螺纹孔底孔尺寸表 中国（旧）中国（新）日本中国（旧）中国（新） M5×0.84.2M8×17.0M12×1.510.5M20×218.0ZG1/8″Rc1/8″PT1/8″8.4G1/8″8.6Z1/8″NPT1/8″8.4 M6×15.0M10×19.0M14×1.512.5M22×220.0ZG1/4″Rc1/4″PT1/4″11.0G1/4″11.7Z1/4″NPT1/4″11.1 M8×1.256.8M12×111.0M16×1.514.5M24×222.0ZG3/8″Rc3/8″PT3/8″14.5G3/8″15.2Z3/8″NPT3/8″14.6 M10×1.58.5M14×113.0M18×1.516.5M27×225.0ZG1/2″Rc1/2″PT1/2″18.0G1/2″18.8Z1/2″NPT1/2″18.1 M12×1.7510.2M16×115.0M20×1.518.5M30×228.0ZG3/4″Rc3/4″PT3/4″23.5G3/4″24.3Z3/4″NPT3/4″23.5 M14×212.0M18×117.0M22×1.520.5M33×231.0ZG1″Rc1″PT1″29.5G1″30.5Z1″NPT1″29.4 M16×214.0M20×119.0M24×1.522.5M36×234.0 ZG1 1/4″Rc1 1/4″PT1 1/4″ 38.0 G1 1/8″ 35.2 Z1 1/4″NPT1 1/4″ 38.2 M18×2.515.5M22×121.0M27×1.525.5M42×240.0 ZG1 1/2″Rc1 1/2″PT1 1/2″ 44.0 G1 1/4″ 39.2 Z1 1/2″NPT1 1/2″ 44.3 M20×2.517.5M24×123.0M30×1.528.5M48×246.0ZG2″Rc2″PT2″56.0 G1 1/2″ 45.1Z2″NPT2″56.3 M24×321.0M27×126.0M33×1.531.5M52×250.0 ZG2 1/2″Rc2 1/2″PT2 1/2″ 72.0 G1 3/4″ 51 M27×324.0M30×129.0M36×1.534.5ZG3″Rc3″PT3″84.0G2″56.9 M30×3.526.5M42×1.540.5M30×327.0 G1 1/4″ 62.95 M33×3.529.5M48×1.546.5M33×330.0 G2 1/2″ 72.45 M36×432.0M36×333.0 G2 3/4″ 78.8 M42×4.537.5M42×339.0G3″85.2 M48×543.0M48×345.0 M52×547.0M52×349.0 M56×5.550.5 M64×658.0 公称尺寸 底孔d 布锥管螺孔 攻丝前钻孔尺寸 底孔d公称尺寸底孔d底孔d 攻丝前钻孔尺寸 公称尺寸 攻丝前钻孔尺寸 底孔d 圆锥管螺孔圆柱管螺孔普通粗牙螺孔 攻丝前钻孔尺寸攻丝前钻孔尺寸 公称尺寸底孔d公称尺寸 普通细牙螺孔 公称尺寸底孔d公称尺寸 。