568-137 BUNA 70 SQUARE CUT RINGS

This quad-ring is supplied in AS568-137 black Buna-N (Nitrile) 70 Shore A square profile supplied with an inside diameter of 2.05 in (52.07 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.256 in (57.3 mm), catalogued under part number SH70137. It resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

The compound resists greases and lubricants, petroleum-based oils, and propane and butane. Buna-N (Nitrile) is widely chosen for low compression set under sustained load and the most widely specified general-purpose sealing elastomer. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Applications involving ketones or polar solvents call for a different compound.

It sees regular use in hydraulic and pneumatic systems, general industrial maintenance, and fluid power.

Stocked as SH70137 and sold individually. Unit weight is approximately 1.147 g and nominal inside diameter is listed as 2 1/16 inch. Check the compound against your process media, pressure and temperature before committing to a design.