568-344 BUNA 70 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-344 black Buna-N (Nitrile) 70 Shore A supplied with an inside diameter of 3.85 in (97.79 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 4.27 in (108.46 mm), catalogued under part number SH70344. It provides an economical lathe-cut alternative where a moulded o-ring is not required.

The compound resists water, hydraulic fluids, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) is known for low compression set under sustained load and the most widely specified general-purpose sealing elastomer. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Exposure to strong acids or polar solvents will shorten service life. The profile itself contributes simple lathe-cut manufacture at low tooling cost and a flat contact band that spreads sealing load across a wider area. Note that a square section is less suited to high-speed rotary service, where the larger contact area raises friction and heat.

It sees regular use in agricultural equipment, fluid power, and construction equipment.

Reference part number SH70344 when ordering; the item is sold individually. Unit weight is approximately 10.7379 g. As always, verify media compatibility and operating conditions against the requirements of your specific application. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.