Studs are rods with threads on both ends. Most often, the threads on one end are coarse while the other end has fine threads. One end of the stud is screwed into a threaded bore. A hole in the part to be secured is fitted over the stud and held in place with a nut that is screwed over the stud. Studs are used when the clamping pressures of a fine thread are needed and a bolt will not work. If the material the stud is being screwed into is soft (such as aluminum) or granular (such as cast iron), fine threads will not withstand a great amount of pulling force on the stud. Therefore, a coarse thread is used to secure the stud in the work piece and a fine-threaded nut is used to secure the other part to it. Doing this results in having the clamping force of fine threads and the hold- ing power of coarse threads.