S.W.G.

standard wire gauge.

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British Dictionary definitions for swg

SWG

noun

Standard Wire Gauge; a notation for the diameters of metal rods or thickness of metal sheet ranging from 16 mm to 0.02 mm or from 0.5 inch to 0.001 inch

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