568-924 BUNA 70 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-924 black Buna-N (Nitrile) 70 Shore A measuring an inside diameter of 1.72 in (43.69 mm), a cross section of 0.118 in (3 mm), and an outside diameter of 1.956 in (49.68 mm), catalogued under part number SH70924. 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, greases and lubricants, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) offers the most widely specified general-purpose sealing elastomer and an economical choice for high-volume maintenance programs. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). 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.

It sees regular use in fluid power, hydraulic and pneumatic systems, and agricultural equipment.

Reference part number SH70924 when ordering; the item is sold individually. Nominal inside diameter is listed as 1 1/2 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.