8-325 BLACK BUNA 90D BACK-UP RING

This back-up ring is supplied in AS568-325 black Buna-N (Nitrile) 90 Shore A with an inside diameter of 1.475 in (37.47 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 1.895 in (48.13 mm), catalogued under part number HB90325. It bridges the extrusion gap so the primary seal holds its shape under load.

As a material, Buna-N (Nitrile) is valued for the most widely specified general-purpose sealing elastomer and low compression set under sustained load. It resists hydraulic fluids, water, and many alcohols. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C).

You will find this material specified across hydraulic and pneumatic systems, general industrial maintenance, and construction equipment.

This item is sold individually under part number HB90325. Unit weight is approximately 1.4151 g. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. For a size or compound outside the standard catalog, APG can quote from a print or sample.