Fastener, male-screw-side member, and female-screw-side member

Abstract

To provide a fastener capable of shortening the time required for fastening.SOLUTION: A fastener comprises: a male-screw-side member having a screw part 11 where male screw surfaces 12A, 12B with a male-screw-side screw thread 12 formed thereon and outer circumferential pieces 13A, 13B without the male-screw-side screw thread 12 are disposed alternately; and a female-screw-side member 20 having a screw hole 21 where female screw surfaces 22A, 22B with a female-screw-side screw thread 22 formed thereon and inner circumferential pieces 23A, 23B without the female-screw-side screw thread 22 are disposed alternately, so that the male screw surfaces 12A, 12B and the female screw surfaces 22A, 22B can be screwed together. The male-screw-side screw thread 12 is formed such that a width thereof in an axial direction of the screw part 11 increases from the front to the rear in a direction of relative rotation in screwing the male screw surfaces 12A, 12B and the female screw surfaces 22A, 22B together. The female-screw-side screw thread 22 is formed such that the width thereof in the axial direction of the screw hole 21 decreases from the front to the rear in the direction of relative rotation.SELECTED DRAWING: Figure 1

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