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1、圆柱管螺纹基本尺寸圆柱管螺纹的公差尺寸代号每25.4mm内的牙数n螺距P/mm牙高h/mm圆弧半径r/mm基本直径外螺纹内螺纹大径d=D/mm中径d2=D 2/mm小径d=D 1/mm大径公差Td下偏差/mm小径公差TD1上偏差/mm1/16280.9070.5810.1257.7236.561-0.214+0.2821/8280.9070.5810.1259.7288.566-0.214+0.2821/4191.3370.8560.18413.15711.445-0.250+0.4453/8191.3370.8560.18416.66214.950-0.250+0.4451/2141.814

2、1.1620.24920.95518.631-0.284+0.5415/8141.8141.1620.24922.91120.587-0.284+0.5413/4141.8141.1620.24926.44124.117-0.284+0.5417/8141.8141.1620.24930.20127.877-0.284+0.5411112.3091.4790.31733.24930.291-0.360+0.64011/3112.3091.4790.31737.89734.939-0.360+0.64011/4112.3091.4790.31741.91038.952-0.360+0.64011

3、/2112.3091.4790.31747.80344.845-0.360+0.64013/4112.3091.4790.31753.74650.788-0.360+0.6402112.3091.4790.31759.61456.656-0.360+0.64021/4112.3091.4790.31765.71062.752-0.434+0.64021/2112.3091.4790.31775.18472.226-0.434+0.64023/4112.3091.4790.31781.53478.576-0.434+0.6403112.3091.4790.31787.88484.926-0.43

4、4+0.640圆锥管螺纹的基本尺寸尺寸代每螺距牙高圆弧基面上的直径有效基准长度圆锥内螺纹装配余量有效螺纹长度31/2112.3091.4790.317100.38097.372-0.434+0.6404112.3091.4790.317113.030110.072-0.434+0.64041/2112.3091.4790.317125.730122.772-0.434+0.6405112.3091.4790.317138.430135.472-0.434+0.64051/2112.3091.4790.317151.130148.172-0.434+0.6406112.3091.4790.317

5、163.830160.872-0.434+0.640号25.4mm内的牙 数nP/mmh/mm半径r/mm大径d=D/mm中径d2=D 2/mm小径d=D 1/mm螺纹长度/mm基本/mm极限偏差± T1/2最大/mm最小/mm基面轴向位 移的极限偏差± T2/2/mm圈 数/mm圈 数/mm圈 数基本/mm最大/mm最小/mm1/16280.9070.5810.1257.7237.1426.5616.54.00.914.93.11.111/42.5刃46.57.45.61/8280.9070.5810.1259.7289.1478.5666.54.00.914.93.11

6、.111/42.523/46.57.45.61/4191.3370.8760.18413.15712.30111.4459.76.01.317.34.71.711/43.79.711.08.43/8191.3370.8560.18416.66215.80614.95010.16.41.317.75.11.711/43.710.111.48.81/2141.8141.1620.24920.95519.79318.63113.28.21.8110.06.42.311/45.0刃413.215.011.43/4141.8141.1620.24926.44125.27924.11714.59.51.8

7、111.37.72.311/45.0刃414.516.312.71112.3091.4790.31733.24931.77030.29116.810.42.3112.78.12.911/46.423/416.819.114.511/4112.3091.4790.31741.91040.43138.95219.112.72.3115.010.42.911/46.4刃419.121.416.811/2112.3091.4790.31747.80346.32444.84519.112.72.3115.010.42.911/46.4刃419.121.416.82112.3091.4790.31759.

8、61458.13556.65623.415.92.3118.213.62.911/47.531/423.425.721.121/2112.3091.4790.31775.18473.70572.22626.717.53.511/221.014.03.511/29.2426.730.223.23112.3091.4790.31787.88486.40584.92629.820.63.511/224.117.13.511/29.2429.833.326.331/2®112.3091.4790.317100.33098.85197.37231.422.23.511/225.718.73.5

9、11/29.2431.434.927.94112.3091.4790.317113.030111.551110.07235.825.43.511/228.921.93.511/210.441/ 235.839.332.35112.3091.4790.317138.430136.951135.47240.128.63.511/232.125.13.511/211.5540.143.636.66112.3091.4790.317163.830162.351160.87240.128.63.511/232.125.13.511/211.5540.143.636.6注:1.本表适用于圆锥外螺纹与圆锥内

10、螺纹和圆柱内螺纹两种联接形式。2.当内螺纹的结构无螺尾时(空刀槽),有效螺纹长度不应小于表中最小值得0.8倍。3与圆锥外螺纹配合的圆柱内螺纹,其各直径的极限偏差均为圆锥内螺纹基准面轴向位移的1/16尺寸代号为31/2的螺纹,限用于蒸汽机车。60o圆锥管螺纹的基本尺寸(NPT螺纹的尺寸代号每 25.4mm内的螺纹 牙数n基本上的基本直径基准距离L装配余量L3大径(基准直径)d=D/mm中径d2=D>/mm小径d1=D/mm/mm牙数/mm牙数1/16277.8956.3894.0644.322.82231/82710.2428.7364.1024.362.82231/41813.61611

11、.3585.7864.104.23433/81817.05514.7976.0964.324.23431/21421.22318.3218.1284.485.44333/41426.56823.6668.6114.755.4433111.533.22829.69410.1604.606.627311/411.541.98538.45110.6684.836.627311/211.548.05444.52010.6684.836.6273211.560.09256.55811.0745.016.627321/2872.69967.61917.3235.466.35023888.60883.52819.4566.136.350231/28101.31696.23620.8536.576.350248113.973108.89321

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