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.
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World English Dictionary
expansion bolt
 
n
a bolt that expands on tightening, enabling it to be secured into an unthreaded hole

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Expansion bolt members to concrete unless shown otherwise.
Provide stainless steel expansion bolt fasteners as detailed.
Use toothed steel or expansion bolt devices for drilled in place anchors.
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