Tapping Length

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

I would like to specify the length of the internal thread on the drawing. How the appropriate thread length in general is? If the length is too long, it will be difficult to tap. If it is too short, I am worried that the thread strength will be insufficient.

JIS B 0209 specifies the "Thread engagement length" of the screw threads. In general, it is recommended to use the value of "Normal engagement length: N". For the actual values, please refer to the following table.

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