Engineered for demanding hydraulic and pneumatic sealing applications, this Buna-N (NBR) O-ring delivers reliable performance under high-pressure conditions. The 90A Shore A durometer rating provides a firmer compound that resists extrusion and maintains dimensional stability in dynamic sealing environments — ideal for hydraulic cylinders, pumps, valves, and actuators.
Key Features
Material: Buna-N (Nitrile Butadiene Rubber / NBR)
Durometer: 90A Shore A — firm compound for high-pressure, low-clearance applications
Temperature Range: -40°F to +250°F (-40°C to +121°C)
Pressure Rating: Suitable for high-pressure hydraulic systems; recommended for use with back-up rings at elevated pressures
Fluid Compatibility: Petroleum-based hydraulic oils, mineral oils, diesel fuel, water-glycol fluids, and most aliphatic hydrocarbons
Conforms to: AS568 standard dash sizes
Typical Applications
Hydraulic cylinders and actuators
Pumps and motors
Valves and manifolds
Pneumatic fittings and connectors
Note: Not recommended for use with phosphate ester fluids, ketones, esters, or highly aromatic fuels. For dynamic applications at pressures above 1,500 PSI, use with a PTFE or nylon back-up ring to prevent extrusion.
