8-232 BLACK BUNA 90D BACK-UP RING

This back-up ring is supplied in AS568-232 black Buna-N (Nitrile) 90 Shore A with an inside diameter of 2.734 in (69.44 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 3.012 in (76.5 mm), catalogued under part number HB90232. It bridges the extrusion gap so the primary seal holds its shape under load.

As a material, Buna-N (Nitrile) is valued for the most widely specified general-purpose sealing elastomer, reliable performance in both static and dynamic service. The material holds up against greases and lubricants, petroleum-based oils, and propane and butane. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C).

Maintenance and OEM teams specify it across general industrial maintenance, automotive, and construction equipment.

Order part number HB90232, sold individually. Unit weight is approximately 1.0172 g. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.