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expansion bolt

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expansion bolt

–noun Building Trades.
a bolt inserted into a hole drilled in masonry and mechanically expanded to serve as an anchor for shelves, timbers, etc.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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expansion bolt  
n.  A bolt having an attachment that expands as the bolt is driven into a surface.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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