8-029 BLACK BUNA 90D BACK-UP RING

Ordered as HB90029, this is an AS568-029 black Buna-N (Nitrile) 90 Shore A Back-Up Ring supplied with an inside diameter of 1.489 in (37.82 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 1.629 in (41.38 mm). The back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.

Buna-N (Nitrile) is valued for the most widely specified general-purpose sealing elastomer and an economical choice for high-volume maintenance programs. Expect good resistance to petroleum-based oils, water, and many alcohols. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with strong acids or ozone and direct sunlight.

It sees regular use in agricultural equipment, fluid power, and hydraulic and pneumatic systems.

HB90029 ships individually. Unit weight is approximately 0.2694 g and nominal inside diameter is listed as 1 1/2 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.