8-212 BLACK BUNA 90D BACK-UP RING

Part number HB90212 is an AS568-212 black Buna-N (Nitrile) 90 Shore A Back-Up Ring with an inside diameter of 0.859 in (21.82 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 1.137 in (28.88 mm). A back-up ring allows a standard o-ring to operate at higher pressures than it could unsupported.

Buna-N (Nitrile) is specified here for reliable performance in both static and dynamic service, economical choice for high-volume maintenance programs. The material holds up against greases and lubricants, hydraulic fluids, and water. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with strong acids or automotive brake fluid.

Typical settings include fluid power, automotive, and agricultural equipment.

Stocked as HB90212 and sold individually. Unit weight is approximately 0.358 g. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.