Q-439 BUNA 70 Q RING

The QH70439 is an AS568-439 black Buna-N (Nitrile) 70 Shore A Quad-Ring built to an inside diameter of 6.475 in (164.47 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 7.025 in (178.44 mm). This 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. That behavior comes from the compound itself: Buna-N (Nitrile) is valued for the most widely specified general-purpose sealing elastomer, reliable performance in both static and dynamic service. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). The profile itself contributes resistance to the spiral twisting that defeats round-section rings and lower compressive load required to achieve a seal.

You will find this material specified across fluid power, automotive, and construction equipment.

QH70439 ships individually. Unit weight is approximately 27.56 g. Check the compound against your process media, pressure and temperature before committing to a design.