*4276-366Y MINNESOTA RUBBER QUAD RING

Ordered as HQ4276, this is an AS568-276 black Buna-N (Nitrile) 70 Shore A Quad-Ring measuring an inside diameter of 10.984 in (278.99 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 11.262 in (286.05 mm). The quad-ring resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

Buna-N (Nitrile) is known for the most widely specified general-purpose sealing elastomer and low compression set under sustained load. The compound resists hydraulic fluids, petroleum-based oils, and propane and butane. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Applications involving strong acids or automotive brake fluid call for a different compound. The profile itself contributes two sealing bands per contact face rather than one and resistance to the spiral twisting that defeats round-section rings.

Common environments for this compound include agricultural equipment, automotive, and fluid power.

Order part number HQ4276, sold individually. Nominal inside diameter is listed as 11 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. For a size or compound outside the standard catalog, APG can quote from a print or sample.