What Is a Lag Screw?

Lag Screw is a heavy duty fastener used to connect wood or other materials that bear an intense load. Unlike standard wood screws or sheet metal screws, lag bolts have sharp gimlet points and coarse threading that extends to the top (in longer lengths). Due to their larger diameter, lag screws require a pre-drilled hole for installation.

The hex head of the lag screw allows it to be driven using a wrench or hex driver, making them ideal for use when a high level of torque is needed. Lag screws are manufactured from low carbon steel and are available in a variety of sizes and thread pitches to suit your specific application.

When installing lag screws, it is important to ensure that the materials being fastened are properly aligned. For best results, clamps should be used to hold the materials in place until the lag screw is installed. A pilot hole should be drilled before the lag screw is installed, and it should be slightly smaller in diameter than the actual screw.

Lag screw fixation provides superior stability compared to other fixation techniques and can be used in a wide range of craniofacial situations. It is particularly useful for oblique and spiral fractures of the mandible where compression is required. When the lag screw is placed perpendicular to the fracture plane, it can effectively compress large fragments of the multifragmentary fracture in order to stabilize them. In these cases, early and effective bone reunification is achieved resulting in decreased morbidity and improved function. Lag Screw

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