8-275 BLACK BUNA 90D BACK-UP RING

HB90275 is an AS568-275 black Buna-N (Nitrile) 90 Shore A Back-Up Ring measuring an inside diameter of 10.484 in (266.29 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 10.762 in (273.35 mm). In service, this back-up ring allows a standard o-ring to operate at higher pressures than it could unsupported.

The compound resists petroleum-based oils, propane and butane, and water. Buna-N (Nitrile) is known for an economical choice for high-volume maintenance programs, strong abrasion and tear resistance. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Applications involving ketones or ozone and direct sunlight call for a different compound.

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

Reference part number HB90275 when ordering; the item is sold individually. Unit weight is approximately 3.852 g and nominal inside diameter is listed as 10 1/2 inch. 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.