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.

expansion bolt

noun

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

Example Sentences

The climbs have expansion bolts drilled in at regular intervals to which the rope can be clipped.

From The Guardian

Fasten the Tungar to a wall by four screws, if the wall is of wood, or by four expansion bolts if it is made of brick or concrete.

From Project Gutenberg

For fastening any sort of work to stone or brick the clever expansion bolt, patented and manufactured by Isaac Church, of Toledo, is, on every count, the best device to specify.

From Project Gutenberg