Iron piston rings are available for reciprocating or rotary applications. Our standard iron piston ring features a unique overlapping/interlocking joint design. It can be used in bi-directional sealing applications at pressures up to 5,000 PSI. The joint cut design compensates for ring and cylinder wear during operation. It has become the hydraulic cylinder standard, where high pressure, high temperature, radiation, thermal fatigue, and reliability requirements make normal seals undesirable.