The dowel types at a glance

Although most people think of dowels as the widespread expansion dowel, there are many types of dowels. We have summarized here for you which important anchor types are distinguished and when they are used:

Today, different kinds of dowels are needed

The aforementioned plastic expansion dowel has long been something of the all-purpose dowel. It is particularly suitable for solid masonry. However, there is also the problem here: since the 1990s at the latest, apartments and houses are being upgraded with drywall elements.

This applies equally to ceilings and walls, sometimes even to floors. Therefore, the wide selection of different types of dowels is more important today than ever before. Here are the most important dowel types:

  • Expansion dowel, made of plastic
  • Cavity dowels made of metal
  • Spring-loaded dowel (also a cavity dowel)
  • Knot dowel for aerated concrete (aerated concrete)
  • Screw anchors (for concrete)
  • insulation fixing
  • Plasterboard plug
  • Impact anchor (concrete)
  • Injection dowels (chemical dowels)

The former all-purpose dowel - the plastic expansion dowel

Everyone knows expansion anchors made of plastic. Often they are included as accessories in components such as light switches and other components, although they are hardly ever used. By screwing in the screw, these dowels spread and anchor themselves. The load capacity varies according to the dowel size.

hollow wall anchors

Metal cavity fixing

The cavity dowels are probably the most important dowel types today. They are also available in different varieties. Once similar to the expansion dowel, except that here the round cut sleeve shrinks when screwing in the screw and spreads star-shaped outward.

The spring clip

In contrast, the spring-loaded dowel is inserted. Then two wings are unfolded in the cavity. This anchor is also suitable for heavy loads and is used in drywall applications.

Knot dowel for aerated concrete

These dowels are also expansion dowels, only that they spread over a large area to find support in slightly sandy aerated concrete.

Insulation and plasterboard dowels

However, there are also special plasterboard dowels that cut into the plasterboard. For this they are equipped on the outside with a helical thread. These dowels are suitable when less heavy parts such as images are to be attached. The insulating dowel looks similar and thus follows the same fastening principle. However, these dowels are significantly longer. They can be used in various insulation boards such as polystyrene or PUR insulation boards.

in anchor

Impact anchors are driven with a special tool into boreholes in natural stone or concrete. Thereby they spread themselves.

A threaded insert

But you will need more and more often by so-called screw plugs or concrete screws an exactly pre-drilled hole. Then they are screwed in, because they are equipped with a special cutting thread. These are heavy-duty dowels.

injection anchors

Injection dowels, also known as chemical dowels, are also heavy duty dowels. They consist of three parts: the anchor sleeve, the threaded anchor and the synthetic resin mortar. Depending on the surface, the anchor sleeve is first inserted or not (when the anchoring sleeve is first inserted, we have summarized under "Embedding the anchor" for you).

Then the resin mass is injected into the wellbore. The thread anchor is now inserted and centered or aligned. Within one hour, the resin composition hardens completely and the dowel can be loaded.

Tips & Tricks

Just as important as the dowel type is the drill hole for the dowel. If you follow this link, you can read how to drill the borehole according to the existing subsoil.

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