*568-174 BUNA 70 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-174 black Buna-N (Nitrile) 70 Shore A supplied with an inside diameter of 8.737 in (221.92 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 8.943 in (227.15 mm), catalogued under part number SH70174. It resists the spiral failure that affects round rings on long reciprocating strokes.

Buna-N (Nitrile) is widely chosen for the most widely specified general-purpose sealing elastomer, strong abrasion and tear resistance. It resists propane and butane, petroleum-based oils, and water. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). The profile itself contributes simple lathe-cut manufacture at low tooling cost 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.

You will find this material specified across automotive, construction equipment, and general industrial maintenance.

Stocked as SH70174 and sold individually. Unit weight is approximately 4.539 g and nominal inside diameter is listed as 8 3/4 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. For a size or compound outside the standard catalog, APG can quote from a print or sample.