568-020 BUNA 70 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-020 black Buna-N (Nitrile) 70 Shore A with an inside diameter of 0.864 in (21.95 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 1.004 in (25.5 mm), catalogued under part number SH70020. It resists the spiral failure that affects round rings on long reciprocating strokes.

Buna-N (Nitrile) is specified here for strong abrasion and tear resistance, most widely specified general-purpose sealing elastomer. The material holds up against petroleum-based oils, hydraulic fluids, and many alcohols. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Applications involving ketones or polar solvents call for a different compound. 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.

Maintenance and OEM teams specify it across fluid power, automotive, and agricultural equipment.

SH70020 ships individually. Unit weight is approximately 0.3036 g and nominal inside diameter is listed as 7/8 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.