568-004 BUNA 70 SQUARE CUT RINGS

Part number SH70004 is an AS568-004 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring built to an inside diameter of 0.07 in (1.78 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 0.21 in (5.33 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 specified here for low compression set under sustained load, strong abrasion and tear resistance. Expect good resistance to many alcohols, water, and propane and butane. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with ozone and direct sunlight or ketones. The profile itself contributes a flat contact band that spreads sealing load across a wider area 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.

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

This item is sold individually under part number SH70004. Nominal inside diameter is listed as 5/64 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.