| 摘要 |
An exemplary fastener includes a head, a shank extending downwardly from a bottom of the head, and a protruding flange extending outwardly from an outer surface of the shank at a position adjacent to the head. A portion of the shank between the head and the protruding flange is formed a neck. An outer diameter of the protruding flange is varying along an axial direction of the shank.
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