Maintenance Tips & Tricks – 2000 – #18

By Plant Engineering Staff August 1, 2000
Calculating bits
Problem: Is there an easy method for figuring out what size drill bit to use for tapping a metric hole?

Solution: Simply subtract the thread pitch from the metric screw size and you have the answer. For example, to tap an 8-mm hole with a thread pitch of 1.25, the proper drill bit is 6.75 mm.

Contributor: Fred Hoefer, Electronics Mechanic, CIBA Vision Corp., Duluth, GA; fred.hoefer@

List of Tips & Tricks

Plant Engineering

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