568-928 BUNA 70 SQUARE CUT RINGS

This quad-ring is supplied in AS568-928 black Buna-N (Nitrile) 70 Shore A square profile with an inside diameter of 2.09 in (53.09 mm), a cross section of 0.118 in (3 mm), and an outside diameter of 2.326 in (59.08 mm), catalogued under part number SH70928. It uses a four-lobed profile to create two sealing surfaces per side, reducing the squeeze needed to seal.

Expect good resistance to propane and butane, petroleum-based oils, and water. That behavior comes from the compound itself: Buna-N (Nitrile) offers 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 should not be specified for service in ketones or strong acids.

Maintenance and OEM teams specify it across general industrial maintenance, construction equipment, and automotive.

Order part number SH70928, sold individually. Application requirements vary, so validate compatibility with your process conditions prior to installation. 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.