4142-366Y MINNESOTA RUBBER QUAD RING

Part number HQ4142 is an AS568-142 black Buna-N (Nitrile) 70 Shore A 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. The profile itself contributes a parting line located away from the sealing surface and resistance to the spiral twisting that defeats round-section rings.

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.