Buna 70-359-Black-Pk5

SB-H70359-5 is an AS568-359 black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 5.725 in (145.42 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 6.145 in (156.08 mm). In service, this o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces. Additional detail on this item: 0.210CSX5.725"IDX6.145"OD.

The material holds up against many alcohols, hydraulic fluids, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for reliable performance in both static and dynamic service, low compression set under sustained load. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Exposure to ozone and direct sunlight or strong acids will shorten service life.

Common environments for this compound include general industrial maintenance, construction equipment, and agricultural equipment.

Stocked as SB-H70359-5 and sold by the bag. Nominal inside diameter is listed as 5 3/4 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.