pt1/8螺纹底孔对照表（常用螺纹底孔对照表）

pt1/8螺纹底孔对照表由本站整理编辑，为你带来全面的常用螺纹底孔对照表内容阅读。一起跟小编来看看吧！

pt1/8螺纹底孔对照表

PT1/8螺丝，底孔尺寸是D8.5，深度20MMPT1/4螺丝，底孔尺寸是D11.5，深度30MM。

若底孔直径与内螺纹直径一致材料扩张时就会卡住丝锥，这时丝锥容易折断；若过大，就会使攻出的螺纹牙型高度不够而形成废品。

螺纹配合根据不同的国际标准，需要有相应的配合公差，可以查钳工手册。底孔如果是沉孔还需考虑攻丝排削影响！

详细说明

丝锥在攻螺纹的过程中，切削刃主要是切削金属，但还有挤压金属的作用，因而造成金属凸起并向牙尖流动的现象，所以攻螺纹前，钻削的孔径（即底孔）应大于螺纹内径。

计时液流法是用能使镀层溶解的溶液流注在镀层的局部表面上，根据局部镀层溶解完毕所需要的时间，来计算镀层的厚度。还有镀层点滴法、阳极溶解库仑法等。

产生金属镀层的办法和品种相当多，其中最常见的是电镀法，其次是熔融金属浸镀法(热浸镀)及化学外表处置。用有机高分子资料如油漆，及无机资料如陶瓷，在金属设备或零件外表上构成维护层，该维护层能将基体金属与环境介质完整隔离，避免基体金属因接触腐蚀在不锈钢标准件介质而形成腐蚀。

常用螺纹底孔对照表

最小最大最小最大_8-320.15710.16310.1399

0.14280.1248(0.164-32)3.99034.14273.55353.62713.1699_10-240.18180.1890.15860.16190.1379(0.190-24)4.61774.80064.02844.11233.5027_12-240.20780.2150.18450.18790.1639(0.216-24)5.27815.4614.68634.77274.1631_1/4-200.24080.24890.21270.21640.1876(0.250-20)6.11636.32215.40265.49664.765_5/16-180.30260.31130.27120.27520.2431(0.3175-18)7.6867.9076.88856.99016.1747_3/8-160.36430.37370.32870.33310.297(0.375-16)9.25329.4928.3498.46077.5438_7/16-140.42580.43610.3850.38970.3485(0.4375-14)10.815311.07699.7799.89848.8519_1/2-130.48760.49850.44350.44850.4041(0.50-13)12.38512.661911.264911.391910.26419/16-120.54950.56090.50160.50680.4587(0.5625-12)13.957314.246912.740612.872711.651_5/8-110.61130.62340.55890.56440.5119(0.625-11)15.52715.834414.196114.335813.0023_3/4-100.73530.74820.67730.68320.6255(0.750-10)18.676619.004317.203417.353315.8877_7/8-90.85920.87310.79460.80090.7368(0.875-9)21.823722.176720.182820.342918.71471"-80.9830.9980.910.91680.8446(1.000-8)24.968225.349223.11423.286721.4528最小最大最小最大_8-360.15770.16320.14240.14520.1291(0.164-36)4.00564.14533.6173.68813.2791_10-320.18310.18910.16580.16880.1508(0.190-32)4.65074.80314.21134.28753.8303_12-280.20850.2150.18860.19180.1712美制外螺纹（2A）常用规格极限尺寸表（粗牙）_

螺纹孔规格表

了解螺纹规格对于购买螺纹有很大的帮助，但是螺纹规格很多很复杂，很少有人记得比较全，下面小编为大家列出一些螺纹规格作为大家的参考。

一、美制螺纹规格

美制细螺纹

美制粗螺纹

规格 (UNF)标准径2级牙钻孔径

规格 (UNC)标准径2级牙钻孔径

最大最小

最大最小NO.0-80(1.524)1.251.3051.162NO.1-64(1.854)1.551.5821.425NO.1-72(1.354)1.551.6121.474NO.2-56(2.184)1.801.8711.695NO.2-64(2.184)1.851.9121.736NO.3-48(2.515)2.102.1461.941NO.3-56(2.515)2.102.1972.025NO.4-40(2.845)2.302.3852.157NO.4-48(2.845)2.402.4582.271NO.5-40(3.175)2.602.6972.487NO.5-44(3.175)2.702.7402.551NO.6-32(3.505)2.802.8952.642NO.6-40(3.505)2.903.0222.820NO.8-32(4.166)3.403.5303.302NO.8-36(4.166)3.503.6063.404NO.10-24(4.826)3.903.9623.683NO.10-32(4.826)4.104.1653.963NO.12-24(5.346)4.504.5974.344NO.12-28(5.346)4.604.7244.4961/4-285.105.2574.9791/4-285.505.5885.3605/16-186.606.7316.4015/16-246.907.0356.7823/8-168.008.1537.7983/8-248.508.6368.3827/16-149.409.5509.1447/16-209.9010.0339.7291/2-1310.8011.02310.5921/2-2011.5011.60711.3299/16-1212.2012.44611.9899/16-1812.9013.08112.7515/8-1113.6012.86813.3865/8-1814.5014.58114.3513/4-1016.5018.84016.3073/4-1617.5017.67817.3237/8-919.5019.76119.1777/8-1420.5020.67520.2701 -822.2022.60621.9711 -1223.2023.57123.1141-1/8-725.0025.34924.6381-1/8-1226.5026.74626.2691-1/4-728.2028.52427.8131-1/4-1229.5029.92129.4641-3/8-630.8031.11530.3531-3/8-1232.8033.09632.6391-1/2-634.0034.29038.5281-1/2-1236.0036.27135.8141-3/4-539.5039.32738.964

2 -4-1/245.2045.59344.679

二、美制手特细螺纹规格表和美制锥度管螺纹规格

三、英制螺纹规格表

四、公制螺纹规格表

以上就是为大家列出的不同标准的螺纹规格表，资料来源于网络，仅供大家参考。