Guests on the woods on the tree. What are self-tapping screws, product sizes. Screws for scaffolding.

Short bolt screws are threaded screws with large threads and sharp points for ease of installation. Used to directly fasten two wooden surfaces. A smooth conical shank under the head prevents the wood pulling or splitting and provides more even placement on the surface. Wooden screw is a threaded screw with a sharp thread on a rough step. A smooth conical shank prevents extrusion or separation of wood. Wooden screw is a threaded screw.

Rough steel hexagon high-load bolts have sharp points and aggressive threads that help penetrate thick wood without prior drilling and provide high shift values. The most common material used in the fasteners, this material is predominantly iron mixed with carbon. It has the greatest strength compared to other metals and elements, but has the lowest corrosion resistance.

Slot - Smile :) Incredible, but the fact

This material has a pronounced gold painting and is mainly used in aesthetic conditions or in applications where low friction is required. As a galvanic coating, it is non-magnetized and resistant to corrosion. It is often used when the sparking is a problem. It has excellent cold working properties. Used in locks, gears, door handles, plumbing, electrical applications and musical instruments.

Iron-based material with chromium content of at least 5%. This material is known for its corrosion resistance and has different strength depending on the amount of chromium and nickel alloy. Chrome forms protective layer When exposed to oxygen, holding steel under corrosion. There are more than 150 varieties of this material, and the most common series 304 and 316 are the most common.

This alloy is 96% of copper and about 2-3% silicon. Possessing very high corrosion resistance, it is usually used in salted water, fresh water, wastewater and atmospheric conditions. It is strong enough and similar to low carbon steel in hardness. This is a popular alloy due to its combination of strength, plasticity, corrosion resistance and weldability. This is usually observed in architecture, marine applications, pumps and boilers.

All the way in a hat

The supply of screws is almost impossible to skip. Small metal pins are manufactured in numerous versions, so the choice of a suitable screw for the wizard is not facilitated. When is the screw used? What are the advantages of cruciform screws with a slot when used screws with a retractable head and how does the earth affect the selection of the screw? What is the term metric thread? Which screw belongs to the dowel?

Differences between different screws

Roughly you can distinguish the types of screws according to what they have to connect. Classic under the screws is probably a wooden screw. When using self-tapping double thread, it is used when the parts of the tree must be quickly connected. As a rule, it consists of galvanized steel and can be recognized with yellowish or bluish color - corrosion protection. However, if you open a threaded connection for wind and weather, you must use stainless steel screws.

Infix structural tapping screws

It is best to screw it with a wireless screwdriver - pre-reconciliation is not needed in the case of a wooden screw. The metal screw can be recognized by its conventional thread and cylindrical shape - it often includes a nut or other twisted thread, which he screws. If you want to connect wood with a metal, a special screw with secret head and milling ribs is a screw. Without prior drilling, he passes through the forest. As soon as the drill penetrates into the metal, the "blades" of the screw breaks up so that the screw is firmly connected to the metal.

Due to its conical shape, the self-tapping screw resembles a wooden screw, but has a hardened special thread, which provides a good support for all types of sheet metal and plastic plates. If there is no drill tip, it must be drilled.

The concept of a metric thread will always come to you when you buy a screw. All screws, locked with nut, have such a thread. With it, the outer edges merge in the form of a wedge, so that it cannot be released by itself. One option is a thin thread that has a narrower and deep-cut thread profile. Both types are used mainly for metal processing.

The choice of the correct screw is also important when fastened. Here you must use a cured steel screw suitable for a wireless screwdriver. In order to avoid sliding and twisting, it is recommended to use a zenkovka, lens or round head with pressure drive. It is important that the screw will definitely match the size of the fork - as much as possible.

Other features of screws

In addition, the screws are differentiated in accordance with their head drive. The pin screw is classic among the screws and is practical, because almost every household has a suitable screwdriver for this type at hand. Since this type of screw also easily slipped and the transfer of force may be weak, new screw types have always been developed - in the industry, the slit screw is practically not applied. The most common forms except the slot screw are an external hexagon, an external square, an internal hexagon, an internal hexagon, inner diversity, an inner square, as well as a cross-shaped gap.

Screw - selfselography. Where confusion arises from

Each type has its advantages and disadvantages that should be weighed in accordance with the application site. Thus, the outer hexagon is a cheap, easy-to-use screw, which, however, requires side fit for tightening the screw. With an internal hexagon tool less, and can be installed on top, however, the transfer of strength is much worse than with an external hexagon.

There are two different cruciform screws that are protected brands. To save the tool, it is worth looking more carefully. Simplified, it is easier to say that the more actuators provided by the screw. They also have good effort and can be screwed using a small tool.

Various heads

Screws differ not only in the drive, but also in the shape of a head. Clean optical device, or is it more when the head and a half head is used, head head or lenses? On the one hand, the head is actually aesthetic causes: for example, wooden countersunk screws are usually used, which after washing merge with the material or recessed so that they can be filled. In addition, the use of decorative screws is used to decorate the product. Linte-shaped head is also decorative elementwhich is used, for example, in fittings and armrests - and is often made of brass or in bronze form.

On the other hand, there are also practical causes for a certain shape of the screw head. Thus, the head of the milling head screw is immersed in wood independently through small burrs. The neck area is prevented under the head of the carriage bolt, which is a universal turn screw up the nut is tightened. Thus, the screw can be released only from the mother's side - that is why it was widely used in the construction of doors. Even today, the shut-off screw is a universal screw in each box of tools.

An annular screw is used when a compound from a tree or metal remains mobile. There are many more practical developments, such as a screw with a terrace, which has a small head, so that it can not get rainwater. Anti-splitting or corrugated. The screw is determined in accordance with several basic criteria that determine the environment, material and appropriate support for each model.

First, the screw type of the screw: this characteristic, especially aesthetic and practical, depends on your preferences, as well as from work or actions that will be performed after installation. The countersunk head is designed so that it is flush with the surface of the substrate and, thus, was very careful and practical for the coating or painting, for example. The dome-shaped head is often preferred for its aesthetic side. Hexagonal or hex head provides the best tightening torque.

Then the impression of the head determines the effectiveness and ease of conversion. Two other ordinary fingerprints are a gap and a hexagonal cavity. Hexagonal impression provides excellent retention and especially significantly reduces the likelihood of damage to the screw head, even for the most clumsy. The screw material is required to determine the performance of fixation in this environment. Stainless steel screws are ideal for outdoor, wet or salt medium. Even if most screws are made of steel, a wide range of coatings can be used to differentiate them.

The length of the thread, complete or partial, determines the thickness of the part fixed on the support. In addition, the threaded screw with partial thread allows you to install a real compressive force between two wood pieces, while total thread Provides more rigid fixation.

Finally, some of the largest brands introduce innovations and stand out by their special design. Or splitting devices: The cutting label prevents weakening wood during screwing. There are other, such as conical tips for primer or primer to improve adhesion and durability of binding. The resistance class is, for example, 8, 9 or 9: they determine the hardness and elasticity of the screw. For hardness exceeding 9, it is necessary to show vigilance to unnatural sudden temperature drops, which can lead to a tool rupture after screwing.