Spreizdübel

Spreizdübel, often translated as expansion anchors or toggle bolts, are a type of fastener used to secure objects to solid or hollow materials such as concrete, brick, or drywall. The fundamental principle behind a Spreizdübel is that it expands when a screw is driven into it, creating a secure grip within the base material.

There are several common types of Spreizdübel. For solid materials, a common design features a metal sleeve with internal threads. As a screw is tightened, it pulls a cone-shaped nut upwards, forcing the sleeve to expand outwards and wedge itself into the surrounding material. For hollow materials like drywall, toggle bolts are frequently used. These have a spring-loaded wing that folds to pass through a pre-drilled hole and then springs open behind the drywall, providing a large surface area for support. Other variations include plastic anchors, which expand as a screw is inserted, and sleeve anchors, which are a more robust metal option for heavier loads.

The selection of the appropriate Spreizdübel depends heavily on the type of base material, the weight of the object being attached, and the environmental conditions. Incorrect application can lead to failure, either by the anchor pulling out or by damaging the base material. Proper installation, including using the correct drill bit size and ensuring the anchor is fully seated, is crucial for reliable performance. Spreizdübel are widely used in construction, DIY projects, and various industrial applications for their ease of use and effectiveness in creating strong, load-bearing connections.