8-124 BLACK BUNA 90D BACK-UP RING

Part number HB90124 is an AS568-124 black Buna-N (Nitrile) 90 Shore A Back-Up Ring measuring an inside diameter of 1.237 in (31.42 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 1.443 in (36.65 mm). A back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.

Buna-N (Nitrile) is specified here for most widely specified general-purpose sealing elastomer, reliable performance in both static and dynamic service. Expect good resistance to greases and lubricants, water, and hydraulic fluids. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). It is not the right choice where ketones or polar solvents are present.

Maintenance and OEM teams specify it across agricultural equipment, construction equipment, and hydraulic and pneumatic systems.

Stocked as HB90124 and sold individually. Unit weight is approximately 0.376 g and nominal inside diameter is listed as 1 1/4 inch. Review your operating media and conditions against this specification before installation.