公制螺纹钻底孔用钻头直径尺寸表培训讲学

1、公制螺纹钻底孔用钻头直径尺寸表公制螺纹钻底孔用钻头直径尺寸表M1:粗扣螺距0.2520.75细扣螺距0.2=0.8M2:粗扣螺距0.4=(D1.6细扣螺距0.25=（D1.8M3:粗扣螺距0.5=<D2.5细扣螺距0.35=2.7M4:粗扣螺距0.7=(D3.3细扣螺距0.5=3.5M5:粗扣螺距0.8=(D4.2细扣螺距0.5=4.5M6:粗扣螺距1.0=(D5.0细扣螺距0.75=5.2M8:粗扣螺距1.25=(D6.7细扣螺距1.0,0.75=7,7.2M10:粗扣螺距1.5=<D8.5细扣螺距1.25,1.0,0.75=(D8.7,9,9.2M12:粗扣螺距1.75=(D1

2、0.2细扣螺距1.5,1.25,1.0=(D10.5,10.7,11M14:粗扣螺距2.0=(D11.9细扣螺距1.5,1.25,1.0=(D12.5,12.7,13M16:粗扣螺距2.0=(D14细扣螺距1.5,1.0=(D14.5,15M18:粗扣螺距2.5=(D15.4细扣螺距2.0,1.5,1.0=(D15.9,16.5,17M20:粗扣螺距2.5=(D17.4细扣螺距2.0,1.5,1.0=(D17.9,18.5,19M22:粗扣螺距2.5=(D19.5细扣螺距2.0,1.5,1.0=(D19.9,20.5,21M24:粗扣螺距3.0=20.9生产中钻螺纹底孔公式：tv1mm:Dz=

3、d-tt>1mm:Dz=d-（1.041.06）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细扣螺距2.0,1.5,1.0=(D21.9,22.5,23公称直径d螺距t钻头直径M1粗0.25=0.75M2细0.2=0.8M3粗0.5=2.5M4细0.35=2.65M5粗0.8=4.2M6细0.5=4.5M8粗1.25=6.7M10细1.0=7.0细0.75=7.2细0.75=9.2M12粗1.75=10.2M14细1.5=10.5细1.25=10.7细1.0=11.0公称直径d螺距t公称直径粗0.4=1.6细0.25=1.75粗0.7

4、=3.3细0.5=3.5粗1.0=5.0细0.75=5.2粗1.5=8.5细1.25=8.7细1.0=9.0粗2.0=11.9细1.5=12.5细1.25=12.7细1.0=13.0M16粗2.0=13.9细1.5=14.5细1.0=15.0细1.0=17.0M18粗2.5=15.4细2.0=15.9细1.5=16.5M20粗2.5=17.4M22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=21.0M24粗3.0=20.9M27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=26.0M30粗3.5=26.3M33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=29.0M36粗4.0=31.8M39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=37.5M42粗4.5=37.3M45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=43.5M48粗5.0=42.7M52粗5.