8-456 BLACK BUNA 90D BACK-UP RING

Ordered as HB90456, this is an AS568-456 black Buna-N (Nitrile) 90 Shore A Back-Up Ring built to an inside diameter of 13.475 in (342.27 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 14.025 in (356.24 mm). The back-up ring bridges the extrusion gap so the primary seal holds its shape under load.

As a material, Buna-N (Nitrile) is valued for low compression set under sustained load and the most widely specified general-purpose sealing elastomer. Expect good resistance to many alcohols, water, and petroleum-based oils. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Exposure to ketones or ozone and direct sunlight will shorten service life.

Typical settings include construction equipment, fluid power, and automotive.

This item is sold individually under part number HB90456. Unit weight is approximately 24.0222 g. Application requirements vary, so validate compatibility with your process conditions prior to installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.