36 (70%) 2.157 2.3855 -40 2.6 2.69 (70%) 2.487 2.6976 -32 2.8 2.86 (75%) 2.642 2.8958 -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 4.5971/4 -20 5.1 5.25 (80%) 4.979 5.2575/16 -18 6.6 6.72 (80%) 6.401 6.7313/8 -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 22.6061 1/8 - 7 25 25.2 (85%) 24.638 25.3491 1/4 - 7 28.2 28.4 (85%) 27.813 28.5241 3/8 - 6 30.8 31.0 (85%) 30.353 31.1151 1/2 - 6 34 34.2 (85%) 33.528 34.2901 3/4 - 5 39.5 39.8 (85%) 38.964 39.8272 - 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 1.3051 -72 1.55 1.61 (65%) 1.474 1.6122 -64 1.85 1.90 (65%) 1.756 1.9123 -56 2.1 2.17 (70%) 2.025 2.1974 -48 2.4 2.44 (70%) 2.271 2.4585 -44 2.7 2.74 (70%) 2.551 2.7406 -40 2.9 3.02 (70%) 2.820 3.0228 -36 3.5 3.59 (75%) 3.404 3.60610 -32 4.1 4.14 (80%) 3.963 4.16512 -28 4.6 4.70 (80%) 4.496 4.7241/4 -28 5.5 5.56 (80%) 5.360 5.5885/16 -24 6.9 7.02 (80%) 6.782 7.0353/8 -24 8.5 8.61 (80%) 8.382 8.6367/16 -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 -12 26.5 26.7 (80%) 26.289 26.746 1 1/4 -12 29.5 29.9 (80%) 29.464 29.921 1 3/8 -12 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 88.31 7/8 41.8 41.5 80.6 84.7 74.7 88.42 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 0203 JIS 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 37.890 381 1/2 43.833 44 44.565 45 43.720 432 55.412 55 56.476 56 55.406 552 1/2 70.701 71 72.009 72 70.788 703 83.201 83 84.709 85 83.364 833 1/2 95.547 96 97.155 97 95.747 954 107.834 108 109.855 110 108.322 1085 133.110 133 135.255 135 133.597 1336 158.510 159 160.655 161 158.810 1587 183.360 183 185.954 1868 208.560 209 211.354 2129 233.960 234 236.754 23710 259.166 259 262.154 26212 309.747 310 312.875 3137、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 15/32 1.469 (37.31) 11/21.500 (38.10) －－1 1/2 1 45/64 1.703 (43.26) 147/641.734 (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) 241/642.641 (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 ~ 2.33 (100~75)2.6×0.45 2 2.35 ~ 2.39 (100~80) 4 2.38 ~ 2.43 (100~75)3 ×0.5 3 2.74 ~ 2.78 (100~80)5 2.76 ~ 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 3.65 ~ 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 5.48 ~ 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 最小～最大RH 最小～最大精度(嵌合率％) 精度(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 - 12 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) 1.6×0.35 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 ~2.84 (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 ×0.75 3 3.57 ~3.64 (100~85)6 3.57 ~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 5.61~5.66 (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 11.11~11.17 (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 2.62.6 ×0.45 2.70 2.75 2.73 ×0.5 3.12 3.20 3.14 ×0.7 4.17 4.30 4.25 ×0.8 5.16 5.33 5.26 × 1 6.25 6.42 6.38 × 1.25 8.31 8.52 8.414 × 2 14.49 14.83 14.516 × 2 16.49 16.83 16.518 × 2.5 18.58 19.04 19.020 × 2.5 20.58 21.04 21.022 × 2.5 22.58 23.04 23.024 × 2.5 24.70 25.25 25.02、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 10.310 × 1.25 10.31 10.52 10.412 × 1.25 12.31 12.52 12.512 × 1.5 12.37 12.62 12.514 × 1.5 14.37 14.62 14.516 × 1.5 16.37 16.62 16.518 × 1.5 18.37 18.62 18.520 × 1.5 20.37 20.62 20.520 × 2 20.47 20.83 20.522 × 1.5 22.37 22.62 22.524 × 1.5 24.37 24.62 24.524 × 2 24.47 24.83 24.530 × 1.5 30.37 30.62 30.53、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 2.33 –48 2.64 2.74 2.74 –40 2.95 3.07 3.05 –40 3.25 3.38 3.36 –32 3.66 3.81 3.78 –32 4.32 4.47 4.410 –24 5.05 5.21 5.112 –24 5.61 5.77 5.71/4 –20 6.63 6.78 6.75/16 –8 8.33 8.48 8.43/8 –16 9.91 10.11 10.07/16 –14 11.51 11.76 11.51/2 –13 13.08 13.34 13.19/16 –12 14.68 14.94 14.74、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 3.010 –32 4.98 5.13 5.01/4 –28 6.53 6.71 6.65/16 –24 8.20 8.38 8.23/8 –24 9.78 9.96 9.87/16 –20 11.43 11.63 11.51/2 –20 13.03 13.26 13.19/16 –18 14.66 14.88 14.75/8 –18 16.26 16.48 16.33/4 –16 19.43 19.68 19.57/8 –14 22.61 22.86 22.71 –12 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1/16 7.723 27 7.77 7.142 1/8 28 9.728 9.147 27 10.116 9.489 1/4 19 13.157 12.301 18 13.427 12.487 3/8 19 16.662 15.806 18 16.866 15.926 1/2 14 20.955 19.793 14 20.980 19.772 3/4 14 26.441 25.279 14 26.326 25.1171 11 33.249 31.770 111/2 33.932 31.46111/4 11 41.910 40.431 111/2 41.689 40.218 11/2 11 47.803 46.324 111/2 47.689 46.2872 11 59.614 58.135 111/2 59.796 58.32521/2 11 75.184 73.705 8 72.273 70.1593 11 87.884 86.405 8 88.182 86.06831/2 11 100.330 98.851 8 100.691 98.7764 11 113.030 111.551 8 113.548 111.43341/2 11 125.730 124.2515 11 138.430 136.951 8 141.3 138.41251/2 11 151.130 149.6516 11 163.830 162.351 8 168.3 165.2527 11 189.230 187.7518 11 214.630 213.151 8 219.1 215.901美制螺絲外徑公厘(mm)換算表規格吋mmNO. 0 0.0600 1.5241 0.0730 1.8542 0.0860 2.1843 0.0990 2.5154 0.1120 2.8455 0.1250 3.1756 0.1380 3.5058 0.1640 4.16610 0.1900 4.82612 0.2160 5.486山數節距換算表山數(每25.4mm) 節距mm 100 0.254080 0.317572 0.352864 0.396960 0.423356 0.453648 0.529244 0.577340 0.635036 0.705632 0.793828 0.907124 1.058320 1.270018 1.411116 1.587514 1.814313 1.953812 2.116711 2.309110 2.54009 2.82228 3.17507 3.62866 4.23335 5.08004 1/2 5.64444 6.35003 1/2 7.25713 1/4 7.81543 8.46672 7/8 8.83482 3/4 9.23642 5/8 9.67622 1/2 10.1600。
攻牙底孔径对照表
切削丝攻（公制粗牙）
切削丝攻（美制粗牙 UNC）
挤压丝攻（公制螺纹）
螺丝规格 钻头径
2级螺纹底孔径
最小尺寸 最大尺寸
M 1.0×0.25
1.1×0.25 1.2×0.25 1.4×0.3 1.6×0.35 1.7×0.35 1.8×0.35 2.0×0.4 2.2×0.45 2.3×0.4 2.5×0.45 2.6×0.45 3.0×0.6 3.0×0.5 3.5×0.6 4.0×0.75 4.0×0.7 4.5×0.75 5.0×0.9 5.0×0.8 5.5×0.9 6.0×1.0 7.0×1.0 8.0×1.25
9.676 10.441
12.210
14.210 15.744 17.744 19.744 21.252 24.252 26.771 29.771 32.270 35.270 37.799 40.799 43.297
切削丝攻（公制细牙）
3 -56 4 -48
5 -44
6 -40 8 -36 10 -32 12 -28 1/4 -28 5/16 -24 3/8 -24 7/16 -20 1/2 -20 9/16 -18 5/8 -18 3/4 -16 7/8 -14 1 -12 11/8 -12
6.384 8.388 11.174 14.658 18.263 23.663 29.822 38.339 44.232 55.844
标准径
最大 最小
6.7 8.7 11.7
15.2
19.0
21.0 24.5 28.2 30.6 35.2 39.2 45.0 51.0 57.0
6.843 8.848 11.890
83.0 85.8 83.0 99.5 80.0 80.0 81.2 84.4 80.3 78.4 80.9 83.6 81.3 80.7 85.3 84.8
螺丝攻牙钻孔径和滚造径对照表
M2.6X0.45 2.20 2.238 2.113
M3.0X0.5 2.50 2.599 2.459
M3.0X0.6 2.40 2.440 2.280
M3.5X0.6 2.90 3.010 2.850
M4.0X0.7 3.30 3.422 3.242
M4.0X0.75 3.25 3.326 3.106
美制细螺纹
规格 (UNF)
标准径
2级牙钻孔径 最大 最小
(番数牙外径)
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
M10X0.5 9.50 9.520 9.400
M11X1.0 10.00 10.153 9.917
M11X0.75 10.30 10.378 10.188
M12X1.5 10.50 10.676 10.376
M12X1.25 10.80 10.912 10.647
规格
M12X1.0 M12X0.5 M14X1.5 M14X1.0 M15X1.5 M15X1.0 M16X1.5 M16X1.0 M17X1.5 M17X1.0 M18X2.0 M18X1.5 M18X1.0 M20X2.0 M20X1.5 M20X1.0 M22X2.0 M22X1.5 M22X1.0 M24X2.0 M24X1.5 M24X1.0 M25X2.0 M25X1.5 M25X1.0 M26X1.5 M27X2.0 M27X1.5 M27X1.0 M28X2.0 M28X1.5 M28X1.0 M30X3.0 M30X2.0 M30X1.5 M30X1.0 M32X2.0 M32X1.5 M33X3.0 M33X2.0 M33X1.5 M35X1.5 M36X3.0 M36X2.0 M36X1.5
最全的攻牙底孔参数
4.959 5.188 6.188 6.917 7.188 7.917 8.188 8.647 8.917 9.188 9.917 10.188 10.376 10.647 10.917 12.376 12.917 13.376 13.917 14.376 14.917 15.376 15.917
5.099 5.378 6.378 7.153 7.378 8.153 8.378 8.912 9.153 9.378 10.153 10.378 10.676 10.912 11.153 12.676 13.153 13.676 14.153 14.676 15.153 15.676 16.153
18
18.2 (85%)
18.5
18.62 (85%)
19
19.13 (80%)
20
20.2 (85%)
20.5
20.62 (85%)
21
21.13 (80%)
22
22.2 (85%)
22.5
22.62 (85%)
23
23.13 (80%)
23
23.2 (85%)
23.5
23.62 (85%)
24
24.13 (80%)
攻牙底孔的使用参数表
1、公制粗牙螺紋
螺纹尺寸
钻头直径
M 1 × 0.25 1.1 × 0.25 1.2 × 0.25 1.4 × 0.3 1.6 × 0.35 1.8 × 0.35
2 × 0.4 2.2 × 0.45 2.5 × 0.45
3 × 0.5 3.5 × 0.6 4 × 0.7 4.5 × 0.75 5 × 0.8
3、美制粗牙螺紋
螺纹尺寸
钻头直径 2B级螺纹下孔徑
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 threadsbecause 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 threadsbecause 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 & UNFthreads, 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 Whitworththreads.● Generally, the tap drill sizes in column A are used for producing holes; When holestend 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 sizeswith a * mark are in accordance with BSW (Please refer to page 135).◎管牙●-1982●●0203-1982 Rp internal thread. 0203-1982 G internal thread.The reccommended tap drill sizesindicated above are for JIS Class A PFthreads.◎管牙● *1The above drill sizes are according to ANSI/ASME BI.20.1-1983 Pipe Threads,General Purpose (inch) (partial listing).● *2The above drill sizes are according to ANSI/ASME BI.20.3-1976 Pipe Threads,(inch) (partial listing).◎ For Threads Using with Helical Coil Wire inserts● The figures listed above are according to the data provided by helical coil wire insertmanufacturers.◎無溝絲攻下孔徑。
螺纹攻牙底孔对照表
32 / /
35 / /
37.5 / /
40.5 / /
43
表2 英制螺纹攻牙底孔对照表 螺纹规格 底孔孔径 N0.1-81 1.55 N0.2-56 1.8 N0.3-48 2.1
N0.03-56 2.1
N0.4-40 2.3
第2页，共3页
螺纹规格 底孔孔径 螺纹规格 底孔孔径 螺纹规格 底孔孔径 螺纹规格 底孔孔径
N0.10-32 3.8
3/16-14 9.4 .7/8-9 19.5 .13/4-5 39.5
3、质量检验
1、产品加工内螺纹时，应分清楚：加工后是否需要进行电镀处理。 2、镀前用相应规格“6Ｇ”的螺纹塞规进行检验，保证通规通，止规止的要求。 3、镀后用相应规格“6Ｈ”的螺纹塞规进行检验，保证通规通，止规止的要求。
N0.5-40 2.6 N0.12-24 4.5 1/2.-13 10.8 .11/8-7 25
N0.6-32 2.8 .1/4-20 5.1 .6/16-12 12.2 .11/4-7 28.2
N0.8-32 3.4 5/16-18 6.6 .5/8-11 13.5 .13/8-6 30.8
N0.10-24 3.8 3./8-16 8.2 .3/4-10 16.5 .11/2-6 34
1、适用范围
本规范适用于公所有产品内螺纹的加工及检测。
2、加工要求
1、内螺纹分公制内螺纹与英制内螺纹。 2、内螺纹的攻牙底孔，见表1、表2。 表1 公制螺纹攻牙底孔对照表 螺纹规格 底孔孔径 螺纹规格 底孔孔径 螺纹规格 底孔孔径 螺纹规格 底孔孔径 螺纹规格 底孔孔径 螺纹规格 底孔孔径 螺纹规格 底孔孔径 螺纹规格 底孔孔径 螺纹规格 底孔孔径 M1× 0.25 0.75 M1.7× 0.35 1.35 M2.5× 0.45 2.1 M4× 0.7 3.3 M6× 1 5 M11× 1.5 9.5 M20× 2.5 17.5 M33× 3.5 M1.1× 0.25 0.85 M1.8× 0.35 1.45 M2.6× 0.45 2.2 M4× 0.75 3.25 M7× 1 6 M12× 1.75 10.3 M22× 2.5 19.5 M36× 4 M1.2× 0.25 0.95 M2× 0.4 1.6 M3× 0.5 2.5 M4.5× 0.75 3.8 M8× 1.25 6.8 M14× 2 12 M24× 3 21 M39× 4 M1.4× 0.3 1.1 M2.2× 0.4 1.75 M3× 0.6 2.4 M5× 0.8 4.2 M9× 1.25 7.8 M16× 2 14 M27× 3 24 M42× 4.5 M1.6× 0.35 1.25 M2.3× 0.4 1.9 M3.5× 0.6 2.9 M5× 0.9 4.1 M10× 1.5 8.5 M18× 2.5 15.5 M30× 3.5 26.5 M45× 4.5
螺纹攻牙底孔对照表
PS 规格最大最小最大最小(新规格Rp)M1.0*0.250.750.7850.72911.0011.15310.9171-64UNC G5 1.76 1.68M1.00.25G40.920.891/16-28 6.5 6.632 6.490M1.1*0.250.850.8850.82911.5011.52011.4002-56G4 2.04 1.96M1.20.25G4 1.11 1.091/8-288.58.6378.495M1.2*0.250.950.9850.92912.5012.67612.3763-48G4 2.35 2.25M1.40.30G4 1.30 1.261/4-1911.411.54911.341M1.4*0.3 1.10 1.142 1.07513.0013.15312.9174-40G5 2.64 2.54M1.60.35G4 1.47 1.433/8-1914.915.05414.846M1.6*0.35 1.25 1.321 1.22113.5013.67613.3765-40G5 2.97 2.87M1.70.35G4 1.57 1.521/2-1418.618.77318.489M1.7*0.35 1.35 1.421 1.32114.0014.15313.9176-32G5 3.22 3.11M1.80.35G4 1.67 1.623/4-1424.024.25923.975M1.8*0.35 1.45 1.521 1.42114.5014.67614.3768-32G6 3.89 3.78M2.00.40G4 1.84 1.791-1130.230.47230.110M2*0.4 1.60 1.679 1.56715.0015.15314.91710-24G6 4.44 4.30M2.20.45G5 2.04 1.9811/4-1138.839.13338.771M2.2*0.45 1.75 1.838 1.71315.5015.67615.37612-24G6 5.07 4.96M2.30.40G4 2.14 2.0911/2-1144.745.02644.664M2.3*0.4 1.90 1.979 1.86716.0016.15315.9171/4〞-20G7 5.86 5.73M2.50.45G5 2.34 2.272-1156.556.83756.475M2.5*0.45 2.10 2.138 2.01316.0016.21015.8355/16〞-18G77.387.23M2.60.45G5 2.44 2.37M2.6*0.45 2.20 2.238 2.11316.5016.67616.3763/8〞-16G78.898.72M3.00.50G5 2.82 2.75M3*0.5 2.50 2.599 2.45917.0017.15316.9177/16〞-14G810.4010.02M3.50.60G5 3.27 3.19M3.5*0.6 2.90 3.010 2.85018.0018.21017.8351/2〞-13G811.9211.70M4.00.70G6 3.72 3.65M4*0.7 3.30 3.422 3.24218.5018.67618.3760-80UNF G5 1.45 1.39M5.00.80G6 4.67 4.59SM1/16 -80 1.25 1.281 1.211M4.5*0.75 3.80 3.878 3.68819.0019.15318.9171-72G5 1.77 1.70M6.0 1.00G7 5.59 5.49SM5/64 -64 1.55 1.593 1.513M5*0.8 4.20 4.334 4.13420.0020.21019.8352-64G4 2.06 1.98M7.0 1.00G7 6.59 6.48SM3/32 -56 1.9 1.936 1.841M6*1.0 5.00 5.153 4.91720.5020.67620.3763-56G4 2.37 2.29M8.0 1.25G77.497.36SM3/32-100 2.1 2.156 2.081M7*1.0 6.00 6.153 5.91721.0021.15320.9174-48G5 2.68 2.59M10 1.5G79.349.22SM1/8 -32 2.3(2.393)(2.233)M8*1.25 6.80 6.912 6.64722.0022.21021.8355-44G5 2.99 2.90M10 1.25G79.499.35SM1/8 -40 2.5 2.551 2.421M9*1.257.807.9127.64722.5022.67622.3766-40G5 3.29 3.19M12 1.75G811.2311.09SM1/8 -44 2.5 2.605 2.485M10*1.58.508.6768.37623.0023.15322.9178-36G5 3.91 3.81M12 1.25G911.5011.36SM1/8 -48 2.6 2.657 2.547M11*1.59.509.6769.37623.0023.21022.83510-32G6 4.53 4.44SM9/64 -32 2.7(2.790)(2.630)M12*1.7510.3010.44110.10623.5023.67623.37612-28G6 5.13 5.03SM9/64 -40 2.9 2.948 2.818M14*2.012.0012.21011.83524.0024.15323.9171/4〞-28G7 6.00 5.91SM11/64-32 3.5 3.584 3.424M16*2.014.0014.21013.83524.5024.67624.3765/16〞-24G77.537.42SM11/64-40 3.7 3.742 3.612M18*2.515.5015.74415.29425.0025.21024.8353/8〞-24G79.108.99使用铰刀时不使用铰刀时SM3/16 -24 3.6 3.658 3.498M20*2.517.5017.74417.29425.5025.67625.3767/16〞-20G810.6210.481/16-27 5.94 6.15 6.35SM3/16 -28 3.8 3.844 3.684M22*2.519.5019.74419.29426.0026.15325.9171/2〞-20G812.2012.061/8-278.338.438.74SM3/16 -32 3.9 3.980 3.820M24*3.021.0021.25220.75226.0026.21025.8351/4-1810.7211.1311.13SM3/16 -40 4.05 4.138 4.008M27*3.024.0024.25223.75226.5026.67626.3763/8-1814.2714.2714.68SM7/32-32 4.7 4.774 4.614M30*3.526.5026.77126.21127.0027.15326.9171/2-1417.4817.8618.26SM15/64-28 5.0 5.055 4.875M33*3.529.5029.77129.21127.0027.25226.752最大最小3/4-1422.6323.0123.42SM1/4-24 5.2 5.266 5.086M36*4.032.0032.27031.67028.0028.21027.835No.12-32 4.70 4.826 4.8231-11-1/228.5828.9829.36SM1/4-28 5.4 5.452 5.272M39*4.035.0035.27034.67028.5028.67628.3761/4-32 5.60 5.689 5.4871-1/4-11-1/237.3137.6938.10SM1/4-40 5.6 5.726 5.59629.0029.15328.9175/16-327.107.2647.0871-1/2-11-1/243.2643.6644.45SM9/32-20 5.7 5.824 5.63430.0030.21029.8353/8-328.708.8648.6622-11-1/255.1755.5856.36SM9/32-28 6.2 6.256 6.06630.5030.67630.3767/16-2810.2010.33710.135SM5/16-18 6.3 6.444 6.254最大最小30.0030.25229.7521/2-2811.8011.93811.710SM5/16-24 6.8 6.864 6.674M1.0*0.20.800.8210.78331.0031.21030.8359/16-2413.2013.38511.132SM5/16-28 6.97.050 6.860M1.1*0.20.900.9210.88331.5031.67631.3765/8-2414.8014.96814.732SM11/32-287.77.8437.653M1.2*0.2 1.00 1.0210.98333.5033.67633.3763/4-2017.8017.95717.679SM3/8-187.98.0537.843M1.4*0.2 1.20 1.221 1.18333.0033.25232.7527/8-2021.0021.13220.854(新规格Rc)使用铰刀时不使用铰刀时SM3/8-288.58.6378.447M1.6*0.2 1.40 1.421 1.38334.0034.21033.8351-2024.0024.30724.0291-16-28 6.1 6.2 6.244 6.384SM7/16-169.39.4409.220M1.7*0.2 1.45 1.500 1.46034.5034.67634.3761/8-288.18.28.2498.388SM7/16-2810.110.22410.034M1.8*0.2 1.60 1.621 1.5831/4-1910.711.010.96211.174SM1/2-1210.310.42010.180M2.0*0.25 1.75 1.785 1.7293/8-1914.214.514.44814.658SM1/2-2011.311.41011.190M2.2*0.25 1.95 1.985 1.929最大最小1/2-1417.618.017.97918.263SM1/2-2811.711.81211.622M2.3*0.35 2.05 2.061 2.001最大最小1.55 1.582 1.4253/4-1423.023.523.37823.663SM9/16-2012.913.01812.778M2.5*0.35 2.20 2.221 2.121 1.25 1.305 1.1821.80 1.871 1.6951-1129.029.529.45929.822M2.6*0.35 2.20 2.246 2.186 1.55 1.612 1.4742.10 2.146 1.941 1 1/4-1137.538.037.97638.339M3.0*0.35 2.70 2.721 2.621 1.85 1.912 1.7562.30 2.385 2.157 1 1/2-1143.444.043.86944.232M3.5*0.35 3.50 3.599 3.459 2.10 2.197 2.0252.60 2.697 2.4872-1154.955.555.41255.844硬材软材M4.5*0.5 4.00 4.0993.959 2.40 2.458 2.2712.80 2.895 2.642W1/8-40 2.65 2.60M5.0*0.5 4.50 4.599 4.459 2.70 2.740 2.5513.40 3.530 3.302PF 规格W5/32-32 3.25 3.20M5.5*0.5 5.00 5.0994.959 2.90 3.022 2.8203.90 3.962 3.683(新规格G)W3/16-24 3.75 3.70M6.0*0.5 5.50 5.550 5.400 3.50 3.606 3.4044.50 4.597 4.3441/16-28 6.7 6.843 6.561W1/4-205.10 5.00M6.0*0.75 5.30 5.378 5.188 4.10 4.165 3.9631/4-20 5.10 5.257 4.9791/8-288.78.8488.566W5/16-18 6.60 6.50M7.0*0.5 6.50 6.550 6.400 4.60 4.724 4.4965/16-18 6.60 6.731 6.4011/4-1911.711.89011.445W3/8-168.007.90M7.0*0.75 6.30 6.378 6.1881/4-28 5.50 5.588 5.3603/8-168.008.1537.7983/8-1915.215.39514.950W7/16-149.409.30M8.0*0.57.507.5207.4005/16-24 6.907.035 6.7827/16-149.409.5509.1441/2-1419.019.17218.631W1/2-1210.7010.50M8.0*0.757.307.3787.1883/8-248.508.6368.3821/2-1310.9011.02310.5925/8-1421.021.12820.587W9/16-1212.3012.00M8.0*1.07.007.153 6.9177/16-209.9010.0339.7299/16-1212.2012.44611.9893/4-1424.524.65824.117W5/8-1113.7013.50M9.0*0.758.308.3788.1881/2-2011.5011.60711.3295/8-1113.6013.86813.3867/8-1428.228.41827.877W3/4-1016.7016.50M9.0*1.08.008.1537.9179/16-1812.9013.08112.7513/4-1016.6016.84016.3071-1130.630.93130.291W7/8-919.5019.30M10*0.59.509.5209.4005/8-1814.5014.68114.3517/8-919.6019.76119.17711/8-1135.235.57934.939W1-822.4022.00M10*0.759.309.3789.1883/4-1617.5017.67817.3231-822.3022.60621.97111/4-1139.239.59238.952W1-1/8-725.0024.80M10*1.09.009.1538.9177/8-1420.5020.67520.2701-1/8-725.0025.34924.63811/2-1145.045.48544.845W1-1/4-728.3028.00M10*1.258.808.9128.6471-1223.3023.57123.1141-1/4-728.2028.52427.81313/4-1151.051.42850.788M11*1.010.0010.1539.9171-1/8-1226.5026.74626.2891-3/8-630.8031.11530.3532-1157.057.29656.656M11*0.7510.3010.37810.1881-1/4-1229.6029.92129.4641-1/2-634.0034.29033.528M12*1.510.5010.67610.3761-3/8-1232.8033.09632.6391-3/4-539.5039.82738.964M12*1.2510.8010.91210.6471-1/2-1236.0036.27135.8142-4-1/245.2045.59344.679标准径最大最小No.10-24(4.826)No.12-24(5.486)No.10-32(4.826)No.12-28(5.486)英制螺纹规格钻孔径螺 纹 攻 牙 底 孔 对 照 表PT 规格標准徑有效牙部之長度(最小)中之母螺牙內徑標准長度(最小)中之母螺牙內徑公制粗螺纹2级牙钻孔径规格标准径No.8-32(4.166)(UNEF)美制细螺纹No.4-40(2.845)No.5-40(3.175)美制粗螺纹标准径2级牙钻孔径M30*3.0M33*3.0No.6-32(3.505)规格(UNF)M15*1.0M16*1.5M22*1.5M22*1.0M24*2.0公制细螺纹M17*1.5M17*1.0M18*2.0M18*1.5M20*2.0M20*1.5M20*1.0M18*1.0M22*2.0公制细螺纹标准径2级牙钻孔径M16*1.0规格M12*1.0M12*0.5M14*1.5M14*1.0M15*1.5M24*1.5M24*1.0M25*2.0M25*1.5M25*1.0M26*1.5M27*2.0M27*1.5M27*1.0M28*2.0M28*1.5M28*1.0M32*1.5M33*2.0M36*1.5M30*2.0M30*1.5M30*1.0M32*2.0M33*1.5M35*1.5M36*3.0M36*2.0规格规格(UNC)No.2-64(2.184)No.8-36(4.166)规格规格标准径2级牙钻孔径No.3-56(2.515)No.4-48(2.845)No.5-44(3.175)No.6-40(3.505)美制迫牙丝攻钻孔径No.1-64(1.854)No.2-56(2.184)2级牙钻孔径精度最大最小美制特细螺纹标准径No.3-48(2.515)标准径2级牙钻孔径No.1-72(1.854)No.0-80(1.524)英制管螺纹标准径最大最小NPT 公制迫牙丝攻钻孔径规格精度最大最小NPS 美制管螺纹规格钻孔径針車用螺纹规格标准径最大最小。