568-278 BUNA 70 SQUARE CUT RINGS

Ordered as SH70278, this is an AS568-278 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring measuring an inside diameter of 11.984 in (304.39 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 12.262 in (311.45 mm). The square-cut ring presents a flat rectangular section that cannot roll or twist in its groove, making it a dependable static seal.

The compound resists petroleum-based oils, greases and lubricants, and propane and butane. Buna-N (Nitrile) offers an economical choice for high-volume maintenance programs, strong abrasion and tear resistance. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with strong acids or ozone and direct sunlight. The profile itself contributes a rectangular section that will not roll in the groove 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 automotive, agricultural equipment, and general industrial maintenance.

Stocked as SH70278 and sold individually. Nominal inside diameter is listed as 12 inch. Check the compound against your process media, pressure and temperature before committing to a design.