568-309 BUNA 70 SQUARE CUT RINGS

This quad-ring is supplied in AS568-309 black Buna-N (Nitrile) 70 Shore A square profile supplied with an inside diameter of 0.412 in (10.46 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 0.832 in (21.13 mm), catalogued under part number SH70309. It resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

The compound resists many alcohols, water, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for an economical choice for high-volume maintenance programs and the most widely specified general-purpose sealing elastomer. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in ketones or automotive brake fluid.

You will find this material specified across agricultural equipment, construction equipment, and general industrial maintenance.

This item is sold individually under part number SH70309. Nominal inside diameter is listed as 7/16 inch. Check the compound against your process media, pressure and temperature before committing to a design.