4003-366Y MINNESOTA RUBBER QUAD RING

The HQ4003 is an AS568-003 black Buna-N (Nitrile) 70 Shore A Quad-Ring measuring an inside diameter of 0.056 in (1.42 mm), a cross section of 0.06 in (1.52 mm), and an outside diameter of 0.176 in (4.47 mm). This quad-ring resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

This material stands up to propane and butane, hydraulic fluids, and many alcohols. Buna-N (Nitrile) is specified for reliable performance in both static and dynamic service, an economical choice for high-volume maintenance programs. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Applications involving automotive brake fluid or ketones 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.

Typical settings include general industrial maintenance, agricultural equipment, and construction equipment.

Stocked as HQ4003 and sold individually. Review your operating media and conditions against this specification before installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.