Q-357 FLUOROELASTOMER 75 Q RING

APG stocks the QV70357, an AS568-357 black Viton® (FKM) 75 Shore A Quad-Ring supplied with an inside diameter of 5.475 in (139.07 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 5.895 in (149.73 mm). A quad-ring delivers lower friction and better sealing stability than a comparable round-section o-ring.

Viton® (FKM) is specified here for excellent resistance to compression set and permeation, very low compression set at elevated temperature. The material holds up against chlorinated solvents, aromatic hydrocarbons, and engine and transmission fluids. Published continuous service range is -15°F (-26.1°C) to 400°F (204.4°C). Applications involving low-molecular-weight organic acids or amines call for a different compound. The profile itself contributes lower compressive load required to achieve a seal and resistance to the spiral twisting that defeats round-section rings.

Maintenance and OEM teams specify it across chemical processing, aerospace, and oil and gas.

Reference part number QV70357 when ordering; the item is sold individually. Unit weight is approximately 20.214 g and nominal inside diameter is listed as 5 1/2 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.