Improperly tightened bolted joints are often the cause of customer complaints, so the control torque measurement has been added to the control plan. By checking the tightening torque of the bolted joint, we provide an additional checkup and thus reduce the probability of complaints. The value of the control torques differ from the tightening ones, as the conditions in the bolted joint change during the tightening. As part of this thesis we first measured the tightening torques and then the control torques of bolted joints according to one of the methods mentioned in standard VDA 5.2. Measurments of control and tightening torques were compared, and based on them we found that control torques' values are higher than those of tightening torques. We determined the tolerance limits of control torques for each of the measured bolted joints on the product.
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