568-383 BUNA 70 SQUARE CUT RINGS

APG stocks the SH70383, an AS568-383 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring built to an inside diameter of 13.975 in (354.97 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 14.395 in (365.63 mm). A square-cut ring seals with a broad flat contact band instead of the line contact of a round-section ring.

This material stands up to greases and lubricants, hydraulic fluids, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) delivers low compression set under sustained load and an economical choice for high-volume maintenance programs. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with strong acids or automotive brake fluid. The profile itself contributes a rectangular section that will not roll in the groove 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.

Typical settings include construction equipment, automotive, and hydraulic and pneumatic systems.

This item is sold individually under part number SH70383. Check the compound against your process media, pressure and temperature before committing to a design. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.