Q-278 BUNA 70 Q RING

APG stocks the QH70278, an AS568-278 black Buna-N (Nitrile) 70 Shore A Quad-Ring supplied with an inside diameter of 11.984 in (304.39 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 12.262 in (311.45 mm). A quad-ring provides a dual sealing band on each contact face for improved reliability.

Expect good resistance to propane and butane, hydraulic fluids, and many alcohols. Buna-N (Nitrile) is valued for reliable performance in both static and dynamic service, an economical choice for high-volume maintenance programs. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in automotive brake fluid or strong acids. The profile itself contributes lower compressive load required to achieve a seal and resistance to the spiral twisting that defeats round-section rings.

Typical settings include hydraulic and pneumatic systems, automotive, and general industrial maintenance.

Order part number QH70278, sold individually. Nominal inside diameter is listed as 12 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.