普通公制螺纹搓滚丝毛坯尺寸及公差的确定

1、普通公制螺纹搓（滚）丝毛坯尺寸及公差的确定普通螺纹计算式：dOmi n=d2mi n+0.3Td2 d0max=d2mi n+0.7Td2 式中：dOmin-最小毛坯直径 dOmax最大毛坯直径 d2mi n-最小外螺纹中径Td2外螺纹中径公差D2=D 0.6495X PD1=D 1.083X P表一：普通螺纹的基本尺寸（GB/T196-2003）mm公称直径（大径）D、d螺距P中径D2、d2小径D1、d1公称直径（大径）D、d螺距P中径D2、d2小径D1、d110.250.8380.729221.521.02620.3761.20.251.0380.9292.520.37619.2941.4

2、0.31.2051.07524222.70121.8351.60.351.3731.221322.05120.75220.41.7401.56727225.70124.8352.50.452.2082.013325.05123.75230.52.6752.45930228.70127.8353.50.63.1102.8503.527.72726.21140.73.5453.24233231.70130.8354.50.754.0133.6883.530.72729.21150.84.4804.13436334.05132.752615.3504.917433. 40231.670817.356

3、.91739337.05135.7521.257.1886.647436. 40234.6701019.3508.91742340.05138.7521.259.1888.6474.539.07737.1291.59.0268.37645343.05141.752121.2511.18810.6474.542.07740.1291.511.02610.37648346.05144.7521.7510.86310.106544.75242.587141.513.02612.37652449.40247.670212.70111.835548.75246.587161.515.02614.3765

4、6453.40251.670214.70113.8355.552.42850.046182.516.37615.29460457.40255.670201.519.02618.3765.556.42854.046218.70117.83564461.40259.6702.518.37617.294660.10357.505表二：内外螺纹的基本偏差(GB/T197-2003)卩m螺距P/mm基本偏差螺距P/mm基本偏差内螺纹D、D2外螺纹d、d2内螺纹D、D2外螺纹d、d2GEIHEIe esf esg esh esGEIHEIe esf esg eshes0.2+170一一-1701.25+2

5、80-63-42-2800.25+180一一-1801.5+320-67-45-3200.3+180一一-1801.75+340-71-48-3400.35+190一-34-1902+380-71-52-3800.4+190一-34-1902.5+420-80-58-4200.45+200一-35-2003+480-85-63-4800.5+200-50-36-2003.5+530-90-70-5300.6+210-53-36-2104+600-95-75-6000.7+220-56-38-2204.5+630-100-80-6300.75+220-56-38-2205+710-106-85-

6、7100.8+240-60-38-2405.5+750-112-90-7501+260-60-40-2606+800-118-95-800表三：内螺纹小径公差(GB/T197-2003)卩m螺距P/mm公差等级螺距P/mm公差等级45678456780.23848一一一1.251702122653354250.25455671一一1.51902363003754750.3536785一一1.752122653354255300.356380100一一22363003754756000.47190112一一2.52803554505607100.4580100125一一3315400500630

7、8000.590112140180一3.53554505607109000.6100125160200一43754756007509500.7112140180224一4.542553067085010600.75118150190236一545056071090011200.81251602002503155.547560075095011801150190236300375650063080010001250表四：外螺纹大径公差(GB/T197-2003)卩m螺距P/mm公差等级螺距P/mm公差等级螺距P/mm公差等级4684684680.23656一0.790140一2.52123355

8、300.254267一0.7590140一32363756000.34875一0.8951502363.52654256700.355385一111218028043004757500.46095一1.251322123354.53155008000.4563100一1.515023637553355308500.567106一1.751702654255.53555609000.680125一21802804506375600950表五：内螺纹中径公差 (GB/T197-2003)卩m公称直径D/mm螺距P/mm公差等级公称直径D/mm螺距P/mm公差等级>45678>45678

9、0.991.40.24011.222.41.251121401802242800.2545561.51181501902363000.34860751.751251602002503151.42.80.24221321702122653350.2548602.51401802242803550.3553678522.44511061321702120.45671901.51251602002503150.4560759521401802242803552.85.60.3556719031702122653354250.563801001253.51802242803554500.6719011

10、214041902363003754750.775951181504.52002503154005000.75759511815045901.51321702122653350.88010012516020021501902363003755.611.20.7585100132170318022428035545019511815019023642002503154005001.2510012516020025052122653354255301.51121401802242805.522428035545056011.222.411001251602002506236300375475600

11、表六：外螺纹中径公差 (GB/T197-2003)卩m公称直径D/mm螺距P/mm公差等级公称直径D/mm螺距P/mm公差等级>3456789>34567890.991.40.22430384811.222.41.2567851061321702122650.25263442531.571901121401802242800.3283645561.7575951181501902363001.42.80.2253240502801001251602002503150.25283645562.5851061321702122653350.35324050638022.44516380

12、1001251602002500.434425367851.575951181501902363000.4536455671902851061321702122653352.85.60.35344253678531001251602002503154000.538486075953.51061321702122653354250.64253678510641121401802242803554500.7455671901124.51181501902363003754750.754556719011245901.5801001251602002503150.8486075951181501902901121401802242803555.611.20.755063801001253106132170