Plating thickness and oversized tap

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Cutting Taps Metric Threads Standard (Screw Threads, Center Holes)

I have a question about applying a plating after cutting an internal thread with metric tap. For example, when applying a 10 μm thick plating on a flat surface, the plating thickness needs to be 10 μm. When applying a plating on an internal thread, how much larger does the tap need to be over a standard tap size to create a 10 μm plating thickness?

Basically, when a plating is applied to an internal thread, the pitch diameter of the internal thread will be reduced by four times the plating thickness. In this example, it would be 10 μm × 4 = 40 μm, so it is recommended to use an oversized tap with a standard tap limit accuracy of + 40 μm.

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