8-237 BLACK BUNA 90D BACK-UP RING

Part number HB90237 is an AS568-237 black Buna-N (Nitrile) 90 Shore A Back-Up Ring with an inside diameter of 3.359 in (85.32 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 3.637 in (92.38 mm). A back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.

As a material, Buna-N (Nitrile) delivers low compression set under sustained load, reliable performance in both static and dynamic service. This material stands up to hydraulic fluids, many alcohols, and greases and lubricants. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Exposure to polar solvents or strong acids will shorten service life.

Common environments for this compound include fluid power, agricultural equipment, and construction equipment.

HB90237 ships individually. Unit weight is approximately 1.2596 g and nominal inside diameter is listed as 3 3/8 inch. Review your operating media and conditions against this specification before installation.