[TowerTalk] FW: FW: FW: UST bolt Torque question

[Matt]

Oops - I have used the wrong term - not a spud wrench.   I used a hammer
wrench (aka slugging wrench or striking wrench) for the nuts on ASTM F1554
concrete anchor bolts.   

For A325 3/4" diameter shear bolts that fasten the tower to the base I am
using a 1/2" air impact wrench or sometimes a 24" breaker bar.  

For what it's worth - I discovered that John at Superior Bolt in Phoenix, AZ
keeps a good supply of structural concrete anchor bolts in stock and seems
to be very knowledgeable & helpful.   Last time I bought bolts from him the
cost (including delivery charge) was about half of what the tower mfg's
charge for the bolts alone.

Matt
KM5VI

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of K8RI
Sent: Tuesday, June 25, 2013 7:10 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] FW: FW: UST bolt Torque question

On 6/25/2013 7:37 PM, Grant Saviers wrote:
> Great to have some technical specs for "snug tight".  Thanks.
>
> A hammer struck spud wrench?  I would think the spec means a typical 
> tapered spud wrench about 18" long for a 1" bolt.  I'd estimate 
> ironworkers I've met can (easily - no insult intended) apply 80 to 
> 100# force to a wrench so torques in the 100 to 150 ft-lb range might 
> be a numerical range for "snug tight".  IIRC the ironworkers that 
> erected my steel building had a 250 ft-lb target for 3/4" A325 bolts, 
> thus I assume  they are "slip critical" joints. (They used a big torque
wrench).
>

Just don't confuse the two technically precise terms of "snug tight" and
"hand tight" unless tightened by technically certified bolt tighteners/ Iron
workers.

73

Roger (K8RI)

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