Q-321 BUNA 70 Q RING

QH70321 is an AS568-321 black Buna-N (Nitrile) 70 Shore A Quad-Ring with an inside diameter of 1.162 in (29.51 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 1.582 in (40.18 mm). In service, this quad-ring uses a four-lobed profile to create two sealing surfaces per side, reducing the squeeze needed to seal.

As a material, Buna-N (Nitrile) is known for low compression set under sustained load, strong abrasion and tear resistance. Expect good resistance to greases and lubricants, petroleum-based oils, and many alcohols. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Exposure to ozone and direct sunlight or strong acids 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.

It sees regular use in agricultural equipment, hydraulic and pneumatic systems, and general industrial maintenance.

Stocked as QH70321 and sold individually. Unit weight is approximately 3.1177 g and nominal inside diameter is listed as 1 3/16 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.