O-rings are a kind of rubber sealing rings with a circular cross-section, which are called O-rings because of their O-shaped cross-sections, also known as O-rings. It began to appear in the middle of the 19th century, when it was used as a sealing element for steam engine cylinders.
O-rings are the most common mechanical design for seals because they are inexpensive, simple to manufacture, reliable to function, and simple to install. O-rings are subjected to tens of megapascals (kilopounds) of pressure. O-rings can be used in static applications or in dynamic applications where there is relative movement between components, such as the shaft of a rotary pump and the piston of a hydraulic cylinder.