Abstract
In this paper, the choice of the suitable tightening control method for high strength bolts is investigated. At the first part of this study, the large scale experiments are performed about the torque coefficient in tightening with high strength bolts and nuts. As the result, the significant effects are recognized, in the nominal diameter and the lubricant for the mean of torque coefficient, and in the surface treatment for the scatter of torque coefficient. Nextly, taking account of the above mentioned results, various tightening control methods are compared with each other. It is found that a torque control method in which a target value of tightening torque is determined on the basis of the torque gradient control method may be an effective tightening method.
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