4328-366Y MINNESOTA RUBBER QUAD RING

Part number HQ4328 is an AS568-328 black Buna-N (Nitrile) 70 Shore A Quad-Ring supplied with an inside diameter of 1.85 in (46.99 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 2.27 in (57.66 mm). A quad-ring provides a dual sealing band on each contact face for improved reliability.

This material stands up to water, greases and lubricants, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for reliable performance in both static and dynamic service, strong abrasion and tear resistance. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where strong acids or ketones are present. The profile itself contributes lower compressive load required to achieve a seal and two sealing bands per contact face rather than one.

You will find this material specified across general industrial maintenance, fluid power, and agricultural equipment.

HQ4328 ships individually. As always, verify media compatibility and operating conditions against the requirements of your specific application. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.