| 摘要 |
PROBLEM TO BE SOLVED: To provide a blind rivet type female screw anchor capable of surely preventing corotation of a female screw anchor main body when performing a mounting work and after the mounting for even a fragile plate such as a gypsum board and standing large screwing torque. SOLUTION: In the blind rivet type female screw anchor for breaking a reduced diameter part 43 for cutting after a head part 42 deforms an expanded piece 26 so as to push and expand outward by rotating a shaft-shaped body 41 which has the reduced diameter part 43 formed in the vicinity of the head part 42, is constituted of a mandrel 40 provided with a male screw 45 screwed onto a female screw 24 on an outer peripheral surface of the shaft-shaped body 41 and extends to a flange part 22 side and pulling the shaft-shaped body 41 from the body part 21 by a feed action of the female screw 24 and the male screw 45, an outer peripheral surface of the flange part 22 is formed into a non-circular shape, an outer diameter of an expanded diameter cylindrical part 23 is formed so as to be smaller than an outer diameter of the body part 21 and thickness of the expanded piece 26 is formed so as to be thinner than that of the body part 21.
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