lag bolt

[Yespasmn]

a heavy woodscrew with a square or hexagonal head that is driven in with a wrench

[LeeTot 0]

A lag bolt, also known as a lag screw, is a large, heavy-duty fastener with a hexagonal head and a coarse-threaded, sharp-pointed end. It is primarily used for connecting heavy lumber and other materials that carry an intense load. They are typically inserted into a pre-drilled hole and tightened with a wrench.