| 摘要 |
PROBLEM TO BE SOLVED: To enable control of fastening torque and prevention from being left unfastened with a single bolt by making use of regular fastening tool such as a wrench. SOLUTION: A bolt prevented from being left unfastened comprises a cap 1 and a bolt 2. A head 3 of the cap 1 has a hexagonal shape used for fastening, and a lower portion of the cap 1 wraps a head 4 of the bolt with a hexagonal shape or the like. The bolt is an integrated type bolt in which the cap 1 is firmly fastened onto the bolt 2 by means of press-fitting and insert-molding or the like. The bolt has a structure in which the cap 1 is dropped out when exceeding predetermined torque, and this structure can simultaneously contribute to prevention from being left unfastened. COPYRIGHT: (C)2003,JPO
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