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Fiche 1,  Justifications,  Anglais

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"screw threads": Continuous helical ribs on a cylindrical shank. ... If a single helical groove is cut or formed on a cylinder, it is called a single-thread screw. Should the helix angle be increased sufficiently for a second thread to be cut between the grooves of the first thread, a double thread will be formed on the screw. Double, triple, and even quadruple threads are used whenever a rapid advance is desired, as on fountain pens and valves. The helices on a double thread start 180° apart, while those on a triple begin 120° apart.  1, fiche 1, Anglais, - triple%20thread

Fiche 1,  Justifications,  Français

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Un filet triple est formé de trois saillies hélicoïdales amorcées à 120 ° d'intervalle, dont le pas égale la triple distance axiale entre trois filets consécutifs.  1, fiche 1, Français, - filet%20triple

Record number: 1, Textual support number: 2 CONT

vis à filets triples.  1, fiche 1, Français, - filet%20triple

Fiche 1,  Justifications,  Espagnol