| 摘要 |
<p>A female screw member (14) is provided with a female thread section (14a) with which a male screw member (2) can be engaged, and also with a circular tube section (14b) coaxial with the female thread section (14a), adjacent to that end of the female thread section (14a) at which the engagement of the male screw member (2) with the female thread section (14a) starts, and formed with a uniform height without forming a screw groove therein.</p> |
