*4231-366Y MINNESOTA RUBBER QUAD RING

APG stocks the HQ4231, an AS568-231 black Buna-N (Nitrile) 70 Shore A Quad-Ring measuring an inside diameter of 2.609 in (66.27 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 2.887 in (73.33 mm). A quad-ring delivers lower friction and better sealing stability than a comparable round-section o-ring.

This material stands up to hydraulic fluids, petroleum-based oils, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for an economical choice for high-volume maintenance programs, reliable performance in both static and dynamic service. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. The profile itself contributes resistance to the spiral twisting that defeats round-section rings and a parting line located away from the sealing surface.

You will find this material specified across general industrial maintenance, automotive, and construction equipment.

Reference part number HQ4231 when ordering; the item is sold individually. Nominal inside diameter is listed as 2 5/8 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. 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.