Q. We manufacture aluminum screws with a very fine pitch. How can we finish the part so that it is wear-resistant, provides smooth movement, and is black in color? Any help would be appreciated. J. C.
A. There are two methods that you might consider for finishing of your parts:
- Hard anodize the part without sealing. Hard anodizing usually gives a dark gray or black finish depending on the aluminum alloy.
- Apply a standard anodized coating that is dyed black. Instead of using a nickel acetate or hot water seal use an oil or wax seal.
Whether you will get the smooth movement you desire has more to do with the mating surfaces than it does the finish on the thread surfaces.
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