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luke11cnc
09-08-2011, 08:30 AM
I know some one will be able to help

I would like to know the drill size for tapping the following threads

m5
m6
m8
m10

thank you for your help

James & Luke :question::question:

i2i
09-08-2011, 09:31 AM
if you know the pitch of the thread, take it from the diameter.

thread size - pitch = tapping drill size

m5 - 0.8 = 4.2
m6 - 1 = 5
m8 - 1.25 = 6.75
m10 - 1.5 = 8.5

luke11cnc
09-08-2011, 10:43 AM
thank you i2i

drill bits ordered

James

Jonathan
09-08-2011, 01:25 PM
thank you i2i

drill bits ordered

James

If I'd noticed your post a bit sooner you could have had a few of mine as I keep plenty of spares for the tapping sizes.

Also thread diameter-pitch is only a guide ... hard materials will be easier to drill slightly (0.1mm) bigger. Since 6.75 is not standard you'll want 6.8mm or 6.9mm.