568-346 BUNA 70 SQUARE CUT RINGS

Part number SH70346 is an AS568-346 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring built to an inside diameter of 4.1 in (104.14 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 4.52 in (114.81 mm). A square-cut ring resists the spiral failure that affects round rings on long reciprocating strokes.

This material stands up to water, petroleum-based oils, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) is known for an economical choice for high-volume maintenance programs and low compression set under sustained load. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where strong acids or polar solvents are present. The profile itself contributes greater resistance to extrusion than a round section of the same size 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.

You will find this material specified across construction equipment, hydraulic and pneumatic systems, and general industrial maintenance.

Reference part number SH70346 when ordering; the item is sold individually. Review your operating media and conditions against this specification before installation.