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1、用螺纹密封的管螺纹基本尺寸及公差肉外蠶型frtf fflnf；尺寸代 号每25.4mm内的牙数n螺距p牙咼h圆弧半 径r基面上的直径基准长 度基 本有效螺 纹长度装配余量大径（基准 直径）d=D中径d2小径d1=D1余量圈数1/16280.9070.5810.1257.7237.1426.56146.52.52+3/41/8280.9070.5810.1259.7289.147& 56646.52.52+3/41/4191.3370.8560.18413.15712.30111.44569.73.72+3/43/8191.3370.8560.18416.66215.80614.956.410.
2、13.72+3/41/2141.8141.1620.24920.95519.79318.631&213.252+3/43/4141.8141.1620.24926.44125.27924.1179.514.552+3/41112.3091.4790.31733.24931.7730.29110.416.86.42+3/41+1/4112.3091.4790.31741.9140.43138.95212.719.16.42+3/41+1/2112.3091.4790.31747.80346.32444.84512.719.16.42+3/42112.3091.4790.31759.61458.1
3、3556.65615.923.47.53+1/42+1/2112.3091.4790.31775.18473.70572.22617.526.79.243112.3091.4790.31787.88486.40584.92620.629.89.243+1/2112.3091.4790.317100.3398.85197.37222.231.49.244112.3091.4790.317113.03111.551110.07225.435.810.44+1/45112.3091.4790.317138.43136.951135.47228.640.111.556112.3091.4790.317
4、163.83162.351160.87228.640.111.551. 本标准包括了圆锥内螺纹和圆柱内螺纹与圆锥外螺纹两种联接形式。2. 本标准适用于管子、管接头、旋塞、阀门和其它螺纹联接的附件。3. 当内螺纹的结构无螺尾时，有效螺纹的长度不应小于表中最小值的80%。G1/4 螺纹的基本尺寸：大径13.157，小径为11.445外螺纹时大径公差为+0-0.25，中径公差A级为+0-0.125, B级为+0-0.25； 内螺纹时中径公差为+0.125-0，小径公差为+0.445-0。1/8螺纹的参数：外螺纹外径为10.026,内径为：8.27,螺纹有效长度：9每英寸牙数28螺距为0.907公称通径为6以上单位:毫米
