O-Rings are a kind of rubber seals which has round section. As the cross section is O type, so it is named O-Ring rubber seals. It is produced by the middle of the 19th century and used for steamer air cylinder.
O-rings are the most normally seals for mechanical design as cheap price, simple process, stable function and simple requirement for installation. O-rings can bear big pressure. It can used for static application and dynamic application. Such as the rod of rotary pump and piston of hydraulic cylinder.