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WikiPedia: Ốc_vít http://www.mech.uwa.edu.au/DANotes/threads/mechani... http://www.britannica.com/EBchecked/topic/529876 http://www.britishfasteners.com/threads/ http://www.efunda.com/DesignStandards/screws/screw... http://www.efunda.com/DesignStandards/screws/screw... http://books.google.com/books?id=4Q8LAAAAIAAJ http://books.google.com/books?id=A81HmmRCN7YC http://books.google.com/books?id=BPavrOZxCXAC http://books.google.com/books?id=NaZwZK2xm-QC http://www.metrication.com/engineering/threads.htm