抄録
Nowadays, various kinds of locking devices are widely used in bolted joints for anti-loosening purposes. The prevailing torque type nuts have been widely developed and used in bolted joints for preventing self-loosening and dropout from bolt. Thus, the standards on prevailing torque type nuts have been specified in JIS and ISO. In this paper, experiments were earned out to measure the tightening and prevailing torque of bolted joints with two types calking prevailing torque-type-nuts. As the result, the bolted joint using the calking biggest nut shows the good performance for preventing the loosening compared with the bolted joints using thread calking type of the nut of which the calking deformation is the biggest, moderate and smaller.
