8-364 BLACK BUNA 90D BACK-UP RING

The HB90364 is an AS568-364 black Buna-N (Nitrile) 90 Shore A Back-Up Ring built to an inside diameter of 6.725 in (170.82 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 7.145 in (181.48 mm). This back-up ring bridges the extrusion gap so the primary seal holds its shape under load.

As a material, Buna-N (Nitrile) delivers an economical choice for high-volume maintenance programs, strong abrasion and tear resistance. The material holds up against greases and lubricants, many alcohols, and hydraulic fluids. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with ketones or polar solvents.

Common environments for this compound include automotive, fluid power, and agricultural equipment.

Reference part number HB90364 when ordering; the item is sold individually. Unit weight is approximately 5.8304 g. Review your operating media and conditions against this specification before installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.