网 60°圆锥管螺纹的基本牙型和基本尺寸(GB/T12716-1991) ???????(mm) P＝25.4／n H＝0.866025P h＝0.8P f＝0.033P 螺纹 尺寸 代号 每25.4mm 内的螺 纹牙数 n 基面上的基本直径 基准距离L1 装配余量L3 管子外径 圆锥外螺 纹小端面 处的螺纹 小 径 大径 (基准直径) d＝D 中径 d2＝D2 小径 d1＝D1 距离 牙数 距离 牙数 1／16 27 7.895 7.142 6.389 4.064 4.32 2.822 3 7.938 6.135 1／8 27 10.242 9.489 8.736 4.102 4.36 2.822 3 10.287 8.480 1／4 18 13.616 12.487 11.358 5.786 4.10 4.234 3 13.716 10.997 3／8 18 17.055 15.926 14.797 6.096 4.32 4.234 3 17.145 14.416 1／2 14 21.223 19.772 18.321 8.128 4.48 5.443 3 21.336 17.813 3／4 14 26.568 25.117 23.666 8.611 4.75 5.443 3 26.670 23.128 1 11.5 33.228 31.461 29.694 10.160 4.60 6.627 3 33.401 29.059 11.5 41.985 40.218 38.451 10.668 4.83 6.627 3 42.164 37.784 11.5 48.054 46.287 44.520 10.688 4.83 6.627 3 48.260 43.854 2 11.5 60.092 58.325 56.558 11.074 5.01 6.627 3 60.325 55.866 8 72.699 70.159 67.619 17.323 5.46 6.350 2 73.025 66.536 3 8 88.608 86.068 83.528 19.456 6.13 6.350 2 88.900 82.312 8 101.316 98.776 96.236 20.853 6.57 6.350 2 101.600 94.932 4 8 113.973 111.433 108.893 21.438 6.75 6.350 2 114.300 107.553 5 8 140.952 138.412 135.872 23.800 7.50 6.350 2 141.300 134.384 6 8 167.792 165.252 162.712 24.333 7.66 6.350 2 168.275 161.191 8 8 218.441 215.901 213.361 27.000 8.50 6.350 2 219.075 211.673 10 8 272.312 269.772 267.232 30.734 9.68 6.350 2 273.050 265.311 12 8 323.032 320.492 317.952 34.544 10.88 6.350 2 323.850 315.793
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