Buna 70-244-Black-Pk50

SB-H70244-50 is an AS568-244 black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 4.234 in (107.54 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 4.512 in (114.6 mm). In service, this o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces. This item is further identified as 4.5IDX4.25"ODX.125"CS.

The compound resists petroleum-based oils, many alcohols, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) delivers the most widely specified general-purpose sealing elastomer and low compression set under sustained load. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Exposure to ketones or ozone and direct sunlight will shorten service life.

Typical settings include fluid power, hydraulic and pneumatic systems, and automotive.

SB-H70244-50 ships by the bag. Review your operating media and conditions against this specification before installation. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.