I have had a few boxes of drills over the years (#1 through #~75). Each one
has a chart for tap and clear drill sizes for screw sizes #2-56 through 1/4-20.
It's stamped into the front so you can't lose it.
73, Dick, W1KSZ
> Date: Thu, 11 Mar 2010 14:05:45 -0500
> From: email@example.com
> To: firstname.lastname@example.org; email@example.com
> Subject: [TowerTalk] pipe tap drill size
> I am putting two gusset plates to hold truss supports on my homebrew 30m
> Moxon. I'm using 1/4'' X 20 bolts. It's been 40 yr.s since I worked in a
> machine shop. Don't have the proper hole size chart for taps anymore. I
> assume the hole size to be threaded 1/4 x 20 is less than 3/16''. Anyone have
> a chart showing the proper size.TNX
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