[TowerTalk] FW: Rohn anchor bolts, grade?

[maflukey at gmail.com]

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 at contesting.com> On Behalf Of jim.thom jim.thom at telus.net
Sent: Monday, April 04, 2022 11:36 AM
To: towertalk at contesting.com
Subject: [TowerTalk] Rohn anchor bolts, grade?

Date: Mon, 4 Apr 2022 09:30:03 -0500
From: <maflukey at gmail.com>
To: "'WW3S'" <ww3s at zoominternet.net>, "'Jon Zaimes, AA1K'"
        <jz73 at verizon.net>
Cc: <tommy at k6ye.com>,   <TowerTalk at 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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