8-049 BLACK FKM 90D BACK-UP RING

This back-up ring is supplied in AS568-049 black Viton® (FKM) 90 Shore A built to an inside diameter of 4.989 in (126.72 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 5.129 in (130.28 mm), catalogued under part number VBU90049. It allows a standard o-ring to operate at higher pressures than it could unsupported.

It resists engine and transmission fluids, many acids, and chlorinated solvents. Viton® (FKM) is known for long service life in hot, chemically aggressive environments and outstanding high-temperature capability. Rated temperature range runs from -15°F (-26.1°C) to 400°F (204.4°C) in continuous service. It is not the right choice where ketones and esters or amines are present.

It sees regular use in aerospace, oil and gas, and automotive fuel systems.

Reference part number VBU90049 when ordering; the item is sold individually. 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.