Q-241 BUNA 70 Q RING

Part number QH70241 is an AS568-241 black Buna-N (Nitrile) 70 Shore A Quad-Ring measuring an inside diameter of 3.859 in (98.02 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 4.137 in (105.08 mm). A quad-ring uses a four-lobed profile to create two sealing surfaces per side, reducing the squeeze needed to seal.

The material holds up against greases and lubricants, petroleum-based oils, and water. Buna-N (Nitrile) is specified for low compression set under sustained load, reliable performance in both static and dynamic service. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with ketones or polar solvents. The profile itself contributes a parting line located away from the sealing surface and resistance to the spiral twisting that defeats round-section rings.

Common environments for this compound include hydraulic and pneumatic systems, automotive, and construction equipment.

Reference part number QH70241 when ordering; the item is sold individually. Unit weight is approximately 4.12 g and nominal inside diameter is listed as 3 7/8 inch. Check the compound against your process media, pressure and temperature before committing to a design. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.