Q-148 BUNA 70 Q RING

APG stocks the QH70148, an AS568-148 black Buna-N (Nitrile) 70 Shore A Quad-Ring supplied with an inside diameter of 2.737 in (69.52 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.943 in (74.75 mm). A quad-ring resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

Expect good resistance to propane and butane, water, and hydraulic fluids. Buna-N (Nitrile) is valued for the most widely specified general-purpose sealing elastomer and an economical choice for high-volume maintenance programs. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). The profile itself contributes resistance to the spiral twisting that defeats round-section rings and two sealing bands per contact face rather than one.

Common environments for this compound include general industrial maintenance, automotive, and construction equipment.

Stocked as QH70148 and sold individually. Unit weight is approximately 1.433 g and nominal inside diameter is listed as 2 3/4 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.