Q-366 BUNA 70 Q RING

The QH70366 is an AS568-366 black Buna-N (Nitrile) 70 Shore A quad profile Quad-Ring built to an inside diameter of 7.225 in (183.52 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 7.645 in (194.18 mm). This quad-ring uses a four-lobed profile to create two sealing surfaces per side, reducing the squeeze needed to seal.

Buna-N (Nitrile) offers an economical choice for high-volume maintenance programs, reliable performance in both static and dynamic service. It resists many alcohols, water, and petroleum-based oils. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Applications involving automotive brake fluid or strong acids call for a different compound.

Maintenance and OEM teams specify it across automotive, construction equipment, and general industrial maintenance.

Reference part number QH70366 when ordering; the item is sold individually. Unit weight is approximately 16.115 g and nominal inside diameter is listed as 7 1/4 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. For a size or compound outside the standard catalog, APG can quote from a print or sample.