**4275-366Y MINNESOTA RUBBER QUAD RING

APG stocks the HQ4275, an AS568-275 black Buna-N (Nitrile) 70 Shore A Quad-Ring built to an inside diameter of 10.484 in (266.29 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 10.762 in (273.35 mm). A quad-ring seats in a standard o-ring gland while offering improved dynamic performance.

It resists petroleum-based oils, water, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen 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). The profile itself contributes two sealing bands per contact face rather than one and lower compressive load required to achieve a seal.

Maintenance and OEM teams specify it across hydraulic and pneumatic systems, automotive, and fluid power.

Reference part number HQ4275 when ordering; the item is sold individually. Nominal inside diameter is listed as 10 1/2 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.