Q-264 BUNA 70 Q RING

APG stocks the QH70264, an AS568-264 black Buna-N (Nitrile) 70 Shore A Quad-Ring built to an inside diameter of 7.484 in (190.09 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 7.762 in (197.15 mm). A quad-ring uses a four-lobed profile to create two sealing surfaces per side, reducing the squeeze needed to seal.

It resists many alcohols, propane and butane, and water. That behavior comes from the compound itself: Buna-N (Nitrile) is known for reliable performance in both static and dynamic service, strong abrasion and tear resistance. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Exposure to polar solvents or ketones will shorten service life. The profile itself contributes two sealing bands per contact face rather than one and a parting line located away from the sealing surface.

Maintenance and OEM teams specify it across hydraulic and pneumatic systems, fluid power, and automotive.

Stocked as QH70264 and sold individually. Unit weight is approximately 7.0287 g and nominal inside diameter is listed as 7 1/2 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.