**4025-366Y MINNESOTA RUBBERQUAD RING

Ordered as HQ4025, this is an AS568-025 black Buna-N (Nitrile) 70 Shore A Quad-Ring with an inside diameter of 0.176 in (4.47 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 1.316 in (33.43 mm). The quad-ring delivers lower friction and better sealing stability than a comparable round-section o-ring.

Expect good resistance to propane and butane, greases and lubricants, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) delivers strong abrasion and tear resistance, the most widely specified general-purpose sealing elastomer. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where polar solvents or automotive brake fluid are present. The profile itself contributes a parting line located away from the sealing surface and lower compressive load required to achieve a seal.

You will find this material specified across construction equipment, automotive, and hydraulic and pneumatic systems.

This item is sold individually under part number HQ4025. Application requirements vary, so validate compatibility with your process conditions prior to installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.