M2:==:==:==:==:粗扣螺距1==:=,=Φ7,:=,1,=,Φ9,:=,,1=,,Φ11M14:粗扣螺距2=,,1=,,Φ13M16:粗扣螺距2=,1=,Φ15M18:=,,1=,,Φ17M20:=,,1=,,Φ19M22:=,,1=,,Φ21M24:粗扣螺距3=,,1=,,Φ23生产中钻螺纹底孔公式:t<1mm:Dz=d-tt>1mm:Dz=d-(~)t式中t螺距(毫米)Dz攻丝前钻头直径(毫米)d螺纹公称直径(毫米)
公制螺纹钻底孔用钻头直径尺寸表 来自淘豆网m.daumloan.com转载请标明出处.