Q-371 BUNA 70 Q RING

QH70371 is an AS568-371 black Buna-N (Nitrile) 70 Shore A quad profile Quad-Ring measuring an inside diameter of 8.475 in (215.27 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 8.895 in (225.93 mm). In service, this quad-ring delivers lower friction and better sealing stability than a comparable round-section o-ring.

The compound resists many alcohols, hydraulic fluids, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) delivers low compression set under sustained load, reliable performance in both static and dynamic service. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C).

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

Reference part number QH70371 when ordering; the item is sold individually. Unit weight is approximately 19.936 g. Application requirements vary, so validate compatibility with your process conditions prior to installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.