[TowerTalk] Long Tangent U Bolts

Grant Saviers grants2 at pacbell.net
Tue Apr 11 11:37:44 EDT 2017

Bending threaded rod has risks - the Zn film will be damaged whether 
plated or hot dip and the V threads then become a likely spot for 
crevice corrosion.

Also, the minimum diameter of the threads is less than the stock 
diameter so the "U-bolt" is weaker in the U than commercial u-bolts with 
full diameter stock.  Whether that matters vs the normal threaded part 
of the U-bolt depends on the stress distribution created by whatever is 
being clamped.    In my  experience, "all-thread" from your local big 
box may not even be grade 3 steel.

Far better I think to use SS or HDG graded bolts and saddles both sides, 
back to back, or plain flat plates for square stock clamping.  Machining 
split collars is another option and used by JKantennas for their 4" boom 
large yagis.

While SS does look nice, HDG fasteners last a long time as others have 
mentioned and doesn't gall.  HDG is generally preferred in commercial 
tower construction.  An exception would be salt spray exposed locales 
but then 316 stainless or better is needed.

Grant KZ1W

On 4/11/2017 6:49 AM, Rob Atkinson wrote:
> What about buying and cutting and bending threaded rod to make your own?
> Not sure if the threading and bending will weaken the U though.
> Rob
> K5UJ
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