公制螺纹钻底孔用钻头直径尺
寸表(总2页)
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公制螺纹钻底孔用钻头直径尺寸表
M1:粗扣螺距0.25＝Φ0.75 细扣螺距0.2＝Φ0.8
M2:粗扣螺距0.4＝Φ1.6 细扣螺距0.25＝Φ1.8
M3:粗扣螺距0.5＝Φ2.5 细扣螺距0.35＝Φ2.7
M4:粗扣螺距0.7＝Φ3.3 细扣螺距0.5＝Φ3.5
M5:粗扣螺距0.8＝Φ4.2 细扣螺距0.5＝Φ4.5
M6:粗扣螺距1.0＝Φ5.0 细扣螺距0.75＝Φ5.2
M8:粗扣螺距1.25＝Φ6.7 细扣螺距1.0 , 0.75＝Φ7,Φ7.2
M10:粗扣螺距1.5＝Φ8.5 细扣螺距1.25 , 1.0 , 0.75＝Φ8.7,Φ9,Φ9.2
M12:粗扣螺距1.75＝Φ10.2 细扣螺距1.5 , 1.25 , 1.0＝Φ10.5,Φ10.7,Φ11 M14:粗扣螺距2.0＝Φ11.9 细扣螺距1.5 , 1.25 , 1.0＝Φ12.5,Φ12.7,Φ13 M16:粗扣螺距2.0＝Φ14 细扣螺距1.5 , 1.0＝Φ14.5,Φ15
M18:粗扣螺距2.5＝Φ15.4 细扣螺距2.0 ,1.5 ,1.0＝Φ15.9,Φ16.5,Φ17
M20:粗扣螺距2.5＝Φ17.4 细扣螺距2.0 , 1.5 , 1.0＝Φ17.9,Φ18.5,Φ19
M22:粗扣螺距2.5＝Φ19.5 细扣螺距2.0 , 1.5 , 1.0＝Φ19.9,Φ20.5,Φ21
M24:粗扣螺距3.0＝Φ20.9 细扣螺距2.0 , 1.5 , 1.0＝Φ21.9,Φ22.5,Φ23生产中钻螺纹底孔公式：
t＜1mm: Dz=d-t
t＞1mm: Dz=d-(1.04~1.06)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
公称直径d 螺距t 钻头直径公称直径d 螺距t 公称直径d
M1 粗 0.25 =0.75 M2 粗 0.4 =1.6
细 0.2 =0.8 细 0.25 =1.75
M3 粗 0.5 =2.5 M4 粗 0.7= 3.3
细 0.35 =2.65 细 0.5 =3.5
M5 粗 0.8 =4.2 M6 粗 1.0 =5.0
细 0.5 =4.5 细 0.75 =5.2
M8 粗 1.25 =6.7 M10 粗 1.5 =8.5
细 1.0 =7.0 细 1.25 =8.7
细 0.75 =7.2 细 1.0 =9.0
细 0.75 =9.2
M12 粗 1.75 =10.2 M14 粗 2.0 =11.9
细 1.5 =10.5 细 1.5 =12.5
细 1.25 =10.7 细 1.25 =12.7
细 1.0 =11.0 细 1.0 =13.0
M16 粗 2.0 =13.9 M18 粗 2.5 =15.4
细 1.5 =14.5 细 2.0 =15.9
细 1.0 =15.0 细 1.5 =16.5
细 1.0 =17.0
M20 粗 2.5 =17.4 M22 粗 2.5 =19.4
细 2.0 =17.9 细 2.0 =19.9
细 1.5 =18.5 细 1.5 =20.5 细 1.0 =19.0 细 1.0 =21.0 M24 粗 3.0 =20.9 M27 粗 3.0 =23.9 细 2.0 =21.9 细 2.0 =24.9 细 1.5 =22.5 细 1.5 =25.5 细 1.0 =23.0 细 1.0 =26.0 M30 粗 3.5 =26.3 M33 粗 3.5 =29.3 细 3.0 =26.9 细 3.0 =29.9 细 2.0 =27.9 细 2.0 =30.9 细 1.5 =28.5 细 1.5 =31.5 细 1.0 =29.0
M36 粗 4.0 =31.8 M39 粗 4.0 =34.8 细 3.0 =32.9 细 3.0 =35.9 细 2.0 =33.9 细 2.0 =36.9 细 1.5 =34.5 细 1.5 =37.5 M42 粗 4.5 =37.3 M45 粗 4.5 =40.3 细 4.0 =37.8 细 4.0 =40.8 细 3.0 =38.9 细 3.0 =41.9 细 2.0 =39.9 细 2.0 =42.9 细 1.5 =40.5 细 1.5 =43.5 M48 粗 5.0 =42.7 M52 粗 5.0 =46.7 细 4.0 =43.8 细 4.0 =47.8 细 3.0 =44.9 细 3.0 =48.9 细 2.0 =45.9 细 2.0 =49.9 细 1.5 =46.5 细 1.5 =50.5
