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The size of drill?

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saw:
Hi, I need to know, how big must I drill for threading a 5-40 tapp?
I found this:
  TAP    Decimal Drill Size
4-40     .0860
4-48     .0935
5-40     .0980

Do you think that this is right?  :smart:

Jasonb:
that may be a bit on teh tight side, for most things you don't need such a full thread engagement, try a #43 drill which is 0.089"

Jason

saw:
Thanks Jasonb   :thumbup:
Where can I find a tabel for all of those drills and tabs. I am use to mm so this is hard for me. :doh:

mklotz:
Diameter of numbered screws = 0.060 + 0.013*N where N is the screw number.  Thus for a #5...

Diameter = 0.060 + 0.013*5 = 0.125

Tap drill size for 77% depth of thread = major diameter - 1/tpi = 0.125 - 1/40 = 0.1"

For other percentages of depth of thread

Tap drill size = major diameter - 0.013*dot/tpi

where dot = depth of thread expressed as percentage.

saw:
Thank you, but I am not sure that I am a wize man for that  :doh:
However I found this page http://www.csgnetwork.com/drillsizeconvert.html så I know a bit what it is.
It's so hard to try to do somthing from a US-plan, you have inc, you have your fanny number(#40) iver you're plan is diffrent. It's like learning a new language, but I am stupid enough so I continue. I can always learn somthing new, or just change som words with some new friends.  :wave:

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