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expansion bolt

noun, Building Trades.
1.
a bolt inserted into a hole drilled in masonry and mechanically expanded to serve as an anchor for shelves, timbers, etc.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for expansion-bolt

expansion bolt

noun
1.
a bolt that expands on tightening, enabling it to be secured into an unthreaded hole
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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