... be sealed with low tightening force Ring joint gasketSpecificationDescription:Metal O-ring is unique gasket made of metal tube which is formed and buttwelded ... equipments, plastic forming machines, on joints in aircrafts, pile. On joint in aircrafts, pile, vacuum equipments, combustion engines, electronic apparatus, ... plating250 ~ 260 -250 ~ 650 -250 ~ 760 -250 ~ 700Surface treatment Metal ring gasket