A lag screw is a strong, coarse-threaded screw with a hex head that requires a wrench to tighten or remove. It is used for maximum strength and clamping force in projects such as deck attachment or gate fitting. A pilot hole is necessary to avoid splitting the wood, and a flat washer can prevent the head from being sucked into the wood over time. The hex head allows for easy removal and tightens well beyond that of a standard screw. The lag screw is chrome plated or covered in a bright galvanized finish to prevent rust and corrosion.
A lag screw is a large, coarse-threaded screw with a hex head that is used to tighten or remove it. A traditional screw uses a screwdriver to tighten or loosen it, unlike the lag screw, which uses a wrench. Just like a bolt, the lag screw is used in situations where maximum strength and clamping force is required. Projects such as attaching a deck to the wall or foundation of a house typically require the use of screw mount construction. Fitting gates, swing doors, and even garage door tracks are typical uses for the lag.
When using a lag screw to secure an object such as a wooden plank to another wooden structure, a pilot hole must first be drilled through the two planks. The pilot hole allows the lag screw to be threaded through the first board and into the second board without dividing either board. Attempting to drive the lag screw through the first tab without a pilot hole will usually result in a split or cracked tab that will require replacement. It is good practice for individuals to use a flat washer under the head of the lag screw to prevent the head from being sucked into the wood over time.
One benefit of using a lag is that it can be tightened well beyond that of a standard screw. By placing a wrench on the hex head of the lag, the screw can put a tremendous amount of pressure on it without fear of stripping the screw head. The hex head also allows for easy removal even after a long time. Using a wrench instead of a screwdriver also allows for screw manipulation in much tighter areas than where a screwdriver can be used.
The typical bolt or screw is chrome plated or covered in a bright galvanized finish, which prevents rust and corrosion from weakening or breaking the screw. When used with pressure-treated lumber and a time-delayed finish, the average home deck can survive for years with very little maintenance. The great strength of a lag screw also makes the fastener a wise choice when mounting gate hinges to a wooden post. The weight and movement of a heavy iron gate will not release the lag easily. The gate will likely stay tight for years without needing to re-tighten the hinge screws.
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