8-041 BLACK BUNA 90D BACK-UP RING

This back-up ring is supplied in AS568-041 black Buna-N (Nitrile) 90 Shore A measuring an inside diameter of 2.989 in (75.92 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 3.129 in (79.48 mm), catalogued under part number HB90041. It installs on the low-pressure side of an o-ring to prevent extrusion into the clearance gap at elevated pressure.

Buna-N (Nitrile) delivers low compression set under sustained load and an economical choice for high-volume maintenance programs. The compound resists petroleum-based oils, many alcohols, and water. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Exposure to strong acids or polar solvents will shorten service life.

Common environments for this compound include hydraulic and pneumatic systems, general industrial maintenance, and automotive.

Stocked as HB90041 and sold individually. Unit weight is approximately 0.516 g and nominal inside diameter is listed as 3 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.