Q-212 BUNA 70 Q RING

Part number QH70212 is an AS568-212 black Buna-N (Nitrile) 70 Shore A Quad-Ring supplied with an inside diameter of 0.859 in (21.82 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 1.137 in (28.88 mm). A quad-ring resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

Buna-N (Nitrile) delivers strong abrasion and tear resistance, low compression set under sustained load. The compound resists hydraulic fluids, propane and butane, and greases and lubricants. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Exposure to strong acids or ketones 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 automotive, hydraulic and pneumatic systems, and agricultural equipment.

This item is sold individually under part number QH70212. Unit weight is approximately 0.9417 g and nominal inside diameter is listed as 7/8 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.