Q-426 BUNA 70 Q RING

Part number QH70426 is an AS568-426 black Buna-N (Nitrile) 70 Shore A Quad-Ring with an inside diameter of 4.6 in (116.84 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 5.15 in (130.81 mm). A quad-ring uses a four-lobed profile to create two sealing surfaces per side, reducing the squeeze needed to seal.

Buna-N (Nitrile) is known for an economical choice for high-volume maintenance programs, strong abrasion and tear resistance. It resists hydraulic fluids, petroleum-based oils, and many alcohols. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with automotive brake fluid or strong acids. The profile itself contributes two sealing bands per contact face rather than one and resistance to the spiral twisting that defeats round-section rings.

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

Reference part number QH70426 when ordering; the item is sold individually. Unit weight is approximately 20.54 g and nominal inside diameter is listed as 4 5/8 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.