kango
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| posted on 31/1/05 at 05:43 PM |
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Drill Sizes
Anybody with a list of drill size to tap thread eg M5, M6 ect.
Found nothing on the SEARCH.
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Hellfire
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| posted on 31/1/05 at 06:03 PM |
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Good job I did then  :
CLICKEE
Happy drilling!
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mangogrooveworkshop
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| posted on 31/1/05 at 06:15 PM |
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Good link Hellfire
Here is the calculator that I had some time ago
http://www.evergreen.edu/biophysics/technotes/fabric/js-tap.htm 
[Edited on 31-1-05 by mangogrooveworkshop]
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rusty nuts
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| posted on 31/1/05 at 06:31 PM |
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If you haven't got a chart to hand find a nut the same thread as you need to tap and use the largest drill that will go through it, has got me
out of trouble in the past
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flak monkey
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| posted on 31/1/05 at 06:34 PM |
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Another good indicator is the pitch of the thread on a small tap. (Think it works upto about M10)
If you subtract the pitch from the size then you get the tapping drill size:
eg M5x0.8 would be a 4.2mm drill. etc.
Bear in mind the tapping drill depends slightly on the material too. Harder materials use a bigger drill, softer use a smaller one.
Cheers,
David 
Sera
http://www.motosera.com
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