568-105 BUNA 70 SQUARE CUT RINGS

Part number SH70105 is an AS568-105 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring measuring an inside diameter of 0.143 in (3.63 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 0.349 in (8.86 mm). A square-cut ring resists the spiral failure that affects round rings on long reciprocating strokes.

It resists water, greases and lubricants, and hydraulic fluids. Buna-N (Nitrile) is known for the most widely specified general-purpose sealing elastomer and an economical choice for high-volume maintenance programs. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Applications involving polar solvents or ketones call for a different compound. The profile itself contributes a flat contact band that spreads sealing load across a wider area 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.

You will find this material specified across hydraulic and pneumatic systems, agricultural equipment, and construction equipment.

This item is sold individually under part number SH70105. Nominal inside diameter is listed as 5/32 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.