O-rings is a kind of rubber seal ring with a circular cross-section. Because of its o-section, it is called O-ring or O-ring. It began to appear in the middle of the 19th century when it was used as a sealing element of a steam-engine cylinder.
O-rings is a kind of rubber seal ring with a circular cross-section. Because of its o-section, it is called O-ring or O-ring. It began to appear in the middle of the 19th century when it was used as a sealing element of a steam-engine cylinder.