Q-349 BUNA 70 Q RING

APG stocks the QH70349, an AS568-349 black Buna-N (Nitrile) 70 Shore A Quad-Ring supplied with an inside diameter of 4.475 in (113.67 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 4.895 in (124.33 mm). A quad-ring provides a dual sealing band on each contact face for improved reliability.

This material stands up to greases and lubricants, many alcohols, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) offers an economical choice for high-volume maintenance programs, strong abrasion and tear resistance. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Exposure to strong acids or automotive brake fluid 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.

You will find this material specified across hydraulic and pneumatic systems, fluid power, and general industrial maintenance.

This item is sold individually under part number QH70349. Unit weight is approximately 9.6694 g. Check the compound against your process media, pressure and temperature before committing to a design. For a size or compound outside the standard catalog, APG can quote from a print or sample.