To provide a torque regulating type tightening bolt capable of tightening by regulated torque, even in the case retightening is necessary after tightening once by the regulated torque and in the case main tightening is performed after once temporarily tightening.
In this torque regulating type tightening bolt 5, provided with a breakaway part 52 in a bolt head part 51, the breakaway part 52 has an inner side tightening head part 52b provided with a stress concentration part 52a integrally connection secured with the bolt head part 51 and an outer side tightening head part 52d provided with a stress concentration part 52c integrally connection secured with this inner side tightening head part 52b, the stress concentration parts 52a, 52c are ruptured by prescribed torque, also the prescribed torque leading to a rupture is decreased small as the part goes to the stress concentration part 52c in an outer side.
KASHIWAGI TAKAHITO
KANDA NORIAKI
URUSHIYAMA HIROSHI
ASAHI ELECTRIC WORKS LTD
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