Buna 70-045-Black-Pk10

This o-ring is supplied in AS568-045 black Buna-N (Nitrile) 70 Shore A built to an inside diameter of 3.989 in (101.32 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 4.129 in (104.88 mm), catalogued under part number SB-H70045-10. It seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces. This item is further identified as 0.070CSX3.989"IDX4.129"OD.

The material holds up against petroleum-based oils, hydraulic fluids, and water. That behavior comes from the compound itself: Buna-N (Nitrile) offers low compression set under sustained load and the most widely specified general-purpose sealing elastomer. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Exposure to strong acids or ketones will shorten service life.

Common environments for this compound include general industrial maintenance, fluid power, and hydraulic and pneumatic systems.

Reference part number SB-H70045-10 when ordering; the item is sold by the bag. Nominal inside diameter is listed as 4 inch. Review your operating media and conditions against this specification before installation.