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1、螺纹规格普通切削丝锥挤牙丝锥（非圆丝锥）钻头直径孔径钻头直径孔径（一级螺纹）孔径（二级螺纹）MlxO.25g750.7290.785M1.4x0.3申1.11.0751.1421.2441.263申1.270申1.294M1.7xO.35申1.351.3211.421申1.51申1.54申1.54申1.58M2x0.4申1.61.5671.679申1.78申1.82申1.81申1.85M2.3x0.4申1.91.8671.979申2.08申2.12申2.11申2.15M2.5x0.45申2.12.0132.138申2.25申2.39申2.28申2.43M3x0.5申2.42.2802.440申
2、2.74申2.78申2.76申2.812.48-2.59M3.5x0.6申2.92.8503.010申3.18申3.21申3.20申3.26M4x0.7申3.253.1063.326申3.63申3.67申3.65申3.70M4x0.75申3.33.2423.422M5x0.9申4.13.9304.170M5x0.8申4.24.1344.334申4.57申4.62申4.59申4.66M6x1申54.9175.153申5.45申5.51申5.48申5.57M7x1申65.9176.153申6.45申6.51申6.48申6.57M8x1.25申6.86.6476.912申7.31申7.38申7.34
3、申7.41M8x1申76.9177.153申7.45申7.51申7.48申7.57M10x1.5申&58.3768.676申9.16申9.22申9.18申9.28M10x1.25申&88.6478.912申9.31申9.38申9.34申9.41M10x1申98.917申9.46申9.52申9.48申9.579.153M12X1.75申10.310.10611.0111.08申11.05申11.1510.441M12X1.5申10.510.37611.1611.2211.1811.2810.676M12X1.25申10.810.647申11.3111.3811.3411.4110.912M12x
4、1申1110.917申11.4611.52申11.48申11.5711.153M14x2申1211.835申12.8312.95申12.92申13.0412.210M14X1.5申12.512.376申13.1613.22申13.21申13.3012.676M16x2申1413.835申14.8714.95申14.92申15.0414.210M16X1.5申14.514.376申15.1615.22申15.21申15.3014.676M18x2.5申15.515.294申16.5716.67申16.63申16.7815.744M18X1.5申16.516.376申17.1717.2317.22
5、17.3116.676M20X2.5申17.517.294申18.5718.67申18.63申18.7817.744M20X1.5申18.518.376申19.1719.2319.2219.3118.676M22X2.5申19.519.294一切削丝锥攻牙螺纹底径二挤牙丝锥螺纹攻牙底径简易19.744简易计算公式：计算公式：M24x3申2120.75221.252外径-（牙距X0.850.95）=螺外径-（牙距X0.4250.475）=螺纹M27x3申2423.752纹底径；底径；24.252M30X3.5申26.526.211例M6X1.0例M6X1.026.771M6-(1.0x0.425
6、)=5.575M36x4申3231.670M6-(1.0x0.85)=5.1532.270（最大孔径）（最大孔径）M6-(1.0x0.95)=5.05M6-(1.0x0.475)=5.525（最小孔径）（最小孔径）三切削速度简易计算公式：M42x4.5申37.537.12937.799切削回转速=（S+L）x5001M45x4.5申40.540.12940.799Dxn例:螺纹丝攻为HSS,被切削材料为低碳钢切削速度为S,8m/minL,14m/minEX-SFTM6xl.0M48x5申4342.58743.297切削速度=(8+14)*5006x3.1416=1100018.85=583RPM
