O-ring

An O-ring is a loop of elastomer with a round (o-shaped) cross-section used as a mechanical seal. They are designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface.

Related Topics:
Elastomer - Seal

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The joint may be static, or (in a few circumstances) have relative motion between parts and o-ring (rotating pump shafts and hydraulic cylinders, for example). Joints with motion usually require lubrication of the o-ring to reduce wear. This is often accomplished with the fluid being sealed.

Related Topics:
Pump - Hydraulic cylinder - Lubrication

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O-rings are one of the most popular seals used in machine design because they are inexpensive and easy to make, reliable, and have simple mounting requirements. They can seal tens of megapascals (thousands of psi) pressure.

Related Topics:
Mega - Pascal - Psi

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In some cases, O-rings are used with back-up rings.

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