568-154 BUNA 70 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-154 black Buna-N (Nitrile) 70 Shore A built to an inside diameter of 3.737 in (94.92 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 3.943 in (100.15 mm), catalogued under part number SH70154. It resists the spiral failure that affects round rings on long reciprocating strokes.

The compound resists many alcohols, water, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) offers reliable performance in both static and dynamic service, an economical choice for high-volume maintenance programs. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. It should not be specified for service in ozone and direct sunlight or polar solvents. 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.

Common environments for this compound include agricultural equipment, automotive, and fluid power.

Order part number SH70154, sold individually. Unit weight is approximately 2.027 g and nominal inside diameter is listed as 3 3/4 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. 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.