Q-328 BUNA 70 Q RING

Ordered as QH70328, this is an AS568-328 black Buna-N (Nitrile) 70 Shore A Quad-Ring measuring an inside diameter of 1.85 in (46.99 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 2.27 in (57.66 mm). The quad-ring resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

The compound resists greases and lubricants, many alcohols, and petroleum-based oils. Buna-N (Nitrile) offers low compression set under sustained load, reliable performance in both static and dynamic service. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). It is not the right choice where polar solvents or automotive brake fluid are present. The profile itself contributes resistance to the spiral twisting that defeats round-section rings and two sealing bands per contact face rather than one.

It sees regular use in general industrial maintenance, fluid power, and construction equipment.

Order part number QH70328, sold individually. Unit weight is approximately 4.537 g. Check the compound against your process media, pressure and temperature before committing to a design.