Anodize Type III per MIL-A-8625 (RoHS)

Hardcoat Anodizing, often called "Type III anodizing" as denoted by the MIL-A-8625 specification, is an electrochemical process that creates a controlled oxide film on the surface of aluminum. Hardcoat Anodizing utilizes sulfuric acid, low bath temperatures, and constant current rectification to achieve a very hard coating (60-70 Rockwell C). Hardcoat Anodizing is generally used for applications that need a corrosion, abrasion, and wear resistant coating. The appearance of the coating ranges from light to dark gray, depending on the alloy makeup of the aluminum substrate, and it can also be dyed black. Parts can be processed with multiple finishes, such as Hard Coat/Chem Film or Hard Coat/Electroless Nickel Plating.

  • Class 1, Natural
  • Class 2, color
  • Slik-Seal with PTFE per MIL-A-63576, TYPE I
  • Tuff-Kote with PTFE per MIL-A-63576, TYPE III


  • Compatible with adhesives
  • Excellent lubricity
  • Resistant to marine and atmospheric corrosion
  • High operating temperatures
  • Electrically resistant
  • Galvanic neutrality (prevents galvanic corrosion from interaction between dissimilar metals)



  • Thickness ranges: 0.0001" to 0.0030" NOTE: anodizing thickness constitutes 50% build, 50% penetration into the substrate, which must be accounted for when calculating pre-anodize machining tolerances
  • Available with PTFE (Teflon®) impregnation for enhanced tribological properties
  • Rack and bulk processing
  • Precision masking for selective anodizing
  • Post anodize seals available for increased corrosion resistance but may reduce surface hardness¬†


  • Aerospace/Astrospace/Aviation: wear resistance, dry lubrication, longevity and electrical insulation
  • Firearms: corrosion and wear resistance
  • Machinery: abrasion resistance for high-speed machine parts
  • Electronics: uniform emissivity and a high dielectric
  • Marine/Naval: corrosion resistance in salt-water environments
  • Oil and Petrochemical: corrosion protection and wear resistance.
  • Ordnance: corrosion protection, abrasion resistance and wear resistance
  • Cookware: corrosion protection and non-stick properties
  • Molds and Dies: improved release properties and abrasion resistance
  • Sporting Goods: improved durability and performance