568-355 BUNA 70 SQUARE CUT RINGS

SH70355 is an AS568-355 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring with an inside diameter of 5.225 in (132.72 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 5.645 in (143.38 mm). In service, this square-cut ring presents a flat rectangular section that cannot roll or twist in its groove, making it a dependable static seal.

This material stands up to water, propane and butane, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) delivers low compression set under sustained load, reliable performance in both static and dynamic service. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Exposure to ozone and direct sunlight or strong acids will shorten service life. 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.

Typical settings include construction equipment, general industrial maintenance, and hydraulic and pneumatic systems.

Order part number SH70355, sold individually. Unit weight is approximately 14.3009 g and nominal inside diameter is listed as 5 1/4 inch. Review your operating media and conditions against this specification before installation.