Available in a variety of types including R21 (rubber-covered), R4 (metal-cased),
Standard (metal-cased leather), R23 (rubber-covered with dust lip), R5 (double-sprung) and R6 (metal-cased with dust lip).
Nitrile rubber provides the normal sealing medium but Viton tends to be used for high temperatures or chemical-handling applications.
Most oils seals are designed to handle 0.5 bar pressure, however, PTFE seals can hold pressures of up to 10 bar. Split seals can be used to avoid having to