8-224 BLACK BUNA 90D BACK-UP RING

This back-up ring is supplied in AS568-224 black Buna-N (Nitrile) 90 Shore A with an inside diameter of 1.734 in (44.04 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 2.012 in (51.1 mm), catalogued under part number HB90224. It allows a standard o-ring to operate at higher pressures than it could unsupported.

It resists hydraulic fluids, many alcohols, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) delivers an economical choice for high-volume maintenance programs, strong abrasion and tear resistance. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where strong acids or ketones are present.

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

Stocked as HB90224 and sold individually. Unit weight is approximately 0.697 g and nominal inside diameter is listed as 1 3/4 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.