568-445 BUNA 70 SQUARE CUT RINGS

Ordered as SH70445, this is an AS568-445 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring measuring an inside diameter of 7.975 in (202.57 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 8.525 in (216.54 mm). The square-cut ring offers greater contact area against the gland wall than an equivalent o-ring.

Buna-N (Nitrile) delivers the most widely specified general-purpose sealing elastomer and low compression set under sustained load. It resists propane and butane, petroleum-based oils, and hydraulic fluids. Service temperature is rated from -40°F (-40°C) through 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 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.

Typical settings include automotive, general industrial maintenance, and fluid power.

Reference part number SH70445 when ordering; the item is sold individually. Unit weight is approximately 31.394 g. As always, verify media compatibility and operating conditions against the requirements of your specific application. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.