8-163 BLACK BUNA 90D BACK-UP RING

Part number HB90163 is an AS568-163 black Buna-N (Nitrile) 90 Shore A Back-Up Ring measuring an inside diameter of 5.987 in (152.07 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 6.193 in (157.3 mm). A back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.

This material stands up to greases and lubricants, water, and many alcohols. Buna-N (Nitrile) is valued for strong abrasion and tear resistance, an economical choice for high-volume maintenance programs. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Exposure to polar solvents or ketones will shorten service life.

You will find this material specified across general industrial maintenance, hydraulic and pneumatic systems, and automotive.

Reference part number HB90163 when ordering; the item is sold individually. Unit weight is approximately 1.728 g and nominal inside diameter is listed as 6 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.