If you do not know what the word Schraube, Wood screw or Vis à bois means, do not despair! These overseas words unite one very familiar and understandable: a screw. About the use of screws you can create legends and songs, because you can not find a more hardworking fastener. It is on the thin shoulders and the body of the screws account for the bulk of the ongoing fastening and installation work.
Content
For finishing and installation work, the screws are used when joining two surfaces of building materials. There is an opinion that wooden surfaces are the most popular for the use of screws. Is this true in fact, and where are the screws used?
Classical screw design
The appearance of the screw is due to the domestic hardware industry. State standard 27017-86 gave the fastener a special thread, a sharp conical end and a head. Here it is, the classic design of the screw.
The screw is a rod, easily screwed into the material.
The stem of any screw consists of threaded and smooth parts. The threaded part is located closer to the end. The main "rule of the screw": the diameter of the threaded part is equal to the diameter of the smooth part.
A small screw "penetrate" into the cavity helps to carve and securely fixes in the material a hat. The screw of the screw performs the following functions: securely tightens the bonded material and allows deftly screwing in the fasteners. Distinguish the heads of the following configuration:
• secret
• Half-secret
• Semicircular
• Hexagonal
• Square.
The use of a certain type of head is dictated by the conditions and features of the national installation, materials proper and aesthetic requirements.
Slots (slits on the head) serve to transfer the torque to the screw.
Intensively developing fastening technologies gradually replaced the "grandfather" method of fastening: "new" screws of self-tapping screws with qualitative design allowed their reusable use. So, screws for all occasions.
Universal fasteners for all occasions
Screws for woodworking
A characteristic feature of wood screws and their effective use can be called the shape of their heads. To connect wooden parts or elements, the fastener head can be flat or semi-glazed, as well as decorative. Screws of wood screws distinguish simple and cross-shaped. The screws with a cross-shaped slot have a number of undeniable advantages:
• a screwdriver or a screwdriver bit is instantly "centered" in the head
• a cross-shaped slot of different sizes implies the use of a single screwdriver
• work in hard-to-reach places for installation in the presence of a cross-shaped slot becomes convenient.
Fastening for concrete
Screw for concrete (nagel) is a rod with a variable height of thread. Has a countersunk head and a sharp tip. It is used for fastening to concrete surface, foam concrete and brick. To twist such a screw, a special bit is used, in the form of a hexagonal star, known to specialists and masters as TORX.
Screw for concrete requires a pre-drilling hole, after which the screw is screwed into the attached part. For a stronger fixation of the body of the screw inside the base, incisions are made along the entire length.
Screws for metal
Self-drilling screws maximally reduce installation time, because they simultaneously produce three mechanical actions: drilling, fastening and compacting.
Screws for metal (self-drilling) are designed:
• for fastening metal sheets or lap joints
• as a fastening to the steel frame
• for fastening metal guides
• for fixing to steel structures with an insulating layer
• for fastening sandwich panels.
Screws of self-tapping screws for metal have a press cup for fastening. Such screws with a press-cup are used for connecting installation works of sheet steel (up to 2-3 mm). The presence of a drill at the end of the screw eliminates the pre-drilling process. The semicircular head and presshead perform a tight fixation of the materials.
Screw dowel
An anvil with a screw is intended for quick mounting of structures with practically any base. With the help of a dowel screw, suspension structures or elements, laths, plinths, frames or door jambs, gypsum board profiles, suspended ceilings and engineering frames are attached. Due to the construction of the dowel in combination with the impact screw, the work is done using a simple tool. The screw can be clogged with a hammer without the possibility of reversal. Thread on the rod allows you to change the depth of fastening or dismantling. Therefore such an excellent combination of the dowel and screw capabilities make this type of fasteners indispensable.
Of course, a worthy leader of fastening are screws of self-tapping screws.
Screwdriver
What is the difference between a screw of a screw and a traditional screw? It's all about the design of the rod, or rather in the thread. The core of the screw consists entirely of a threaded part or has a diameter of a smooth part of a smaller size than a threaded part. The end of the screw is sharper than the end of the screw, the thread height is growing to a lesser extent.
Thus, mounting with self-tapping screws is more convenient and simple, so the scope of screws for self-tapping screws is quite diverse. After all, the main task of fastening with the help of screws is the fixing of several bases, one of which must be deformed. Self-tapping screws are made of stainless and high-carbon steel with subsequent zinc coating. Corrosion-resistant coatings significantly increase the life of self-tapping screws, the fasteners become reliable and durable. For each type of installation work, self-tapping screws are selected taking into account the work being done: for fixing gypsum board, metal profile or thin sheet material.
When choosing the type of screw, it is necessary to be guided by the material of the working surface. A decent and correct choice of fasteners will provide a quality fastening.
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