Fischer dowels: The right dowel for every building material

The right dowel for every building material

Regardless of whether a washbasin, a satellite system or a new awning must be fastened - which dowel is the right one depends on various criteria: Substrate, load per dowel, working length, type of mounting and possibly requirements for corrosion protection should be known to select the attachment.

screw length

Fischer dowels: The right dowel for every building material: dowel

Dowel Snake

Often it happens that while dowels and screws are at hand, but both do not fit together.

Be with screws used to small diameters, the attachment holds less, To large screw diameters require more power when screwing in and thus unnecessarily more time. For optimum holding values, it is therefore essential to observe the manufacturer's instructions on the dowel pack.

Equally important is the choice of the right screw length. The screws should project beyond the dowel tip by the length of the screw diameter.

It must not be overlooked that Tiles, plaster or insulating materials are not wearing layers are. A secure anchoring must take place in the underlying building material. The optimal screw length can be easily determined:

Minimum screw length

Fischer dowels: The right dowel for every building material: dowel

Wall section

= 1 x screw diameter

+ Anchor length

+ Thickness of the plaster and / or insulating material

+ Thickness of the assembly item

drill strength

But with which drill bit thickness must be drilled for which dowel size?

Mostly: The anchor diameter corresponds to the drill diameter, In aerated concrete and other very soft building materials, however, it is better to drill the hole 1 mm smaller. The dowel gets so a better load capacity.

Fischer dowels: The right dowel for every building material: dowel

Dowel selection - underground

Decisive for the Dowel selection is the undergroundto which something is to be attached. The softer and holier the wall, the longer and thicker dowels and screws should be chosen. For unpainted masonry, the Wall texture determined by the stone shape and color become. If the wall is plastered or clad, a test hole will help. Depending on the progress of drilling and the color of the drilling dust, the anchorage can be determined.

Perforated bricks, low strength building materials and Portenbeton should only in the rotation to be drilled (without impact) - even if it is different faster. In the case of perforated bricks, there is otherwise the danger that the webs in the building block will be destroyed and the dowels will later find little support.

Also the Thorough cleaning of the drill hole is important for the safe hold of the Dübel, since these only in one clean borehole maximum holding values achieve. Boreholes can be brushed or vacuumed or blown out with a vacuum cleaner or blower.

When choosing the right dowel, depending on the building material, loads and installation, there are five types of fixing: General fixings, cavity fixings, frame fixings as well as heavy load and injection fixings, which also include the composite anchors.

expansion anchor

expansion anchor long considered the standard dowels. In solid building materials like Concrete, solid brick and limestone ensure optimal hold.

The classic among the expansion anchors is the S-Dowel by fischer. In 1958 he came as the first nylon plugs on the market. Today it is the most produced (and most copied) dowel in the world.

This topic has been developed for you by in cooperation with Fischerwerke.

Contact Fischerwerke Artur Fischer GmbH & Co.KG

Weinhalde 14 - 18 72178 Waldachtal

Tel.: 07443 / 12-0 Fax: 07443 / 12-4222

Email: [email protected]


picture sources

all pictures: © fischer Unternehmensgruppe.

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