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Old 30th May 2004, 03:33 AM   #1
Jean is offline Jean  United States
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Default newbie drill/tap question

What drill and tap size is best to use with 4-40 thread ? Is drill No. 43 correct ?
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Old 30th May 2004, 03:55 AM   #2
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Yes, #43 is correct for a normal tap. (There is another kind of tap called a "roll tap" or a "thread-forming tap" that requires a different drill size.)

The best place to find this information on-line is McMaster-Carr. On their web site you can download PDFs of their catalog pages. They have a page that has tables for drill sizes and another page with the drill sizes required for various taps.
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Old 30th May 2004, 04:25 AM   #3
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Thanks, appreciate it !
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Old 30th May 2004, 05:40 AM   #4
Jean is offline Jean  United States
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I looked on the http://www.mcmaster.com website and found what drill bits to use for each tap size.

How do I figure out what DRILL bit #43 , 36, 29 and 21 equal to ? I bought a Dewalt drill kit and they aren't numbered in the same way.
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