Buna 70-339-Black-Pk50

This o-ring is supplied in AS568-339 black Buna-N (Nitrile) 70 Shore A measuring an inside diameter of 3.225 in (81.92 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 3.645 in (92.58 mm), catalogued under part number SB-H70339-50. It creates a positive seal at flange, piston and rod interfaces without added hardware. This item is further identified as 3.625IDX3.25"ODX.1875"CS.

The material holds up against greases and lubricants, petroleum-based oils, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for the most widely specified general-purpose sealing elastomer, reliable performance in both static and dynamic service. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with automotive brake fluid or ozone and direct sunlight.

It sees regular use in automotive, hydraulic and pneumatic systems, and general industrial maintenance.

This item is sold by the bag under part number SB-H70339-50. Nominal inside diameter is listed as 3 1/4 inch. Check the compound against your process media, pressure and temperature before committing to a design. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.