Q-219 BUNA 70 Q RING

QH70219 is an AS568-219 black Buna-N (Nitrile) 70 Shore A Quad-Ring measuring an inside diameter of 1.296 in (32.92 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 1.574 in (39.98 mm). In service, this quad-ring delivers lower friction and better sealing stability than a comparable round-section o-ring.

Buna-N (Nitrile) is known for reliable performance in both static and dynamic service, low compression set under sustained load. The compound resists many alcohols, hydraulic fluids, and water. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Exposure to ketones or polar solvents will shorten service life. 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 hydraulic and pneumatic systems, agricultural equipment, and general industrial maintenance.

Order part number QH70219, sold individually. Unit weight is approximately 0.003 g and nominal inside diameter is listed as 1 5/16 inch. Review your operating media and conditions against this specification before installation. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.