What is a Lag Bolt?
Definition of Lag Bolt in Construction
Fastener that consists of a heavy duty screw thread at one end and a hex head at the driving end.
A lag bolt is designed as a heavy duty fastener for use with larger wood pieces, that are structural in performance and characteristics. The best technique to install a lag bolt is to drill a hole for the bolt that is 2/3’s of the diameter of the bolt. Insert the treaded portion of the bolt into the hole and use the hex head with a socket to screw the fastener into the hole. Normally , if the wood is solid and structurally satisfactory, the fastener will provide an extremely strong and durable connection . The lag bolt is used in situations that require a fastener to bury itself into the material. There is no open end for a washer and nut to be used.