WTB: 5/16 fully threaded 4" bolt

#1
Where can I find a bolt in this size and fully threaded? Looking for a 4" fully threaded 5/16 bolt. Preferably a 3 1/2 Allen head or a 4" hex head will work too.
 
#9
McMaster-Carr; 5/16-18 p/n 91251A597 3.5" long or 5/16-24 p/n 91251A395 3.5" long
These are partially threaded but would be easy to thread the remaining portion. Oh, these are allen head bolts.
 
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