8-262 BLACK BUNA 90D BACK-UP RING

This back-up ring is supplied in AS568-262 black Buna-N (Nitrile) 90 Shore A with an inside diameter of 6.984 in (177.39 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 7.262 in (184.45 mm), catalogued under part number HB90262. It extends o-ring service life by supporting the seal against extrusion under high pressure.

Buna-N (Nitrile) is specified here for reliable performance in both static and dynamic service, most widely specified general-purpose sealing elastomer. The compound resists greases and lubricants, water, and many alcohols. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Exposure to strong acids or ozone and direct sunlight will shorten service life.

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

This item is sold individually under part number HB90262. Unit weight is approximately 2.6444 g. Application requirements vary, so validate compatibility with your process conditions prior to installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.