568-028 BUNA 70 SQUARE CUT RINGS

Part number SH70028 is an AS568-028 black Buna-N (Nitrile) 70 Shore A square profile Quad-Ring measuring an inside diameter of 1.364 in (34.65 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 1.504 in (38.2 mm). A quad-ring uses a four-lobed profile to create two sealing surfaces per side, reducing the squeeze needed to seal.

The compound resists greases and lubricants, propane and butane, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) offers low compression set under sustained load, reliable performance in both static and dynamic service. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Applications involving ketones or automotive brake fluid call for a different compound.

Common environments for this compound include general industrial maintenance, agricultural equipment, and construction equipment.

This item is sold individually under part number SH70028. Unit weight is approximately 0.355 g and nominal inside diameter is listed as 1 3/8 inch. Review your operating media and conditions against this specification before installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.