568-906 BUNA 70 SQUARE CUT RINGS

The SH70906 is an AS568-906 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring measuring an inside diameter of 0.468 in (11.89 mm), a cross section of 0.078 in (1.98 mm), and an outside diameter of 0.624 in (15.85 mm). This 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 specified here for low compression set under sustained load, strong abrasion and tear resistance. Expect good resistance to propane and butane, water, and petroleum-based oils. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Applications involving ozone and direct sunlight or automotive brake fluid call for a different compound. The profile itself contributes simple lathe-cut manufacture at low tooling cost and a flat contact band that spreads sealing load across a wider area. 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 hydraulic and pneumatic systems, automotive, and construction equipment.

This item is sold individually under part number SH70906. Nominal inside diameter is listed as 3/8 inch. Review your operating media and conditions against this specification before installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.