Q-345 BUNA 70 Q RING

QH70345 is an AS568-345 black Buna-N (Nitrile) 70 Shore A Quad-Ring with an inside diameter of 3.975 in (100.97 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 4.395 in (111.63 mm). In service, this quad-ring provides a dual sealing band on each contact face for improved reliability.

Buna-N (Nitrile) delivers low compression set under sustained load, reliable performance in both static and dynamic service. This material stands up to water, petroleum-based oils, and hydraulic fluids. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with strong acids or ketones. The profile itself contributes lower compressive load required to achieve a seal and two sealing bands per contact face rather than one.

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

Reference part number QH70345 when ordering; the item is sold individually. Unit weight is approximately 9.73 g and nominal inside diameter is listed as 4 inch. Check the compound against your process media, pressure and temperature before committing to a design. For a size or compound outside the standard catalog, APG can quote from a print or sample.