G,ZG,NPT螺纹基本尺寸

1、圆锥管螺纹的基本尺寸圆柱管螺纹基本尺寸圆柱管螺纹的公差尺寸代号每25.4mm内的牙数螺距牙高圆弧半径基本直径外螺纹内螺纹nPhr大径中径小径大径公差Td小径公差TD1/mm/mm/mmd=Da=D 2d1=D1下偏差 /mm上偏差 /mm/mm/mm/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+0.44

2、51/2141.8141.1620.24920.95518.631-0.284+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.

3、360+0.64011/2112.3091.4790.31747.80344.845-0.360+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+0.640已4112.3091.4790.31781.53478.576-0.434+0.6403112.3091.4790.31787.88484

4、.926-0.434+0.64031/2112.3091.4790.317100.38097.372-0.434+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+0.6406112.3091.4790.317163.830160.872-0.434+0.640尺寸代号每25.4mm内

5、的牙 数n螺距P/mm牙高h/mm圆弧半径r/mm基面上的直径有效螺纹 长度/mm基准长度圆锥内螺纹 基面轴向位 移的极限偏差± T2/2装配余量有效螺纹长度大径d=D/mm中径d?=D 2/mm小径d=D 1/mm基本/mm极限偏差± T1/2最大/mm最小/mm/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46.57.45.61/8280.9070.5810.1259.7289.1478.5666.54.00.914.93.1

6、1.111/42.56.57.45.61/4191.3370.8760.18413.15712.30111.4459.76.01.317.34.71.711/43.7刃49.711.08.43/8191.3370.8560.18416.66215.80614.95010.16.41.317.75.11.711/43.710.111.48.81/2141.8141.1620.24920.95519.79318.63113.28.21.8110.06.42.311/45.013.215.011.43/4141.8141.1620.24926.44125.27924.11714.59.51.8111

7、.37.72.311/45.014.516.312.71112.3091.4790.31733.24931.77030.29116.810.42.3112.78.12.911/46.416.819.114.511/4112.3091.4790.31741.91040.43138.95219.112.72.3115.010.42.911/46.4刃419.121.416.811/2112.3091.4790.31747.80346.32444.84519.112.72.3115.010.42.911/46.423/419.121.416.82112.3091.4790.31759.61458.1

8、3556.65623.415.92.3118.213.62.911/47.531/423.425.721.121/2112.3091.4790.31775.18473.70572.22626.717.53.511/221.014.03.511/29.2426.730.223.23112.3091.4790.31787.88486.40584.92629.820.63.511/224.117.13.511/29.2429.833.326.331/2®112.3091.4790.317100.33098.85197.37231.422.23.511/225.718.73.511/29.2

9、431.434.927.94112.3091.4790.317113.030111.551110.07235.825.43.511/228.921.93.511/210.441/235.839.332.35112.3091.4790.317138.430136.951135.47240.128.63.511/232.125.13.511/211.5540.143.636.66112.3091.4790.317163.830162.351160.87240.128.63.511/232.125.13.511/211.5540.143.636.6注：1.本表适用于圆锥外螺纹与圆锥内螺纹和圆柱内螺纹

10、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L1装配余量L3大径（基准直径）d=D/mm中径d2=D2/mm小径d1=D1/mm/mm牙数/mm牙数1/16277.8956.3894.0644.322.82231/82710.2428.7364.1024.362.82231/41813.61611.3585.7864

11、.104.23433/81817.05514.7976.0964.324.23431/21421.22318.3218.1284.485.44333/41426.56823.6668.6114.755.4433111.533.22829.69410.1604.606.627311/411.541.98538.45110.6684.836.627311/211.548.05444.52010.6684.836.6273211.560.09256.55811.0745.016.627312 /2872.69967.61917.3235.466.35023888.60883.52819.4566.136.350231/28101.31696.23620.8536.576.350248113.973108.89321.