Thanks for the clarification Jim - you are correct. Those 105's you have must
be pretty stout 😉
73
Matt
KM5VI
-----Original Message-----
From: TowerTalk <towertalk-bounces@contesting.com> On Behalf Of jim.thom
jim.thom@telus.net
Sent: Monday, April 04, 2022 11:36 AM
To: towertalk@contesting.com
Subject: [TowerTalk] Rohn anchor bolts, grade?
Date: Mon, 4 Apr 2022 09:30:03 -0500
From: <maflukey@gmail.com>
To: "'WW3S'" <ww3s@zoominternet.net>, "'Jon Zaimes, AA1K'"
<jz73@verizon.net>
Cc: <tommy@k6ye.com>, <TowerTalk@contesting.com>
Subject: Re: [TowerTalk] Rohn anchor bolts, grade?
<I think ASTM F1554 replaced the previous anchor bolt standard since
~1994. <F1554 standard tensile strength ratings are 36, 55, and 105 ksi.
<Matt
<KM5VI
## It's actually YIELD strength, not tensile strength.
I used 105 ksi (red on top) on my HDX-689 12 x anchor bolts. I ordered em
from Portland Bolt. I had em custom made, 60" long (instead of 36"), with 6"
of thread on each end of each rod. 9" square plates used on the bottom of each
group of 4 x anchor rods..which increases pull out capacity through the roof.
## The 55 + 105 ksi anchor rods don't cost much more than the 36 ksi rods. I
had em made longer since it seemed a bit silly to have a 9' deep hole, filled
with 35 mpa concrete (5075 psi)..and another 5" of concrete above the
lawn...... then only use 36" long rods. But that also required using more
horizontal braces, since UST wants a brace every 6", till you get to the bottom
of the anchor rods, then 1' after that.
Jim VE7RF
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