公制螺纹用公制单位 ， 美英制螺纹用英制单位 。
管螺纹主要用来进行管道的连接 ， 其内外螺纹的配合紧密 ， 有直管与锥管两种 。
公称直径是指所连接的管道 直径 ， 显然螺纹大径比公称直径大 。
1/4 ， 1/2 ， 1/8是英制螺纹的公称直径 ， 单位是英寸 。
英制螺纹标准规格表大径螺距中径小径寸牙型代号每英寸牙数外螺纹牙型高底孔直径mmmmmmWwd=Dptpid2=D2d3H1mm1/16BSW1.5870.423601.3151.0500. 。

37、2701.153/32BSW2.3810.529482.0411.7030.3381.901/8BSW3.1750.635402.7682.3620.4062.505/32BSW3.9690.793323.4592.9520.5073.203/16BSW4.7621.058244.0843.4070.6773.70刀32BSW5.5561.058244.8784.2010.6774.501/4BSW6.3501.270205.5374.7240.8135.105/16BSW7.9381.411187.0346.1310.9046.503/8BSW9.5251.588168.5097.4921. 。

38、0177.907/16BSW11.1131.814149.9518.7891.1629.201/2BSW12.7002.1171211.3459.9901.35510.405/8BSW15.8762.3091114.39712.9181.47913.403/4BSW19.0512.5401017.42415.7981.62716.25刀8BSW22.2262.822920.41918.6111.80719.251BSW25.4003.175823.36821.3352.03322.001 1/8BSW28.5763.629726.25323.9292.32424.501 1/4BSW31.75 。

39、13.629729.42827.1042.32427.251 3/8BSW34.9264.233632.21529.5052.71130.251 1/2BSW38.1004.233635.39132.6802.71133.501 5/8BSW41.2775.080538.02434.7713.25335.501 3/4BSW44.4525.080541.19937.9463.25338.501 7/8BSW47.6275.6454 1/244.01240.3983.61441.252BSW50.8025.6454 1/247.18743.5733.61444.502 1/4BSW57.1526 。

40、.350453.08649.0204.06650.002 1/2BSW63.5026.350459.43655.3704.06656.002 3/4BSW69.8537.2573 1/265.20560.5584.64761.503BSW76.2037.2573 1/271.55666.9094.64768.003 1/4BSW82.5537.8163 1/477.54872.5445.00573.753 1/2BSW88.9037.8163 1/483.89978.8945.00580.003 3/4BSW95.2548.467389.83284.4105.42285.504BSW101.6 。

41、048.467396.18290.7605.42292.004 1/4BSW107.9548.8352刀8102.29796.6395.65798.004 1/2BSW114.3048.8352刀8108.647102.9905.657104.204 3/4BSW120.6659.2372 3/4114.740108.6255.915110.005BSW127.0059.2372 3/4121.090115.1765.915116.505 1/4BSW133.3559.6772 5/8127.159120.9636.196122.505 1/2BSW139.7059.6772 5/8133.5 。

42、09127.3136.196128.505 3/4BSW146.05510.1602 1/2139.549133.0436.506134.506BSW152.40610.1602 1/2145.900139.3946.506141.00英制普通螺纹-细牙-BSF英制普通螺纹(惠氏螺纹)-细牙(BSW)大径螺距每英寸牙数中径小径牙型高底孔直径名义尺寸牙型代号mmmmmm外螺纹BSFd=Dptpid2=D2d3H1mm3/16BSF4.7630.794324.2553.7470.5084.00刀32BSF5.5560.907284.9754.3940.5814.601/4BSF6.3500.977 。

43、265.7255.1000.6255.309/32BSF7.1420.977266.5185.8930.6256.105/16BSF7.9381.156227.1996.4590.7396.803/8BSF9.5251.27208.7127.8990.8138.30刀16BSF11.1131.4111810.2099.3040.9049.701/2BSF12.7001.5881611.68410.6681.01711.109/16BSF14.2881.5881613.27212.2561.01712.705/8BSF15.8751.8141414.71213.5491.16214.0011/1 。

44、6BSF17.4631.8141416.30015.1371.16215.503/4BSF19.0502.1171217.69316.3361.35516.7513/16BSF20.6382.1171219.28117.9241.35518.257/8BSF22.2252.3091120.74719.2691.47919.751BSF25.4002.541023.77422.1481.62722.751 1/8BSF28.5752.822926.76924.9631.80726.501 1/4BSF31.7502.822929.94428.1381.80728.751 3/8BSF34.925 。

45、3.175832.89330.8612.03331.501 1/2BSF38.1003.175836.06834.0362.03334.501 5/8BSF41.2753.175839.24337.2112.03338.001 3/4BSF44.4503.629742.12639.8022.32440.502BSF50.8003.629748.47646.1522.32447.002 1/4BSF57.1504.234654.44051.7302.71153.002 1/2BSF63.5004.234660.79058.0802.71159.002 3/4BSF69.8504.234667.1 。

46、4064.4302.711-3BSF76.2005.08572.94669.6923.253-3 1/4BSF82.5505.08579.29676.0423.253-3 1/2BSF88.9005.6454 1/285.28581.6703.614-3 3/4BSF95.2505.6454 1/291.63588.0203.614-4BSF101.6005.6454 1/297.98594.3703.614-4 1/4BSF107.9506.354103.88699.8224.066-螺纹标记的标注当螺纹精度要求较高时 ， 除标注螺纹代号外 ， 还应标注螺纹公差带代号和螺纹旋合长度 。
螺纹标记的标注格式为：螺纹代号一螺纹公差带代号（中径、顶径）一旋合长度有关标注内容的说明：1）公差带代号由数字加字母表示（内螺纹用大写字母 ， 外螺纹用小写字母 ） ， 如7H、6g等 ， 应特别指出 ， 7H ，6g等代表螺纹公差 ， 而 H7, g6代表圆柱体公差代号 。
2）旋合长度规定为短（用S表示）、中（用N表示）、长（用L表示）三种 。
一般情况下 ， 不标注螺纹旋合长度 ， 其螺纹公差带按中等旋合长度（N）确定 。
必要时 ， 可加注旋合长度代号S或L,如“ M20-5g6g-L” 。
特殊需要时 ， 可注明旋合长度的数值 ， 如“M20-5g6g 30” 。
相关链接美英制螺纹用英制单位螺纹标准 ， 螺纹标准手册螺纹的结构英制螺纹尺寸 ， 英制螺纹尺寸表英制 。

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标题：螺纹|螺纹基本尺寸对照表17272( 四 )