568-329 BUNA 70 SQUARE CUT RINGS

This quad-ring is supplied in AS568-329 black Buna-N (Nitrile) 70 Shore A square profile measuring an inside diameter of 1.975 in (50.17 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 2.395 in (60.83 mm), catalogued under part number SH70329. It uses a four-lobed profile to create two sealing surfaces per side, reducing the squeeze needed to seal.

This material stands up to many alcohols, water, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) is specified for reliable performance in both static and dynamic service, strong abrasion and tear resistance. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where automotive brake fluid or strong acids are present.

You will find this material specified across general industrial maintenance, automotive, and fluid power.

This item is sold individually under part number SH70329. Unit weight is approximately 4.816 g and nominal inside diameter is listed as 2 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.