相等外六角接头。天然黄铜和镀镍黄铜六角接头都是可用的。螺纹标准和类型R, PT, BSPT——55°锥管螺纹公制螺纹R1/8 R1/4 R3/8 R1/2 R3/4 R1 M5 x 0.8 M6 x 1 M8 x 1 M10 x 1 M12 x 1.25 M14 x 1.5 M16 1.5 x 1.5 M20 UNF NPT-60°美国标准锥管螺纹BSPP, G-55°平行管螺纹10-32UNF NPT1/8 NPT1/4 NPT3/8 NPT1/2 NPT3/4 NPT1 G1/8 G1/4 G3/8 G1/2 G3/4 G1