MIL-A-8625 Anodizing – Type II

This finishing provides a conversion on aluminum which changes the surface of the material to a naturally occurring aluminum oxide. The oxide build up changes the surface of the aluminum which then provides greater abrasion resistance as well as increased corrosion protection. The finish will not only build up the aluminum oxide on the surface 0.0002″ – 0.0003″ thick, but will also penetrate into the material the same amount. Other than a clear anodize this coating may also be dyed in various colors.

  • Standard colors include: Black, Clear, Orange, Gold, Red, and Blue
  • Custom colors available

MIL-A-8625 Anodizing – Type III

Describes an anodizing coating where the need for surface hardness and abrasion resistance is the main criteria. The build-up for hard anodizing is much thicker than your standard anodizing. The typical build-up of this coating is 0.001″ and also 0.001″ penetration into the material. The color of the aluminum oxide build up depends greatly on the alloy of the aluminum material.

  • Available in clear and black only
Type 3 Anodizing
Type 2 Chromate


The “Military Specification, Chemical Conversion Coatings on Aluminum and Aluminum Alloys” covering chemical conversion coatings formed by the reaction of chemical conversion materials with the surfaces of aluminum and aluminum alloys. Aluminum chromate conversion coating improve the corrosion resistance of wrought, heat treatable and cast aluminum alloys.


Racking, also called jigging, is one of the most important steps in the anodizing process. The basic functions of the racking is to hold the part tight during transfer between the different process tanks and to provide sufficient contact to the part, so that enough current can run, to form a uniform layer on the aluminum part.

AMC understands the importance of handling and racking of the parts to be coated. We adhere to customers and AMC internal work instructions for optimum quality.