Q-259 BUNA 70 Q RING

The QH70259 is an AS568-259 black Buna-N (Nitrile) 70 Shore A Quad-Ring with an inside diameter of 6.234 in (158.34 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 6.512 in (165.4 mm). This quad-ring seats in a standard o-ring gland while offering improved dynamic performance.

Expect good resistance to petroleum-based oils, hydraulic fluids, and propane and butane. Buna-N (Nitrile) is widely chosen for the most widely specified general-purpose sealing elastomer and 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). The profile itself contributes a parting line located away from the sealing surface and resistance to the spiral twisting that defeats round-section rings.

Common environments for this compound include hydraulic and pneumatic systems, general industrial maintenance, and automotive.

Stocked as QH70259 and sold individually. Unit weight is approximately 6.484 g and nominal inside diameter is listed as 6 1/4 inch. Review your operating media and conditions against this specification before installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.