| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a specially finished screw on a screw having a sleeve never to be lost. SOLUTION: In this a screw 10, a screw shaft 13 has a diameter smaller than an outside diameter of a screw crest part range 14, a sleeve 11 has a narrow position inside and a diameter of this narrow position is smaller than the outside diameter of the screw crest part range 14 of the screw 10. Therefore, the sleeve 11 mounted on the screw 10 is never lost.
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