pitch cylinder


noun

an imaginary cylinder passing through, and coaxial with, the threads of a screw so that its intersection with opposite flanks of any groove is equal to half the thread pitch

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What does “Indigenous” mean?
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012