*4212-514AD MINNESOTA RUBBER QUAD RING

This quad-ring is supplied in AS568-212 black Viton® (FKM) 75 Shore A quad profile measuring an inside diameter of 0.859 in (21.82 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 1.137 in (28.88 mm), catalogued under part number VQ4212. It delivers lower friction and better sealing stability than a comparable round-section o-ring.

Expect good resistance to aromatic hydrocarbons, petroleum oils and fuels, and many acids. That behavior comes from the compound itself: Viton® (FKM) is known for the industry benchmark where nitrile reaches its thermal limit and outstanding high-temperature capability. Service temperature is rated from -15°F (-26.1°C) through 400°F (204.4°C). Applications involving amines or ketones and esters call for a different compound.

Common environments for this compound include oil and gas, semiconductor equipment, and automotive fuel systems.

VQ4212 ships individually. Nominal inside diameter is listed as 7/8 inch. Check the compound against your process media, pressure and temperature before committing to a design. For a size or compound outside the standard catalog, APG can quote from a print or sample.