| 摘要 |
A connection between a metallic threaded fastener having a threaded portion and a part of plastic material having a bore, the threaded portion forming or tapping a counter thread into the wall of the bore, characterized in that for a predetermined number of threads, the entrance portion of the bore is provided with a circular shaped or arc shaped inclined cam surface which encircles the bore helically and which forms a step between the ends of the cam surface or the associated ends of adjacent cam surfaces, respectively.
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