Buna 70-245-Black-Pk25

Ordered as SB-H70245-25, this is an AS568-245 black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 4.359 in (110.72 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 4.637 in (117.78 mm). The o-ring remains the most cost-effective sealing element available for pressurized assemblies. Supplementary detail from the product record: 4.625IDX4.375"ODX.125"CS.

The material holds up against petroleum-based oils, hydraulic fluids, and many alcohols. Buna-N (Nitrile) is specified for the most widely specified general-purpose sealing elastomer, strong abrasion and tear resistance. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Applications involving strong acids or ozone and direct sunlight call for a different compound.

You will find this material specified across agricultural equipment, fluid power, and construction equipment.

SB-H70245-25 ships by the bag. Nominal inside diameter is listed as 4 3/8 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. For a size or compound outside the standard catalog, APG can quote from a print or sample.