Q-140 BUNA 70 Q RING

Part number QH70140 is an AS568-140 black Buna-N (Nitrile) 70 Shore A Quad-Ring supplied with an inside diameter of 2.237 in (56.82 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.443 in (62.05 mm). A quad-ring delivers lower friction and better sealing stability than a comparable round-section o-ring.

Expect good resistance to petroleum-based oils, water, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) delivers strong abrasion and tear resistance, reliable performance in both static and dynamic service. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Verify compatibility before use with polar solvents or ketones. The profile itself contributes lower compressive load required to achieve a seal and resistance to the spiral twisting that defeats round-section rings.

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

This item is sold individually under part number QH70140. Unit weight is approximately 1.1908 g and nominal inside diameter is listed as 2 1/4 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.