8-166 BLACK BUNA 90D BACK-UP RING

This back-up ring is supplied in AS568-166 black Buna-N (Nitrile) 90 Shore A measuring an inside diameter of 6.737 in (171.12 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 6.943 in (176.35 mm), catalogued under part number HB90166. It extends o-ring service life by supporting the seal against extrusion under high pressure.

It resists petroleum-based oils, many alcohols, and water. Buna-N (Nitrile) delivers an economical choice for high-volume maintenance programs, strong abrasion and tear resistance. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Exposure to polar solvents or strong acids will shorten service life.

You will find this material specified across general industrial maintenance, construction equipment, and automotive.

Stocked as HB90166 and sold individually. Unit weight is approximately 1.971 g and nominal inside diameter is listed as 6 3/4 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.