You can find the screw’s dimensions printed in its original box. So, to properly use the chart, you’ll first have to identify the dimensions of your lag screw. Once you’ve familiarized yourself with the parts of a lag screw, you’re ready to read and understand the chart.Īs you can see in the sizing chart below, lag screws typically range from 1/4-inch to 7/8-inch in diameter. Surface of the thread corresponding to the minor diameter of the screw.ĭistance between the crest and the base of the thread. Lower extreme diameter of the thread, also known as minor diameter. Helical structure that runs around the cylinder of the screw.ĭistance between adjacent threads, usually expressed in millimeters. Threadless part of the bolt, situated between the head and the thread. They are similar to general screw size chart characteristics and are as follows: To properly read a lag screw size chart, you first need to familiarize yourself with the basic parts of a lag screw. Here’s how to read a lag screw size chart: Identify the Parts of the Lag Screws Unless stated otherwise, lag bolts aren’t bolts, but rather screws. Lags are usually not used with a nut, so the proper technical term is lag screws rather than lag bolts. Lag screws/bolts are fastened by rotating the head, allowing the screws to solidly penetrate into the material it’s installed in.Ĭarriage Bolts, on the other hand, are fastened into the material with a nut. The terms “lag screws” and “lag bolts” are often used interchangeably.Ĭarriage bolts and lag bolts are also often viewed as the same even though they’re two completely different materials. How to Read a Lag Screw Size ChartĬompared to bolts and nuts, lag screws have a lower lateral strength.įor this reason, they’re used in three main instances: when only one side of the joint is accessible, when a through-bolt length is excessive, or when the addition of a nut is impossible. I’ve also included a full chart of all the necessary measurements you need for your projects. In this article, I’ll show you how to accurately and easily read a lag screw size. If you’re planning to use a lag screw for your next project, you should always check the lag screw size chart to make sure you’re using the right screw size. They’re generally used for wood-to-wood and metal-to-wood fastening. Lag screws are heavy-duty construction fasteners with sharp threading that cover only a part of the bolt, allowing you to adjust them as needed.
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