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• lag screw
  lag screw

  noun

  a heavy wood screw having a square or hexagonal head driven by a wrench.
• lag-screw
  lag-screw

  verb (used with object)

  to fasten with a lag screw.

lag screw

¹ American  

noun

1. a heavy wood screw having a square or hexagonal head driven by a wrench.

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lag-screw ² American  

[lag-skroo] / ˈlægˌskru /

verb (used with object)

1. to fasten with a lag screw.

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lag screw British  

noun

1. a woodscrew with a square head

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Etymology

Origin of lag screw

First recorded in 1870–75

Example Sentences

All of the rails should be tenoned into the posts thoroughly, even if the lag screw fastenings are used.

From Mission Furniture How to Make It, Part 2 by Windsor, H. H. (Henry Haven)

Use a 3/8 by 3-in. lag screw, boring the hole in the tenon with a 1/4-in. bit the full depth the screw is to enter.

From Mission Furniture How to Make It, Part 2 by Windsor, H. H. (Henry Haven)