Rubber O-rings

A rubber oring, also known as a rubber packing, or a rubber toric joint, is a mechanical rubber gasket in the shape of a torus; it is a loop of elastomer with a disc-shaped cross-section, 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 rubber oring; rotating pump shafts and hydraulic cylinders, for example. Joints with motion usually require lubrication of the oring to reduce wear. This is typically accomplished with the fluid being sealed. Rubber orings are one of the most common rubber 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. Rubber orings are one of the simplest, yet most engineered, precise, and useful rubber seal designs ever developed. They are one of the most common and important elements of machine design. Rubber orings are available in various metric and standard sizes. Rubber orings Sizes are specified by the inside diameter and the cross-section diameter (thickness).