Q-281 BUNA 70 Q RING

Ordered as QH70281, this is an AS568-281 black Buna-N (Nitrile) 70 Shore A Quad-Ring built to an inside diameter of 14.984 in (380.59 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 15.262 in (387.65 mm). The quad-ring provides a dual sealing band on each contact face for improved reliability.

It resists many alcohols, propane and butane, and hydraulic fluids. Buna-N (Nitrile) offers an economical choice for high-volume maintenance programs and low compression set under sustained load. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Applications involving polar solvents or ozone and direct sunlight call for a different compound. 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 automotive, general industrial maintenance, and fluid power.

This item is sold individually under part number QH70281. Nominal inside diameter is listed as 15 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.