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Need wear resistant coating on aluminum positioning bosses

I have two positioning bosses machined into an aluminum mount that I am holding to 0.0002 tolerance. I would like to apply a finish to the mount that can work wth the feature tolerance of the bosses and supply some amount of wear resistance on the bosses.

Any suggestions?

David Egan
Designer - Londonderry, NH 03051
2007

Two things come to mind. Electroless nickel or a PVD coating like titanium nitride.

James Watts
- Navarre, Florida
2007

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