Stud

Studs can be recognized by their fully threaded ends and an unthreaded middle section of the shaft. Bolts are best described as long shafts and are generally only partially threaded. While a stud requires the use of a nut screw to increase or loosen tension between the parts it holds together, the bolt has a distinct flat head on one side. In order to loosen or increase the applied tension in an assembly fastened by a bolt, the technician needs to utilize a screwdriver or a wrench.