Q-256 FLUOROELASTOMER 75 Q RING

Ordered as QV70256, this is an AS568-256 black Viton® (FKM) 75 Shore A Quad-Ring built to an inside diameter of 5.734 in (145.64 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 6.012 in (152.7 mm). The quad-ring uses a four-lobed profile to create two sealing surfaces per side, reducing the squeeze needed to seal.

As a material, Viton® (FKM) delivers excellent resistance to compression set and permeation, very low compression set at elevated temperature. It resists engine and transmission fluids, aromatic hydrocarbons, and petroleum oils and fuels. Published continuous service range is -15°F (-26.1°C) to 400°F (204.4°C). It is not the right choice where ketones and esters or amines are present. The profile itself contributes resistance to the spiral twisting that defeats round-section rings and lower compressive load required to achieve a seal.

You will find this material specified across automotive fuel systems, semiconductor equipment, and aerospace.

Stocked as QV70256 and sold individually. Unit weight is approximately 9.2025 g. Check the compound against your process media, pressure and temperature before committing to a design. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.