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RE: Steel Upset Rod

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>upset rods are
>typically used to move the yielding from the shorter threaded portion of
>the rod to the longer rod shank.
Upsetting provides a relatively lower stress at the end of the threads 
which is a major stress concentration. The first fully engaged thread 
transfers a larger portion of the load; consequently most fatigue 
failures in bolts occur at the first thread. The upset end puts the first 
engaged thread in a larger diameter and replaces the re-entrant corner in 
the rod shank with a fillet.

Christopher Wright P.E.    |"They couldn't hit an elephant at
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)

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