美制螺纹标准对照表.pdf

最小最大最小最大最小最大8320.15710.16310.13990.14280.1248(0.16432)3.99034.14273.55353.62713.169910240.18180.1890.15860.16190.1379(0.19024)4.61774.80064.02844.11233.502712240.20780.2150.18450.18790.1639(0.21624)5.27815.4614.68634.77274.16311/4200.24080.24890.21270.21640.1876(0.25020)6.11636.32215.40265.49664.7655/16180.30260.31130.27120.27520.2431(0.317518)7.6867.9076.88856.99016.17473/8160.36430.37370.32870.33310.297(0.37516)9.25329.4928.3498.46077.54387/16140.42580.43610.3850.38970.3485(0.437514)10.815311.07699.7799.89848.85191/2130.48760.49850.44350.44850.4041(0.5013)12.38512.661911.264911.391910.26419/16/20120.54950.56090.50160.50680.4587(0.562512)13.957314.246912.740612.872711.6515/8110.61130.62340.55890.56440.5119(0.62511)15.52715.834414.196114.335813.00233/4100.73530.74820.67730.68320.6255(0.75010)18.676619.004317.203417.353315.88777/890.85920.87310.79460.80090.7368(0.8759)21.823722.176720.182820.342918.7147180.9830.9980.910.91680.8446(1.0008)24.968225.349223.11423.286721.4528美制外螺纹（2A）常用规格极限尺寸表（粗牙）公称尺寸和每英寸牙数螺纹系列代号大径极限中径极限小径max螺胚直径4.14.724.755.455.486.946.988.48.449.839.8711.3411.3812.812.8414.2714.3217.2817.3320.2720.3223.2223.271.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。2.标记示例：1024UNC2A(或0.19024UNC2A)、3/816UNC2A(或0.37516UNC2A)UNC3.583.614.07（注：表中上行斜体数值单位为英寸，下行为毫米）美制螺纹标准对照表美制螺纹标准对照表最小最大最小最大最小最大8360.15770.16320.14240.14520.1291(0.16436)4.00564.14533.6173.68813.279110320.18310.18910.16580.16880.1508(0.19032)4.65074.80314.21134.28753.830312280.20850.2150.18860.19180.1712(0.21628)5.29595.4614.79044.87174.34851/4280.24250.2490.22250.22580.2052(0.25028)6.15956.32465.65155.73535.21215/16240.30420.31140.28060.28430.2603(0.317524)7.72677.90967.12727.22126.61163/8240.36670.37390.3430.34680.3228(0.37524)9.31429.49718.71228.80878.19917/16200.42810.43620.39950.40370.3749(0.437520)10.873711.079510.147310.2549.52251/2200.49060.49870.46190.46620.4374(0.5020)12.461212.66711.732311.841511.119/16/20180.55240.56110.52050.5250.4929(0.562518)14.03114.251913.220713.33512.51975/8180.61490.62360.58280.58750.5554(0.62518)15.618515.839414.803114.922514.10723/4160.73910.74850.70290.70790.6718(0.75016)18.773119.011917.853717.980717.06377/8140.86310.87340.82160.8270.7858(0.87514)21.922722.184420.868621.005819.95931120.98680.99820.93820.94410.896(1.00012)25.064725.354323.830323.980122.7584美制外螺纹（2A）常用规格极限尺寸表（细牙）公称尺寸和每英寸牙数螺纹系列代号大径极限中径极限小径max螺胚直径4.274.824.855.695.717.177.28.758.7810.1910.2311.7811.8213.2713.3114.8514.8917.9117.9520.9320.9723.923.951.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。2.标记示例：1032UNF2A(或0.19032UNF2A)、3/824UNF2A(或0.37524UNF2A)UNF3.653.674.24最小最大最小最大最小最大8320.130.1390.14370.14750.164(0.16432)3.3023.53063.653.74654.165610240.1450.1560.16290.16720.19(0.19024)3.6833.96244.13774.24694.82612240.1710.1810.18890.19330.216(0.21624)4.34344.59744.79814.90985.48641/4200.1960.2070.21750.22240.25(0.25020)4.97845.25785.52455.6496.355/16180.2520.2650.27640.28170.3125(0.317518)6.40086.7317.02067.15527.93753/8160.3070.3210.33440.34010.375(0.37516)7.79788.15348.49388.63859.5257/16140.360.3760.39110.39720.4375(0.437514)9.1449.55049.933910.088911.11251/2130.4170.4340.450.45650.5(0.5013)10.591811.023611.4311.595112.79/16/20120.4720.490.50840.51520.5625(0.562512)11.988812.44612.913413.086114.28755/8110.5270.5460.5660.57320.625(0.62511)13.385813.868414.376414.559315.8753/4100.6420.6630.6850.69270.75(0.75010)16.306816.840217.39917.594619.057/890.7550.7780.80280.8110.875(0.8759)19.17719.761220.391120.599422.225180.8650.890.91880.92761(1.0008)21.97122.60623.337523.56125.4美制内螺纹（2B）常用规格极限尺寸表（粗牙）公称尺寸和每英寸牙数螺纹系列代号小径极限中径极限大径min底孔直径3.94.44.555.055.26.456.67.8589.29.410.6510.912.0512.313.4513.716.416.719.319.622.122.41.底孔直径指攻丝前钻孔直径，铸铁、黄铜等较软料取小值，钢、青铜等较硬料取大值。2.标记示例：1024UNC2B(或0.19024UNC2B)、3/816UNC2B(或0.37516UNC2B)UNC3.43.53.75最小最大最小最大最小最大8360.1340.1420.1460.14960.164(0.16436)3.40363.60683.70843.79984.165610320.1560.1640.16970.17360.19(0.19032)3.96244.16564.31044.40944.82612280.1770.1860.19280.1970.216(0.21628)4.49584.72444.89715.00385.48641/4280.2110.220.22680.23110.25(0.25028)5.35945.5885.76075.86996.355/16240.2670.2770.28540.29020.3125(0.317524)6.78187.03587.24927.37117.93753/8240.330.340.34790.35280.375(0.37524)8.3828.6368.83678.96119.5257/16200.3830.3950.4050.41040.4375(0.437520)9.728210.03310.28710.424211.11251/2200.4460.4570.46750.47310.5(0.5020)11.328411.607811.874512.016712.79/16/20180.5020.5150.52640.53230.5625(0.562518)12.750813.08113.370613.520414.28755/8180.5650.5780.58890.59490.625(0.62518)14.35114.681214.958115.110515.8753/4160.6820.6960.70940.71590.75(0.75016)17.322817.678418.018818.183919.057/8140.7980.8140.82860.83560.875(0.87514)20.269220.675621.046421.224222.2251120.910.9280.94590.95351(1.00012)23.11423.571224.025924.218925.45.45.716.85美制内螺纹（2B）常用规格极限尺寸表（细牙）公称尺寸和每英寸牙数螺纹系列代号小径极限中径极限大径min底孔直径10.2311.411.82UNF3.453.6744.274.554.852.标记示例：1032UNF2B(或0.19032UNF2B)、3/824UNF2B(或0.37524UNF2B)12.8513.3114.4514.8917.417.9520.3520.9723.923.951.底孔直径指攻丝前钻孔直径，铸铁、黄铜等较软料取小值，钢、青铜等较硬料取大值。7.28.458.789.85B:美规螺丝.a.一般以番号标示,如#256,#440,#632,#832,#1024etcb.或以英制外径表示,如0.08656,0.11240,0.13832,0.16432,0.19024etcEx:6328PPB:FinishCode:外观处理规格HeadCode:头部外型DriveCode:头部剖沟,特征型号LengthCode:螺丝长度ThreadCode:螺丝型号B1:ThreadCode:螺丝型号一般常用规格如下:a.#256(0.08656):2番56牙b#440(0.11240):4番40牙c.#632(0.13832):6番32牙d.#832(0.16432):8番32牙e.#1024(0.19024):10番24牙*牙为每吋之牙数.*B2:LengthCode:螺丝长度美规螺丝长度须经换算,才是公制mm尺寸.换算公式:(LengthCode/32)x25.40=公制长度mmB3,B4,B5:标示方式与公制相同.