螺纹孔底孔以及壁厚评估表

切削丝锥内螺纹规格G牙距适合加工方式螺纹底孔径范围钻孔直径￠钻尖深度T1最小底孔深度T2（基础上+螺纹深度）钻孔直径￠挤压丝锥铣牙加工钻尖深度T1最小底孔深度T2（基础上+螺纹深度）最小底孔深度T2（基础上+螺纹深度）￠1/16-280.91攻牙6.561~6.8436.71.942.727.152.0710.77--1/8-280.91攻牙8.566~8.8488.72.512.729.152.6513.35--1/4-191.34攻牙/铣牙11.445~11.8911.73.384.0112.373.5717.271.33/8-191.34铣牙14.95~15.39515.24.39--------1.3T2T31/2-141.81铣牙18.631~19.395195.49--------1.85/8-141.81铣牙20.587~21.128216.07--------1.83/4-141.81铣牙24.117~24.65824.57.08--------1.8T17/8-141.81铣牙27.877~28.41828.28.15--------1.81-112.31铣牙30.291~30.93130.68.84--------2.31 1/8-112.31铣牙34.939~35.59235.210.17--------2.31 1/4-112.31铣牙38.952~39.59239.211.33--------2.31 1/2-112.31铣牙44.845~45.4854513.01--------2.31 3/4-112.31铣牙50.788~51.4285114.74--------2.32-112.31铣牙56.656~57.2965716.47--------2.3