4339-366Y MINNESOTA RUBBER QUAD RING

APG stocks the HQ4339, an AS568-339 black Buna-N (Nitrile) 70 Shore A quad profile Quad-Ring supplied with an inside diameter of 3.225 in (81.92 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 3.645 in (92.58 mm). A quad-ring resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

Expect good resistance to hydraulic fluids, greases and lubricants, and water. Buna-N (Nitrile) is known for low compression set under sustained load, reliable performance in both static and dynamic service. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where strong acids or ozone and direct sunlight are present.

It sees regular use in general industrial maintenance, automotive, and agricultural equipment.

Reference part number HQ4339 when ordering; the item is 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.