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View Full Version : # 4 Trim Screw Drill Size



Tinkerman
01-03-2010, 03:46 PM
I have been watching the interior trim threads and they have been very helpful. The info has or will keep me from making some mistakes. The question I have, though, is what size drill do I use for that trim screw?

Thanks, Tinkerman

DougF
01-03-2010, 04:11 PM
My industrial chart recommends a #42 drill for a 4-48 tap and a #43 drill for a 4-40 tap. Just as a reminder, numbered drills increase in size as the number decreases.
Granted, that's for taps, but I'd probably look at the #43 for a firmer fit.