1、螺纹孔底孔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)M50.8 4.2 M81 7.0 M121.5 10.5 M202 18.0 ZG1/8 Rc1/8 PT1/8 8.4 G1/8 8.6 Z1/8 NPT1/8 8.4M61 5.0 M101 9.0 M141.5 12.5 M222 20.0 ZG1/4 Rc1/4 P
2、T1/4 11.0 G1/4 11.7 Z1/4 NPT1/4 11.1M81.25 6.8 M121 11.0 M161.5 14.5 M242 22.0 ZG3/8 Rc3/8 PT3/8 14.5 G3/8 15.2 Z3/8 NPT3/8 14.6M101.5 8.5 M141 13.0 M181.5 16.5 M272 25.0 ZG1/2 Rc1/2 PT1/2 18.0 G1/2 18.8 Z1/2 NPT1/2 18.1M121.75 10.2 M161 15.0 M201.5 18.5 M302 28.0 ZG3/4 Rc3/4 PT3/4 23.5 G3/4 24.3 Z3
3、/4 NPT3/4 23.5M142 12.0 M181 17.0 M221.5 20.5 M332 31.0 ZG1 Rc1 PT1 29.5 G1 30.5 Z1 NPT1 29.4M162 14.0 M201 19.0 M241.5 22.5 M362 34.0 ZG1 1/4 Rc1 1/4 PT1 1/4 38.0 G1 1/8 35.2 Z1 1/4 NPT1 1/4 38.2M182.5 15.5 M221 21.0 M271.5 25.5 M422 40.0 ZG1 1/2 Rc1 1/2 PT1 1/2 44.0 G1 1/4 39.2 Z1 1/2 NPT1 1/2 44.
4、3M202.5 17.5 M241 23.0 M301.5 28.5 M482 46.0 ZG2 Rc2 PT2 56.0 G1 1/2 45.1 Z2 NPT2 56.3M243 21.0 M271 26.0 M331.5 31.5 M522 50.0 ZG2 1/2 Rc2 1/2 PT2 1/2 72.0 G1 3/4 51M273 24.0 M301 29.0 M361.5 34.5 ZG3 Rc3 PT3 84.0 G2 56.9M303.5 26.5 M421.5 40.5 M303 27.0 G1 1/4 62.95M333.5 29.5 M481.5 46.5 M333 30.0 G2 1/2 72.45M364 32.0 M363 33.0 G2 3/4 78.8M424.5 37.5 M423 39.0 G3 85.2M485 43.0 M483 45.0M525 47.0 M523 49.0M565.5 50.5M646 58.0