Q-329 BUNA 70 Q RING

Part number QH70329 is an AS568-329 black Buna-N (Nitrile) 70 Shore A quad profile Quad-Ring with an inside diameter of 1.975 in (50.17 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 2.395 in (60.83 mm). A quad-ring provides a dual sealing band on each contact face for improved reliability.

The compound resists water, propane and butane, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) is valued for low compression set under sustained load, reliable performance in both static and dynamic service. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Exposure to ketones or polar solvents will shorten service life.

You will find this material specified across hydraulic and pneumatic systems, automotive, and agricultural equipment.

Order part number QH70329, sold individually. Unit weight is approximately 5.076 g and nominal inside diameter is listed as 2 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.