Hollow metal O-ring is a kind of special sealing member rounded with thin-wall steel pipe, stainless steel pipe, monel pipe or inconel pipe, through welding and polishing of its joint.

• 金属空心O形圈,是将薄壁的钢管、不锈钢管、蒙乃尔合金管或因科镍合金管弯成圆形,再将接口焊接、打磨而形成的一种特殊密封件。