4142-366Y MINNESOTA RUBBER QUAD RING

Part number HQ4142 is an AS568-142 black Buna-N (Nitrile) 70 Shore A quad profile Quad-Ring measuring an inside diameter of 2.362 in (59.99 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.568 in (65.23 mm). A quad-ring delivers lower friction and better sealing stability than a comparable round-section o-ring.

It resists hydraulic fluids, water, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) delivers strong abrasion and tear resistance, low compression set under sustained load. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Exposure to strong acids or automotive brake fluid will shorten service life.

It sees regular use in hydraulic and pneumatic systems, construction equipment, and fluid power.

Reference part number HQ4142 when ordering; the item is sold individually. Nominal inside diameter is listed as 2 3/8. As always, verify media compatibility and operating conditions against the requirements of your specific application. For a size or compound outside the standard catalog, APG can quote from a print or sample.