Self-tapping screws in concrete are characterized by ease of operation, but at the same time characterized by a high level of reliability and durability. This explains why these fasteners are very popular with builders.
Features and destination
Self-tapping screws in concrete were actively used even in those times when the construction of exclusively wooden structures flourished. Today, such a screw, he is brazen, is mainly used to fix the window frames or parts of the tree on massive concrete facilities, to install suspended furniture or the facade tile or during the interior decoration.
Cape concrete is created in accordance with GOST 1146-80. It looks like a curly nail with a round or square cross section. There is no pronounced point at the fastener. The unevenly applied thread ensures reliable fixation of self-pressing, and the correctly selected material and the presence of additional coating contribute to the extension of the service life. The metal tip of the screw does not allow it to fool during twisting into the surface.
By the way, the methome of concrete can be used with brick, but only with certain characteristics. The appearance of the screw depends on the use of a specific material.
Review of species
In addition to the fact that the self-made of concrete can be anchor or applied along with a dowel, there are several more classifications of this fastener.
On the shape of the head and slot
The heater can be equipped with a hex, cylindrical or conical head, if it is a speaker. There are also varieties with a secret design. Svalz Self-shaped in the form of an asterisk or is cruciform. The form can also be hexagon for the immigracy tool or in the form of a barrel for the end key. The straight line for working on concrete is not suitable.
Concrete self-sufficiency is most often created from carbon steel. This material has good strength, but often suffers from corrosion, and therefore requires additional galvanization or other coating. Stainless steel screws are created from alloy with nickel adding. They do not require additional corrosion protection and are suitable for operation in any conditions.
Hardware from brass are not afraid of corrosion, nor the impact of chemical elements. However, being plastic, such a metica can withstand only a limited number of kilograms, otherwise it is deformed.
By the design of the thread
Her metmen on concrete there are 3 main thread species.
- It can be universal and applied either with a dowel or without it.
- The carving is performed in the shape of a Christmas tree, that is, is inclined and “compiled” from the cones embedded one in another. In this case, the length of the fastener reaches 200 millimeters. Such a hardware is either clogged with a hammer in the hole, or is used complete with a dowel.
- Possible an option with a variable step of turns, which is performed with additional notches. This option allows you to ensure reliable fixation, as well as to use a self-strained dowel screw.
By type of coating
Galvanized fastening elements of silver shade are suitable for any activity, and golden, additionally processed brass or copper, can only be operated for internal manipulations. Zinc layer is necessarily galvanically applied. Black oxidated elements are not particularly advised by the appearance of rust, and therefore are used to use only indoors with a normal level of humidity. Film on the surface is formed using a chemical reaction with an oxidizing agent.
It is also possible phosphating – that is, the metal coating layer of phosphate, as a result of which the coating of grayish or black colors is formed on the surface. If the screws are made of stainless doped steel, then it will not need additional coating.
In the table of self-sorting sorts of concrete, it will be possible to find all possible indicators, including an outdoor and inner diameter, a thread step and length. Thus, It is in it that one can see that the maximum length of the fastening element is 184 millimeters, and the minimum – 50 millimeters. The diameter of the screw of the self-press, as a rule, ranges from 10.82 to 11.8 millimeters. The outer section is 7.35-7.65 millimeters, and the thread step does not go beyond the boundaries 2.5-2.75 millimeters. The parameters of the outer diameter range from 6.3 to 6.7 millimeters, and internal sections – from 5.15 to 5.45 millimeters.
The height of the head can range from 2.8 to 3.2 millimeters, and the depth – from 2.3 to 2.7 millimeters. The diameter of the used drill is always equal to 6 millimeters. This means that it can be operated both samples with dimensions of 5×72 and 16×130 millimeters – it all depends on the load on the heaters and some other parameters.
When choosing a self-press on concrete, the main condition is the ability of fasteners to withstand serious loads. To do this, it should be used by special calculations already made by experts. According to them, It is believed that for the design, the weight of which exceeds 100 kilograms, they are required with a length of 150 millimeters. If the weight of the structure does not exceed 10 kilograms, then the element is suitable, the length of which is not more than 70 millimeters. Nevertheless, the selection should still be conducted taking into account the steps of the installation of napillates.
The weaker material and the greater the weight of the weight, the longer the screws should be. For example, for the details lighter than a kilogram so at all fit the heater with dimensions of 3 by 16 millimeters. The design of the head of the brace is selected depending on how the surface looks like on which it is attached.
If necessary, hardware can be masked with decorative lining.
Between individual self-draws, it is customary to leave either 70 or 100 millimeters. This gap may vary depending on the material and the specifics of the wall, as well as the size of the design itself. It should be mentioned that the choice of hardware should also take into account the conditions for their operation. For example, a bathroom with high humidity and a dry living room requires screws with different coatings. In the first case, galvanized rods or stainless steel items will be required. In the second case, it is better to take either oxidized, or phosphatated black screws.
The cost of self-tapping screws is determined depending on the quality of the material used, the coating option and even the country of manufacture. For 100 pieces of napheli dimensions of 3.5 per 16 millimeters, it will be necessary to pay from 120 to 200 rubles, and for elements of 4 per 25 millimeters – 170 rubles. A set of 100 hardware 7.5 to 202 millimeters will cost 1200 rubles.
How to use?
Screw the bell in the concrete wall is possible by two methods – either using a dowel, or without it. The presence of a plastic sleeve in the opening will provide a more reliable coupling due to its “process”, working as struts. The use of a dowel is required in cases where there is an excessive load on the screw, or fasten the item is necessary on porous or cellular concrete. In principle, you should use a plastic strut and when working with structures that are exposed to vibration. Installation of self-contained concrete with a dowel begins with the fact that in the wall it is necessary to drill a deepening, the diameter of which coincides with the section of the sleeve, and the depth will be 3-5 millimeters more. You can drill an electric train, but when processing a soft or porous material, it is better to use a screwdriver with a drill.
The perforator is used in those situations where the density of the concrete wall is 700 kilograms on a cubic meter or even more. The resulting hole is cleaned from the garbage, and then the usual hammer dowel rolled into the nest. The self-sufficiency itself will be correct to twist a simple screwdriver or a screwdriver with a bat in the already prepared place. Installation of concrete brace can occur without pre-drilling. This is done either by the pattern, or with the preliminary application of the channel. When using a template, screw the methome into the concrete surface will need to be directly through the hole of the pattern made from a wooden piece or a fragment of the board. If everything is done correctly, the fasteners will be reliably fixed perpendicular to the surface.
When working with a mark, the hole will need to drill a little smaller size than the diameter of the self-press itself. Helling with a thread “Fir-tree” It is customary to drive into the concrete hammer. Be sure to mention that the use of screws implies preliminary drawing. The indentation of the edge of the structure should be equal to at least the double length of the anchor. In addition, it is important that the depth of the opening exceeds the length of the self-reserves by the value equal to one diameter. When working with light concrete, it follows the depth of landing equal to 60 millimeters, and for heavy blocks – about 40 millimeters.
When the bells are selected to fix the wooden structures or window frames on concrete or brick walls, first the surface is determined, and the brown is dried out. Next from the edge of approximately 5-6 centimeters. When installing window frames from PVC, the gap between the screws is preserved equal to 60 centimeters. In the case when it comes to wood or aluminum structures, you will need to withstand the distance of 70 centimeters, and the plus maintain from the corner of the frame to the racks 10 centimeters.
Heat is screwed up with very smooth movements, especially if porous or hollow concrete is represented.
Some experts are recommended throughout the workflow. Wash the drill in water or oil to avoid excessive heating. If the heater is turned by a screwdriver, it should be selected in accordance with the drawings applied on the product head. Can suit both curly and cruciform variation. To pull the broken self-tapping screw from the concrete wall, it is better to oversee the zone around it and carefully pick up fasteners with thin rounds. Next, the resulting opening is closed with a plug of similar diameter, the melted PVE glue, or is filled with a larger dowel. To fasten the plinths with self-drawing on concrete, manipulations will need to start from the inner corner of the room.
By making markup, in the plinth and on the wall it is necessary to prepare holes for screws. First there is a fastening of the dowels, and then with the help of self-screws, the plinth is neatly fixed on the wall. In the event that the surface is made of concrete, a recess is usually drilled equal to 4.5 centimeters, and the fastener itself is carried out at a distance of 3 centimeters. When working with a wall made of silicate brick, the hole will be deepened by 5.5 centimeters, and the anchoring is made to a depth equal to 4 centimeters. This type of self-samples can also be used for surfaces from pumice – in this case it will be necessary to first create a recess equal to 6.5 centimeters, and the gap between methms to withstand 5 centimeters.
When working with a light concrete, the depth of the opening should be 7.5 centimeters, and with full bricks – 5.5 centimeters.
How to complete the screw in concrete, look in the following video.