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Sterlingcool-AR501 is a general purpose dark cutting oil that is recommended for a wide variety of applications including threading, sawing, gear cutting and tapping. It contains sulfurized extreme pressure additives that provide excellent lubrication in severe cutting applications. AR501 provides excellent lubricity in pipe threading, sawing, and other tough machining operations. It is ideal for ferrous materials. Staining may occur on copper and aluminum if the part is not rinsed soon after machining.