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Cutting Taps: How to calculate a hole

【英】困ったときの知恵袋詳細
Cutting Taps Metric Threads How to use
How I can calculate the hole size before tapping when I use a Spiral Fluted Tap size M12 x 1.5?
The best way is to check the hole size in a drill/tap table. (See the table below) You can also calculate it with a simple formula if there is no such table available. Note: The following suggestion is based on how to calculate the hole size of a Cutting Tap such as Spiral Fluted Taps (SP).

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