| 摘要 |
PROBLEM TO BE SOLVED: To provide a coming-off prevention washer capable of dispensing with a deformable material, and not needing a large accommodation space with a simple constitution.SOLUTION: An inner peripheral face of a through hole 12 of a washer 10 is composed of a non-female screw portion on which a female screw is not formed. The non-female screw portion has a small-diameter portion 16 fitted between thread portions of a male screw portion of a screw member for preventing linear movement in a center line direction of the through hole 12 to the thread portion, and a large-diameter portion 14 permitting movement in a twisting direction over the thread portion of the male screw portion, of the screw member in being twisted around a center line O of the through hole 12, and having a diameter larger than the small-diameter portion 16.SELECTED DRAWING: Figure 1 |
