[TowerTalk] pipe tap drill size

[Jan Wise]

I don't have a chart, but it takes a #7 drill bit.

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of r miles
Sent: Thursday, March 11, 2010 1:06 PM
To: antennas; towertalk
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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