To perform troublesome work accompanying detachment of a fastening nut for a bolt at a band fastening portion in a suspending band and refastening of the fastening nut as easily as possible.
A circular shaft part 32 having a diameter smaller than a screw part 31 is arranged at a tip end of the bolt 3, and the fastening nut 4 having a nut cap 5 made of a soft synthetic resin fitted and arranged in a female screw hole can be temporarily fixed and held at the tip end of the bolt 3, so as to cover the circular shaft part 32 by a leg part 54 of the nut cap 5 having a cylindrical cross section. As the fastening nut 4 can be pulled out with the nut cap 5 there on and a band piece 1 can be opened, when the band piece 1 is closed after a pipe 6 is received, a top panel 51 of the nut cap 5 is held, and the fastening nut 4 is pushed to the tip end of the bolt 3, the fastening nut 4 can be temporarily fixed and held again, and at that time, if the fastening nut 4 is slightly moved in the direction of a bolt head 34, the fastening nut 4 can be screwed to the screw part 31, so that the fastening portion can be fastened.
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