A lag bolt, also known as a lag screw, is a heavy-duty fastener designed for secure and robust connections in wood or other materials. It features a thick, coarse-threaded shaft and a hexagonal or square head.
The threaded portion of a lag bolt is typically much larger and coarser than that of a standard bolt or screw. This design allows the lag bolt to effectively grip into the material, providing exceptional holding power and resistance to withdrawal forces. The coarse thread helps to provide a strong grip, making it ideal for applications where high load-bearing capacity is required.
Lag bolts are commonly made from steel, stainless steel, or galvanized steel, which provide strength and durability. They are available in various lengths, diameters, and finishes to suit different applications and environmental conditions.
Lag bolts are primarily used for securing heavy objects to wood, such as attaching structural beams, ledgers, or framing members. They are also employed in construction projects, deck building, furniture assembly, and other applications where a secure and long-lasting connection is crucial.
When installing a lag bolt, a pre-drilled pilot hole is typically required to facilitate easier insertion and prevent wood splitting. The pilot hole should be slightly smaller than the diameter of the threaded portion of the lag bolt.
Due to their robust design and gripping power, lag bolts are an excellent choice for applications where shear strength, pull-out resistance, and overall stability are essential. They offer a reliable and durable fastening solution, particularly in wood-to-wood or wood-to-metal connections.