568-344 BUNA 70 SQUARE CUT RINGS

This quad-ring is supplied in AS568-344 black Buna-N (Nitrile) 70 Shore A square profile 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 seats in a standard o-ring gland while offering improved dynamic performance.

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.

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.