568-003 BUNA 70 SQUARE CUT RINGS

Ordered as SH70003, this is an AS568-003 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring with an inside diameter of 0.056 in (1.42 mm), a cross section of 0.06 in (1.52 mm), and an outside diameter of 0.176 in (4.47 mm). The square-cut ring offers greater contact area against the gland wall than an equivalent o-ring.

Buna-N (Nitrile) is valued for strong abrasion and tear resistance, an economical choice for high-volume maintenance programs. Expect good resistance to greases and lubricants, propane and butane, and petroleum-based oils. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Applications involving strong acids or polar solvents call for a different compound. 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.

It sees regular use in fluid power, hydraulic and pneumatic systems, and automotive.

Stocked as SH70003 and sold individually. Nominal inside diameter is listed as 1/16 inch. Review your operating media and conditions against this specification before installation.