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RE: half height steel nuts

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I’m not sure that I have your detail clearly in mind, but I’ll describe what I’ve done to join rods in tension.  


When handling 2 rods joined with a coupling not, you’ll observe that there is a little bit of looseness in the longitudinal direction.  To remove the looseness, I use jamb nuts, one tightened against each end of the coupler.  That pulls each rod toward its end of the coupler so that, before the assembly receives structural tension, the threads are already in bearing.  In that case, I would assign no load to the jamb nuts.


It’s a good idea, using half-height nuts as jamb nuts – I’ve not done that.  Are they less costly than standard nuts?


Nels Roselund, SE

South San Gabriel, CA


From: Eli Grassley [mailto:elig(--nospam--at)]
Sent: Wednesday, November 16, 2005 11:15 AM
To: seaint(--nospam--at)
Subject: half height steel nuts


Listers –

I am trying to research design capacities for some half-height “jamb nuts” for use with connecting some A36 threaded rods in tension.  I would assume that you could conservatively take 1/2 the allowable tensile strength in the threaded rod as the half-height nut capacity (because obviously a standard height nut can develop the full rod capacity).

Can anyone point to a text resource that might give me some nut capacity formulas or, really just something to back up my simple argument.

thank you



Eli S. Grassley, PE

PSM Engineers