[TowerTalk] Rohn anchor bolts, grade?

[maflukey at gmail.com]

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

-----Original Message-----
From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of WW3S
Sent: Monday, April 4, 2022 9:19 AM
To: Jon Zaimes, AA1K <jz73 at verizon.net>
Cc: tommy at k6ye.com; TowerTalk at contesting.com
Subject: Re: [TowerTalk] Rohn anchor bolts, grade?

Yep, 1/2x12bb are the ones……grade 36 ?

Sent from my iPad

> On Apr 4, 2022, at 10:16 AM, Jon Zaimes, AA1K via TowerTalk <towertalk at contesting.com> wrote:
> 
> Tower hasn't been specified but for Rohn 25 there are two bases that may be bolted to the concrete.
> BPH25G is hinged base for bracketed or guyed towers. It uses 1/2" 
> bolts but the engineering diagram doesn't give any details: 
> https://static.dxengineering.com/global/images/technicalarticles/roh-b
> ph25g.pdf Rohn part number is 1/2X12BB: 
> https://www.dxengineering.com/parts/roh-1-2x12bb
> 25GSSB is base plate for self-supporting towers. It uses 5/8" bolts. 
> Engineering diagram doesn't specify grade per se but gives shear and 
> tension specs: https://www.cableandwireshop.com/manuals/25G-17.pdf
> Rohn part number is 5/8X12BB: 
> https://www.dxengineering.com/parts/roh-5-8x12bb
> Rohn concrete base BPC25G has single center hole for pier pin.
> 
> 73/Jon
> Jon P. Zaimes, AA1K Tower climber for hire http://www.aa1k.us/ Cell: 
> 302-632-2353email: jz73 at verizon.net or aa1k at arrl.net
> 
> -----Original Message-----
> From: tommy at k6ye.com
> To: TOWERTALK at CONTESTING.COM
> Cc: TOMMY at K6YE.COM
> Sent: Mon, Apr 4, 2022 12:45 am
> Subject: Re: [TowerTalk] Rohn anchor bolts, grade?
> 
> The bolts should be listed on the "Tower Engineering Sheets" AKA 
> "Structural Analysis Sheets." Tower Typical Standards are bolts 
> designated as ASTM A325 which corresponds to Grade 5, while ASTM A490 
> corresponds to Grade 8.
> 
> I hope that helps.
> 
> Semper Fi,
> 
> Tommy - K6YE
> DX IS and CW RULES
> 
> 
>> On 2022-04-03 17:06, john at kk9a.com wrote:
>> I am not sure what a Rohn anchor bolt is, usually the tower either 
>> sits on top of the concrete with a pier pin or a tower section is 
>> embedded in the concrete. FWIW, most structural bolts are hot dipped 
>> A325.
>> 
>> John KK9A
>> 
>> WW3S wrote:
>> 
>> Grade 8, grade 5 , what?
>> 
>> Sent from my iPad
>> 
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