Q-445 BUNA 70 Q RING

This quad-ring is supplied in AS568-445 black Buna-N (Nitrile) 70 Shore A with an inside diameter of 7.975 in (202.57 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 8.525 in (216.54 mm), catalogued under part number QH70445. It 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 specified for the most widely specified general-purpose sealing elastomer and an economical choice for high-volume maintenance programs. The material holds up against water, petroleum-based oils, and greases and lubricants. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where strong acids or ketones are present. The profile itself contributes two sealing bands per contact face rather than one and resistance to the spiral twisting that defeats round-section rings.

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

Order part number QH70445, sold individually. Unit weight is approximately 33.28 g and nominal inside diameter is listed as 8 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.