Friday, July 22, 2011

Tech Tip #1: Threading: Drill Formula for Metric Taps

The formula is Basic Major Diameter minus the Pitch = Hole Size.
For example, a M5 X 0.8 thread would be calculated as follows:
5.00mm minus 0.80mm = 4.20mm hole size.
Simply select the nearest available drill size.
The hole produced would yield approximately 70-75% percentage of thread.

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