Google is your friend--
look for "Tap Drill Size"
Tap drill-- #7 = 0.201"
Tight clearance hole is # F = 0.257"
Bill--W4BSG
----- Original Message -----
From: "r miles" <greenacres113@charter.net>
To: "antennas" <antennas@mailman.qth.net>; "towertalk"
<towertalk@contesting.com>
Sent: Thursday, March 11, 2010 1:05 PM
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
> K9IL
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