568-340 BUNA 70 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-340 black Buna-N (Nitrile) 70 Shore A measuring an inside diameter of 3.35 in (85.09 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 3.77 in (95.76 mm), catalogued under part number SH70340. It presents a flat rectangular section that cannot roll or twist in its groove, making it a dependable static seal.

Buna-N (Nitrile) is known for an economical choice for high-volume maintenance programs and the most widely specified general-purpose sealing elastomer. Expect good resistance to many alcohols, petroleum-based oils, and hydraulic fluids. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Exposure to polar solvents or ketones will shorten service life. The profile itself contributes greater resistance to extrusion than a round section of the same size and simple lathe-cut manufacture at low tooling cost. 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 construction equipment, general industrial maintenance, and fluid power.

Order part number SH70340, sold individually. Unit weight is approximately 9.3608 g. As always, verify media compatibility and operating conditions against the requirements of your specific application.