8-153 BLACK BUNA 90D BACK-UP RING

This back-up ring is supplied in AS568-153 black Buna-N (Nitrile) 90 Shore A with an inside diameter of 3.487 in (88.57 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 3.693 in (93.8 mm), catalogued under part number HB90153. It bridges the extrusion gap so the primary seal holds its shape under load.

Buna-N (Nitrile) is specified here for most widely specified general-purpose sealing elastomer and economical choice for high-volume maintenance programs. The material holds up against water, propane and butane, and greases and lubricants. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Exposure to ozone and direct sunlight or strong acids will shorten service life.

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

Stocked as HB90153 and sold individually. Unit weight is approximately 1.0282 g. As always, verify media compatibility and operating conditions against the requirements of your specific application. For a size or compound outside the standard catalog, APG can quote from a print or sample.