568-135 BUNA 70 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-135 black Buna-N (Nitrile) 70 Shore A supplied with an inside diameter of 1.925 in (48.9 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.131 in (54.13 mm), catalogued under part number SH70135. It seals with a broad flat contact band instead of the line contact of a round-section ring.

This material stands up to petroleum-based oils, many alcohols, and hydraulic fluids. Buna-N (Nitrile) is known for the most widely specified general-purpose sealing elastomer, strong abrasion and tear resistance. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). The profile itself contributes greater resistance to extrusion than a round section of the same size 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 fluid power, general industrial maintenance, and automotive.

Reference part number SH70135 when ordering; the item is sold individually. Unit weight is approximately 1.2682 g and nominal inside diameter is listed as 1 15/16 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.