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[TowerTalk] Bolt trivia

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Subject: [TowerTalk] Bolt trivia
From: (
Date: Thu, 13 Mar 1997 17:25:05 -0500 (EST)
In a message dated 97-03-13 15:24:18 EST, writes:

> Why does Rohn (and presumably other tower manufacturers) spec the tower
>  bolts on their assembly drawings to be "inserted out (i.e. with nuts on
>  outside of tower face)" ?????
>  I have always put the nuts on the inside of the tower so that there is
>  less to snag myself on while climbing the tower.  It seems hard to believe
>  that that strength is affected by which side of the tower the bolt head
>  is on versus the nut!!!!
Terry --

      When you're building a tower, the saying for bolts is that they all go
"up and out".  In other words, the bolts either are installed up or out.  

      While this is an industry practice, I'm not sure of all the reasons.
 You've got to remember that most towers are NOT 25G and 45G.  Many of them
have angle legs and many internal braces.  If you installed the bolts inward
on the angle legs, the ends of the bolts would meet/collide and you wouldn't
be able to get the nuts on them or tighten them very easily.  By putting the
bolts through so they stick "out", lockwasher and nut attachment is easy and
there is no hardware interference.  Any ironworkers out there to shed more
light on this?

     I also install the bolts on 25G and 45G facing in.  I don't think
there's an engineering reason why that's a bad idea.  I don't think it's a
matter of strength, just practicality.

73,  Steve  K7LXC    

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