Black oxide is a conversion coating that creates a black, matte finish on steel fasteners. This process enhances corrosion resistance and provides a uniform appearance. While not as protective as zinc coatings, black oxide is often used for aesthetic purposes and applications where minimal friction is required.

Zinc plating involves applying a thin layer of zinc to steel fasteners to provide corrosion resistance. This finish is often used for indoor applications and is available in various colors, these fasteners are yellow chromate. Zinc plating is a cost-effective option and helps protect against rust.