*4003.5-366Y MINNESOTA RUBBER QUAD RING

This quad-ring is supplied in AS568-035 black Buna-N (Nitrile) 70 Shore A built to an inside diameter of 2.239 in (56.87 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 2.379 in (60.43 mm), catalogued under part number HQ40035. It resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

The compound resists hydraulic fluids, propane and butane, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) is valued for reliable performance in both static and dynamic service, low compression set under sustained load. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). The profile itself contributes resistance to the spiral twisting that defeats round-section rings and two sealing bands per contact face rather than one.

Maintenance and OEM teams specify it across automotive, construction equipment, and fluid power.

Reference part number HQ40035 when ordering; the item is sold individually. Nominal inside diameter is listed as 2 1/4 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.