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RE: washers req'd?

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Caution. The rod material is likely weldable, but the nut material is likely
not. You are also likely to have a poor fusion between bolt and nut at the
threads. Better to use a mechanical method - "ding the threads" - if you
think there is truly a need for this.

Bob Shaw
SSTC

-----Original Message-----
From: David Topete [mailto:davetopete(--nospam--at)yahoo.com] 
Sent: Wednesday, December 15, 2004 4:21 PM
To: seaint(--nospam--at)seaint.org
Subject: Re: washers req'd?

Thomas,
Thanks for the reply.  I wonder, however, if that
reference is applicable as these bolts are standard
A307 L-bolts, embedded in masonry.  Either way, if
necessary, I'm sure the contractor won't find too much
issue with a tack weld or two.
David
--- THunt(--nospam--at)absconsulting.com wrote:

> David,
> 
> The requirements for washers are shown in the
> "Specification for 
> Structural Joints Using ASTM A325 or A490 Bolts"
> (RCSC) Section 6.0 "Use 
> of Washers".  If you are truly putting in a slotted
> connection for 
> movement then you should back off the nut 1/16 inch
> and either double nut, 
> stake the threads, or tack weld.
> 
> Thomas Hunt, S.E.
> ABS Consulting
> 
> 
> 
> 
> 
> David Topete <davetopete(--nospam--at)yahoo.com> 
> 12/15/2004 11:54 AM
> Please respond to
> <seaint(--nospam--at)seaint.org>
> 
> 
> To
> SEAINT List <seaint(--nospam--at)seaint.org>
> cc
> 
> Subject
> washers req'd?
> 
> 
> 
> 
> 
> 
> Hi all...  Are washers required at all connections
> where a bolt head/nut is bearing against a steel
> plate?  My situation is a steel stitch plate that
> will
> provide vertical shear transfer across a masonry
> expansion joint.  Holes are slotted along one line,
> but wouldn't having washers defeat the purpose of
> the
> slotted hole, even with a "snug-tight" connection? 
> Mr. Carter, any thoughts?
> TIA.
> David Topete, PE
> SF, CA
> 
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