Buna 70-251-Black-Pk10

Ordered as SB-H70251-10, this is an AS568-251 black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 5.109 in (129.77 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.387 in (136.83 mm). The o-ring remains the most cost-effective sealing element available for pressurized assemblies. Source specification: 5.375IDX5.125"ODX.125"CS.

As a material, Buna-N (Nitrile) is widely chosen for reliable performance in both static and dynamic service, the most widely specified general-purpose sealing elastomer. This material stands up to petroleum-based oils, water, and greases and lubricants. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Applications involving automotive brake fluid or ketones call for a different compound.

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

This item is sold by the bag under part number SB-H70251-10. Nominal inside diameter is listed as 5 1/8 inch. Check the compound against your process media, pressure and temperature before committing to a design. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.