568-263 BUNA 70 SQUARE CUT RINGS

Part number SH70263 is an AS568-263 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring supplied with an inside diameter of 7.234 in (183.74 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 7.512 in (190.8 mm). A square-cut ring resists the spiral failure that affects round rings on long reciprocating strokes.

As a material, Buna-N (Nitrile) is widely chosen for reliable performance in both static and dynamic service, an economical choice for high-volume maintenance programs. Expect good resistance to propane and butane, greases and lubricants, and petroleum-based oils. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Exposure to ketones or polar solvents will shorten service life. The profile itself contributes simple lathe-cut manufacture at low tooling cost and a rectangular section that will not roll in the groove. 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 hydraulic and pneumatic systems, automotive, and agricultural equipment.

SH70263 ships individually. Unit weight is approximately 7.075 g and nominal inside diameter is listed as 7 1/4 inch. Check the compound against your process media, pressure and temperature before committing to a design.