How to Install a Lag Screw
A lag screw or lag bolt is used to provide a structural connection between two or more pieces of lumber. A lag screw has a ticker shaft than a normal screw or bolt and the threads around the shaft are large and coarse to ensure a heavy grab into the lumber. The screw threads are so strong that if you do not drill a pilot hole through the lumber, the head of the lag screw can snap off due to the excessive torque required to thread the lag screw into the lumber. Does this Spark an idea?
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Instructions
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Hold a drill bit in front of the lag screw. When you find a drill bit that covers the shaft of the lag screw, insert it into the chuck of the drill motor.
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2
Wearing your safety glasses, place the tip of the drill bit against the lumber, where you need to drill the pilot hole for the lag screw.
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3
Drill the pilot hole through the lumber you are securing with the lag screw.
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4
Set the drill motor aside and place a socket onto the ratchet that fits the head of the lag screw.
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Insert the tip of the lag screw into the pilot hole and place the socket onto the head of the lag screw.
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Turn the ratchet clockwise to thread the lag screw into the pilot hole. If the lag screw binds in the hole, reverse the direction of the ratchet. Turn the lag screw counter-clockwise one to two revolutions. Continue threading the screw into the lumber.
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Stop turning the lag screw when the screw's head rests tight to the surface of the lumber. Do not over tighten the lag screw, as you could snap the head from the lag screw.
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