Plating thickness and selection of tap class

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

I am using a spiral point tap with a standard tap limit to tap SPC material. After tapping with a M4 × 0.7 P2 spiral point tap, the internal thread has a 10 μm thick plating applied. When I use a GP-6H GO thread plug gage, the thread is not the correct size. What type of tap should I use for this application?

When a 10 μm plating thickness is applied, the pitch diameter of the internal thread will become smaller by about 40 μm. In the case of an M4 × 0.7 thread with a 10 μm plating thickness, a P4 limit tap should be used to produce 40 μm larger thread. Please purchase a Yamawa spiral point tap specified as "P 4" instead of using a P2 limit tap. For more information, look at the cutting tap edition of the "Bags of Wisdom Series when you are in trouble", related to plating thickness and oversize tap conditions.

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