toggle bolt

noun
an anchor bolt having two hinged wings, ordinarily held open by a spring, for engaging the rough sides of a hole drilled in masonry or the inner surface of a hollow wall.

Origin:
1785–95

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
toggle bolt

noun
a fastener consisting of a threaded bolt and a hinged spring-loaded toggle; used to fasten objects to hollow walls 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Anchor flanged fitting with toggle bolt to steel support in frame walls.
Even a toggle bolt can pull through the wall sheathing if the demands are sufficient.
Toggle bolt to hollow masonry of frame wall installed support.
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