8-334 BLACK BUNA 90D BACK-UP RING

The HB90334 is an AS568-334 black Buna-N (Nitrile) 90 Shore A Back-Up Ring built to an inside diameter of 2.6 in (66.04 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 3.02 in (76.71 mm). This back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.

As a material, Buna-N (Nitrile) is known for an economical choice for high-volume maintenance programs and low compression set under sustained load. It resists greases and lubricants, water, and petroleum-based oils. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Verify compatibility before use with ketones or strong acids.

You will find this material specified across agricultural equipment, construction equipment, and automotive.

This item is sold individually under part number HB90334. Unit weight is approximately 2.3568 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.