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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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