View Full Version : drill size
luke11cnc
09-08-2011, 07:30 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:
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, 09:43 AM
thank you i2i
drill bits ordered
James
Jonathan
09-08-2011, 12:25 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.
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