| 摘要 |
PROBLEM TO BE SOLVED: To provide a screw with a falling preventive function favourable in cost reduction and assembling by eliminating falling preventive parts and complicated work to install them. SOLUTION: This screw is constituted to prevent falling by providing a screw shaft part 131 continued to a screw head part 13, forming a non-threaded small diametrical part 15 on an intermediate part of the screw shaft part 131, constituting a screwing part 14 on the side of the screw head part 13 and a screw hooking part 16 on the head end side by separating them, providing a pair of stepped parts 15a, 15b between the screwing part 14 on the non- threaded small diametrical part 15 and the screw hooking part 16 and hooking these stepped parts 15a, 15b in a screw hole on the side of a fastening member.
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