Dimensions of dowel-nails

Great popularity began to use Dowel-nails, If you need to quickly install to the concrete, brick surface. Main plus when working with data fasteners – This is a fast installation, it is enough to prepare a hole, install a dowel in it and score with the hammer.


The design of the dowel-nail is two details – it is a nail and sleeve (dowel). The sleeve has a kind of cylinder made of plastic or steel. On the sides there are spacers, which are spread when installing a nail. Technical characteristics of a dowel-nail Complies with the standards of the GOST, while minor deviations of parameters are allowed – change in diameter, weight, weight, length or fasteners. Dowels made of steel rods, the alloy of which should be resistant to various loads. Hardness Products varies from 54 to 56 HRC (by Rockwell).

Permissible curvature Rod less than 5 centimeters – 0.1 millimeter, rod more than 5 cm – up to 0.15. The tip of the screw should evenly and smoothly move into the rod, not to have jar, cracks and chips, and its dumpness should be no more than 0.8. On the surface of the fastener, traces from clamps used during processing.

If the dowel has a corrugated surface, the distance between the edges can be up to 0.8, and the depth between them is not higher than 0.15.

The surface of the nail is processed Protective layer zinc, Thickness of at least 6-7 micrometers. Load Depending on the diameter, the length of the fastener and the material in which the dowel was drunk may be different. Need to take into account Foundation density, which is to work, as well as in which plane will be installed – vertical or horizontal (floor, wall, ceiling). On the nail there is an asymmetric cutting or a carving that should not impede his input to the sleeve, but thanks to her, the nail cannot be pulled out or unscrewed.

Dowel themselves are made of plastic – polypropylene, nylon, polyethylene. They withstand surfaces from concrete – 200-450 kilograms, from brick – 150-400 kilograms. Just like nails, they can be produced from steel rods, such fasteners are used as heavy and withstand the load up to 5 tons. Plastic color can be white, black, gray, blue, red and orange.

Size range of species

According to the standards of the dowel, a diameter is made – 5, 6, 8, 10 mm. There are not such common, for example 4 mm. Length varies from 20 to 150 mm, the size of the dowel-nail is selected according to the design parameters. For the conventional designation in the marking, two values ​​are indicated, the first is the diameter, the second – length. The most popular dimensional row fasteners – 4×20, 4×40 mm, 5×30, 5×40 mm, 6×30, 6×35, 6×40, 6×50, 6×52, 6×60 mm, 6×70 mm, 6×80 mm, 6×100 mm, 8×40, 8×50, 8×60, 8×80 mm, 8×100 mm, 10×50, 10×60, 10×80, 10×100 mm, 10×120 mm, 10×160 mm, 12×60, 12×70, 12×80 mm.

Also, the sizes of hardware can be determined using the tables in which all the necessary parameters are specified for each type.

Dowel fasteners are divided into types.

  • Umbrella (or facade). It features a large hat and length. Designed for fixing large layers of insulation. Nail can be made of steel or shockproof plastic.
  • Chemical. Fastening occurs due to adhesive capsule. There is a chemical dowel of ampoule and injection types.
  • KW (or fasteners for aerated concrete). When installing, threading takes place, but the base material itself is not destroyed. Can withstand load from 400 to 600 kilograms.
  • Universal. Designed for both surfaces of emptiness and solid. When installing the nail of the sleeve “twisted” and forms a peculiar nodule, providing reliable clutch and fixation.
  • Molly (or folding spring) dowel. Made of steel and when installing “folds”, mounted in thin and hollow walls. Also, he can call him a butterfly dowel.
  • Pouring. Has additional fastening mustache, there may be a three-spoken, four-spoken and six-speech. Carnail with thread is clogged with a hammer.
  • Frame. His distinctive feature is the unusable form, it is elongated.
  • Metal for concrete. For fasteners it is best to use a special pistol, but you can install manually. Holes need to prepare in advance.

It is worth noting that Some models come in a set with a puck for sealing.

Choice rules

Before purchasing a dowel fastener, you need to know Which surface it will be mounted. An important parameter when choosing is Diameter and Length Fasteners. What they are more, the greater the load it withstands. It also takes into account the thickness, density of the surface and the presence of emptiness.

For example, for the plinth, the most running universal dowels with a diameter of 0.6 centimeters and a long up to 8 centimeters are suitable. This is one of the reliable mounts, but if you need to disassemble the design, problems may arise. It must be remembered that all the necessary markings are applied before installation for mounting on the wall and under the holes on the plinth, which will be drilled in advance in advance. The diameter of the holes should be equal to the diameter of the dowel.

For toilet with small dimensions Installation with dowels will be the most practical option. Complete with hardware should go rubber washers or gaskets. Here you also need to measure the surface and put markup where the fasteners will be inserted. Next drills a drill hole in the tile, and after the construction perforator in concrete. For insulation and foam plastic, facade copies are suitable, in their foundation there is a special gear cutting, due to which the dowel-nail is securely attached to the base.

As a fastener for a TV, for a wall entrance hall, for hiding kitchen, shelves and other furniture, which will be installed in a vertical plane, it is better to use metal nails for aerated concrete or frame.

Also a good option – a spacel dowel, it will not damage or destroy the wall when installing.

In the next video, you will learn about the types, features and features of the installation of dowel-nails.

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