Q-375 BUNA 70 Q RING

This quad-ring is supplied in AS568-375 black Buna-N (Nitrile) 70 Shore A supplied with an inside diameter of 9.475 in (240.67 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 9.895 in (251.33 mm), catalogued under part number QH70375. It uses a four-lobed profile to create two sealing surfaces per side, reducing the squeeze needed to seal.

It resists greases and lubricants, propane and butane, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) is specified for an economical choice for high-volume maintenance programs and the most widely specified general-purpose sealing elastomer. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in polar solvents or ozone and direct sunlight. The profile itself contributes lower compressive load required to achieve a seal and two sealing bands per contact face rather than one.

Maintenance and OEM teams specify it across agricultural equipment, general industrial maintenance, and hydraulic and pneumatic systems.

This item is sold individually under part number QH70375. Unit weight is approximately 21.008 g and nominal inside diameter is listed as 9 1/2 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.