Buna 70-259-Black-Pk10

APG stocks the SB-H70259-10, an AS568-259 black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 6.234 in (158.34 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 6.512 in (165.4 mm). An o-ring creates a positive seal at flange, piston and rod interfaces without added hardware. Source specification: 6.5IDX6.25"ODX.125"CS.

Buna-N (Nitrile) is specified for an economical choice for high-volume maintenance programs and the most widely specified general-purpose sealing elastomer. The compound resists propane and butane, many alcohols, and hydraulic fluids. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Applications involving strong acids or automotive brake fluid call for a different compound.

Typical settings include automotive, hydraulic and pneumatic systems, and agricultural equipment.

Reference part number SB-H70259-10 when ordering; the item is sold by the bag. Nominal inside diameter is listed as 6 1/4 inch. Check the compound against your process media, pressure and temperature before committing to a design. For a size or compound outside the standard catalog, APG can quote from a print or sample.