These are custom stainless double end studs we provide our long time customer on a recurring basis, typically with production runs of approximately 300 pcs.  They are made domestically using 304 stainless steel material.  Pictured here is the threaded stud with it's mating part.  The thread on one side measures .875" in length and approximately .687" on the other.  The unthreaded shoulder is 1/2" diameter and the overall length of the stud is set at 2-3/8".