568-114 BUNA 70 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-114 black Buna-N (Nitrile) 70 Shore A built to an inside diameter of 0.612 in (15.54 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 0.818 in (20.78 mm), catalogued under part number SH70114. It seals with a broad flat contact band instead of the line contact of a round-section ring.

Buna-N (Nitrile) is specified here for strong abrasion and tear resistance, low compression set under sustained load. The material holds up against propane and butane, hydraulic fluids, and many alcohols. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Applications involving strong acids 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.

It sees regular use in fluid power, construction equipment, and general industrial maintenance.

Reference part number SH70114 when ordering; the item is sold individually. Unit weight is approximately 0.4452 g and nominal inside diameter is listed as 5/8 inch. 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.