8-143 BLACK BUNA 90D BACK-UP RING

This back-up ring is supplied in AS568-143 black Buna-N (Nitrile) 90 Shore A built to an inside diameter of 2.425 in (61.6 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.631 in (66.83 mm), catalogued under part number HB90143. It bridges the extrusion gap so the primary seal holds its shape under load.

Buna-N (Nitrile) offers low compression set under sustained load, reliable performance in both static and dynamic service. Expect good resistance to hydraulic fluids, many alcohols, and petroleum-based oils. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Verify compatibility before use with ketones or ozone and direct sunlight.

Common environments for this compound include general industrial maintenance, automotive, and fluid power.

HB90143 ships individually. Unit weight is approximately 0.7115 g. As always, verify media compatibility and operating conditions against the requirements of your specific application. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.