A request was received by the company from a customer to evaluate studs that were backing out during automatic assembly into a hub. The M14 × 1.5 × 90 Double Ended Studs involved in the customer's request were assembled by initially installing them onto a drive socket and then driving them into a threaded hole in the hub. The stud is driven until the shoulder of the stud contacts the hub and a torque of 75 ft-lb (100 N-m) is achieved. The contact between the shoulder of the stud and the hub causes the first thread in the hub to distort creating a locking action between the stud and the top thread of the hub. The assembly tool automatically shuts off when 75 ft-lb torque is achieved. The operator then switches the tool to reverse to disengage the socket from the stud (see Figure 1).
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