Abstract
In our previous study, it was revealed that tightening characteristics of aluminum alloy bolts obviously differ from normal steel bolts. In case using the steel bolt, it is well known that their torque coefficients depend on the tightening speed. An influence of tightening speed on the torque coefficients of aluminum alloy bolt has been investigated in this study. The results showed that the torque coefficients and their scatter bands decreased with an increase in the tightening speed if MoS2 grease and machine oil was used for lubricant of tightening. However if a special lubricant for bolt tightening was used, the torque coefficients did not depend on the tightening speed.
