568-335 BUNA 70 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-335 black Buna-N (Nitrile) 70 Shore A supplied with an inside diameter of 2.725 in (69.22 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 3.145 in (79.88 mm), catalogued under part number SH70335. It offers greater contact area against the gland wall than an equivalent o-ring.

As a material, Buna-N (Nitrile) offers the most widely specified general-purpose sealing elastomer and low compression set under sustained load. It resists greases and lubricants, petroleum-based oils, and water. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. It is not the right choice where strong acids or polar solvents are present. The profile itself contributes a flat contact band that spreads sealing load across a wider area 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.

You will find this material specified across construction equipment, hydraulic and pneumatic systems, and agricultural equipment.

Reference part number SH70335 when ordering; the item is sold individually. Unit weight is approximately 7.759 g and nominal inside diameter is listed as 2 3/4 inch. Check the compound against your process media, pressure and temperature before committing to a design.