United Engineered Tooling Is Your Source For Black Oxide

ISO 9001 Registered 

United Engineered tooling is the go to source in northern Michigan, we have many clients through out the United States and the world. We provide our customers with outstanding service, excellent quality, competitive pricing, on-time delivery and continuous improvement. Protecting the environment is important to us, that is why we always adherence to regulations and continue to reduce our waste generation and resource usage.

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Black Oxide is the conversion coating formed by a chemical reaction with the iron in the metal to form an integral protective surface. When parts are immersed in the alkaline aqueous salt solution operated at approximately 285 degrees F, oxidizing salts react with the iron to form magnetite 304, the black oxide of iron. This process adds 5-10 millionths to the surface of a part and penetrates the surface another 5-10 millionths. Contrasted to an applied coating which bonds to the metal but does not react chemically. A black oxide conversion coating is applied to ferrous alloys


Black Oxide metal finishing is provided at no charge, when we machine your parts. Available upon request. Black oxide cannot be produced over plated parts (zinc, nickel, chromium, cadmium, phosphate). This plating must be stripped prior to the black oxide process.

Other names for Black Oxide

  • Black Penetrate
  • Black Magic
  • Black’n
  • Gun Bluing 

black oxide tank

ISO 9001 Registered 

Telephone 231-947-3650
FAX 231-947-4902
Postal address
1974 Cass-Hartman Court 
Traverse City, MI 49685