Q-108 BUNA 70 Q RING

APG stocks the QH70108, an AS568-108 black Buna-N (Nitrile) 70 Shore A Quad-Ring supplied with an inside diameter of 0.237 in (6.02 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 0.443 in (11.25 mm). A quad-ring seats in a standard o-ring gland while offering improved dynamic performance.

Expect good resistance to many alcohols, greases and lubricants, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) delivers an economical choice for high-volume maintenance programs, reliable performance in both static and dynamic service. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Applications involving strong acids or automotive brake fluid call for a different compound. The profile itself contributes resistance to the spiral twisting that defeats round-section rings and lower compressive load required to achieve a seal.

Common environments for this compound include fluid power, construction equipment, and automotive.

Stocked as QH70108 and sold individually. Unit weight is approximately 0.1746 g and nominal inside diameter is listed as 1/4 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.