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We have devised new bolt fasteners based on an innovative double thread mechanism composed of a coarse single thread and coarse multiple threads (called DTB-II). In order to improve the rolling formability and the strength, the screw-thread of the DTB-II was fundamentally modified in this study. The number of multiple threads was reduced by one from the 3thread DTB-II (called 3-1thread DTB-II). The...
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