8-127 BLACK BUNA 90D BACK-UP RING

Ordered as HB90127, this is an AS568-127 black Buna-N (Nitrile) 90 Shore A Back-Up Ring with an inside diameter of 1.424 in (36.17 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 1.63 in (41.4 mm). The 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, most widely specified general-purpose sealing elastomer. Expect good resistance to hydraulic fluids, petroleum-based oils, and propane and butane. 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.

Maintenance and OEM teams specify it across general industrial maintenance, hydraulic and pneumatic systems, and agricultural equipment.

Order part number HB90127, sold individually. Unit weight is approximately 0.4519 g and nominal inside diameter is listed as 1 7/16 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.