568-448 BUNA 70 SQUARE CUT RINGS

APG stocks the SH70448, an AS568-448 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring with an inside diameter of 9.475 in (240.67 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 10.025 in (254.64 mm). A square-cut ring seals with a broad flat contact band instead of the line contact of a round-section ring.

As a material, Buna-N (Nitrile) delivers reliable performance in both static and dynamic service, the most widely specified general-purpose sealing elastomer. The material holds up against propane and butane, many alcohols, and hydraulic fluids. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with automotive brake fluid or strong acids. The profile itself contributes a flat contact band that spreads sealing load across a wider area and greater resistance to extrusion than a round section of the same size. 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 general industrial maintenance, construction equipment, and fluid power.

This item is sold individually under part number SH70448. Nominal inside diameter is listed as 9 1/2 inch. Review your operating media and conditions against this specification before installation.