O-rings O-rings (O-rings) are a kind of rubber sealing ring with a circular cross-section. Because the cross-section is O-shaped, it is called O-ring rubber sealing ring, also called O-ring. It began to appear in the middle of the 19th century, when it was used as a sealing element for steam engine cylinders.

Because of its low price, simple manufacturing, reliable function, and simple installation requirements, O-rings are the most common mechanical design for sealing. The O-ring bears a pressure of tens of megapascals (thousand pounds). O-rings can be used in static applications as well as dynamic applications where there is relative movement between components, such as the shaft of a rotary pump and the piston of a hydraulic cylinder.

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