568-247 BUNA 70 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-247 black Buna-N (Nitrile) 70 Shore A measuring an inside diameter of 4.609 in (117.07 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 4.887 in (124.13 mm), catalogued under part number SH70247. It offers greater contact area against the gland wall than an equivalent o-ring.

As a material, Buna-N (Nitrile) is known for strong abrasion and tear resistance, reliable performance in both static and dynamic service. It resists petroleum-based oils, many alcohols, and greases and lubricants. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where automotive brake fluid or polar solvents are present. 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 hydraulic and pneumatic systems, agricultural equipment, and general industrial maintenance.

Order part number SH70247, sold individually. Unit weight is approximately 4.2847 g and nominal inside diameter is listed as 4 5/8 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.