Threaded rods and studs are fasteners that screw into threaded nuts or tapped holes, allowing for assembly of components. The difference between rods and studs is length: In general, a stud is up to 1 foot long, and a rod is more than 1 foot long. Both have threads along part or all of their length. Those that are partially threaded have equal or unequal thread lengths on one or both ends. Studs are also available with a perforated base, weld projections, or a press-in captive head for securing to the surface of a component.