螺纹孔底尺寸表普通粗牙螺孔普通细牙螺孔圆锥管螺孔圆柱管螺孔布锥管螺孔攻丝前钻孔尺寸攻丝前钻孔尺寸攻丝前钻孔尺寸攻丝前钻孔尺寸攻丝前钻孔尺寸公称尺寸底孔 d公称尺寸底孔 d公称尺寸底孔 d公称尺寸底孔 d 公称尺寸底孔 d公称尺寸底孔 d 公称尺寸底孔 d 中国(旧)中国(新)日本中国(旧)中国(新) M5 × M8 × M12 × M20 × ZG1/8 ″ Rc1/8 ″ PT1/8 ″ G1/8 ″ Z1/8 ″ NPT1/8 ″ M6 × M10 × M14 × M22 × ZG1/4 ″ Rc1/4 ″ PT1/4 ″ G1/4 ″ Z1/4 ″ NPT1/4 ″ M8 × M12 × M16 × M24 × ZG3/8 ″ Rc3/8 ″ PT3/8 ″ G3/8 ″ Z3/8 ″ NPT3/8 ″ M10 × M14 × M18 × M27 × ZG1/2 ″ Rc1/2 ″ PT1/2 ″ G1/2 ″ Z1/2 ″ NPT1/2 ″ M12 × M16 × M20 × M30 × ZG3/4 ″ Rc3/4 ″ PT3/4 ″ G3/4 ″ Z3/4 ″ NPT3/4 ″ M14 × M18 × M22 × M33 × ZG1 ″ Rc1 ″ PT1 ″ G1 ″ Z1 ″ NPT1 ″ M16 × M20 × M24 × M36 × ZG1 1/ 4″ Rc1 1/ 4″ PT1 1/ 4″ G1 1/ 8″ Z1 1/ 4″ NPT1 1/ 4″ M18 × M22 × M27 × M42 × ZG1 1/ 2″ Rc1 1/ 2″ PT1 1/ 2″ G1 1/ 4″ Z1 1/ 2″ NPT1 1/ 2″ M20 × M24 × M30 × M48 × ZG2 ″ Rc2 ″ PT2
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