*4255-366Y MINNESOTA RUBBER QUAD RING

This quad-ring is supplied in AS568-255 black Buna-N (Nitrile) 70 Shore A with an inside diameter of 5.609 in (142.47 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.887 in (149.53 mm), catalogued under part number HQ4255. It uses a four-lobed profile to create two sealing surfaces per side, reducing the squeeze needed to seal.

It resists greases and lubricants, propane and butane, and hydraulic fluids. Buna-N (Nitrile) offers strong abrasion and tear resistance, low compression set under sustained load. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. It should not be specified for service in strong acids or automotive brake fluid. The profile itself contributes lower compressive load required to achieve a seal and a parting line located away from the sealing surface.

Typical settings include hydraulic and pneumatic systems, general industrial maintenance, and fluid power.

This item is sold individually under part number HQ4255. Nominal inside diameter is listed as 5 5/8 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.