Most of the surviving monuments of wooden architecture were erected without a single nail, with the help of only an ax, and this fact is still admired. But over the centuries, made of metal fixing systems used for construction have changed a lot, so today it makes no sense to repeat the "feats" of their ancestors. It is necessary to build simply, quickly and reliably. Consider the metal fasteners offered by manufacturers using the example of nodes and elements that make it possible to significantly simplify and speed up the connection of the floor log with beams or, and at the same time some other operations.
Photo: ESSVE. Beam shoes are provided with 5 mm diameter holes (located on both flange and lapels) for nails/screws and 9 or 11 mm diameter holes for bolts or capercaillie screws. On the lower surface of the flange there is a hole with a diameter of 7 mm for additional fastening of the log
1. Connecting elements with perforation
Photo: Eurutec. Special elements for performing operations common in wooden housing construction: adjusting screw for window boxes or crates (a); tightening screw (b); Hobotec self-tapping screw for fastening massive board, blockhouse or imitation timber when sheathing wooden house(in)
If the floor beams and joists are not visible in the interior, then they can be connected using the so-called beam shoes, produced, for example, by Essve. These elements are suitable for attaching wood not only to wood, but also to concrete or brickwork(when using appropriate ). They are mainly made of 1.5 or 2 mm hot-dip galvanized steel, but there are also more expensive A4 acid-resistant stainless steel products on the market. Shoes are available in two versions: with lapels turned outward or inward. Price: from 50 to 500 rubles. for 1 piece
The manufacturer recommends fastening the beam shoes to the elements to be joined with special anchor screws with a diameter of 5 mm (depending on the load, the latter can be inserted into all or some holes), and with a very large load or fixation to the “stone” material, also use bolt holes. In addition to anchor shoes, perforated universal clamps (a), truss fasteners (b), corners (c), plates (d) shown in the figure, etc. are on the market.
Benefits of anchor screws
Why do manufacturers of perforated fasteners suggest using anchor screws? How are the latter better than ordinary self-tapping screws or anchor (ruffed) nails used to secure beam shoes and other metal perforated elements?
The advantages are due to the design features of the anchor screws.
Firstly, their flat head presses the metal element to be fixed more tightly against the wood.
Secondly, the smooth cylindrical part, located under the head of the screw, has the same diameter of 5 mm as the holes in the perforated metal elements. It completely fills the hole and therefore completely transfers the load, and also works well for shearing. In addition, thanks to the tapered head, the screw is better centered.
An ordinary self-tapping screw does not always transfer the load completely, it works much worse for shearing. Well, the anchor nail cannot be dismantled without destroying that part of the wooden element into which it is driven.
But the anchor screw is easily unscrewed and can be screwed into wooden element in a new place.
2. Metal systems "thorn-groove"
Nodal connector "Atlas" is produced by the German company EuroTec. The element is made of aluminum and consists of two parts, one of which is equipped with a spike, the second with a corresponding groove. They are attached to each other according to the principle " dovetail”, which makes it possible to ensure reliable transmission of vertical and horizontal forces, to perceive forces in tension and compression, and even bending moments. The connection can be both visible and hidden, for which both metal parts are recessed into pre-milled grooves. The length of the Atlas nodal connector is 70–200 mm. Price - 1500–5500 rubles. for 1 piece
The main competitors of EuroTec on Russian market are the Austrian companies PITZL and SHERPA Connection Systems, which produce a similar range of connecting elements. The SHERPA system is better known, providing a bearing capacity of joints from 5 to 280 kN -
a special program for calculations allows you to choose fasteners for each specific case. Any connector consists of two aluminum parts, which are also fastened according to the dovetail principle. The cost of SHERPA elements is from 800 to 12 thousand rubles. for 1 piece
Photo: VV Stanz-und Umformtechnik, PITZL. SHERPA connectors (a - e), made of heavy-duty aluminum alloy, and steel elements BB (f - h) allow you to create not only high-strength and reliable building construction, but also very aesthetic stairs and even furniture
Another EuroTec competitor is the German company BB Stanz-und Umformtechnik, which developed the BB connector. It is made of 4 mm thick galvanized sheet steel and, like its aluminum counterparts, consists of two parts that are fixed to each other according to the dovetail principle. Both halves are attached to the wood with self-tapping screws, the number of which depends on the size of the element. BB connectors are 70mm wide and 90, 125, 150 and 190mm long. The price is one of the most affordable today: 180–800 rubles. for 1 piece
Connectors allow you to solve problems in a few minutes, which in classical construction technologies take hours and even days.
3. Three-dimensional slats
Photo: Rotho Blaas. Three-dimensional perforated aluminum rails for creating hidden connections: Alumaxi (a), Alumini (b) and Alumidi (c)
The Italian company Rotho Blaas offers to connect parts located both perpendicular to each other in the same plane, and at an angle along the vertical, using T-shaped rails, which are made by extrusion from high-strength aluminum alloy EN AW-6005A. They are available in three versions designed for different levels of loads: Alumini, Alumidi and Alumaxi. In each, rails are presented both with holes in the base and a shelf perpendicular to it, and without holes in the shelf. The rails are available in fixed lengths (from 80 to 768 mm), and in versions without holes, 2176 mm rails are available with notches every 64 mm, which allows you to make fasteners of any length.
During installation, the base of the rail is attached to the beam with self-tapping screws, then a groove is made at the end of the log fixed to the beam, the dimensions of which correspond to the shelf of the rail. If the latter has perforations, then, using the shelf as a conductor, holes are drilled in the log, put on the shelf and metal pins are inserted into them. If there is no perforation, then a log is put on the shelf and the connection is fixed with self-tapping screws with a drill. The price of rack mount: 1230–18 425 rubles. for 1 piece
The connecting system should be selected in accordance with the dimensions of the sections of the beams to be connected, as well as the static and dynamic loads acting on them.
4. Hidden elements like "Hedgehog"
Photo: Rotho Blaas. Installation of elements "Hedgehog" is simple. A recess is made at the end of the log, into which a connecting element is inserted and fixed with self-tapping screws twisted at an angle. Next lag through advance drilled hole fastened to the beam with a threaded element screwed into the central hole of the connector
Rotho Blaas Disc Connectors are a carbon steel washer with a zinc plated finish. At the base of the washer there are holes drilled at an angle for self-tapping screws, in the central part there is a threaded hole. A stud is screwed into the latter, its free end is threaded into a hole pre-drilled in the beam and fixed on the opposite side of the beam with a nut with a wide washer placed under it. The resulting connection successfully works both for shearing and for pulling out. With a heavy load at the end of the log, up to three Disx elements with a washer base diameter of 50, 80 and 120 mm can be installed simultaneously (diameter of threaded holes - M12, M16 and M20, respectively). Price: from 4145 to 9044 rubles. for 1 piece (screws included).
An alternative to the Disc connectors are EuroTec's IdeeFix elements. The fixture is made in the form of a hollow cylinder with an outer diameter of 30, 40 or 50 mm, made of aluminum alloy. At the bottom of the cylinder there is a hole with M12, M16 or M20 thread. At the top there is a conical recess with holes for self-tapping screws drilled at an angle of 45°. The IdeeFix element is attached in almost the same way as the previous connector, but the lag to the beam is fixed not with a pin, but with a powerful bolt with a wide head (included in the kit along with self-tapping screws). Price - 1500–4500 rubles. for 1 piece
5. Self-tapping screws with full thread KonstruX
These unusual products allow you to save not only the time required to assemble the assembly, but also money, because connecting metal elements are not needed. Self-tapping screws are fully threaded for high pull-out resistance and are fully screwed into the wood at 30°, 45° or 60° angles, revolutionizing how they work. In this case, the screws work only for pulling out, which allows them to take on a significant part of the forces acting on the joint. Thus, it is possible to connect the parts at an angle (a), to unite the elements, while reducing their deflection (b), to reinforce the cutouts in the beams and logs (c) (see the figure below).
Photo: Eurotec. Choose a suitable KonstruX screw, the fastening scheme of the elements, and also calculate required amount screws are helped by a special ECS program, which can be freely downloaded from the website of the manufacturer of self-tapping screws or a large seller
There are self-tapping screws with a cylindrical (screw diameter - 6.5; 8 and 10 mm) and countersunk (screw diameter - 8 or 11.3 mm) head. Length - 65–1000 mm. Price - 20–800 rubles. for 1 piece To install screws with a length of less than 245 mm, pre-drilling is not required, but for longer ones (to prevent drift to the side), it is recommended to pre-drill holes for a self-tapping screw to a depth of up to ⅓ of its length.
6. Special screws
With the help of a Hobotec self-tapping screw, massive boards, a blockhouse or an imitation of a bar are fixed. The head of the product is equipped with milling ribs and is easily embedded in wood, and the tip is made in the form of a drill. The cutter in the middle of the length of the screw increases the diameter of the hole, allowing you to tighten the fastened element more tightly. Self-tapping screws with a diameter of 3.2 mm and a length of 20 to 60 mm are made of ordinary coated steel (price - 1100–2200 rubles for a package of 500 pcs.) or stainless steel (price - 3500–7500 rubles for a package of 500 pcs. .).
The tightening screw is also equipped with a cutter, but its tip is different - it has a special groove that turns the screw into a drill for wood. The flat hat has large diameter and is equipped with a self-sinking head and a hexagonal slot. The self-tapping screw is coated with a special wax coating that reduces friction when screwing in. Product diameter - 3–12 mm, length - 30–600 mm. Price - from 300 to 5 thousand rubles. for a pack of 500 pcs.
Photo: Eurotec. Self-tapping screw - vane for fastening wood paneling to the steel base. Equipped with a drill tip and special "wings" (located above the tip), which expand the hole in the wood and break when drilling metal. As a result, having cut a thread in the metal, the self-tapping screw is fixed in it, and the cap attracts the wooden element to the metal. Length: 32–125 mm. Price: from 500 to 2500 rubles. for a pack of 500 pcs.
The adjusting screw is useful, for example, for fixing window and door frames or wooden lathing to wood, concrete, brick or metal (the element can be supplied with a drilling tip of two types). The self-tapping screw is screwed into the box and the wall or power element behind it in one step. At the same time, the annular conical “spikes” located under the head of the screw are firmly fixed in the box (almost like a fishhook), due to which its position relative to the wall is easily adjusted by further screwing in or out of the fastener. Length - from 60 to 125 mm. Price - from 2000 to 3500 rubles. for a pack of 500 pcs.
Special self-tapping screws allow you to significantly speed up and facilitate the execution of those operations that are necessary when creating wooden structures.
For the use of various wood compounds in the field of construction, not only tools are indispensable, but also without appropriate experience. That is why for inexperienced craftsmen such connections are not always obtained accurately. One of the best options- use by professionals a variety of types of fasteners for the array, which are made of metal.
Many surviving architectural monuments built of wood without nails, using only an axe. This fact causes true pleasure to this day. However, centuries later, fasteners erected from metal, used to build solid wood structures, have changed radically, for this very reason it is pointless to repeat the experience of our ancestors today.
It is preferable to erect quickly and without difficulties. Let's talk in more detail about the fasteners offered by manufacturers, taking as an example the details that make it possible to simplify the connection of beams with floor logs or solid wall surfaces as much as possible.
Fasteners with perforation
When beams, as well as logs of the floor surface are hidden in the interior space, it is possible to connect them using beam shoes. This fastener for wood structures is suitable for fixing the array not only to wood, but also to concrete, brickwork. It is made from durable steel.
Manufacturers advise attaching such fasteners to the parts to be joined with special screws, and in case of excessive load, or fixing to stone material, use the holes for the necessary bolts. In addition to anchor shoes, today you can purchase special clamps, and much more.
tenon groove
This galvanized wood fastener consists of a tenon part and a groove part, which are joined together to ensure better transmission of horizontal as well as vertical forces.
The connection can be visible or hidden; for this purpose, steel parts are recessed in advance into special grooves.
Reiki three-dimensional
A modern Italian company produces fasteners that are placed perpendicularly and vertically at an angle, using T-type rails, created by extrusion from a high-strength steel alloy. They are produced in several modifications, provided for multi-level loads.
The fastening system must be selected according to the size range of the cross-sections of the combined beams and the dynamic and static loads acting on them.
During installation, the rack base is attached to the beam by means of self-tapping screws. Then, on the end part, attached to the base of the log beam, a groove is created of the same size as the rack shelf. In the absence of perforation, the shelf is equipped with a lag and the connection is fixed with self-tapping screws.
Hidden details Hedgehog
These connectors are steel washers, the base of which is equipped with holes drilled under the slope. These holes are for self-tapping screws. There is a threaded hole in the center of the washer into which a pin is inserted. Its free end is threaded into a special hole and fastened with reverse side beams with a detail with a washer.
The created connection works perfectly not only for pulling, but also for shearing. With excessive load in the area of \u200b\u200bthe end part of the log, it is possible to install several elements at the same time.
Fasteners with complex thread
Unusual self-tapping screws, which make it possible to save time, money, as in this option no metal parts required. Self-tapping screws are equipped with threads that help create a high degree resistance when pulled out, and also tightly twisted into an array, which completely changes their traditional functioning.
In this case, the work of the screws is exclusively for pulling out, which gives them the opportunity to take most of the effort that falls on the connection. So, you can fasten elements at an angle, combine parts, minimizing their deflection, as in the photo of wood fasteners below.
Self-tapping screws for special purposes
Using similar elements, they fasten quite massive wooden crafts. The hat has milled ribs and is easily recessed into the product, while the tip is created like a drill. In the middle of the screw, the cutter makes a larger hole, helping to pull the element as tightly as possible.
Self-tapping self-tapping screw will be useful for fastening door frames, window openings, solid wood sheathing to wood, metal. The self-tapping screw is screwed directly into the box, as well as the wall surface located behind it, or a power part.
The self-tapping screw acts as a weather vane for high-quality fastening of solid wood sheathing to a base made of steel. It has a tip in the form of a drill and wings placed above it to expand the hole in the tree.
When drilling metal products, the wings break. As a result, having made a carving in metal part, the self-tapping screw fits snugly against it, while the element from the array is attracted by the cap to the metal.
Photo of wooden fasteners
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A rich selection of dry building mixes at the manufacturer's price is presented in the GLAVSNAB online store. In the assortment of the company you will find:
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- Perforated fasteners
- Fixing angles
- Shaped fasteners
- Hidden details "Hedgehog"
- tenon groove
- supports
- Fasteners with complex threads
Fasteners for wooden structures are necessary to connect building elements into a complex. Mounting parts are made of steel, aluminum alloys and other metals.
Kinds
Fasteners differ in size, their functions in the joints of wooden elements among themselves and in fastening wood to other materials: concrete, brick, metal. The use of parts allows you to evenly distribute loads, avoid destructive deformations inside the tree.
- with perforation;
- corners;
- shaped;
- hidden details "Hedgehog";
- thorn-groove;
- supports;
- hidden;
- with complex carving;
- decorative overlays.
Perforated fasteners
The main material of mounting elements is galvanized steel. The geometry of the structures can be different. Common feature- the presence of many holes. Perforation allows you to select the desired attachment point in the tree. Self-tapping screws are screwed through it or screw nails are driven in. The advantages of this type of fastener:
- Saving time on connecting structural elements made of wood.
- A small amount of waste when performing the fastening of knots.
- Possibility of installation of several hardware in one plane. This increases the bearing capacity of the mount.
- Variety of types of mounting products. Lets pick up optimal solution to evenly distribute the load on the wooden components of a part of a building, structure.
- Versatility. Suitable for all lumber.
- plates;
- corners;
- holders for beams;
- three-dimensional slats;
- mounting tape.
Planks with many holes are used to fasten wooden elements in one plane. In terms of details can be different shapes(for example, in the form of the letter T, Z). The plates are made of steel with a thickness of 1–3 mm or more.
Parts are easily bent, which is convenient when pairing wood at an angle of 90 ° or more. Scissors for metal plates can be cut.
corners
To connect wooden structures at right angles, equilateral, reinforced, double-reinforced, anchor metal corners. There are more complex products: Z-shaped, sliding, and other modifications.
Beam holders
The product allows you to connect the beam and bars. Fastening is established on self-tapping screws or screws. The supporting part of the beam is fixed from the sides and from below. Perpendicular planes of the steel part are fixed on the transverse bar. The photo shows one of the holder options.
Reiki three-dimensional
There are different lengths. Design feature - the connection elements fix the tree in three planes. Reiki form a strong and reliable fastening in knots. Metal longitudinal rails perform two functions: they bind the wood into single system, are load-bearing beams, which take on a significant part of the vertical load.
Fasteners - T-profile made of durable steel alloy. They are produced by the Italian company Alumidi. Reiki are selected based on the cross-section of the connected elements, the level of dynamic and static loads.
Perforated galvanized steel tape is used as an auxiliary fixator when making complex knots of wooden structures. It is easy to cut into pieces. Can also be used as a fastener metal products to wood.
Fixing angles
These mounting elements have one or two holes on adjacent planes. Corners for fastening wood can be equipped with 1 or 2 stiffeners. They are used in the construction of structures made of wood, the manufacture of furniture.
Can be the main and auxiliary fasteners of wood to other materials. Inner corner- 90°,120° or 135°.
Shaped fasteners
This type of metal products includes a wide range of parts.
Hidden details "Hedgehog"
Steel washers have internal thread inclined. Drill through washers in wood through holes. A washer is also installed on the reverse side. A pin is screwed into the channel, which tightens the tree.
Several studs are installed at the junction nodes at once. In solid wood, the rods occupy a crossing position. This creates a strong concealed fastening wooden structures. Fastening is also carried out with long self-tapping screws, which are located at an angle in solid wood (usually 45 °). This method is used in the construction of a wooden roof.
tenon groove
The fastening is created due to the material of the connected parts. In one element, wood is removed around the protrusion (thorn), in the other array, a groove is cut.
The spike must enter the groove with some force to firmly pinch the protrusion in the hole. Lateral stresses create frictional forces between the tongue and groove, forming an almost inseparable connection.
Depending on the dimensions of the parts, the dimensions of the spikes and grooves are determined. In cross section, they can be rectangular, square, oval. To increase the bearing capacity of the nodes, the parts are lubricated with carpentry or synthetic glue. In some cases, the fasteners are reinforced by installing additional metal fasteners.
supports
These are two supporting steel plates, pulled together by a hairpin. They are installed between the bottom of a wooden house and the foundation. The upper platform is fixed with self-tapping screws and bolts to the lower wooden structures of the building. The bottom plate freely rests on the base of the house or is fixed with hardware, welding. The design plays the role of a jack. By turning the studs, the horizontalness of the floor is adjusted. This type of fastener makes it possible to exclude the penetration of moisture upwards, creates a reliable support system for the house.
Advantage - invisible connection of massive structures. The clamping elements are hidden in the grooves of the wood, which are connected by a drilled channel. A pin is inserted inside. On the one hand, the rod comes out, has a nut. By rotating the nut with the stud, tighten the plate hidden in the groove.
Hidden fasteners are used in interiors frame houses from glued timber. This type of fastener is expensive. The installation process is labor intensive.
Fasteners with complex threads
Complex carving - combining the helical cutting surface of a self-tapping screw with a drill at its end. The drill is narrower than the screw diameter. It punches the way of the cutting spiral of the screw. Hardware of this profile is used in working with hardwoods.
Are intended for registration of seams of connections from a bar and a board. Figured plates are installed indoors, on facades wooden houses.
The use of joinery and carpentry joints in construction requires not only special tool but also a lot of experience.
Therefore, for non-professionals, such connections most often turn out to be sloppy. The best option- apply new types of metal fasteners
Most of the surviving monuments of wooden architecture were erected without a single nail, with the help of only an ax, and this fact is still admired. But over the centuries, the fastening systems made of metal used for the construction of wooden houses have changed a lot, so today there is no point in repeating the "exploits" of our ancestors.
It is necessary to build simply, quickly and reliably. Consider the metal fasteners offered by manufacturers using the example of nodes and elements that make it possible to significantly simplify and speed up the connection of the floor log with beams or wooden walls, as well as some other operations.
1. CONNECTING ELEMENTS WITH PERFORATION
If the butt beams and logs are invisible in the interior, then they can be connected using the so-called beam shoes, produced, for example, by ESSVE. These elements are suitable for fastening wood not only to wood, but also to concrete or masonry (when using appropriate dowels).
They are made mainly of hot-dip galvanized steel with a thickness of 1.5 or 2 mm. but there are also more expensive products made of A6 acid-resistant stainless steel on the market. Shoes are available in two versions: with lapels turned outward or inward. Price: from 50 to 500 rubles. for 1 piece
The manufacturer recommends fastening the beam shoes to the elements to be joined with special anchor screws with a diameter of 5 mm (depending on the load, the latter can be inserted into all or some holes), and with a very large load or fixation to the “stone” material, also use bolt holes. In addition to anchor shoes, perforated universal clamps (a), truss fasteners (b), corners (c), plates (d) shown in the figure, etc. are on the market.
THE MAIN ADVANTAGE OF FASTENERS WITH PERFORATION IS ACCELERATED INSTALLATION WHILE INCREASING THE STRENGTH INDICATORS OF THE CONNECTIONS ADVANTAGES OF ANCHOR SCREWS
Why do manufacturers of perforated fasteners suggest using anchor screws? How are the latter better than ordinary self-tapping screws or anchor (ruffed) nails used to secure beam shoes and other metal perforated elements? The advantages are due to the design features of the anchor screws. Firstly, their flat head presses the metal element to be fixed more tightly against the wood.
Secondly, the smooth cylindrical part, located under the head of the screw, has the same diameter of 5 mm as the holes in the perforated metal elements. It completely fills the hole and therefore completely transfers the load, and also works well for shearing. In addition, thanks to the tapered head, the screw is better centered. An ordinary self-tapping screw does not always transfer the load completely, it works much worse for shearing. Well, the anchor nail cannot be dismantled without destroying that part of the wooden element into which it is driven. But the anchor screw is easily unscrewed and can be screwed into a wooden element in a new place.
2. METAL SYSTEMS "SHIP-GROOVE"
The element is made of aluminum and consists of two parts, one of which is equipped with a spike, the second with a corresponding groove. They are fastened to each other according to the dovetail principle, which makes it possible to ensure reliable transmission of vertical and horizontal forces, to absorb tensile and compressive forces, and even bending moments. The connection can be both visible and hidden, for which both metal parts are recessed into pre-milled grooves. The length of the Atlas nodal connector is 70-200 mm. Price - 1500-5500 rubles. for 1 piece
The main competitors of EuroTec in the Russian market are the Austrian companies PITZL and SHERPA Connection Systems, which produce a similar range of connecting elements. The more well-known system is SHERPA, which provides the bearing capacity of joints from 5 to 280 kN - a special calculation program allows you to choose fasteners for each specific case. Any connector consists of two aluminum parts, which are also fastened according to the dovetail principle. The cost of SHERPA elements is from 800 to 12 thousand rubles. for 1 piece
Another EuroTec competitor is the German company BB Stanz-und Umformtechnik. developed the connecting node BB. It is made of galvanized sheet steel with a thickness of U mm and, like its aluminum counterparts, consists of two parts that are fixed to each other according to the dovetail principle. Both halves are attached to the wood with self-tapping screws, the number of which depends on the size of the element. BB connectors are 70mm wide and 90mm long. 125, 150 and 190mm. The price is one of the most affordable today: 180-800 rubles. for 1 piece
Both parts of the Atlas connector are attached to wooden parts with self-tapping screws, twisted at an angle of 90 and 45 °. The connection is fixed with a locking screw.
CONNECTORS ALLOW YOU TO SOLVE TASKS IN A FEW MINUTES WHICH TAKE HOURS AND EVEN DAYS IN CLASSIC CONSTRUCTION TECHNOLOGIES
3. THREE-DIMENSIONAL RAILS
Three-dimensional rails are suitable for connections (with nails or screws) not only "wood-wood" ( minimum thickness lag attached to the beam - 45 mm), but also "wood-concrete", for which products with enlarged holes for anchor bolts are offered
4. Hedgehog HIDDEN ITEMS
These unusual products allow you to save not only the time required to assemble the assembly, but also money, because connecting metal elements are not needed. Self-tapping screws are fully threaded for high pull-out resistance and are fully screwed into the wood at 30.45 or 60° angles. which fundamentally changes the way they work. In this case, the screws work only for pulling out, which allows them to take on a significant part of the forces acting on the joint. Thus, it is possible to connect parts at an angle (a), to unite elements. while reducing their deflection (b), reinforce the cutouts in the beams and lags (c) (see the figure below).
There are self-tapping screws with a cylindrical (screw diameter - 6.5; 8 and 10 mm) and countersunk (screw diameter - 8 or 11.3 mm) head. Length - 65-1000 mm. Price - 20-800 rubles. for 1 piece To install screws with a length of less than 245 mm, pre-drilling is not required, but for longer ones (to prevent drift to the side), it is recommended to pre-drill holes for a self-tapping screw to a depth of up to Uz from its length.
The special ECS program, which can be freely downloaded from the website of the self-tapping screw manufacturer or a large seller company, helps to choose the appropriate KonstruX screw, the fastening scheme of the elements, and also calculate the required number of screws.
6. SPECIAL SCREWS
With the help of a Hobotec self-tapping screw, massive boards, a blockhouse or an imitation of a bar are fixed. The head of the product is equipped with milling ribs and is easily embedded in wood, and the tip is made in the form of a drill. The cutter in the middle of the length of the screw increases the diameter of the hole, allowing you to tighten the fastened element more tightly. Self-cutters with a diameter of 3.2 mm and a length of 20 to 60 mm are made of ordinary coated steel (price - 1100-2200 rubles per pack of 500 pieces) or stainless steel (price - 3500-7500 rubles per pack of 500 pieces .).
The tightening screw is also equipped with a cutter, but its tip is different - it has a special groove. turning a screw into a drill for wood. The flat head has a large diameter and is equipped with a self-sinking head and a hexagonal slot. The self-tapping screw is coated with a special wax coating that reduces friction when screwing in. Product diameter - 3-12 mm. length - 30-600 mm. Price - from 300 to 5 thousand rubles. for a pack of 500 pcs.
An adjusting screw is useful, for example, for fastening window and door frames or wooden lathing to wood, concrete, brick or metal (the element can be equipped with two types of drilling tip). The self-tapping screw is screwed into the box and the wall or power element behind it in one step.
At the same time, the annular conical “spikes” located under the head of the screw are firmly fixed in the box (almost like a fishhook), due to which its position relative to the wall is easily adjusted by further screwing in or out of the fastener. Length - from 60 to 125 mm. Price - from 2000 to 3500 rubles. for a pack of 500 pcs.
Special elements for performing operations common in wooden housing construction: adjusting screw for window frames or battens (a); tightening screw (6); Hobotec self-tapping screw for fastening a massive board, blockhouse or timber imitation when sheathing a wooden house (c)
Self-tapping screw - vane for fastening wooden sheathing to a steel base. Equipped with a drill tip and special "wings" (located above the tip), which expand the hole in the wood and break when drilling metal. As a result, having cut a thread in the metal, the self-tapping screw is fixed in it, and the cap attracts the wooden element to the metal. Length: 32-125 mm. Price: from 500 to 2500 rubles. for a pack of 500 pcs.