55° 圆柱管螺纹的型式和尺寸 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 " 28 G 1/4 1/4 " 19 G 3/8 3/8 " 19 15 G 1/2 1/2 " 14 19 G 5/8 5/8 " 14 G 3/4 3/4 " 14 G 7/8 7/8 " 14 28 G11" 11 G1 1/8 1 1/8 " 11 35 G1 1/4 1 1/4 " 11 G1 3/8 1 3/8 " 11 G1 1/2 1 1/2 " 11 45 G1 3/4 1 3/4 " 11 51 G22" 11 57 G2 1/4 2 1/4 " 11 63 G2 1/2 2 1/2 " 11 G2 3/4 2 3/4 " 11 79 G33" 11 G3 1/4 3 1/4 " 11 91 G3 1/2 3 1/2 " 11 G3 3/4 3 3/4 " 11 104 G44" 11 G4 1/2 4 1/2 " 11 123 G55" 11 136 G5 1/2 5 1/2 "
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