Under no circumstance would I use grade 2 bolts for any application on
antenna or Tower.
If you cannot find what you want, send me an e-mail as I have parts Hot
frequently, and could get some done for you at a good price.
73 de Rich K0XG Manufacturer of hardware for rotating towers.
On 03/19/99 16:42:30 you wrote:
>I have quite a few straight sections of tubular tower (made by an
>obscure manufacturer who has long been out of business) that
>I want to put up this year as a guyed tower. I am lacking the
>bolts for the joints.
>I am interested in using galvanized hardware, as Rohn does, because
>it doesn't require lockwashers and seems in general to be pretty
>impervious to vibration.
>I have two, related questions for this group.
>First, does anyone have any favorite sources for galvanized
>Specifically what I need are 0.5 x 2.5 inch bolts, any thread
>I know about Rohn and McMaster-Carr. Others?
>My second question has to do with the necessary strength of the
>The tower will be 160', guyed four times. The legs are similar to 2
>schedule 40 water pipe, and the tower has a 24 inch face. There are
>two bolts per leg, like Rohn 45, with each section being 10 feet
>The tower terminates with a oversized sleeve that slips over the
>section below, just like Rohn 45-ish tower.
>McMaster-Carr does have grade 2 galvanized bolts in their catalog.
>Tensile strength is listed as 74,000 psi.
>I realize that this is not ideal, and that something like grade 5
>be better. But the half inch bolt is also quite a bit bigger than
>other tower joint bolts I see.
>Can I get the grade 2 bolts, or should I keep looking? I assume
>the only concern is having the bolts shear. Compression failure
>doesn't seem like a problem, given the joint overlap.
> - Pat
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