普通粗牙螺孔攻丝前钻孔尺寸公称尺寸M5×0.8M6×1M8×1.25M10×1.5M12×1.75M14×2M16×2M18×2.5M20×2.5M24×3M27×3M30×3.5M33×3.5M36×4M42×4.5M48×5M52×5M56×5.5M64×6底孔d4.25.06.88.510.212.014.015.517.521.024.026.529.532.037.543.047.050.558.0公称尺寸M8×1M10×1M12×1M14×1M16×1M18×1M20×1M22×1M24×1M27×1M30×1普通细牙螺孔攻丝前钻孔尺寸底孔d公称尺寸底孔d7.09.011.013.015.017.019.021.023.026.029.0M12×1.5M14×1.5M16×1.5M18×1.5M20×1.5M22×1.5M24×1.5M27×1.5M30×1.5M33×1.5M36×1.5M42×1.5M48×1.510.512.514.516.518.520.522.525.528.531.534.540.546.5圆锥管螺孔攻丝前钻孔尺寸公称尺寸日本底孔d8.411.014.518.023.529.538.044.056.072.084.0圆柱管螺孔攻丝前钻孔尺寸公称尺寸G1/8″G1/4″G3/8″G1/2″G3/4″G1″G1 1/8″G1 1/4″G1 1/2″G1 3/4″G2″G1 1/4″G2 1/2″G2 3/4″G3″直管螺纹55度底孔d8.611.715.218.824.330.535.239.245.15156.962.9572.4578.885.2布锥管螺孔攻丝前钻孔尺寸公称尺寸底孔d中国中国(新)(旧)Z1/8″NPT1/8″8.4Z1/4″NPT1/4″11.1Z3/8″NPT3/8″14.6Z1/2″NPT1/2″18.1Z3/4″NPT3/4″23.5Z1″NPT1″29.4NPT1 1/4Z1 1/4″″38.2NPT1 1/2Z1 1/2″″44.3Z2″NPT2″56.3锥管螺纹60度公称尺底孔d寸中国(旧)中国(新)M20×2M22×2M24×2M27×2M30×2M33×2M36×2M42×2M48×2M52×2M30×3M33×3M36×3M42×3M48×3M52×318.020.022.025.028.031.034.040.046.050.027.030.033.039.045.049.0ZG1/8″ZG1/4″ZG3/8″ZG1/2″ZG3/4″ZG1″Rc1/8″Rc1/4″Rc3/8″Rc1/2″Rc3/4″Rc1″PT1/8″PT1/4″PT3/8″PT1/2″PT3/4″PT1″PT1 1/4ZG1 1/4″Rc1 1/4″″ZG1 1/2″Rc1 1/2″PT1 1/2″ZG2″Rc2″PT2″ZG2 1/2″Rc2 1/2″PT2 1/2″ZG3″Rc3″PT3″锥管螺纹55度
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