A heavy structural wood screw featuring a hexagonal or square head designed for wrench tightening. It has a coarse, widely spaced thread that tapers to a gimlet point, allowing it to bite deeply into timber and provide high pull-out resistance.
Heard on the job
The structural drawings call for three-eighths lag screws on all ledger board connections.
Also heard as
- Coach screw
Do not mix it up with
- Lag bolt: Lag screw is the technically correct term for what tradespeople call a lag bolt.