8-436 BLACK BUNA 90D BACK-UP RING

This back-up ring is supplied in AS568-436 black Buna-N (Nitrile) 90 Shore A measuring an inside diameter of 5.85 in (148.59 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 6.4 in (162.56 mm), catalogued under part number HB90436. It bridges the extrusion gap so the primary seal holds its shape under load.

Buna-N (Nitrile) is specified here for low compression set under sustained load and economical choice for high-volume maintenance programs. Expect good resistance to propane and butane, greases and lubricants, and petroleum-based oils. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with polar solvents or ketones.

Common environments for this compound include general industrial maintenance, construction equipment, and agricultural equipment.

Stocked as HB90436 and sold individually. Unit weight is approximately 10.429 g. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.