8-362 BLACK BUNA 90D BACK-UP RING

This back-up ring is supplied in AS568-362 black Buna-N (Nitrile) 90 Shore A supplied with an inside diameter of 6.225 in (158.12 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 6.645 in (168.78 mm), catalogued under part number HB90362. It allows a standard o-ring to operate at higher pressures than it could unsupported.

The compound resists hydraulic fluids, petroleum-based oils, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) offers strong abrasion and tear resistance, an economical choice for high-volume maintenance programs. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C).

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

Stocked as HB90362 and sold individually. Unit weight is approximately 5.3117 g and nominal inside diameter is listed as 6 1/4 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.