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M1:粗扣螺距 0.25=Φ0.75 細(xì)扣螺距 0.2=Φ0.8 M2:粗扣螺距 0.4=Φ1.6 細(xì)扣螺距 0.25=Φ1.8 M3:粗扣螺距 0.5=Φ2.5 細(xì)扣螺距 0.35=Φ2.7 M4:粗扣螺距 0.7=Φ3.3 細(xì)扣螺距 0.5=Φ3.5 M5:粗扣螺距 0.8=Φ4.2 細(xì)扣螺距 0.5=Φ4.5 M6:粗扣螺距 1=Φ5 細(xì)扣螺距 0.75=Φ5.2 M8:粗扣螺距 1.25=Φ6.7 細(xì)扣螺距 1,0.75=Φ7,Φ7.2 M10:粗扣螺距 1.5=Φ8.5 細(xì)扣螺距 1.25,1,0.75=Φ 8.7,Φ9,Φ9.2 M12:粗扣螺距 1.75=Φ10.2 細(xì)扣螺距 1.5,1.25,1=Φ10.5,Φ10.7,Φ11 M14:粗扣螺距 2=Φ 11.9 細(xì)扣螺距 1.5,1.25,1=Φ12.5,Φ12.7,Φ13 M16:粗扣螺距 2=Φ 1