LAG SCREW (LAG BOLT)
Description: This looks like a thick wood screw with a hexagonal top. It comes in various lengths, usually from 1 to 6 inches, and either cadmium-plated or galvanized.
Buying information: Lag screws are for fastening wood when regular screws aren't strong enough. They are usually used in the smaller sizes because they have to be turned with a wrench. They are cheaper than machine and carriage bolts described below, so if you have a choice, use them.
How-to hints: Since lag screws are so thick, it is necessary to drill pilot holes for them so that they can be turned more easily. An impact wrench makes turning them even easier.
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