公制美制英制螺纹攻丝打孔对照

公制美制英制螺纹对照及钻孔 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 ...