Abstract: A stud driving tool for use with wrenches or powered equipment for driving threaded studs into threaded holes and for preventing back rotation of such studs during removal of the driving tool from driven studs. The driving tool is provided with a slightly oversized threaded internal bore for receiving the threaded stud on one end and connection means for connecting the tool to wrenches or powered equipment on the other end. A flexible member is provided within the threaded internal bore which serves as a stop member to prevent the stud from bottoming out within the tool's threaded bore. The flexible member is a rolled pin which is slightly resilient or springy but allows sufficient torque to be exerted on the stud to assure it is tightly driven into the threaded hole and also allows the gripped end of the stud to be easily released.