568-011 BUNA 70 SQUARE CUT RINGS

APG stocks the SH70011, an AS568-011 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring with an inside diameter of 0.301 in (7.65 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 0.441 in (11.2 mm). A square-cut ring seals with a broad flat contact band instead of the line contact of a round-section ring.

It resists hydraulic fluids, propane and butane, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) is specified for low compression set under sustained load and 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. The profile itself contributes a flat contact band that spreads sealing load across a wider area 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 general industrial maintenance, construction equipment, and hydraulic and pneumatic systems.

SH70011 ships individually. Unit weight is approximately 0.102 g and nominal inside diameter is listed as 5/16 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.