Buna 70-239-Black-Pk25

Ordered as SB-H70239-25, this is an AS568-239 black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 3.609 in (91.67 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 3.887 in (98.73 mm). The o-ring remains the most cost-effective sealing element available for pressurized assemblies. The catalog record notes: 0.139CSX3.609"IDX3.887"OD.

As a material, Buna-N (Nitrile) is valued for strong abrasion and tear resistance, the most widely specified general-purpose sealing elastomer. The material holds up against greases and lubricants, many alcohols, and hydraulic fluids. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Exposure to polar solvents or ketones will shorten service life.

Typical settings include hydraulic and pneumatic systems, general industrial maintenance, and agricultural equipment.

This item is sold by the bag under part number SB-H70239-25. Nominal inside diameter is listed as 3 5/8 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.