8-004 BLACK BUNA 90D BACK-UP RING

This back-up ring is supplied in AS568-004 black Buna-N (Nitrile) 90 Shore A built to an inside diameter of 0.07 in (1.78 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 0.21 in (5.33 mm), catalogued under part number HB90004. It allows a standard o-ring to operate at higher pressures than it could unsupported.

Buna-N (Nitrile) is specified here for economical choice for high-volume maintenance programs, reliable performance in both static and dynamic service. Expect good resistance to water, hydraulic fluids, and petroleum-based oils. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Applications involving strong acids or automotive brake fluid call for a different compound.

Typical settings include fluid power, hydraulic and pneumatic systems, and automotive.

This item is sold individually under part number HB90004. Unit weight is approximately 0.0282 g. As always, verify media compatibility and operating conditions against the requirements of your specific application.