568-327 BUNA 70 SQUARE CUT RINGS

Part number SH70327 is an AS568-327 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring with an inside diameter of 1.725 in (43.82 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 2.145 in (54.48 mm). A square-cut ring seals with a broad flat contact band instead of the line contact of a round-section ring.

This material stands up to many alcohols, water, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) offers low compression set under sustained load and an economical choice for high-volume maintenance programs. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in ozone and direct sunlight or automotive brake fluid. The profile itself contributes a rectangular section that will not roll in the groove and greater resistance to extrusion than a round section of the same size. 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 fluid power, agricultural equipment, and construction equipment.

Order part number SH70327, sold individually. Unit weight is approximately 5.109 g and nominal inside diameter is listed as 1 3/4 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.