*4278-366Y MINNESOTA RUBBER QUAD RING

The HQ4278 is an AS568-278 black Buna-N (Nitrile) 70 Shore A quad profile Quad-Ring with an inside diameter of 11.984 in (304.39 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 12.262 in (311.45 mm). This quad-ring provides a dual sealing band on each contact face for improved reliability.

Buna-N (Nitrile) is widely chosen for reliable performance in both static and dynamic service, an economical choice for high-volume maintenance programs. It resists hydraulic fluids, greases and lubricants, and petroleum-based oils. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Exposure to strong acids or polar solvents will shorten service life.

Maintenance and OEM teams specify it across general industrial maintenance, agricultural equipment, and construction equipment.

Reference part number HQ4278 when ordering; the item is sold individually. Application requirements vary, so validate compatibility with your process conditions prior to installation.