8-172 BLACK BUNA 90D BACK-UP RING

Part number HB90172 is an AS568-172 black Buna-N (Nitrile) 90 Shore A Back-Up Ring supplied with an inside diameter of 8.237 in (209.22 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 8.443 in (214.45 mm). A back-up ring allows a standard o-ring to operate at higher pressures than it could unsupported.

Buna-N (Nitrile) is known for reliable performance in both static and dynamic service, the most widely specified general-purpose sealing elastomer. The material holds up against petroleum-based oils, hydraulic fluids, and many alcohols. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with polar solvents or ozone and direct sunlight.

Typical settings include fluid power, automotive, and agricultural equipment.

This item is sold individually under part number HB90172. Unit weight is approximately 2.34 g and nominal inside diameter is listed as 8 1/4 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.