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.

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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.

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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.

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

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Elastomer: The term elastomer is often used interchangeably with the term rubber, and is preferred when referring to vulcanisates. They are amorphous polymers existing above their glass transition temperature, so that considerable segmental motion is possible. At ambient temperatures rubbers are thus relativel...

Seal: Seal or SEAL may refer to:...

Pump: A pump is a mechanical device used to move liquids or gases....

O-ring related Images and Photos (experimental)

Ring O' Roses circa1880	Six Children Dance in a Circle to Play Ring O' Roses	Ring	Ringo Starr: Y Not CD
Ringo Starr: Y Not CD	Ringo Starr: Choose Love	Ringo Starr: Choose Love	Ring a Ring a Roses
Ringo Star Anthology	Power Ring	Sundial Ring	Ring Necked Pheasant