What, your Harbor Freight torque wrench doesn't have a "Snug" setting?
Don't feel obligated to tighten the mounting bolts in some proportion to
their yield strength or max working torque. Once the "slop" is gone (at
torque values less than 100 lb ft for the hardware in question) additional
tightening really doesnb t help. If it makes you feel better tighten then to
within 1/e of their rated working torque. It won't make the assembly more
robust but it may make you feel better and give you a sense of
accomplishment. For this purpose I have a torque wrench that is about 4 ft
long and is calibrated up to 600 lb-ft .
Patrick AF5CK
-----Original Message-----
From: Jim Thomson
Sent: Tuesday, June 25, 2013 7:39 AM
To: towertalk@contesting.com
Subject: [TowerTalk] UST bolt Torque question
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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