8-170 BLACK BUNA 90D BACK-UP RING

Part number HB90170 is an AS568-170 black Buna-N (Nitrile) 90 Shore A Back-Up Ring supplied with an inside diameter of 7.737 in (196.52 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 7.943 in (201.75 mm). A back-up ring bridges the extrusion gap so the primary seal holds its shape under load.

The compound resists hydraulic fluids, water, and propane and butane. Buna-N (Nitrile) is known for strong abrasion and tear resistance, an economical choice for high-volume maintenance programs. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with polar solvents or ozone and direct sunlight.

Common environments for this compound include hydraulic and pneumatic systems, fluid power, and agricultural equipment.

Order part number HB90170, sold individually. Unit weight is approximately 2.202 g. Application requirements vary, so validate compatibility with your process conditions prior to installation.