**4155-366Y MINNESOTA RUBBER QUAD RING

Part number HQ4155 is an AS568-155 black Buna-N (Nitrile) 70 Shore A Quad-Ring measuring an inside diameter of 3.987 in (101.27 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 4.193 in (106.5 mm). A quad-ring provides a dual sealing band on each contact face for improved reliability.

The material holds up against greases and lubricants, many alcohols, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) offers strong abrasion and tear resistance, the most widely specified general-purpose sealing elastomer. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Applications involving ozone and direct sunlight or polar solvents call for a different compound. The profile itself contributes two sealing bands per contact face rather than one and resistance to the spiral twisting that defeats round-section rings.

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

HQ4155 ships individually. Review your operating media and conditions against this specification before installation.