568-374 BUNA 70 SQUARE CUT RINGS

Part number SH70374 is an AS568-374 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring measuring an inside diameter of 9.225 in (234.32 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 9.645 in (244.98 mm). A square-cut ring presents a flat rectangular section that cannot roll or twist in its groove, making it a dependable static seal.

Buna-N (Nitrile) is widely chosen for reliable performance in both static and dynamic service, strong abrasion and tear resistance. The compound resists petroleum-based oils, many alcohols, and hydraulic fluids. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Applications involving strong acids or automotive brake fluid call for a different compound. 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.

Common environments for this compound include construction equipment, hydraulic and pneumatic systems, and fluid power.

Reference part number SH70374 when ordering; the item is sold individually. Nominal inside diameter is listed as 9 1/4 inch. Review your operating media and conditions against this specification before installation.