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1、非螺纹密封的管螺纹基本尺寸及公差GB7306-87用螺纹密封的管螺纹基本尺寸及公差GB7306-87圆柱管螺纹钻底孔 用钻头直径尺寸表头直径尺寸表尺寸代号25.4mm 内的 牙数n螺距Pmm牙高hmm圆弧半径rmm基面上的直径外螺纹内螺纹大径d=Dmm中径d2=D2mm小径d1=D1mm大径公差Td中径公差Td2中径公差TD2小径公差TD1下偏差mm上偏差mm下偏;i皇mm上偏差mm下偏差mm上偏差mm下偏差mm上偏差mmA级B级1/16280.9070.5810.1257.7237.1426.561-0.2140-0.107-0.21400+0.100+0.2821/8280.9070.58
2、10.1259.7289.147& 566-0.2140-0.107-0.21400+0.100+0.2821/4191.3370.8560.18413.1512.3011.445-0.2500-0.125-0.25000+0.120+0.4453/8191.3370.8560.18416.6615.8014.950-0.2500-0.125-0.25000+0.120+0.4451/2141.8141.1620.24920.9519.7918.631-0.2840-0.142-0.28400+0.140+0.5415/8141.8141.1620.24922.91121.7420.587-0
3、.2840-0.142-0.28400+0.140+0.5413/4141.8141.1620.24926.4425.2724.117-0.2840-0.142-0.28400+0.140+0.5417/8141.8141.1620.24930.2029.0327.887-0.2840-0.142-0.28400+0.140+0.5411112.3091.4790.31733.2431.7730.291-0.3600-0.180-0.36000+0.180+0.6401l/3112.3091.4790.31737.8936.4134.939-0.3600-0.180-0.36000+0.180
4、+0.64011/4112.3091.4790.31741.9140.4338.952-0.3600-0.180-0.36000+0.180+0.64011/2112.3091.4790.31747.8046.3244.845-0.3600-0.180-0.36000+0.180+0.64013/4112.3091.4790.31753.7452.2750.788-0.3600-0.180-0.36000+0.180+0.6402112.3091.4790.31759.615&1356.656-0.3600-0.180-0.36000+0.180+0.64021/4112.3091.4790.
5、31765.7164.2362.752-0.4340-0.217-0.43400+0.210+0.64021/2112.3091.4790.31775.1873.7072.226-0.4340-0.217-0.43400+0.210+0.64023/4112.3091.4790.31781.5380.0587.576-0.4340-0.217-0.43400+0.210+0.6403112.3091.4790.31787.8886.4084.926-0.4340-0.217-0.43400+0.210+0.64031/2112.3091.4790.317100.39&8597.372-0.43
6、40-0.217-0.43400+0.210+0.6404112.3091.4790.317113.03111.55110.07-0.4340-0.217-0.43400+0.210+0.64041/2112.3091.4790.317125.7124.2122.77-0.4340-0.217-0.43400+0.210+0.6405112.3091.4790.317138.4136.9135.47-0.4340-0.217-0.43400+0.210+0.64051/2112.3091.4790.317151.1149.6148.17-0.4340-0.217-0.43400+0.210+0
7、.6406112.3091.4790.317163.8162.3160.87-0.4340-0.217-0.43400+0.210+0.640螺纹特征代号用 G 表示 -LH 表示左旋螺纹公制螺纹钻底孔用钻尺 寸 代 号25.4mm内的 牙数n螺距Pmm牙高hmm圆弧 半径rmm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=Dmm中径d2=D2mm小径d1=D1mm基本mm极限偏差+T1/2最大mm最小mmmm圈数基本mm最大mm最小mmmm圈数mm圈数1/16280.9070.5810.1257.2327.1426.56
8、16.54.00.914.93.11.111/42.523/46.57.45.61/8280.9070.5810.1259.7289.1478.5666.54.00.914.93.11.111/42.523/46.57.45.61/4191.3370.8560.18413.15712.30111.4459.76.01.317.34.71.711/43.723/49.711.08.43/8191.3370.8560.18416.66215.80614.95010.16.41.317.75.11.711/43.723/410.111.48.81/2141.8141.1620.24920.99519
9、.79318.63113.28.21.8110.06.42.311/45.023/413.215.011.43/4141.8141.1620.24926.44125.27924.11714.59.51.8111.37.72.311/45.023/414.516.312.71112.3091.4790.31733.24931.77030.29116.810.42.3112.78.12.911/46.423/416.819.114.511/4112.3091.4790.31741.91040.43138.95219.112.72.3115.010.42.911/46.423/419.121.416
10、.811/2112.3091.4790.31747.80346.32444.84519.112.72.3115.010.42.911/46.423/419.121.416.82112.3091.4790.31759.61458.13556.65623.415.92.311&213.62.911/47.531/423.425.721.121/2112.3091.4790.31775.18473.70572.22626.717.53.511/221.014.03.511/29.2426.730.223.23112.3091.4790.31787.88486.40584.92629.820.63.5
11、11/224.117.13.511/29.2429.833.326.331/2112.3091.4790.317100.33098.85197.37231.422.23.511/225.71&73.511/29.2431.434.927.94112.3091.4790.317113.030111.551110.07235.825.43.511/22&921.93.511/210.441/235.839.332.35112.3091.4790.317138.430136.951135.47240.128.63.511/232.125.13.511/211.5540.143.636.66112.3091.479
