| 摘要 |
PROBLEM TO BE SOLVED: To provide a connecting screw having no worries about slipping-out in spite of applied slipping-out force. SOLUTION: A second recessed notch groove 7 is located on an upper position of a first recessed notch groove 4 formed at a pointed head portion of a connecting screw body, and is arranged in a vertical direction. Knurled uneven grooves 11 is located on an upper position of a screw thread 2, and are formed in the vertical direction.
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