最实用对照!

螺丝攻牙钻孔径和滚丝径对照表

公制粗螺纹 美制粗螺纹

规格 标准径 2级牙钻孔径 规格（UNC） 标准径 2级牙钻孔径

最大 最小 最大 最小

M1.0×0.25 0.75 0.785 0.729 NO.1-64(1.854) 1.55 1.582 1.425 M1.1×0.25 0.85 0.885 0.829 NO.2-56(2.184) 1.80 1.871 1.695 M1.2×0.25 0.95 0.985 0.985 NO.3-48(2.515) 2.10 2.146 1.941 M1.4×0.3 1.10 1.142 1.075 NO.4-40(2.845) 2.30 2.385 2.157 M1.6×0.35 1.25 1.321 1.221 NO.5-40(3.175) 2.60 2.697 2.487 M1.7×0.35 1.35 1.421 1.321 NO.6-32(3.505) 2.80 2.895 2.642 M1.8×0.35 1.45 1.521 1.421 NO8-32(4.166) 3.40 3.53 3.302 M2.0×0.4 1.60 1.679 1.567 NO.10-24(4.826) 3.90 3.962 3.683 M2.2×0.45 1.75 1.838 1.713 NO.12-24(5.486) 4.50 4.597 4.344 M2.3×0.4 1.90 1.979 1.867 1/4-20 5.10 5.257 4.979

M2.5×0.45 2.10 2.138 2.013 5/16-18 6.60 6.731 6.401

M2.6×0.45 2.20 2.238 2.113 3/8-16 8.00 8.153 7.798

M3.0×0.5 2.50 2.599 2.459 7/16-14 9.40 9.55 9.144

M3.0×0.6 2.40 2.440 2.280 1/2-13 10.80 11.023 10.592 M3.5×0.6 2.90 3.010 2.850 9/16-12 12.20 12.446 11.989 M4.0×0.7 3.30 3.422 3.242 5/8-11 13.60 12.868 13.386 M4.0×0.75 3.25 3.326 3.106 3/4-10 16.50 18.840 16.307 M4.5×0.75 3.80 3.878 3.688 7/8-9 19.50 19.761 19.177 M5.0×0.8 4.20 4.334 4.134 1 22.20 22.606 21.971

M5.0×0.9 4.10 4.170 3.930 1-1/8-7 25.00 25.349 24.638 M6.0×1.0 5.00 5.153 4.917 1-1/4-7 28.20 28.524 27.813 M7.0×1.0 6.00 6.153 5.917 1-3/8-6 30.80 31.115 30.353 M8.0×1.25 6.80 6.912 6.647 1-1/2-6 34.00 34.290 33.528 M9.0×1.25 7.80 7.912 7.647 1-3/4-5 39.50 39.827 38.964 M10×1.5 8.50 8.676 8.376 2-4-1/2 45.20 45.593 44.679 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 11.835

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 20.752

M27×3.0 24.00 24.252 23.752

M30×3.5 26.50 26.771 26.211

螺丝攻牙钻孔径和滚丝径对照表

公制细螺纹 美制细螺纹

规格 标准径 2级牙钻孔径 规格（UNC） 标准径 2级牙钻孔径

最大 最小 最大 最小

M1.0×0.2 0.80 0.821 0.783 NO.0-80(1.524) 1.25 1.305 1.182

最实用对照!

M1.1×0.2 0.90 0.921 0.883 NO.1-72(1.854) 1.55 1.612 1.474 M1.2×0.2 1.00 1.021 0.983 NO.2-64(2.184) 1.85 1.912 1.756 M1.4×0.2 1.20 1.221 1.183 NO.3-56(2.515) 2.10 2.197 2.025 M1.6×0.2 1.40 1.421 1.383 NO.4-48(2.845) 2.40 2.458 2.271 M1.7×0.2 1.45 1.500 1.460 NO.5-44(3.175) 2.70 2.740 2.551 M1.8×0.2 1.60 1.621 1.583 NO.6-40(3.505) 2.90 3.022 2.820 M2.0×0.25 1.75 1.785 1.729 NO.8-36(4.166) 3.50 3.606 3.404 M2.2×0.25 1.95 1.985 1.929 NO.10-32(4.826) 4.10 4.165 3.963 M2.3×0.25 2.05 2.061 2.001 NO.12-28(5.846) 4.60 4.724 4.496 M2.5×0.35 2.20 2.221 2.121 1/4-28 5.50 5.588 5.360 M2.6×0.35 2.20 2.246 2.186 5/16-24 6.90 7.035 6.782 M3.0×0.35 2.70 2.721 2.621 3/8-24 8.50 8.636 8.382 M3.5×0.35 3.20 3.221 3.121 7/16-20 9.90 10.033 9.729 M4.0×0.5 3.50 3.599 3.459 1/2-20 11.50 11.607 11.329 M4.5×0.5 4.00 4.099 3.959 9/16-18 12.90 13.081 12.751 M5.0×0.5 4.50 4.599 4.459 5/8-18 14.50 14.681 14.351 M5.5×0.5 5.00 5.099 4.959 3/4-16 17.50 17.678 17.323 M6.0×0.75 5.30 5.378 5.188 7/8-14 20.50 20.675 20.270 M6.0×0.5 5.50 5.550 5.400 1-12 23.20 23.571 23.114

M7.0×0.75 6.30 6.378 6.188 1-1/8-12 26.50 26.746 26.289 M7.0×0.5 6.50 6.550 6.400 1-1/4-12 29.50 29.921 29.464 M8.0×1.0 7.00 7.153 6.917 1-3/8-12 32.80 33.096 32.639 M8.0×0.75 7.30 7.378 7.188 1-1/2-12 36.00 36.271 35.814 M8.0×0.5 7.50 7.520 7.400

M9.0×1.0 8.00 8.153 7.917

M9.0×0.75 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

M12×1.5 10.50 10.676 10.376

M12×1.25 10.80 10.912 10.647

M12×1.0 11.00 11.153 10.917

M12×0.5 11.50 11.520 11.400

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

最实用对照!

M18×2.0 16.00 16.210 15.835 M18×1.5 16.50 16.676 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 M22×2.0 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

M24×1.5 22.50

M24×1.0 23.00

M25×2.0 23.00

M25×1.5 23.50

M25×1.0 24.00

M26×1.5 24.50

M27×2.0 25.00

M27×1.5 25.50

M27×1.0 26.00

M28×2.0 26.00

M28×1.5 26.50

M28×1.0 27.00

M30×3.0 27.00

M30×2.0 28.00

M30×1.5 28.50

M30×1.0 29.00

M32×2.0 30.00

M32×1.5 30.50

M33×3.0 30.00

M33×2.0 31.00

M33×1.5 31.50

M35×1.5 33.50

M36×3.0 33.00

M36×2.0 34.00

M36×1.5 34.50

22.210 22.676 23.153 23.210 23.676 24.153 24.676 25.210 25.676 26.153 26.210 26.676 27.153 26.917 27.252 26.752 28.210 28.676 29.153 30.210 30.676 30.252 31.210 31.676 33.676 33.252 34.210 34.676 21.835 22.376 22.917 22.835 23.376 23.917 24.376 24.835 25.376 25.917 25.835 26.376 27.835 28.376 28.917 29.835 30.376 29.752 30.835 31.376 33.376 32.752 33.835 34.376