Hardcoat Anodize
(MIL-PRF-8625 Type III)

Provides superior hardness and coating density compared to Type II Anodize. Abrasion testing shows hardcoat exceeds wear characteristics of other hard coatings such as electroless nickel, hardchrome, and ceramic. When a part is hardcoated, it increases the micro finish 2-5 times, depending on the alloy.

Standard Specifications

MIL-PRF-8625 Type III, Class 1 & 2
RoHS, REACH, ELV & WEEE Compliant

Performance Benefits

  • Wear Resistance
  • Corrosion Resistance
  • High Dielectric Strength
  • Heat Dissipation
  • Thermal Dissipation
  • Improved Aesthetics

PTFE Infusion

Added lubricity and release qualities can be added by PTFE impregnation after the hardcoat process.

Receptive Metals

Some Alloys form better oxide coatings than others because of the influence of the alloying constituents in the structure of the coating. Alloys with higher copper contents do not accept the hardcoat process as well. 6061 is the best alloy for anodizing.


Maximum thickness dependent on alloy

Quoting Information

Factoring costs: consider these points when gauging a general price for the part you want hardcoat anodized.

Black Hardcoat on object.

Areas you don’t want coated must be masked with maskant paint, tape or plugs. This is done by hand and will add quite a bit to your cost. Threaded holes, tapped holes, bores or other close tolerance areas can be stopped off, but when you want flat areas not coated get out your wallet. Masking often fails during the hardcoat process because of the high agitation in the tanks and changing temperatures in each tank.

Contact Points

The process requires positive electrical contact with each part. For this reason, it is necessary to make contact through a tapped hole, bolted connection, or a clamp on the edge. These contact points will leave small uncoated spots. It is important to designate the area where the coating is primarily desired and where electrical contact can be made.


It is important to note that approximately one half of the total thickness is growth. A standard .002’ coating on a cylindrical part will increase the overall diameter by .002” (.001” per side)