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Hard anodizing is a term used to describe anodic coatings with surface hardness and/or abrasion resistance as their primary characteristic. Great for surface to surface sliding with low loads The color of the natural anodic coating depends on the alloy and the coating thickness. e.g. 6061 has a tan or gray color which darkens to almost black at .003"; 6063 has an amber shade which darkens to bronze. Both are considered clear.  After hard anodizing  surfaces may be sealed in boiling distilled water, sodium dichromate solution, dewatering oil, wax or PTFE solutions

Class 1: Not dyed or pigmented. 

Class 2: Dyed. (Specify color on Drawing).
Hard anodic oxide coatings find application in the engineering industry for components which require a very wear resistant surface. " Flash" hard anodize may be used instead of conventional anodize for corrosion resistance

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