Buna 70-433-Black-Pk5

Part number SB-H70433-5 is an AS568-433 black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 5.475 in (139.07 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 6.025 in (153.04 mm). An 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 6IDX5.5"ODX.25"CS.

It resists hydraulic fluids, greases and lubricants, and water. That behavior comes from the compound itself: Buna-N (Nitrile) offers reliable performance in both static and dynamic service, low compression set under sustained load. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Applications involving automotive brake fluid or ketones call for a different compound.

You will find this material specified across agricultural equipment, construction equipment, and fluid power.

SB-H70433-5 ships by the bag. Nominal inside diameter is listed as 5 1/2 inch. Check the compound against your process media, pressure and temperature before committing to a design. 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.