Engineered for reliable sealing in demanding hydraulic and pneumatic systems, our Buna-N (Nitrile) O-Rings deliver consistent performance across a wide range of industrial applications. With a 70A Shore durometer hardness, these O-rings strike the ideal balance between flexibility and compression resistance — providing a tight, leak-free seal under pressure.
Material & Construction
Material: Buna-N (Nitrile Rubber / NBR)
Durometer: 70A Shore (medium hardness)
Color: Black
Standard: AS568 compliant
Performance Specifications
Temperature Range: -40°F to +250°F (-40°C to +121°C)
Pressure Rating: Suitable for hydraulic systems up to 1,500 PSI (with appropriate back-up rings)
Fluid Compatibility: Petroleum-based oils and fluids, hydraulic fluids, water, diesel fuel, and many common industrial lubricants
Key Features
Excellent resistance to petroleum-based hydraulic fluids and oils
Low compression set for long-term sealing integrity
Good abrasion and tear resistance
Suitable for static and dynamic sealing applications
Consistent dimensional tolerances for reliable fit
Common Applications
Hydraulic cylinders and actuators
Pneumatic fittings and valves
Pumps, motors, and manifolds
Industrial machinery and fluid power systems
Note: For high-pressure applications exceeding 1,500 PSI, use in conjunction with AS568-compliant back-up rings to prevent extrusion.
