8-471 BLACK BUNA 90D BACK-UP RING

This back-up ring is supplied in AS568-471 black Buna-N (Nitrile) 90 Shore A with an inside diameter of 21.955 in (557.66 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 22.505 in (571.63 mm), catalogued under part number HB90471. It installs on the low-pressure side of an o-ring to prevent extrusion into the clearance gap at elevated pressure.

Buna-N (Nitrile) is specified for the most widely specified general-purpose sealing elastomer and an economical choice for high-volume maintenance programs. It resists hydraulic fluids, propane and butane, and many alcohols. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C).

Common environments for this compound include hydraulic and pneumatic systems, fluid power, and automotive.

Stocked as HB90471 and sold individually. Unit weight is approximately 37.8933 g and nominal inside diameter is listed as 22 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.