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Re: Double Nuts on Anchor Rods

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The only reference to double nuts in the referenced source appears to be that of the embedded nuts for QT rods (I may have been looking not thoroughly enough).  According to AISC Manual "Column Base Plates", it is generally "better to spike the threads of double nuts than to use lock washers."  That manual also indicates that "use of lock nuts on anchor bolts is rarely justified" and the split-ring washers are"ineffective."
IMO, "Spiking" ("staking") can be easily specified and implemented, and may represent the only practical and almost fool-proof way to assure the long-term intactness of the bolted assembly. 
Steve Gordin SE
Irvine CA
----- Original Message -----
Sent: Thursday, January 12, 2006 9:18 AM
Subject: Re: Double Nuts on Anchor Rods


Yes, double nuts are often used for vibrating equipment and tall vertical vessels anchor bolts.  I do not have a copy in front of me but you might want to look at ASCE, "Wind Loads and Anchor Bolt Design for Petrochemical Facilities".

Thomas Hunt, S.E.

"Ken Peoples" <kspeoples(--nospam--at)>
01/12/2006 07:35 AM
Please respond to seaint
        To:        "Seaint" <seaint(--nospam--at)>


        Subject:        Double Nuts on Anchor Rods


When we are doing structural steel detailing, we sometimes see double nuts on anchor rods - especially for industrial work.  I am curious if any of you know of any particular recommendations from AISC (or any other authority) regarding using double nuts for anchor rods.  I often see them where there are vibrations (screens), cranes, towers or stacks.
Best regards,

Kenneth S. Peoples, P. E.

Lehigh Valley Technical Associates, Inc.
1584 Weaversville Road
Northampton, PA 18067

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