8-265 BLACK BUNA 90D BACK-UP RING

This back-up ring is supplied in AS568-265 black Buna-N (Nitrile) 90 Shore A with an inside diameter of 7.734 in (196.44 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 8.012 in (203.5 mm), catalogued under part number HB90265. It 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, low compression set under sustained load. This material stands up to hydraulic fluids, petroleum-based oils, and many alcohols. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Verify compatibility before use with strong acids or polar solvents.

It sees regular use in general industrial maintenance, hydraulic and pneumatic systems, and agricultural equipment.

HB90265 ships individually. Unit weight is approximately 2.8111 g. Application requirements vary, so validate compatibility with your process conditions prior to installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.