Buna 70-338-Black-Pk50

Part number SB-H70338-50 is an AS568-338 black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 3.1 in (78.74 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 3.52 in (89.41 mm). An o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces. The catalog record notes: 3.5IDX3.125"ODX.1875"CS.

It resists petroleum-based oils, many alcohols, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) delivers strong abrasion and tear resistance, an economical choice for high-volume maintenance programs. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Exposure to strong acids or ozone and direct sunlight will shorten service life.

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

This item is sold by the bag under part number SB-H70338-50. Check the compound against your process media, pressure and temperature before committing to a design.