568-370 BUNA 70 SQUARE CUT RINGS

Part number SH70370 is an AS568-370 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring supplied with an inside diameter of 8.225 in (208.92 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 8.645 in (219.58 mm). A square-cut ring offers greater contact area against the gland wall than an equivalent o-ring.

The compound resists greases and lubricants, propane and butane, and many alcohols. Buna-N (Nitrile) delivers strong abrasion and tear resistance, the most widely specified general-purpose sealing elastomer. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Applications involving automotive brake fluid or strong acids call for a different compound. The profile itself contributes greater resistance to extrusion than a round section of the same size and simple lathe-cut manufacture at low tooling cost. 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 construction equipment, hydraulic and pneumatic systems, and general industrial maintenance.

Stocked as SH70370 and sold individually. Check the compound against your process media, pressure and temperature before committing to a design.