O-rings are a one piece object usually molded from elastomeric material. O-rings are in the shape of a torus (donut shape). O-rings can form a static or dynamic seal. A static o-ring seal is used for containing a pressure or maintaining a vacuum. Dynamic o-ring seals can be reciprocating or rotating. An o-ring, when installed, compresses and deforms slightly into the free space within the groove to form a proper seal. O-rings are capable of sealing thousands of PSI pressure. O-rings are one of the most common seals used in machine design. O-rings are one of the most inexpensive seals and easy to make. O-rings are reliable and have simple mounting requirements. And o-ring is measured by its inner and outer diameters. O-rings are described by material composition and hardness. O-rings are typically available in standard sizes per industry standards. O-rings are available in both metric and inch sizes. O-ring selection is based on chemical compatibility, application temperature, sealing pressure, lubrication requirements, quality, quantity and cost. O-rings can also be machined with a CNC lathe.
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