4210-366Y MINNESOTA RUBBER QUAD RING

This quad-ring is supplied in AS568-210 black Buna-N (Nitrile) 70 Shore A with an inside diameter of 0.734 in (18.64 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 1.012 in (25.7 mm), catalogued under part number HQ4210. It provides a dual sealing band on each contact face for improved reliability.

Buna-N (Nitrile) is widely chosen for the most widely specified general-purpose sealing elastomer, reliable performance in both static and dynamic service. This material stands up to petroleum-based oils, water, and hydraulic fluids. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Applications involving ozone and direct sunlight or strong acids call for a different compound. The profile itself contributes lower compressive load required to achieve a seal and resistance to the spiral twisting that defeats round-section rings.

Maintenance and OEM teams specify it across agricultural equipment, automotive, and fluid power.

Order part number HQ4210, sold individually. Nominal inside diameter is listed as 3/4 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.