Q-437 BUNA 70 Q RING

QH70437 is an AS568-437 black Buna-N (Nitrile) 70 Shore A Quad-Ring built to an inside diameter of 5.975 in (151.77 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 6.525 in (165.74 mm). In service, this quad-ring resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

Buna-N (Nitrile) offers low compression set under sustained load, reliable performance in both static and dynamic service. The compound resists greases and lubricants, hydraulic fluids, and petroleum-based oils. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Applications involving polar solvents or ozone and direct sunlight call for a different compound. The profile itself contributes a parting line located away from the sealing surface and resistance to the spiral twisting that defeats round-section rings.

Maintenance and OEM teams specify it across hydraulic and pneumatic systems, fluid power, and automotive.

Stocked as QH70437 and sold individually. Unit weight is approximately 23.345 g and nominal inside diameter is listed as 6 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.