An O-ring is a loop of
elastomer with a round (o-shaped) cross-section used as a mechanical
seal or
gasket. They are designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface. The joint may be static, or (in some designs) have relative motion between the parts and the 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 typically accomplished with the fluid being sealed.O-rings are one of the most common 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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