| 摘要 |
A self-clinching fastener is provided, of the type for connection to a section of sheet material having an aperture formed therein for receiving the fastener. The self-clinching fastener comprises a head portion (12) and a shank portion (14) having a smaller outer diameter than the head portion (12) and extending axially from one side of the head portion (12). A displacement portion (22) extends axially from the one side of the head portion (12) extending radially outwardly of the shank portion (14). An undercut annular groove (20) is formed inwardly of the displacement portion (22), extending axially in the direction of the head portion (12) and radially surrounding the shank portion (14). A generally annular sizing ring (28) is formed about the shank portion (14) axially spaced from the one side of the head portion (12) by an amount somewhat greater than the axial extent of the displacement portion (22).
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