What Is a Lag Bolt?
Lag Bolt are heavy-duty threaded fasteners used to secure materials together in a variety of construction applications. They are a common choice in carpentry projects like decks and outdoor structures and for attaching metal components to wood surfaces, but they can also be found in other types of construction projects including furniture repair, home repairs, and concrete installations (such as wall anchors).
While there is no one-size-fits-all answer to this question, it is generally recommended that you use lag bolts of a length that is twice the thickness of the material you’re trying to connect. This ensures that the bolt will be able to penetrate fully into the wood and will not cause the material to lose strength or integrity.
Before you can determine the right size lag screw for your project, it’s important to know what each part of a lag bolt is and how they work together. The head of a lag bolt is either hexagonal or square and is designed to be driven with a wrench or ratchet. The shank is the portion of the bolt where the threads begin and is tapered to make it easier for the bolt to drive into wood.
The threads of a lag bolt are helically constructed around the shaft of the bolt and provide friction between the fastener and the materials it’s connecting. The higher number of threads on a lag bolt helps to increase the holding capacity compared to other fasteners such as self-tapping screws or drywall screws. Lag Bolt