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Taps
Taps are application tools used to cut threads in metal and plastic. Standard manual tap drills are unsuitable for this purpose and instead spiral-fluted machine taps have to be used.
The required core hole diameter for hand-cut threads with a three-piece tap set is calculated with the following rule of thumb:
core hole = thread diameter x 0.8
For threads cut with machine taps (so-called bottoming taps) you can use the formula:
core hole = nominal thread diameter
core hole = minus thread pitch
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