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What Is the Difference Between Carriage and Lag Bolts?
Because there are so many different kinds of bolts, people often get confused about what the differences are between them. We’ll go over the key differences between carriage bolts and lag bolts in this article, including the shape, function, and size of each bolt type. While carriage bolts and lag bolts have many similarities that make them easy to confuse, there are some key differences that may help you determine if you really need to use one type of bolt versus the other in your home or job site project.
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What exactly are carriage bolts? Carriage bolts are fasteners used to secure a load or an object to a surface. Carriage bolts can have either a hex or square head, but the former is far more common. The hexagonal-shaped head of the hex head carriage bolt is different from the square-shaped head of the square head carriage bolt. Threaded ends on both types of bolts can be tightened with a wrench. One way to tell the difference between these two types of bolts is by looking at the shape of their heads. A carriage bolt, the shape of which can be deduced from what can be seen of its top surface, is hexagonal. It is a square-headed carriage bolt if the top is completely hidden.
Lag bolts, also known as lag screws, are a type of threaded fastener that can be used with either wood or metal and feature a square or hexagonal head. They are typically used to fasten two pieces together by going through the material from one side to the other. In contrast to carriage bolts, which must have a pilot bolt drilled for them before they can be installed, lag bolts can be hammered directly into place. In order to tighten the nut of a lag bolt, you simply turn it until it is as tight as you need it to be. When tightening a carriage bolt, however, you must continue tightening after it has been fully tightened in order for the threads on either end of the bolt to catch and keep it secure. If you forget to do this, your carriage bolt will gradually loosen over time.
Carriage bolts are used to connect two pieces of wood. They are shorter and can be inserted from either the top or bottom. Conversely, steel buildings often make use of square head lags for joining metal sheets. The square head does not allow for rotation when tightened, making them more secure than carriage bolts. Lag bolts are your best bet for a general bolt that can be used in a variety of situations. Because they come with pre-drilled holes, they offer ease of use and installation. The disadvantage is that their heads protrude from the surface, so they may need to be countersunk before installation if you want them flush with the surface. Be sure to purchase the appropriate size for the thickness of the material being attached. Finally, keep in mind that the majority of carriages have angled slots, whereas the majority of lag screws have straight slots.
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