8-137 BLACK FKM 90D BACK-UP RING

Part number VBU90137 is an AS568-137 black Viton® (FKM) 90 Shore A Back-Up Ring supplied with an inside diameter of 2.05 in (52.07 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.256 in (57.3 mm). A back-up ring bridges the extrusion gap so the primary seal holds its shape under load.

As a material, Viton® (FKM) is widely chosen for the industry benchmark where nitrile reaches its thermal limit and outstanding high-temperature capability. The compound resists aromatic hydrocarbons, aggressive chemicals, and chlorinated solvents. Service temperature is rated from -15°F (-26.1°C) through 400°F (204.4°C). Applications involving hot water and steam or ketones and esters call for a different compound.

Typical settings include aerospace, oil and gas, and semiconductor equipment.

This item is sold individually under part number VBU90137. Unit weight is approximately 0.8259 g. Application requirements vary, so validate compatibility with your process conditions prior to installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.