Hydraulic cylinder seals are used to seal the opening between various components in the hydraulic cylinder and are exposed to hydraulic fluids such as hydrocarbon and phosphate ester and are designed for high-pressure dynamic applications such as hydraulic cylinders. Hydraulic seals usually need to be higher friction seals than pneumatic seals but often operate under lower operating speeds.

The sealing orientation for hydraulic seals can include internal (rod seal), external (piston seal), symmetrical or axial seal. With the internal (rod) seal, the seal is fit into a housing bore and the sealing lip touches the shaft.

The life of hydraulic seals is dependent on many factors including the maximum operating speed, maximum operating temperature, maximum operating pressure and the vacuum rating. When ordering hydraulic seals you will want to know the shaft outer diameter or seal inner diameter, housing bore diameter or seal outer diameter, the axial cross section and the radial cross section.

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