568-469 BUNA 70 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-469 black Buna-N (Nitrile) 70 Shore A measuring an inside diameter of 19.955 in (506.86 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 20.505 in (520.83 mm), catalogued under part number SH70469. It seals with a broad flat contact band instead of the line contact of a round-section ring.

The material holds up against many alcohols, propane and butane, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) is known for the most widely specified general-purpose sealing elastomer and low compression set under sustained load. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). The profile itself contributes greater resistance to extrusion than a round section of the same size 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.

Common environments for this compound include automotive, agricultural equipment, and fluid power.

Stocked as SH70469 and sold individually. Nominal inside diameter is listed as 20 inch. Check the compound against your process media, pressure and temperature before committing to a design.