[TowerTalk] mast for two big antennas

[Jim Lux]

On 12/27/12 10:51 AM, Mike Ryan wrote:
> I'm not a metallurgist either. I might have been sold chain link fence
> railings, but whatever it was I dragged up 160ft in the air, it work
> pretty well. I just googled 4130 and found the text below. All I can
> tell you is what I recall from memory of events of nearly 20 years ago.
> Your results may vary, good luck, good dx/  -M
>
> 4340 (chromoly) Normalized Alloy Steel
> Minimum Properties Ultimate Tensile Strength, psi 186,000
> Yield Strength, psi 125,000
>
That's for 4340, not 4130.. Different alloy and all..