4425-366Y MINNESOTA RUBBER QUAD RING

APG stocks the HQ4425, an AS568-425 black Buna-N (Nitrile) 70 Shore A quad profile Quad-Ring built to an inside diameter of 4.475 in (113.67 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 5.025 in (127.64 mm). A quad-ring delivers lower friction and better sealing stability than a comparable round-section o-ring.

This material stands up to greases and lubricants, petroleum-based oils, and water. That behavior comes from the compound itself: Buna-N (Nitrile) delivers low compression set under sustained load 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). Applications involving strong acids or ozone and direct sunlight call for a different compound.

Typical settings include agricultural equipment, general industrial maintenance, and hydraulic and pneumatic systems.

Reference part number HQ4425 when ordering; the item is sold individually. Nominal inside diameter is listed as 4 1/2. Check the compound against your process media, pressure and temperature before committing to a design. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.