[TowerTalk] Rohn anchor bolts, grade?

[Jon Zaimes, AA1K]

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-bph25g.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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