Q-438 FLUOROELASTOMER 75 Q RING

This quad-ring is supplied in AS568-438 black Viton® (FKM) 75 Shore A with an inside diameter of 6.225 in (158.12 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 6.775 in (172.09 mm), catalogued under part number QV70438. It resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

As a material, Viton® (FKM) is specified for outstanding high-temperature capability, excellent resistance to compression set and permeation. The compound resists petroleum oils and fuels, engine and transmission fluids, and aggressive chemicals. The material carries a published service range of -15°F (-26.1°C) to 400°F (204.4°C). Exposure to amines or ketones and esters will shorten service life. The profile itself contributes a parting line located away from the sealing surface and resistance to the spiral twisting that defeats round-section rings.

It sees regular use in aerospace, chemical processing, and automotive fuel systems.

QV70438 ships individually. Unit weight is approximately 38.916 g and nominal inside diameter is listed as 6 1/4 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.