螺纹攻丝底孔对照表螺纹规格 钻头直径M1.6X0.35 1.25M2 X0.4 1.6M2.5X0.45 2.05M3 X0.5 2.5M3.5X0.6 2.9M4 X0.7 3.3M5 X0.8 4.2M6 X1 5M8 X1.25 6.8M8 X1 7M10 X1.5 8.5M10 X1.25 8.8M12 X1.75 10.2M12 X1.50 10.5M12 X1.25 10.8M14 X2 12M14 X1.5 12.5M16 X2 14M16 X1.5 14.5M18 X2.5 15.5M18 X1.5 16.5M20 X2.5 17.5M20 X1.5 18.5M22 X2.5 19.5M22 X1.5 20.5M24 X3 21M24 X2 22M27 X3 24M27 X2 25M30 X3.5 26.5M33 X3.5 29.3M36 X4 31.8M39 X4 34.8M42 X4.5 37.3
