568-908 BUNA 70 SQUARE CUT RINGS

Part number SH70908 is an AS568-908 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring supplied with an inside diameter of 0.644 in (16.36 mm), a cross section of 0.087 in (2.21 mm), and an outside diameter of 0.818 in (20.78 mm). A square-cut ring seals with a broad flat contact band instead of the line contact of a round-section ring.

It resists many alcohols, petroleum-based oils, and water. Buna-N (Nitrile) delivers strong abrasion and tear resistance, the most widely specified general-purpose sealing elastomer. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with ozone and direct sunlight or automotive brake fluid. 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 construction equipment, agricultural equipment, and fluid power.

This item is sold individually under part number SH70908. Nominal inside diameter is listed as 1/2 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.