For Rohn 25, the manufacturer recommends 3/8" hot dip galvanized turnbuckles.

Turnbuckles typically have three load ratings:
- working load limit (WLL),
- proof load (2.5 times WLL), and
- ultimate load (5 times WLL)

For Rohn's recommended 3/8" hot dip galvanized turnbuckles, the safe working load is
800 pounds, the proof load is 2000 pounds and the ultimate load is 4000 pounds.
This is a good match to the 4000 pound breaking strength of HPTG4000.

73
Frank
W3LPL

---- Original message ----
>Date: Sat, 29 Nov 2008 09:50:36 -0600
>From: "Dale Martin" <kg5u@hal-pc.org>
>Subject: Re: [TowerTalk] 25 g turnbuckle size
>To: "'Tower Talk'" <towertalk@contesting.com>
>
>
>Interesting question.
>
>I went looking on yahoo.com for 'turnbuckle specifications' to find out for
>myself.
>
>I checked a couple of the sites, Cleveland City Forge and Smith
>Fastener/Chicago Hardware.
>
>Both their specification sheets show that anything smaller than 3/4" has a
>rated capacity less than 5,000 lbs.
>
>The question is: Do you buy a turnbuckle for the same/greater rated
>capacity as your Phillystran or do you buy it for the same/greater rated
>capacity of the tension to which you put the Phillystran?
>
>If the former, then it's 3/4" turnbuckle (5,000 lbs).
>
>If the latter, then it's anything bigger than 1/4" (500 lbs).
>
>I, too, await 'the answers'.
>
>73,
>Dale, kg5u
>
>
>
>
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