A threaded rod is a relatively long rod that is threaded along the complete length of the rod. Threaded rod in bar stock form is often called all-thread. A stud is a relatively long rod that is threaded on both ends. The threaded rods/studs are designed to be used in tension. Studs may have a drive slot in one end to facilitate installing the stud. A threaded rod/stud is used where high stress is involved.