Q-338 BUNA 70 Q RING

Ordered as QH70338, this is an AS568-338 black Buna-N (Nitrile) 70 Shore A Quad-Ring built to an inside diameter of 3.1 in (78.74 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 3.52 in (89.41 mm). The quad-ring resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

Buna-N (Nitrile) is known for an economical choice for high-volume maintenance programs, strong abrasion and tear resistance. The compound resists many alcohols, hydraulic fluids, and water. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where automotive brake fluid or ketones are present. The profile itself contributes a parting line located away from the sealing surface and lower compressive load required to achieve a seal.

Typical settings include general industrial maintenance, fluid power, and agricultural equipment.

QH70338 ships individually. Unit weight is approximately 7.78 g. Review your operating media and conditions against this specification before installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.