4129-514AD MINNESOTA RUBBER QUAD RING

APG stocks the VQ4129, an AS568-129 black Viton® (FKM) 75 Shore A quad profile Quad-Ring measuring an inside diameter of 1.549 in (39.34 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 1.755 in (44.58 mm). A quad-ring delivers lower friction and better sealing stability than a comparable round-section o-ring.

This material stands up to chlorinated solvents, aromatic hydrocarbons, and petroleum oils and fuels. That behavior comes from the compound itself: Viton® (FKM) is known for the industry benchmark where nitrile reaches its thermal limit and long service life in hot, chemically aggressive environments. 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 amines or ketones and esters.

Maintenance and OEM teams specify it across oil and gas, aerospace, and automotive fuel systems.

Order part number VQ4129, sold individually. As always, verify media compatibility and operating conditions against the requirements of your specific application.