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1、1美制外螺紋（2A）常用規(guī)格極限尺寸表（粗牙）大徑極限中徑極限螺胚直徑公稱尺寸和每英寸牙數(shù)螺紋系列代號最小最大最小最大小徑max最小最大8320.15710.16310.13990.14280.1248(0.16432)3.99034.14273.55353.62713.16993.583.6110240.18180.18900.15860.16190.1379(0.19024)4.61774.80064.02844.11233.502
2、74.074.1012240.20780.21500.18450.18790.1639(0.21624)5.27815.46104.68634.77274.16314.724.7514200.24080.24890.21270.21640.1876(0.25020)6.11636.32215.40265.49664.76505.455.48516180.30260.31130.27120.27520.2431(0.317518)7.68
3、607.90706.88856.99016.17476.946.9838160.36430.37370.32870.33310.2970(0.37516)9.25329.49208.34908.46077.54388.408.44716140.42580.43610.38500.38970.3485(0.437514)10.815311.07699.77909.89848.85199.839.8712130.48760.49850.44
4、350.44850.4041(0.5013)12.385012.661911.264911.391910.264111.3411.38916120.54950.56090.50160.50680.4587(0.562512)13.957314.246912.740612.872711.651012.8012.8458110.61130.62340.55890.56440.5119(0.62511)15.527015.834414.196
5、114.335813.002314.2714.3234100.73530.74820.67730.68320.6255(0.75010)18.676619.004317.203417.353315.887717.2817.337890.85920.87310.79460.80090.7368(0.8759)21.823722.176720.182820.342918.714720.2720.321“80.98300.99800.9100
6、0.91680.8446(1.0008)UNC24.968225.349223.114023.286721.452823.2223.271.螺胚直徑指滾絲前的尺寸，數(shù)值為依經(jīng)驗公式計算而得，在實踐中需驗證。2.標記示例：1024UNC2A(或0.19024UNC2A)、3816UNC2A(或0.37516UNC2A)（注：表中上行斜體數(shù)值單位為英寸，下行為毫米）3美制內(nèi)螺紋（2B）常用規(guī)格極限尺寸表（粗牙）小徑極限中徑極限底孔直徑公稱尺
7、寸和每英寸牙數(shù)螺紋系列代號最小最大最小最大大徑min最小最大8320.13000.13900.14370.14750.1640(0.16432)3.30203.53063.65003.74654.16563.403.5010240.14500.15600.16290.16720.1900(0.19024)3.68303.96244.13774.24694.82603.753.9012240.17100.18100.18890.19330
8、.2160(0.21624)4.34344.59744.79814.90985.48644.404.5514200.19600.20700.21750.22240.2500(0.25020)4.97845.25785.52455.64906.35005.055.20516180.25200.26500.27640.28170.3125(0.317518)6.40086.73107.02067.15527.93756.456.603816
9、0.30700.32100.33440.34010.3750(0.37516)7.79788.15348.49388.63859.52507.858.00716140.36000.37600.39110.39720.4375(0.437514)9.14409.55049.933910.088911.11259.209.4012130.41700.43400.45000.45650.5000(0.5013)10.591811.023611
10、.430011.595112.700010.6510.90916120.47200.49000.50840.51520.5625(0.562512)11.988812.446012.913413.086114.287512.0512.3058110.52700.54600.56600.57320.6250(0.62511)13.385813.868414.376414.559315.875013.4513.7034100.64200.6
11、6300.68500.69270.7500(0.75010)16.306816.840217.399017.594619.050016.4016.707890.75500.77800.80280.81100.8750(0.8759)19.177019.761220.391120.599422.225019.3019.601“80.86500.89000.91880.92761.0000(1.0008)UNC21.971022.60602
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