4204-514AD MINNESOTA RUBBER QUAD RING

This quad-ring is supplied in AS568-204 black Viton® (FKM) 75 Shore A quad profile built to an inside diameter of 0.359 in (9.12 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 0.637 in (16.18 mm), catalogued under part number VQ4204. It seats in a standard o-ring gland while offering improved dynamic performance.

Expect good resistance to engine and transmission fluids, chlorinated solvents, and aromatic hydrocarbons. That behavior comes from the compound itself: Viton® (FKM) is specified for very low compression set at elevated temperature and the industry benchmark where nitrile reaches its thermal limit. The material carries a published service range of -15°F (-26.1°C) to 400°F (204.4°C). It should not be specified for service in hot water and steam or low-molecular-weight organic acids.

Common environments for this compound include chemical processing, semiconductor equipment, and oil and gas.

Stocked as VQ4204 and sold individually. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.