Engineered for demanding hydraulic applications, this Buna-N (NBR) O-ring delivers reliable sealing performance across a wide range of industrial fluid systems. With a 70A Shore durometer hardness, it strikes the optimal balance between flexibility and compression resistance — holding a consistent seal under dynamic pressure cycling without extruding or taking a permanent set.
Key Features
Material: Nitrile (Buna-N / NBR) — industry-standard elastomer for petroleum-based oils, hydraulic fluids, and fuels
Durometer: 70A Shore — medium hardness ideal for static and dynamic hydraulic sealing
Temperature Range: -40°F to +250°F (-40°C to +121°C)
Pressure Rating: Suitable for low-to-medium pressure hydraulic circuits (groove and gland design dependent)
Standards: Manufactured to AS568 dimensional specifications for drop-in compatibility with standard glands
Applications
Hydraulic cylinders and actuators
Pump and valve body sealing
Fluid power connectors and fittings
Mobile and industrial hydraulic systems
Chemical Compatibility
Excellent resistance to petroleum oils, diesel fuel, mineral-based hydraulic fluids, and water-glycol solutions. Not recommended for use with ketones, strong acids, or ozone-rich environments — consider FKM or EPDM alternatives for those media.
Sold individually. Available in standard AS568 dash sizes — select your dash number from the variant options above.
