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Re: washers req'd?

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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)>

12/15/2004 11:54 AM

Please respond to

SEAINT List <seaint(--nospam--at)>
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?
David Topete, PE

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