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Re: [TowerTalk] pipe tap drill size

To: TowerTalk <towertalk@contesting.com>
Subject: Re: [TowerTalk] pipe tap drill size
From: RICHARD SOLOMON <w1ksz@q.com>
Reply-to: "Tower and HF antenna construction topics." <towertalk@contesting.com>
Date: Fri, 12 Mar 2010 01:19:28 +0000
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
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: greenacres113@charter.net
> To: antennas@mailman.qth.net; towertalk@contesting.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
> K9IL
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