Dimensional range of self-tapping screws for wood, metal, chipboard, fiberboard. roofing screws

All photos from the article

The development of the roofing materials industry has led to the emergence of new types of fasteners - roofing screws. A special type of screws are used to attach metal profiled sheets to a wooden or metal base.

Let's talk about the main types of these screws today.

Features of the fastener device

Roofing screws have significant differences from other types. To overcome the resistance of the metal sheet that secures this fastener, its rod, even with a small length, has a significant diameter. Also high strength contributes to the material from which the parts are made - carbon steel.

The head of this type of fastener is made in two main designs - semicircular and hexagonal. The first option is equipped with a cross slot for a screwdriver or bit of the appropriate shape. The second slots in the hats do not have, since their shape suggests the use of special hexagonal nozzles for a screwdriver.

Another feature of roofing hardware is the presence of two washers. One of them is made of special high-strength rubber.

Its task is to seal the installation site by tightly pressing against the hole in the metal roof. The second washer distributes the force from the head of the screwed screw to the rubber gasket.

Note! IN last years on the construction markets self-tapping screws appear, equipped with EPDM washers having a concave shape. This allows, when screwing in the self-tapping screw, to create an additional force on the clamp. rubber gasket along the edges, more reliably closing the access to atmospheric moisture to the hole in the metal roof.

The main types of roofing screws

Before dwelling in more detail on the types of fasteners, let's talk about the use of roofing iron.

Currently, profiled steel sheets are used:

• for the manufacture of metal roofs various shapes use roofing materials, having the name "profiled sheet" and "metal tile".
• for the installation of walls of industrial buildings, coupled with the use of various heaters, in the form of so-called sandwich panels;
• for the manufacture of metal.

Self-tapping screws for wood and metal

Depending on the material of the base to which the metal sheets are fastened, a roofing screw for metal and wood is divided. The main structural difference between the two hardware is the shape and size of a small two-blade drill on the tip of the screws.

Note! A simple self-tapping screw is very difficult to screw through a metal sheet with a thickness of 0.5-0.8 mm. The process of pre-drilling at the fastener installation sites will require a significant amount of time in the total amount of work. In this regard, manufacturers combine a screw and a drill in one fastener.

The length of the drill located on the tip may be different and depends on the expected thickness of the base for fastening metal sheets. This aspect must be considered when buying fasteners. The price of fasteners with extended cutting edges may differ slightly from screws that have a shorter drill.

The diameter of the cutting part of the screw also varies depending on the type of base material to which the profiled steel sheets are mounted. By appearance House master must distinguish between hardware for a metal and wooden base.

The diameter of the drill for roofing fasteners for a steel base, which is often various rolled products, as well as rectangular pipes, has a size close to the diameter of the main thread. U width cutting edges 2-2.5 times smaller than its screw part.

Another criterion that must be considered when choosing fasteners is their length. It depends on the thickness of the attached material, the quality of the crate and its thickness.

The dimensions of roofing screws for wood or metal are located in sufficient large range which expands the possibilities of their use. Since longer screws allow for more secure fastening, they are recommended on complex roofs with a steep slope.

The color range of sold hardware is not very large. They produce screws with a galvanized surface, as well as painted in the color of the most common types of profiled sheets - green, brown, red-brown (cherry), white and blue.

Use of roofing screws

If you are planning to install a roof or install a fence from a profiled sheet with your own hands and have never encountered the process of installing roofing screws, the proposed instructions will help.

1. Determine the type of base to which you plan to mount metal parts, and purchase a sufficient number of screws with a drill according to GOST of the required color and length. The average consumption is 8 hardware per one profiled sheet of standard size.

1. The work of screwing in will be greatly facilitated by a screwdriver with a bit having a hexagonal hole for a hat of 8 mm. When fastening sheets on the roof, try to choose a tool of light weight, as it will be difficult to perform a large amount of work with a heavy screwdriver.
2. Lay or install a profiled sheet on the crate, insert a self-tapping screw with a hat into a bat. The device is equipped with a small magnet, which allows the fasteners to be securely fixed. This is convenient when working in hard-to-reach places limiting retention.
3. It is recommended to screw fasteners perpendicular to the metal surface in lower part waves. The drill of the self-tapping screw drills through the metal of the profiled sheet and is introduced into the crate. metal base is also drilled, and the screw cuts into it with a threaded part.

1. Try to set the optimal force on the screwdriver to prevent strong deformation of the rubber gasket. Otherwise, it will not fulfill its purpose, which will lead to metal corrosion and roof leakage.

Concluding the conversation

From a large number of screws for various purposes roofing screws are distinguished by their special shape. They are very easy to use and reliable. Their service life correct use can reach 50 years.

A more detailed story on the topic contains a video in this article.

Despite the fact that hardware products, in fact, can be considered "small things", the Baltopttorg online store does not bypass it, paying great attention to hardware. The reason for this is the wide demand for hardware products among the population using it in the most various works. If you still don’t know what hardware is in St. Petersburg, then we inform you that this term is, in a way, an abbreviation for “metal products”. This can include a wide variety of high-quality metal products, which, for the most part, have a wide purpose. Take, for example, gypsum wood self-tapping screws, which are also products of a wide or domestic use. They, of course, can also be ranked among the hardware, the price of which is at a minimum level. At the same time, in addition to products that are quite familiar to us, there are also specialized (industrial) hardware, which can not be bought everywhere. A striking example- self-tapping screws with a drill for metal. You are unlikely to need them in everyday life, but for industry they are simply irreplaceable. So, in Baltopttorg you can buy hardware in all their huge assortment. We definitely pay attention to each item, with special emphasis on ensuring that the price of our hardware is as low as possible. And let the difference be only one or two rubles, in comparison with competitors. The total cost will still be significant, because you are unlikely to take hardware in St. Petersburg individually. For standard work, you will need at least a handful of them.

We proceed to a more detailed consideration of the assortment of Baltopttorg in this section. To begin with, we note that, despite the fact that hardware products are not limited to fasteners alone, for our region, buying fasteners in St. Petersburg is similar to the expression "buy hardware", which is explained by cultural characteristics. So, if you need to buy fasteners in St. Petersburg, you have definitely come to the right place. Everything that you only dream of, you will find in this section. For example, you may urgently need to buy exhaust rivets. Can you find them in Baltopttorg? Of course! Or maybe you have been looking for a long time all over the city, where is the best price for roofing screws? Again, you have found the right place for you. Not only are we proud of our genuinely huge assortment, but it’s also cheaper to buy fasteners in St. Petersburg in our online store. Let's not get too excited about exactly how we managed to achieve such significant success in pricing. Let's just say that for any hardware products, including wood screws, you simply can’t find prices lower, you don’t even have to look. What conclusion can be drawn from this? Very simple. If you need to buy fasteners in St. Petersburg, contact Baltopttorg immediately. You will not regret!

Let's take a simple example. Let's say you urgently needed to buy St. Petersburg rivets. You can choose from a variety of sizes of blind rivets, which you can buy easily and simply. So, at the very beginning, you determine the size of exhaust rivets you need. Their price is determined precisely by the size, because in all other parameters they, in principle, do not differ from each other. All sold by us rivets are aluminum. The price of this material is not high, but the quality and reliability are quite worthy. It follows that aluminum exhaust rivets, the price of which, as we have already found out, are better than ever, despite their mass character, will be extremely reliable and durable.

By mass character, we mean the fact that it will not work to buy aluminum rivets by the piece. They are sold in packages. Each such package contains approximately 1000 aluminum blind rivets. The price for each feature is calculated by an elementary formula. Just divide the total packaging cost by 1000 and you will find out that a single aluminum rivet often costs less than 50 kopecks. Even if you need large fasteners measuring 4.8x18, then in this case, the price of one piece for exhaust rivets will only slightly exceed the ruble. Agree, this is quite an acceptable amount, taking into account the fact that aluminum rivets are usually bought for their mass use. One rivet in the work will not do. So, if you have already decided to buy exhaust rivets and know the size you need, you just have to make a couple of clicks, after which the order will be processed. Before you blink an eye, you have already managed to buy St. Petersburg rivets. And that's without leaving home!

We pass to the next position of the fasteners and hardware section - self-tapping drywall wood screws. Already in the name of this product is the word "gypsum plasterboard", which indicates that the GD self-tapping screw is ideal for drywall works. Of course, drywall is far from the only scope of its application. Since these are self-tapping screws for wood (the price for them is minimal today), they can be used both as part of woodworking industry products and directly with wood. Self-tapping screws of the State Duma enter it no worse than drywall. Considering the range of fasteners offered, you will surely notice that Special attention we give black wood screws. Yes, they are very visible wooden surface. But in this, it is believed, their great advantage. At least if you buy wood screws in St. Petersburg in black, you will definitely distinguish them from other fasteners in your box. Due to the fact that black wood screws have a characteristic shape, you will never try to screw them into metal, which, of course, they will not withstand. We draw your attention to the fact that you can buy wood screws in St. Petersburg only in a package, each of which contains 1000 pieces of products.

Another popular hardware product is the GM self-tapping screw. The two letters that appear after the name of the product itself carry the corresponding meaning, which is easy to understand. If in the past case, the GD meant "plasterboard wood", then in this case, we mean gypsum metal self-tapping screws. Similar to wood products, metal screws (you can always buy in our store) have a stylish and eye-catching black color. But their shape, especially in terms of the distance between the thread pitch, is different. Sold in a convenient plastic container, gypsum metal self-tapping screws - one of the most reliable ways to work with fastening metal surfaces regardless of the end goals. Depending on what load the surface will be subjected to, you will need to buy metal screws of the appropriate size. How larger size, the greater the load the black self-tapping screw GM can withstand. But take into account the fact that the increase in the size of the product occurs not only in terms of its diameter, but also in terms of length, which may affect the progress of work with fasteners.

If you have to work on the improvement of the roof, then you simply cannot do without roofing screws St. Petersburg. Hardware of a special design allows you to strengthen not only roofing materials, but also the facade. Unlike the same self-tapping screws with a drill for metal, a package of roofing screws (the price in the catalog is indicated per package, not per piece) contains not 1000, but 250 pieces. This is explained both by the complexity of the execution of hardware, and the lack of special need for in large numbers roofing screws St. Petersburg when performing profile work.

In the hardware section, presented by the Baltopttorg online store, you will find such fasteners as self-tapping screws with a press washer. Not to say that this element belongs to the "exotic" fasteners, but it is intended for strictly defined tasks. In particular, self-tapping screws with a pressure washer, the price of which is still not so high for 1000 pieces, can be successfully used if there is a need to fix sheet plates. Pointed self-tapping screws with a pressure washer effectively fix the plates in a fixed position. The convenience of working with these elements is ensured by the presence of a hemispherical head in a recess for Phillips screwdriver. As in all previous cases, the price for self-tapping screws with a press washer is determined by their size. Well, what size is needed in your case, you decide for yourself, focusing on upcoming work. We also suggest paying attention to self-tapping screws press washer drill, which are also used to work with sheet plates. If in the case of ordinary self-tapping screws it was a sharp tip that allows you to quickly penetrate deep into the surface, then the self-tapping press washer drill allows you to drill with greater fastening reliability, which is also important when fastening thick sheet plates.

Self-tapping screw GD is made of carbon steel with anti-corrosion coating. This alloy of iron with carbon without impurities has increased strength.

Currently optimal solutions by coverage are

• application protective film, consisting of metal phosphates
• white or yellow zinc treatment

"Black" self-tapping screws are obtained due to the phosphate layer on metal product which improves grip paintwork with fastener. Self-tapping screw GD phosphate - the best way during painting work. Our company offers to buy wood screws wholesale and small wholesale, delivery across Russia is possible. If self-tapping screws are coated with bituminous varnish, then their protective characteristics increase, and they are applicable in conditions high humidity. Under the action of solutions of alkalis and acids, the phosphate film is destroyed.

"Yellow" self-tapping screws have an attractive sheen and can be used with these decorative features fastener products. The process of galvanizing is based on the technological method of oxidation of the upper layer of hardware (4-20 microns) with zinc. Zinc oxide acts as a passive coating, protecting the metal from further oxidation by oxygen penetration.

When choosing the size of the self-tapping screw GD, the formula is applied:
optimal length of the self-tapping screw, L mm = thickness of the GKL material to be attached, mm + (20-25) mm

The thinner the galvanized wood screws (rod diameter), the easier it is screwed into the tree, but this also affects the strength of the structure.
The loads to which the self-tapping screw is subjected work on shear and bending.
Below is short table to select the size of the anodized self-tapping screw GD, depending on the impact of the mass of the attached product

Is there a GOST for wood screws?

In the domestic standardization system, there are the following standards: GOST 1145-80 "Screws with a countersunk head. Design and dimensions" and GOST 10618-80 "Self-tapping screws for metal and plastic. General specifications". Almost all fasteners are produced at Asian factories that adhere to the standards required to obtain a Certificate of Conformity. When imported into the Russian Federation, self-tapping screws must have confirmation that the products comply with the requirements of regulatory documents.

General characteristics of the self-tapping screw GD

Self-tapping wood screws are hardly inferior in popularity to any other fastener. Without them, there would be no solid wooden furniture, frame supports, doorways and many building structures, including drywall (by the way, if you've ever looked for special fasteners for this purpose, then there are none). A self-tapping screw is a reliable, but at the same time a simple and affordable tool. Today, in the editorial review of the site, we will talk about how to choose the right wood screws, and tables with sizes and prices will help you navigate in their diversity and choose correct option for specific type works.

Read in the article

Advantages and disadvantages of wood screws

Self-tapping screws appeared in Russia back in the sixties of the XX century, the classic bolt was taken as the basis. However, if you look closely, then his thread covers the entire surface of the rod, while the self-tapping screw does not. And the material used for advanced fasteners is more durable.

Take note:

There are varieties of self-tapping screws that are used in working with materials different density both metal, plastic and wood. Sometimes these fasteners are also called "hardware", short for "metal product".

A comment

“Wood screws are suitable for mounting fiberboard, OSB and chipboard. For fixing drywall sheets, fasteners of a certain size are used - 3.5 × 25 mm.

If we talk about the advantages of such fasteners, then they are obvious:

1. High strength and rigidity of the connection.
2. Possibility of multiple use.
3. Adjustment of the required screwing depth.
4. You can do without electricity, because you can screw in a self-tapping screw with a simple Phillips screwdriver.
5. Versatility. No need to use additional elements(washers, gaskets).
6. High speed of work.

The only drawback is some fragility of self-tapping screws (hardened steel becomes brittle over time). Fasteners, especially those with a phosphated finish, can break with even a small amount of force. And it can't be seen from the outside. Unlike self-tapping screws, nails do not have a similar hidden defect.

Types and classification of self-tapping screws

The key difference between self-tapping screws for wood is a wide thread pitch. It is this feature that distinguishes these fasteners from those intended for metal structures.

This feature significantly reduces the friction force, which allows you to screw in self-tapping screws without special effort with a simple screwdriver. There are many classifications of wood screws, depending on the characteristics of the surface to be fixed, their shape and type of thread. Let's consider each of them in turn.

Interesting fact! There are extremely small hardware. They received interesting name- "seeds" because their appearance resembles the shape of sunflower seeds. In some versions, they are also called "bugs" due to the relatively large hat in relation to the length of the stem.

Because not everyone knows about different types, and, consequently, the purpose of the "consumables", a lot of problems arise: self-tapping screws break, the work process is complicated and delayed.

Depending on the nature of the surface treatment

It doesn’t matter what size the hardware is, short or long, it must be covered special surface, which protects the metal from oxidation and further strengthens it.

Black (oxidized) wood screws

Sometimes they are called self-tapping screws GD - drywall-tree. Thanks to a secret hat, they are used for indoor finishing works. After screwing in, such fasteners are practically invisible and lend themselves well to puttying and leveling work.

Design features self-tapping screws GD:

1. sharp tip. This feature saves time during the installation process.
2. Rare thread pitch. Most often used on soft rocks, which allows you to screw in the self-tapping screw easily and without effort.
3. secret hat.
4. hardened metal.

There are two subspecies of black screws:

1. Phosphated. This is a special coating that gives a black matte color. These are the most brittle self-tapping screws, they are used for simple types works with a low degree of pressure. They have poor corrosion resistance, so should be used in places with low humidity.
2. oxidized. These screws are subject to additional processing magnetic oxide, more wear resistant. They don't look matte, but glossy.

Important! There is a variety of GM self-tapping screws - drywall-metal, on the contrary, they have a frequent step, which makes the wood surface more loose and sloppy. Under the influence of loads, a shelf with such an improperly selected self-tapping screw may break.

Moreover, the thread can be applied to the entire length or partially cover the product. There are certain parameters: self-tapping screws up to 55 mm long come with a full screw thread, from 65 to 75 - in this case, the thread length is 50 mm, and if the self-tapping screw is more than 90 mm, this figure reaches 60 mm.

A comment

Head of the team of the repair and construction company "Dom Premium"

"How softer breed wood, the more rarely we use a self-tapping screw. Then the surface will not “bump”, and for high-quality fastening of parts, just a screwdriver will be enough.”

Most often, black self-tapping screws are used in conjunction with dowels. Among the minuses, the masters call their low resistance to moisture.

Yellow-passivated and galvanized wood screws

This type of hardware is resistant to corrosion. They are most often used as decorative fasteners. Among the minuses - enough high price and the softness of the metal, due to which they can bend during careless work with a screwdriver.

Galvanized fasteners are most often found in furniture structures. They have a silver tint and are also not hardened. But they are almost invisible in any designs.

Depending on the shape

Fasteners of this type differ not only in the composition of the coating and the width of the screw "pitch", but also in the shape of the cap and its design. Depending on the features of the work, several types of its execution are divided.

Wood screws with press washer

The press washer ensures precise and firm fastening of thin sheets, e.g. wood or plastic panels, most often such self-tapping screws have a slot under Phillips screwdriver. Most often, self-tapping screws with a wood press washer have a sharp tip and do not require additional drilling. The length of self-tapping screws of this type varies from 13 to 76 mm, and the nominal diameter is 4.2 mm.

Wood screws with hexagonal head

In appearance, such self-tapping screws resemble an ordinary hex screw. This self-tapping screw is sometimes called a "grouse".

They are used where a sufficient power load is needed, for example, for assembling and attaching rafters.

Furniture self-tapping screws - confirmations

Confirmat is a type of self-tapping screw that is familiar to anyone who has ever assembled furniture from an IKEA supermarket. Such hardware has a flat head and a concave hole for a special hex key.

Depending on thread type

Depending on the type of thread, such self-tapping screws come in several variations:

1. With full thread. The simplest type of fastener. The thread in this case is located along the entire length of the self-tapping screw. This type of fastener creates the greatest possible and strong adhesion to wooden structure. Allows you to withstand large longitudinal loads. Such self-tapping screws can be easily screwed into a tree at different angles.
2. Self-tapping screws with ribs. There is a cutter in the head of the self-tapping screw, in the process of twisting it increases the diameter of the hole and allows you to effortlessly drown it into the tree. Sometimes self-tapping screws are equipped with a middle cutter.
3. Adjusting screws. They are used for mounting doorways, frames and window structures. They are distinguished by countersunk heads with special notches and a sharp tip. Self-tapping screws of this type allow for adjustment of structures.
4. Insulating screws. Such screws allow you to fix the crate on rafters, beams, screw the mesh to the rail. Most often they have two types of heads: semicircular with a press washer or cylindrical.
5. Self-tapping vane. Used for mounting wooden crate. A drill is usually located at the end of the screw, which allows you not to drill a hole in advance.

Dimensions of wood screws - table

Self-tapping screws for wood are produced in various types and sizes, here are the main ones:

State standards for wood screws

According to the parameters of GOST, wood screws received a certain marking - they correspond to a single standard number 1145. This GOST was adopted back in the 80s of the last century. Since then, he has not changed.

The standards clearly standardize the fastener manufacturing process down to the size of the fastener head and the applied coating. Thus, you can know exactly which self-tapping screw is needed for certain purposes, and buy it anywhere in our country.

How and with what screws are fixed

Among the variations of tools that self-tapping screws perfectly “contact” with, naturally, a screwdriver takes the first place.

The name "self-tapping screw" has long been heard and most of knows people very well in general terms, which roughly represents this fastener.

Builders actively use the same self-tapping screws for metal during repairs, in construction work and in everyday life to connect various elements. In stores, they are sold by weight or in small batches, but large items are also purchased individually.

Product selection features

In construction stores and at the bases, huge selection self-tapping screw elements- such official name fastener catalogs - according to the forms, materials used, dimensions, purpose and other functions. Naturally, a number of questions arise on this topic, since an inexperienced beginner can get confused in such a variety, and experts do not always understand the differences and use one type of fastener for all types of work. For the sake of clarity, this important topic should be analyzed in more detail.

Self-tapping screws for metal

When buying self-tapping screws, every knowledgeable buyer focuses on very specific problems that these accessories must solve. Initially, a logical correlation is observed: for metal, a self-tapping screw for metals should be used, for roofing - roofing, and for wood, respectively, for wood. The parts used for working on metal are presented in two varieties: with a pointed and drilled end.

pointed end

The appearance of pointed self-tapping screws used for metal work is very reminiscent of traditional screws from the times of the USSR. They are made of good quality metal and have dense threaded turns, the inter-ridge interval is small. This is done intentionally to improve the connection between the screw and the hard material.

More common is the spread of screw diameters for metal in the range of 3–5 mm, while its value increases with increasing length of the product.

Manufacturers produce such elements with the following parameters:

• length 10-50 mm with a thread pitch of 5 mm;
• 60-100 mm in 10 mm increments;
• 11-120 mm with 15 mm thread, quite rare;
• 125-220 mm, cutting 20 mm.

However, the above data is approximate, since there are many manufacturers of these fasteners, and the supplier himself regulates the dimensions of the products.

For fixing 2 mm metal, there is no need to create preliminary holes, sharp end the screw will pierce them itself. But with a greater thickness of the connected elements, it is necessary to drill a passage with a diameter somewhat smaller than that of a self-tapping screw, for a tighter entry. A similar method will allow you to perform reliable adhesion to the part.

Self-tapping screws for metal are made from hard grades of first-class steel. On sale they are supplied with a galvanized or oxidized protective coating.

The color of commercially available pointed self-tapping screws for metal is mainly black, metallic or gold.

By the type of product, you can find out what parts it is intended to connect:

with drill end

Such screws have certain differences. Characteristic features such screws from the preceding species are:

Self-tapping screws with a drill for metal no pre-drilling required. The tip pierces the material, making a passage for itself and immediately twisting into the base to be fastened. The special shape of the hat provides a tight connection. In case of inaccurate entry, it is not recommended to unscrew the product and reuse it, since the tip will already be blunt.

Wood fasteners

Possess hallmark- have a rare spiral thread pitch. It is clear that wood is soft and pliable, not too dense material for construction, and therefore the coils are mainly separated along the core.

The dimensions of the diametrical section of fasteners for wood do not differ from those for metal, and their length varies widely from 11 to 200 mm inclusive.

The smallest representatives of this category of self-tapping screws are called “seeds” in household slang, since their shape resembles sunflower seeds,

It is usually possible to screw in wood fasteners without first drilling a hole. However, it is advisable to screw a large self-tapping screw with a length of 150 mm or more and a diameter of 4 mm or more into a pre-drilled channel so as not to cause cracking of the fastened materials.

furniture screws

From the name it is clear that furniture screws are designed for assembling furniture elements. Their length is traditionally 50 mm. Confirmates must be screwed into the prepared channel, that is, a pre-drilled hole, since the end part of the self-tapping screw is blunt.

The head of the fixing screw for furniture assembly has a grooved niche for internal key- hexagon. The diameter of the confirmation is the same along the entire length, but has a smooth thickening in front of the head so as not to disrupt the element under significant loads.

Modern furniture is made mainly from MDF, chipboard and other glued materials, and a furniture self-tapping screw is designed to assemble parts that are not solid in composition. Confirmate has high carved ridges and is quite flat hat, which in total gives good reliability fastening and allows you to drown the hat and cover it with a cap to match the base material.

Parts with press washer

This option has already been considered in the information on self-tapping screws for metal with a drill end, however, this type should be distinguished into a separate subgroup due to important feature- the presence of an increased contact area of ​​the cap. The press washer tightly fastens the pressed wooden slats or metal sheets with a thickness of up to 10 mm.

They do not have a characteristic color, usually there are brilliant variants of a silvery tone.

Hex head element

In appearance, this type of self-tapping screw resembles an ordinary bolt. However, it is different a number of signs:

• rare screw thread;
• slightly pointed end.

The main use is fixing massive elements of large objects. The “hex self-tapping screw” is usually screwed into wood, but when using a dowel, it is also suitable for concrete. Dowels for hex head screws should be selected according to the diameter and be two sizes larger than the self-tapping screw.

Any work with fasteners are carried out with keys of 10, 13 and 17 mm.

Roof fasteners

Hex head, depending on the size of the screw, there are only two options - 10 and 8 mm. Roofing screws are distinguished by the following features:

The rubber washer-lining performs a dual role:

• a good insulating gasket that prevents moisture from flowing under the hat into the hole for fixing the roof;
• elastic shock-absorbing joint seal.

Self-tapping screws for roofing are made in any color to match existing RAL palettes of roofing materials.

Anti-vandal types

Such screws may look similar to other options, but upon closer inspection, the difference is obvious.

It consists in special types of grooves on the caps; these can be multifaceted, star-shaped or paired grooves. They cannot be unscrewed with a conventional tool, which is the reason for the name of the fastener.

Within the framework of this article, the most commonly encountered types of self-tapping screws are described. There are many types, including a narrow focus, so it is advisable to try to select exactly those fasteners that are designed to connect specific materials. It is not worth saving and using available fasteners, since poor connection of surfaces is possible, which will lead to a violation of the strength of the connection.