568-268 BUNA 70 SQUARE CUT RINGS

APG stocks the SH70268, an AS568-268 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring supplied with an inside diameter of 8.484 in (215.49 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 8.762 in (222.55 mm). A square-cut ring provides an economical lathe-cut alternative where a moulded o-ring is not required.

Buna-N (Nitrile) is valued for the most widely specified general-purpose sealing elastomer, reliable performance in both static and dynamic service. The material holds up against water, petroleum-based oils, and many alcohols. 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.

Maintenance and OEM teams specify it across hydraulic and pneumatic systems, automotive, and construction equipment.

Order part number SH70268, sold individually. Unit weight is approximately 8.297 g and nominal inside diameter is listed as 8 1/2 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. For a size or compound outside the standard catalog, APG can quote from a print or sample.