British Association screw thread
noun
engineering a system of screw sizes designated from 0 to 25. Now superseded by standard metric sizes: Abbreviation: BA
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
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