568-142 BUNA 70 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-142 black Buna-N (Nitrile) 70 Shore A supplied with an inside diameter of 2.362 in (59.99 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.568 in (65.23 mm), catalogued under part number SH70142. It resists the spiral failure that affects round rings on long reciprocating strokes.

It resists petroleum-based oils, water, and greases and lubricants. Buna-N (Nitrile) delivers strong abrasion and tear resistance, an economical choice for high-volume maintenance programs. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). The profile itself contributes greater resistance to extrusion than a round section of the same size and a rectangular section that will not roll in the groove. Note that a square section is less suited to high-speed rotary service, where the larger contact area raises friction and heat.

Common environments for this compound include hydraulic and pneumatic systems, automotive, and fluid power.

This item is sold individually under part number SH70142. Unit weight is approximately 1.543 g and nominal inside diameter is listed as 2 3/8 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. 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.