Find Self-drilling lag screws at Lowe's today. What is a lag screw? What are they used for? How do they differ from regular screws? Sep 21, 2022 · A screw drives into wood, while a lag screw is designed for use in masonry or other hard surfaces. Their more common “bolt” designation comes from the fact that they have a hexagonal head meant to be tightened with a socket wrench. A lag screw's ability to resist "pull out" or withdrawal far exceeds that of a common screw or nail. Dec 8, 2025 · Master how to use lag screws in wood for robust, long-lasting structural connections. Lag screws, also known by some as lag bolts, are heavy-duty fasteners designed to connect larger pieces of wood or to fasten wood to metal or concrete. To install a lag screw, first you have to align the materials you're going to screw together. Nov 12, 2025 · Learn to select the correct lag screw size and material for structural wood connections. Simplicity is part of their success; they don't need nuts. In this comprehensive guide, we’ll delve into everything you need to know about lag screws, from their standard sizes and dimensions to selecting the right material and proper installation techniques.

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