Coating & Surface Finish

Fasteners, such as Bolts, Screws, Nuts and Washers, can have various types of coatings and platings to enhance their performance, durability, and resistance to corrosion.

Coatings:

1. Zinc coating: Electroplated or hot-dipped zinc for corrosion resistance.

2. Chromate coating: A layer of chromium and oxygen for corrosion resistance and lubricity.

3. Epoxy coating: A thick, protective layer for harsh environments.

4. Polymer coating: A flexible, abrasion-resistant layer.

5. Ceramic coating: A hard, wear-resistant layer.

Platings:

1. Zinc plating: Electroplated zinc for corrosion resistance.

2. Chromium plating: A thin, hard layer for wear resistance and corrosion protection.

3. Nickel plating: A corrosion-resistant layer, often used for high-temperature applications.

4. Cadmium plating: A corrosion-resistant layer, often used for marine or high-humidity environments.

5. Silver plating: A conductive layer for electrical applications.

6. Gold plating: A conductive, corrosion-resistant layer for high-reliability applications.

7. Tin plating: A corrosion-resistant layer, often used for solderability.

8. Copper plating: A conductive layer for electrical applications.

Specialized coatings and platings:

1. Galvanizing: A hot-dipped zinc coating for corrosion resistance.

2. Sherardizing: A hot-dipped zinc coating for corrosion resistance.

3. Electroless nickel plating: A corrosion-resistant layer, often used for high-wear applications.

4. Diamond-like carbon (DLC) coating: A hard, wear-resistant layer.

5. Titanium nitride (TiN) coating: A hard, wear-resistant layer. These coatings and platings can enhance the performance, durability, and corrosion resistance of fasteners, making them suitable for various applications, including construction, automotive, aerospace, and more.