Backup Rings

O-Ring Backup Rings

APG’s O-Ring Backup Rings are secondary sealing components, available in solid or cupped profiles, designed to support primary O-Rings in high-pressure static and dynamic applications. Positioned alongside the O-Ring, backup rings help prevent extrusion into clearance gaps, improving seal reliability and extending service life in hydraulic cylinders and pumps. APG offers broad in-stock availability in common materials such as PTFE and nylon, plus custom kitting to simplify stocking and maintenance.