螺纹底孔对照表

1.0牙距1.5牙距2.0牙距公称尺寸公称尺寸公称尺寸中国（旧）中国（新）日本中国（旧）中国（新）M21.6M87M1210.5M2018ZG1/8″Rc1/8″PT1/8″8.4G1/8″8.6Z1/8″NPT1/8″8.4M2.52M109M1412.5M2220ZG1/4″Rc1/4″PT1/4″11G1/4″11.7Z1/4″NPT1/4″11.1M32.5M1211M1614.5M2422ZG3/8″Rc3/8″PT3/8″14.5G3/8″15.2Z3/8″NPT3/8″14.6M43.3M1413M1816.5M2725ZG1/2″Rc1/2″PT1/2″18G1/2″18.8Z1/2″NPT1/2″18.1M54.2M1615M2018.5M3028ZG3/4″Rc3/4″PT3/4″23.5G3/4″24.3Z3/4″NPT3/4″23.5M65M1817M2220.5M3331ZG1″Rc1″PT1″29.5G1″30.5Z1″NPT1″29.4M86.8M2019M2422.5M3634ZG11/4″Rc11/4″PT11/4″38G11/8″35.2Z11/4″NPT11/4″38.2M108.5M2221M2725.5M4240ZG11/2″Rc11/2″PT11/2″44G11/4″39.2Z11/2″NPT11/2″44.3M1210.2M2423M3028.5M4846ZG2″Rc2″PT2″56G11/2″45.1Z2″NPT2″56.3M1412M2726M3331.5M5250ZG21/2″Rc21/2″PT21/2″72G13/4″51M1614M3029M3634.5ZG3″Rc3″PT3″84G2″56.9M1815.5M4240.5G21/4″62.95M2017.5M4846.5G21/2″72.45M2421G23/4″78.8M2724G3″85.2M3026.5M3329.5M3632Rp1/166.5M4237.5Rp1/224M4843Rp1/411.4M5247Rp3/414.9M5650.5Rp1/88.5M6458Rp3/814.9G------英制非密封管螺纹圆锥管螺纹孔（55°）公称尺寸R------英制一般密封管螺纹Rc-----英制密封圆锥内螺纹Rp-----英制密封圆柱内螺纹平行管内螺纹螺纹底孔对照表(更新版)普通牙螺纹孔普通细牙螺纹孔公称尺寸底孔(D)底孔(D)底孔(D)底孔(D)底孔(D)底孔(D)布锥管螺纹孔（60°）圆柱管螺纹孔（55°）公称尺寸公称尺寸底孔(D)