8-271 BLACK BUNA 90D BACK-UP RING

This back-up ring is supplied in AS568-271 black Buna-N (Nitrile) 90 Shore A built to an inside diameter of 9.234 in (234.54 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 9.512 in (241.6 mm), catalogued under part number HB90271. It extends o-ring service life by supporting the seal against extrusion under high pressure.

Buna-N (Nitrile) is specified here for low compression set under sustained load and economical choice for high-volume maintenance programs. This material stands up to greases and lubricants, water, and hydraulic fluids. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Verify compatibility before use with polar solvents or ozone and direct sunlight.

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

Order part number HB90271, sold individually. Unit weight is approximately 3.3921 g. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.