8-335 BLACK FKM 90D BACK-UP RING

This back-up ring is supplied in AS568-335 black Viton® (FKM) 90 Shore A built to an inside diameter of 2.725 in (69.22 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 3.145 in (79.88 mm), catalogued under part number VBU90335. It bridges the extrusion gap so the primary seal holds its shape under load.

The compound resists aromatic hydrocarbons, aggressive chemicals, and engine and transmission fluids. Viton® (FKM) is widely chosen for outstanding high-temperature capability and very low compression set at elevated temperature. The material carries a published service range of -15°F (-26.1°C) to 400°F (204.4°C). Verify compatibility before use with amines or low-molecular-weight organic acids.

You will find this material specified across aerospace, semiconductor equipment, and oil and gas.

Stocked as VBU90335 and sold individually. Unit weight is approximately 3.314 g and nominal inside diameter is listed as 2 3/4 inch. Review your operating media and conditions against this specification before installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.