Q-335 BUNA 70 Q RING

Ordered as QH70335, this is an AS568-335 black Buna-N (Nitrile) 70 Shore A Quad-Ring measuring an inside diameter of 2.725 in (69.22 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 3.145 in (79.88 mm). The quad-ring delivers lower friction and better sealing stability than a comparable round-section o-ring.

Expect good resistance to hydraulic fluids, many alcohols, and petroleum-based oils. Buna-N (Nitrile) is widely chosen for reliable performance in both static and dynamic service, an economical choice for high-volume maintenance programs. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in polar solvents or automotive brake fluid. The profile itself contributes resistance to the spiral twisting that defeats round-section rings and two sealing bands per contact face rather than one.

Maintenance and OEM teams specify it across hydraulic and pneumatic systems, construction equipment, and general industrial maintenance.

QH70335 ships individually. Unit weight is approximately 6.7 g and nominal inside diameter is listed as 2 3/4 inch. Check the compound against your process media, pressure and temperature before committing to a design. For a size or compound outside the standard catalog, APG can quote from a print or sample.