*4128-366Y MINNESOTA RUBBER QUAD RING

The HQ4128 is an AS568-128 black Buna-N (Nitrile) 70 Shore A quad profile Quad-Ring with an inside diameter of 1.487 in (37.77 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 1.693 in (43 mm). This quad-ring uses a four-lobed profile to create two sealing surfaces per side, reducing the squeeze needed to seal.

The material holds up against greases and lubricants, hydraulic fluids, and petroleum-based oils. Buna-N (Nitrile) offers low compression set under sustained load, reliable performance in both static and dynamic service. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C).

You will find this material specified across construction equipment, fluid power, and automotive.

Order part number HQ4128, sold individually. Nominal inside diameter is listed as 1 1/2 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.