英制惠氏管螺纹

British Pipe Thread (惠氏管螺纹) -- 圆柱 (BSPP/BSPF) 螺纹代号 基本尺寸 大径 mm d=D 螺距 mm p 每英寸牙数 tpi 中径 mm d2=D2 小径 外螺纹 d3 牙型高度 H1 底孔尺寸 mm G 1/8 1/8＂ 9.728 0.907 28 9.147 8.566 0.581 8.7 G 1/4 1/4＂ 13.157 1.337 19 12.301 11.445 0.856 11.6 G 3/8 3/8＂ 16.662 1.337 19 15.806 14.95 0.856 15 G 1/2 1/2＂ 20.955 1.814 14 19.793 18.631 1.162 19 G 5/8 5/8＂ 22.911 1.814 14 21.749 20.587 1.162 20.75 G 3/4 3/4＂ 26.441 1.814 14 25.279 24.117 1.162 24.5 G 7/8 7/8＂ 30.201 1.814 14 29.039 27.877 1.162 28 G 1 1＂ 33.249 2.309 11 31.77 30.291 1.479 30.5 G 1 1/8 1 1/8＂ 37.897 2.309 11 36.418 34.939 1.479 35 G 1 1/4 1 1/4＂ 41.91 2.309 11 40.431 38.952 1.479 39.5 G 1 3/8 1 3/8＂ 44.323 2.309 11 42.844 41.365 1.479 41.5 G 1 1/2 1 1/2＂ 47.803 2.309 11 46.324 44.845 1.479 45 G 1 3/4 1 3/4＂ 53.746 2.309 11 52.267 50.788 1.479 51 G 2 2＂ 59.614 2.309 11 58.135 56.656 1.479 57 G 2 1/4 2 1/4＂ 65.71 2.309 11 64.231 62.752 1.479 63 G 2 1/2 2 1/2＂ 75.184 2.309 11 73.705 72.226 1.479 72.5 G 2 3/4 2 3/4＂ 81.534 2.309 11 80.055 78.576 1.479 79 G 3 3＂ 87.884 2.309 11 86.405 84.926 1.479 85.5 G 3 1/4 3 1/4＂ 93.98 2.309 11 92.501 91.022 1.479 91 G 3 1/2 3 1/2＂ 100.33 2.309 11 98.351 97.372 1.479 97.75 G 3 3/4 3 3/4＂ 106.68 2.309 11 105.201 103.722 1.479 104 G 4 4＂ 113.03 2.309 11 111.55 110.072 1.479 110.5 G 4 1/2 4 1/2＂ 125.73 2.309 11 124.251 122.772 1.479 123 G 5 5＂ 138.43 2.309 11 136.951 135.472 1.479 136 G 5 1/2 5 1/2＂ 151.13 2.309 11 149.651 148.172 1.479 148.5 G 6 6＂ 163.83 2.309 11 162.351 160.872 1.479 161.5