[TowerTalk] UST bolt Torque question

[Grant Saviers]

Jim,

When I asked UST for the torque on my HDX589s, the answer I got was 
"what a man can apply with a standard wrench." Very techie, those UST 
engineers!

I used a torque wrench set for 140 ft-lbs (w/o lubrication) for 
everything, about 1/5 of what Portland Bolt specifies for the leg bolt 
grade/size.  I found it took 3 cycles to get all leg bolts about the same.

Grant   KZ1W


On 6/25/2013 5:39 AM, Jim Thomson wrote:
> I asked UST  how much Torque should be used on both the 12 x  1.125 inch anchor rods....and also the 18 x  1 inch leg bolts.
> I also told em I used never seize on both anchor rods and legs bolts.  Also told em the anchor rods are 104 ksi yield strength..and
> came from portland bolt...and are 60 inchs long each.... with 6 inch threads on each end.   Told em that the 18 x leg bolts are
> A325 bolts and are 3 inchs long each.    Everything has heavy duty flat washers and slightly oversized nuts on em.
>
> Their reply was...... snug fit !    This is for my UST  HDX-689 tower.  This is the old style 689..that weighs 5000 lbs..without the ants and mast, but that
> weight includes the bearings  and small  PP  rotor.   The crane operator weighed the tower when it was unloaded.
>
> What is  ..snug fit ?     Trying to get  answers from UST at times can be exasperating.
> Does anybody even know ?    I was thinking  perhaps  125 ft lbs for the anchor rods......and 100 ft lbs for the leg bolts.   Leg bolts can always be replaced...
> anchor rods cant.
>
> Tnx...  Jim   VE7RF
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