Why Are Black Oxides

Instead, the black oxide coating is produced by a chemical reaction between the iron on the surface of the ferrous metal and the oxidizing salts present in the black oxide solution. These oxidizing salts include penetrates, catalysts, activators and proprietary additives which all take part in the chemical reaction.

What oxides are black?

• Steel.
• Stainless Steel.
• Cast Iron.
• Aluminum.
• Copper, Brass, & Bronze.
• Nickel.
• Cadmium.
• Zinc.

Is black oxide good?

Black oxide bits last up to 50% longer than standard HSS bits. They offer superior durability and speed. Many pros find they get years of use from them and consider black oxide bits the best general-purpose drill bits you can buy.