568-027 BUNA 70 SQUARE CUT RINGS

APG stocks the SH70027, an AS568-027 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring measuring an inside diameter of 1.301 in (33.05 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 1.441 in (36.6 mm). A square-cut ring resists the spiral failure that affects round rings on long reciprocating strokes.

The compound resists petroleum-based oils, water, and propane and butane. Buna-N (Nitrile) is widely chosen for strong abrasion and tear resistance, reliable performance in both static and dynamic service. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. It should not be specified for service in ozone and direct sunlight or automotive brake fluid. The profile itself contributes a flat contact band that spreads sealing load across a wider area and simple lathe-cut manufacture at low tooling cost. 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 construction equipment, hydraulic and pneumatic systems, and fluid power.

SH70027 ships individually. Unit weight is approximately 0.346 g and nominal inside diameter is listed as 1 5/16 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.