Tap drill sizes - CNCzone.com-The Largest Machinist Community on the net!

gman · #1 11-18-2006, 07:26 AM

I'm not sure if this is the correct forum or has been discussed in the past. But here is a very simple formula on finding the correct tap drill size.

tap size-pitch=tap drill
example 1/4-20 tap is .201 tap drill
.250-(1/20)=.20

zcases · #2 11-18-2006, 07:57 AM

And this is even easier in metric......M3 x .5 thread, M3 - .5 = 2.5mm tap drill.

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