black oxide is used to provide a protective, corrosion resistant coating over metal. It has a uniform black finish that does not alter the dimensions ...United Plating Inc.
Black oxide, also know as gun bluing, is a conversion coating formed by a chemical reaction produced when parts are immersed in the alkaline aqueous ...The Lindgren Group
These are like the above ARP Studs, only these have a Black Oxide Finish and are made of 8740 chrome moly and have a very high tensile strength. ...proweldperformanceparts
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