8-360 BLACK BUNA 90D BACK-UP RING

HB90360 is an AS568-360 black Buna-N (Nitrile) 90 Shore A Back-Up Ring built to an inside diameter of 5.85 in (148.59 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 6.27 in (159.26 mm). In service, this back-up ring bridges the extrusion gap so the primary seal holds its shape under load.

Buna-N (Nitrile) delivers an economical choice for high-volume maintenance programs, reliable performance in both static and dynamic service. The material holds up against greases and lubricants, water, and petroleum-based oils. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with strong acids or ketones.

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

Reference part number HB90360 when ordering; the item is sold individually. Unit weight is approximately 5.036 g and nominal inside diameter is listed as 5 7/8 inch. Check the compound against your process media, pressure and temperature before committing to a design. For a size or compound outside the standard catalog, APG can quote from a print or sample.