60deg V Threads - tolerancing for plated and unplated

I am faced with trying to understand if one set of tolerances could be used for a design with 60 degree V-threads where for some designs will require only an oil coating and for other designs require zinc chromate plating of thickness .0008" max per surface. This will allow leadtimes for plated parts to be cut down significantly, as my design could be stored on the shelf as an unplated part, and if plating is required, shipped out for plating without having to wait to make the parts with threads for clearance to accomodate the plating. I would like to think this could be done, but my concern is that when unplated the clearance between external and internal threads (flank faces) will be too great or when plated the clearance will not be enough. How does one determine the minimum and maximum clearance between external threads and internal threads?