8-173 BLACK BUNA 90D BACK-UP RING

Part number HB90173 is an AS568-173 black Buna-N (Nitrile) 90 Shore A Back-Up Ring supplied with an inside diameter of 8.487 in (215.57 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 8.693 in (220.8 mm). A back-up ring bridges the extrusion gap so the primary seal holds its shape under load.

The material holds up against propane and butane, greases and lubricants, and hydraulic fluids. Buna-N (Nitrile) is known for an economical choice for high-volume maintenance programs, reliable performance in both static and dynamic service. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C).

Common environments for this compound include automotive, construction equipment, and general industrial maintenance.

Stocked as HB90173 and sold individually. Unit weight is approximately 2.4349 g. Review your operating media and conditions against this specification before installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.