英制锥度管用螺纹JIS B0203JIS B0203管用螺纹规格1/16 ‐281/8 ‐281/4 ‐193/8 ‐191/2 ‐143/4 ‐141 ‐111 1/4 ‐111 1/2 ‐112 ‐112 1/2 ‐113 ‐113 1/2 ‐114 ‐115 ‐116 ‐11锥度内螺纹Rc(PT)计算数值底孔直径6.236.28.2358.210.94110.914.42814.417.951823.3492319.4232937.943843.8334455.4125570.7017183.2018395.796107.834108133.11133158.51159平行管内螺纹Rp(PS)计算数值底孔直径6.496.58.4958.511.34111.414.84614.918.418.523.9752430.1113038.7723944.56556.4765672.0097284.7098597.15597109.855110135.255135160.655161英制平行管用螺纹（G、PF）管用螺纹规格G 1/16 ‐28G(PF) 1/8 ‐28G(PF) 1/4 ‐19G(PF) 3/8 ‐19G(PF) 1/2 ‐14G(PF) 5/8 ‐14G(PF) 3/4 ‐14G(PF) 7/8 ‐14G(PF) 1 ‐11G(PF) 1 1/8 ‐11G(PF) 1 1/4 ‐11内螺纹最小径（参考）底孔钻头直径最大尺寸最小尺寸6.76.8436.5618.78.8488.56611.711.11.44515.215.39514.951919.17218.6312121.1320.524.524.65824.11728.228.41827.87730.630.93130.29135.239.235.57939.59234.93938.952G(PF) 1 1/2 ‐11G(PF) 1 3/4 ‐11G(PF) 2 ‐11G(PF) 2 1/4 ‐11G(PF) 2 1/2 ‐11G(PF) 2 3/4 ‐11G(PF) 3 ‐11G(PF) 3 1/2 ‐11G(PF) 4 ‐11G(PF) 4 1/2 ‐11G(PF) 5 ‐11G(PF) 5 1/2 ‐11G(PF) 6 ‐11455157637278.58597─────45.48551.42857.29663.39272.86679.21685.56698.012110.712123.412136.112148.812161.51244.84550.78856.65662.75272.22678.57684.92697.372110.072122.772135.472148.172160.872美制标准管用螺纹（NPT、NPS）锥度螺纹（NPT）底孔钻头直径管用螺 纹规格1/16 ‐271/8 ‐271/4 ‐183/8 ‐181/2 ‐143/4 ‐141 ‐11 1/21 1/4 ‐11 1/21 1/2 ‐11 1/22 ‐11 1/22 1/2 ‐8使用 铰刀mm5.948.3310.7214.2717.4822.6328.5837.3143.2655.1765.48inch0.2340.3280.4220.5620.6880.11.1251.4691.7032.1722.578不使用 铰刀mminch6.150.2468.430.33211.130.43814.270.56217.860.70323.010.90628.981.14137.691.48443.661.71955.582.18866.272.609JIS B 2301锥度管内螺纹计算数值底孔直径－－8.1918.210.94510.914.38814.417.9431823.3052329.3532937.3843.724355.4065570.7887083.38395.74795108.322108133.597133158.81158S）
平行螺纹(NPS）mminch6.350.258.740.34411.130.43814.680.57818.260.71923.420.92229.361.15638.11.4.451.7556.362.21967.462.656
