英制普通螺纹(惠氏螺纹)-小螺纹系列(BA)名义尺寸大径螺距每英寸牙数中径小径牙型高底孔直径BA牙型代号mmmmtpimm外螺纹H1mmd=Dpd2=D2d3No.14BA10.23110.40.860.720.140.75No.13BA1.20.25101.61.050.90.150.95No.12BA1.30.2890.711.130.960.171No.11BA1.50.3181.931.3151.130.1851.2No.10BA1.70.3572.571.491.280.211.35No.9BA1.90.3965.121.6651.430.2351.5No.8BA2.20.4359.071.941.680.261.8No.7BA2.50.4852.922.211.920.292No.6BA2.80.5347.922.482.160.322.3No.5BA3.20.5943.052.8452.490.3552.6No.4BA3.60.6638.483.2052.810.3952.95No.3BA4.10.7334.793.663.220.443.4No.2BA4.70.8131.354.2153.730.4853.9No.1BA5.30.928.224.764.220.544.4No.0BA6125.45.44.80.6555°圆锥管螺纹型式和尺寸基本尺寸大径螺距每英寸牙数中径小径牙型高度底孔尺寸螺纹代号英寸mmmmtpimm外螺纹H1mmd=Dpd2=D2d3R1/161/16＂7.7230.907287.1426.5610.5816.4R1/81/8＂9.7280.907289.1478.5660.5818.4R1/41/4＂13.1571.3371912.30111.4450.85611.2R3/83/8＂16.6621.3371915.80614.950.85614.75R1/21/2＂20.9551.8141419.79318.6311.16218.25R3/43/4＂26.4411.8141425.27924.1171.16223.75R11＂33.2492.3091131.7730.2911.47930R11/411/4＂41.912.3091140.43138.9521.47938.5R11/211/2＂47.8032.3091146.32444.8451.47944.5R22＂59.6142.3091158.13556.6561.47956R21/221/2＂75.1842.3091173.70572.2261.47971R33＂87.8842.3091186.40584.9261.47985.5R44＂113.032.30911111.551110.0721.479110.5R55＂138.432.30911136.951135.4721.479136R66＂163.832.30911162.351160.8721.479161.5螺距=25.4除以每英寸牙数(例：每英寸28牙，即P=25.4/28=0.907),牙高=0.907×0.64=0.581英制惠氏螺纹的型式尺寸英制普通螺纹(惠氏螺纹)-粗牙(BSW)名义尺寸大径螺距每英寸牙数中径小径牙型高底孔直径Ww牙型代号mmmmtpimm外螺纹H1mmd=Dpd2=D2d31/16＂BSW1.5870.423601.3151.050.271.153/32＂BSW2.3810.529482.0411.7030.3381.91/8＂BSW3.1750.635402.7682.3620.4062.55/32＂BSW3.9690.793323.4592.9520.5073.23/16＂BSW4.7621.058244.0843.4070.6773.77/32＂BSW5.5561.058244.8784.2010.6774.51/4＂BSW6.351.27205.5374.7240.8135.15/16＂BSW7.9381.411187.0346.1310.9046.53/8＂BSW9.5251.588168.5097.4921.0177.97/16＂BSW11.1131.814149.9518.7891.1629.21/2＂BSW12.72.1171211.3459.991.35510.45/8＂BSW15.8762.3091114.39712.9181.47913.43/4＂BSW19.0512.541017.42415.7981.62716.257/8＂BSW22.2262.822920.41918.6111.80719.25