expansion shield


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expansion shield

[ik′span·shən ‚shēld]
(design engineering)
An anchoring device that expands as it is driven into masonry or concrete, pressing against the sides of the hole.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

expansion bolt

expansion bolts
An anchoring device having an expandable socket that swells as a bolt is tightened into it; used in masonry walls for attaching timber, etc.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.