Mountz, Inc.
www.mountztorque.com
THE IMPORTANCE OF TORQUE CONTROL? The reliability of machine parts subjected to fluctuating loads and stress depends on the fatigue strength of the materials. A threaded fastener, however, relies upon an elastic interaction between the mating components. Its objective is to clamp parts together with a tension greater than any external force trying to separate them. The bolt then remains under almost constant stress and is immune to fatigue. If the initial bolt tension is too low, the fluctuating load in the shank in much greater and it will quickly fail. Reliability, therefore, depends on correct initial tension and is ensured by specifying and controlling the tightening torque. TORQUE TOOLS Torque is simply defined as a measurement of turning or twisting force applied to an object. Every day, screwdrivers, wrenches, impact tools and even hammers are used to apply torque on assembly lines to create the tension required to clamp bolts, screws and other fasteners firmly together. However, none of these tools can assure that proper tension is being achieved. A manufactured product's quality and integrity are completely dependent upon the reliability of fasteners and the elastic interaction between the mating components. The objective is to clamp parts together with a tension greater than any external force trying to separate them. The part then remains under constant stress and is immune to fatigue. An inadequately torqued fastener can vibrate or work loose; conversely, if the tension is too high, the fastener can strip its threads. Faced with these options, manufacturers are realizing that torque control could spell the difference between a safe, reliable and economical product and complete disaster.
The precise control of torque is a key to a quality assembly and can ensure that products
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