*Q-355 FLUOROELASTOMER 75 Q RING

This quad-ring is supplied in AS568-355 black Viton® (FKM) 75 Shore A with an inside diameter of 5.225 in (132.72 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 5.645 in (143.38 mm), catalogued under part number QV70355. It resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

The compound resists engine and transmission fluids, aromatic hydrocarbons, and aggressive chemicals. That behavior comes from the compound itself: Viton® (FKM) offers long service life in hot, chemically aggressive environments and very low compression set at elevated temperature. Service temperature is rated from -15°F (-26.1°C) through 400°F (204.4°C). Applications involving ketones and esters or amines call for a different compound. The profile itself contributes two sealing bands per contact face rather than one and resistance to the spiral twisting that defeats round-section rings.

Common environments for this compound include aerospace, oil and gas, and high-temperature process equipment.

Stocked as QV70355 and sold individually. Unit weight is approximately 19.684 g and nominal inside diameter is listed as 5 1/4 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. 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.