Q-339 BUNA 70 Q RING

Part number QH70339 is an AS568-339 black Buna-N (Nitrile) 70 Shore A Quad-Ring measuring 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 delivers lower friction and better sealing stability than a comparable round-section o-ring.

Expect good resistance to many alcohols, petroleum-based oils, and water. Buna-N (Nitrile) delivers reliable performance in both static and dynamic service, the most widely specified general-purpose sealing elastomer. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Exposure to polar solvents or ketones will shorten service life. The profile itself contributes lower compressive load required to achieve a seal and a parting line located away from the sealing surface.

You will find this material specified across automotive, fluid power, and hydraulic and pneumatic systems.

Stocked as QH70339 and sold individually. Unit weight is approximately 7.992 g. Check the compound against your process media, pressure and temperature before committing to a design. 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.