568-318 BUNA 70 SQUARE CUT RINGS

This quad-ring is supplied in AS568-318 black Buna-N (Nitrile) 70 Shore A square profile built to an inside diameter of 0.975 in (24.77 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 1.395 in (35.43 mm), catalogued under part number SH70318. It resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

This material stands up to many alcohols, greases and lubricants, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) delivers strong abrasion and tear resistance, low compression set under sustained load. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C).

Maintenance and OEM teams specify it across general industrial maintenance, agricultural equipment, and fluid power.

This item is sold individually under part number SH70318. Nominal inside diameter is listed as 1 inch. Check the compound against your process media, pressure and temperature before committing to a design. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.