8-214 BLACK BUNA 90D BACK-UP RING

The HB90214 is an AS568-214 black Buna-N (Nitrile) 90 Shore A Back-Up Ring built to an inside diameter of 0.984 in (24.99 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 1.262 in (32.05 mm). This back-up ring allows a standard o-ring to operate at higher pressures than it could unsupported.

The compound resists propane and butane, petroleum-based oils, and greases and lubricants. Buna-N (Nitrile) is known for an economical choice for high-volume maintenance programs and low compression set under sustained load. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service.

You will find this material specified across hydraulic and pneumatic systems, fluid power, and automotive.

HB90214 ships individually. Unit weight is approximately 0.411 g and nominal inside diameter is listed as 1 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. For a size or compound outside the standard catalog, APG can quote from a print or sample.