镶丝套螺纹底孔参照表螺纹护套在安装之前，钻孔环节参考选用使用表中所列的标准钻头钻孔，钻孔深度大于或等于螺纹护套安装深度；注意不要将孔钻成锥形，切屑不要掉入。钻孔后锪孔不应超过0.4螺距深度，因为锪孔过大不利于螺纹护套的旋入。螺纹规格M2*0.4M2.5*0.45M3*0.5M4*0.7M5*0.8M6*1M7*1M8*1.0M8*1.25M10*1.0M10*1.5M10*1.25M11*1.5M12*1.0M12*1.25M12*1.5M12*1.75M13*1.25钻头直径(mm)2.12.63.14.25.26.37.38.38.310.310.410.311.412.312.312.412.413.3螺纹规格M14*1.25M14*1.5M14*2M16*1.5M16*2M18*1.5M18*2.5M20*1.5M20*2.0M20*2.5M22*1.5M22*2钻头直径(mm)14.314.414.516.416.518.418.620.420.520.622.422.5