568-314 BUNA 70 SQUARE CUT RINGS

SH70314 is an AS568-314 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring built to an inside diameter of 0.725 in (18.42 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 1.145 in (29.08 mm). In service, this square-cut ring seals with a broad flat contact band instead of the line contact of a round-section ring.

The compound resists many alcohols, hydraulic fluids, and petroleum-based oils. Buna-N (Nitrile) offers reliable performance in both static and dynamic service, low compression set under sustained load. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Exposure to strong acids or automotive brake fluid will shorten service life. The profile itself contributes a rectangular section that will not roll in the groove 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 fluid power, agricultural equipment, and hydraulic and pneumatic systems.

This item is sold individually under part number SH70314. Check the compound against your process media, pressure and temperature before committing to a design. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.