What is the difference between a self-tapping screw and a screw

Differences, advantages

What is so good about self-tapping screws, because they are practically the same screws, but of a higher quality? Self-tapping screws are made using a specific technology. For manufacturing, only strong steel alloys are used, which undergo subsequent heat treatment. Otherwise, we can say that they are made of hardened steel. Like all steel fasteners, self-tapping screws for corrosion protection can be phosphated, oxidized or galvanized with passivation.

After such processing, the screws become characteristic black or shiny white and acquire significant resistance to corrosion. For docking with the tool, they use clear and precise cross-shaped splines.

Self-tapping screws made of brass or stainless steel can be considered exotic.

Self-tapping screws with high screw threads have a thin and sharp profile. It is very easy to cut threads in sufficiently hard metals with self-tapping screws with such a thread profile. Moreover, its end is made in the form of a sharp cone. He, like an awl, makes a hole in the material for accurate installation and so that you can start threading. The work of the end of a self-tapping screw can be compared to the work of a drill. In some types of self-tapping screws, a kind of drill is formed at the end, which makes it possible to avoid drilling and threading. At the same time, it can be easily screwed into metal with a thickness of up to 2 mm.

Those self-tapping screws that are used to fasten various metal parts have more frequent threads. Quite often they have a two-start thread.

Universal self-tapping screws have medium pitch threads.

To fasten parts of wooden structures, self-tapping screws are used, which have a wide thread pitch, a large angle of inclination and a fairly sharp end.

The most popular self-tapping screws have a countersunk head that smoothly goes into a threaded rod. This form of fasteners is ideal for mounting drywall sheets. Self-tapping screws with a hex head are no less popular with us. Most often they are used when increased strength of fasteners is required. They are used together with plastic dowels for attaching heavy objects to walls.

The roofing screw has a hex head, which goes into a large washer (press washer). It has a rubber gasket to seal the joint and is painted in one of the common colors of roofing materials (white, green, red, etc.).

Self-tapping screws with a semicircular head turning into a washer are used to join sheet-shaped materials. These sheet metal fasteners have fine pitch threads. At the same time, the shape of the head with an increased diameter makes it possible to more efficiently fasten the material by increasing the pressure to the base, when it is simply impossible to make a countersink.

Short self-tapping screws with a tip in the form of a drill and a semicircular head are used to fasten parts made of a metal profile. Very often they are called bedbugs and fleas.

Also, screws and self-tapping screws have differences in the preparation of the material for the use of fasteners. When using a screw, it is necessary to drill holes, where it is then screwed in. When using a self-tapping screw, the material does not require such preparation. The screws have only two types of heads. Self-tapping screws have a huge number of types of heads: several types of countersunk heads, hexagonal with and without a washer, semicircular with and without a washer, cylindrical and trapezoidal.

Self-tapping screws, due to their strength, are used for fastening all kinds of materials, from wood, plastic to metal, concrete.

We can conclude that the difference between a screw and a self-tapping screw is that screws require a pre-drilled hole, and self-tapping screws are suitable for almost all materials and do not require preliminary preparation of the working surface.

Application features

In the very technique of using these fasteners, there is an important difference: before using the screw, the hole for the fastener is pre-drilled with a drill to create a guide channel, while the self-tapping screw is used immediately due to the sharpness of its rod and the material of manufacture. When drilling a hole for a screw, it is recommended to clean the hole from construction dust to reduce stress when tightening the rod.

The self-tapping of the self-tapping screw into the material without preliminary drilling is explained by the sharpness of the rod and the increase in the thread height.

Extruded food products are diverse and can be found in various segments of commercial spaces such as grocery stores, supermarkets, and convenience stores, and include, but are not limited to, cereals, confectionery, textured protein products, and pet foods.

Extrusion's versatility is reflected in the use of its products in preparing army and camping food rations, diet-specific foods, and foods designed to meet nutritional needs in natural disasters.

The screws are designed for working with soft materials - wood, plastic. Self-tapping screws are used for working with solid products - concrete, metal. Therefore, the material for the manufacture of self-tapping screws is more durable and has a phosphated coating to protect against corrosion.

Screws, screws, self-tapping screws, bolts and nuts - all this is combined under one name "construction fasteners" or, in other words, "hardware". Their main task is to fasten various parts of industrial and domestic structures. Depending on the specifics of production and purpose, all fasteners have their own characteristics.

Benefits of using extrusion. When it comes to traditional conditioning or processing methods, extrusion baked goods are distinguished by the ability to develop a variety of foods in flavor and texture, including expanding properties and crunchiness, in addition to increased food digestibility and nutrient bioavailability.

Thus, the environmental problems are very limited and the efficiency of the extrusion process is improved. But mainly from the 1960s, extrusion processed products began to multiply, given the high versatility of this process. However, the performance of the related equipment has not changed since then, with the exception of the possibility of incorporating new technologies based on computer programming parameters such as times, temperatures and production formulas to be used.

The most common part among all threaded connectors is the screw. It is with him that it is worth starting the distinctive characteristic of all threaded hardware in order to understand how a screw differs from a bolt and a screw.

Definition

A screw is a rod that has a head and a sharp thread. A fastener is used when it is necessary to attach a part to some soft material. For example, when it comes to twisting into wood or plastic products. The classification of screws can be different: there are products for wood and metal, and the fastener can also be divided according to the shape of the head. Today, the screw can have a hex, countersunk, square or semicircular head.It all depends on what the screw is used for, to which product it is attached. Over the self-tapping screw, it has both its own specific advantages and some disadvantages.

Screw

Self-tapping screw Is a screw with a sharp thread. The product has either a sharp tip or a drill tip - depending on what kind of work is being done. The main characteristic feature of self-tapping screws is that the triangular thread completely covers the cylindrical surface. For example, screws or screws do not have this feature. Today, self-tapping screws are made from various materials, including carbon and stainless steel, plus the coating itself can be different. All of these factors have a direct impact on the cost of the fastener, which varies greatly. Separately, it is worth highlighting the purpose of self-tapping screws - they are used for a variety of purposes: for fastening parts of wood, drywall, sheet material, metal profiles.

Self-tapping screw

Furniture screws

Such an element is also called komfirm or euroscrew. As a rule, such self-tapping screws are supplied with furniture. If you are doing the assembly yourself, then you will have options for both long and short fasteners of different diameters. Their common feature is a rare and high thread, a blunt end, and a flat head with a recess for a hex wrench or drill. The top is most often closed with a decorative plug, which makes the fasteners almost invisible.

Since the end of the Euroscrew is blunt, pre-drilling is always performed first.

Hexagon screws are also used for furniture, which are very similar to the usual bolts (they are called "wood grouses"). However, in this case, the threads will be thinner and the end of the fastener will be sharper. Such products are necessary for the installation of massive furniture or rather large elements. If desired, such a bolt can also be screwed into concrete. Only in this case will you need a dowel (twice the size of the screw).

Wood grouses are also used for pitched and other heavy structures.

Healthy! The hex screw can be easily removed with a wrench.

The main differences

For those who are not particularly versed in tools and materials, screws and screws are almost the same. If we talk about strength and versatility, then self-tapping screws benefit significantly.

During production, they are treated with a special coating, due to which they acquire high resistance to corrosion, in contrast to screws, which are susceptible to rust. Consider the most basic characteristics of how a screw differs from self-tapping screws:

• Self-tapping screws are made of hardened steel, which makes them highly durable. Because of this, the technology for the production of self-tapping screws is much more complicated than the manufacture of screws.
• The end of the self-tapping screw and the ribs of the thread are much sharper than the screw. Therefore, he received such a name "self-tapping screw", that is, "I cut it myself." This means that the hardware can, when rotating and under pressure, cut through the material into which it is screwed.
• The screw is much smaller and the thread pitch is smaller than that of the self-tapping screw. Due to this quality, the screw is significantly inferior to its self-cutting relative.
• For the screw, you first need to make a hole, and the self-tapping screw itself can make a thread in the part.

Well, the most basic difference between a screw and a self-tapping screw is metal. The screws are made from steel, and only hardened metal is used for the self-tapping screws.

Screws and screws

In conclusion, I would like to note that both a screw and a self-tapping screw are types of hardware products that are used to fasten various materials during construction and repair work. In practice, they are very similar to each other, because a self-tapping screw is a kind of screw, but if you look closely, these products have many differences.

One of the main ones is the scope and strength of the material.For example, a self-tapping screw is used to fasten various surfaces - both metal and concrete. To do this, it is made using a special technology, in which the metal is first hardened, and then amenable to special processing.

A screw is considered more fragile and is used for plastic or wood. For it, you first need to drill a hole, in contrast to a self-tapping screw with a sharp end, which itself "drills" its place in the product. Thus, we can conclude that the self-tapping screw has surpassed the screw, due to its density, strength, reliability and the possibility of using it on any surfaces.

The difference between a self-tapping screw and a screw is on the video:

Fastening systems

Major differences

Inexperienced craftsmen or people who are far from working with tools can get confused in the definitions of "screw" and "self-tapping", which can cause the wrong selection of fastening materials and complicate the main task

To easily cope with screwing fasteners into any base, it is important to understand what is the difference between these products. Differences are difficult to understand with the naked eye, but in work they are of great importance.

To understand the difference between a screw and a self-tapping screw, it is more convenient to present a comparative table of these two products.

The data in the table is enough to distinguish a self-tapping screw from a screw, but there are a number of other features.

• When working with self-tapping screws, there is no need to drill the material, since the fasteners have a tip similar to a drill, well-cut threads and high strength, which allows the product to be used for working with wood, plastic, metal and concrete. For a durable and easy screw tightening, drilling the surface is indispensable.
• Self-tapping screws have high strength due to the passage of the hardening stage, which allows you to work even with strong materials, but despite all the positive qualities, they are fragile, so the head can be torn off or bite off with pliers. The screws are made of a softer material, so they do not break, but bend, which is more convenient for a number of cases.
• On self-tapping screws, the thread is applied to the entire rod, which allows you to screw the product to the very head and fix it as much as possible. The screws have an incomplete thread, they have a smooth space under the head, which helps with tightening work, since the material does not crack during dynamic work.

The following video explains how a screw differs from a self-tapping screw.

Applications

According to their purpose, self-tapping screws with a press washer are quite diverse. Products with a pointed tip are used to attach soft or fragile materials to a wooden base. They are suitable for polycarbonate, hardboard, plastic sheathing.

Painted roofing screws are used in combination with a polymer-coated profiled sheet, their classic galvanized counterparts are combined with all soft materials, sheet metal with a smooth surface. It is necessary to screw in self-tapping screws with a drill tip with a special tool.

The main areas of their application:

• installation of metal lathing;
• hanging structures on a sandwich panel;
• installation and assembly of ventilation systems;
• fastening the slopes of doors and windows;
• formation of barriers around the site.

Self-tapping screws with a pointed tip have an even wider range of uses. They are suitable for most types of interior work, do not spoil even fragile and soft coatings, decorative elements in interior decoration.

Bolt, stud, screw

For clarification, it is worth referring to the official document, which is GOST 27017-86 “Fasteners. Terms and Definitions". It contains all the main characteristics for each specific hardware.

According to this vocabulary, both a screw and a bolt are fasteners that have a rod with an external thread. This, in principle, does not tell us anything, because almost all major hardware must consist of a core. However, in the text of GOST there is something that deciphers, in fact, how the screw differs from the bolt. There are two such characteristics.

The bolt has a head, while its congener has some kind of "structural element for transmitting torque", and this is not always the same hex or semicircular head. An “element” can also be just a slot applied to one of the ends of the screw body.

Another difference is the connection method. Bolt (it is called that) is distinguished by the obligatory presence of additional fastening - a nut, while screw fastening requires only the presence of a thread, and it is bypassed.

We will not stop and compare other fasteners, because a bolt, hairpin, screw, and also a screw and a self-tapping screw often mimic each other.

A hairpin is a fastener very similar to a screw and a bolt, the differences are true only in one part, namely in a threaded rod. Actually, it is this - a cylindrical body with a thread at both ends or along the entire length - that is a hairpin. It is used when it becomes necessary to bond two surfaces, sometimes leaving a gap between them.

Screw - The distinguishing feature of this fastener is the tip feature. It, as a rule, has a conical shape, which allows this hardware to create a thread on its own inside the surface into which it is screwed. However, the screws are so intelligent that they require preliminary processing in the form of a hole, because they are most often used in joints of rather soft materials - plastic or wood.

The more brutal older brother of the screw is a self-tapping screw or a self-tapping screw. And here a snag occurs with the terms. Bolt, hairpin, screw - here the differences seem to be relatively clear. As for the screw and self-tapping screw, GOST 27017-86 does not consider them either equal types of fasteners, or even subspecies. The official version is as follows: a screw - hardware in the form of a rod with a special thread and a tapered end, which forms a thread in the hole of the working surface.

Bolt and screw differences

But what we used to call a self-tapping screw is not a screw, although in design it is almost identical to it, but a self-tapping screw, the difference of which is the tip in the form of a cone and the ability to independently form a thread just right into the part. Well, if it ends with a drill, the correct official name for such a fastener will be a self-drilling self-tapping screw. Quite a tricky name, especially for identifying fasteners in stores.

In order not to confuse potential buyers, manufacturers themselves often move away from official, standardized names. The dimensions and quality characteristics of fasteners correspond to GOST, but the names are simplified. Screw and bolt differences mean themselves, if the first is small, and the second comes immediately with a nut. A screw is called a product with a tapered non-pointed tip, but self-tapping screws most often mean fasteners with a drill. It's definitely hard to make a mistake here.

Screw and self-tapping screw

This topic is not an easy one, because even the definitions in GOSTs provoke controversy among workers. Many argue that self-tapping screws are screws, just imported. After all, then their name was translated as "self-tapping screw", which over time was simply reduced to the word "self-tapping screw".

However, there is a difference between them and it is significant, which affects the practical application. Can you tell a screw from a self-tapping screw?

The attentive reader, of course, guessed that this is a trick question. After all, it is not the color that determines the essence of the product. The photo above shows 2 self-tapping screws, but with different galvanizing. Zinc gives a silvery color, and a yellowish tint appears due to chromium.

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There are also phosphated or oxidized self-tapping screws, they are black. However, these screws are more fragile and not protected against corrosion. Therefore, they are intended for interior work with soft materials and lightweight structures.

What a screw looks like

The screw shaft is wide enough, and it can be conditionally divided into two parts: with a thread at the end and without a thread near the head. This is the main visual difference that immediately catches the eye and helps to distinguish.

For the manufacture of a screw, soft grades of steel are usually used. Because of this, it is more likely not to break, but to bend. The downside of this was that you can erase the slot literally at the first tightening. Also, the screw does not have any protection against corrosion due to the lack of any special coating.

And the main practical difference between the screw is that it is necessary to drill a hole before screwing it in. In this case, you can only work with wood and plastic.

What does a self-tapping screw look like

The self-tapping screw looks like a thin screw with a fairly wide thread pitch from the head to the tip. The tip of the screw is quite sharp. Because of this structure, this fastener got its name, since it cuts itself a course.

It is made from hard steel grades that cannot be bent in any way. Also, the self-tapping screw undergoes a special heat treatment, which increases its strength, in contrast to the screw. Therefore, they can be used for working with plastic and metal.

Visually, you can see that the pitch and height of the thread of the self-tapping screw is greater than that of the screw. And its end is much sharper. Thanks to this, no pre-drilling of holes is required, but the self-tapping screw can be screwed in immediately.

As we said above, many self-tapping screws are galvanized, which makes them corrosion-resistant, unlike a screw.

It is also worth noting that there are a large number of varieties of both screws and self-tapping screws. They have different heads, splines, different threads and tips. But those main differences that we wrote about above are enough for you to always understand what kind of fasteners are in front of you.

And in the video below you can see what to do with a torn off self-tapping screw, the slot of which has erased into one large hole.

We hope that it is now clear why in recent years the market has been almost completely occupied by imported self-tapping screws, and our screws are gradually becoming a thing of the past.

How to choose?

Before purchasing a screw, it is recommended to take into account several parameters:

• the estimated load that will be exerted on the product during operation;
• type of mounting block;
• the dimensions of the future screw, which you can calculate yourself;
• gaps between threads, determined by additional calculations.

On average, screws with sizes from 12 to 220 mm and a diameter of up to 6 mm are considered in demand. The rest of the fasteners should be classified in the specialized class. Special attention should be paid to the middle pitch screws called "herringbone". If you buy them, you will need to additionally purchase special dowels.

When it comes to purchasing dowels on a concrete base, it is better to give preference to models with a cylindrical or countersunk head. If necessary, you can consider in advance the design of such elements and study their features.

The difference between a screw and a self-tapping screw is described in the next video.

What are the self-tapping screws?

The main purpose of the building consumable is clear from the name itself - using a threaded base to punch wood / metal and combine the structural elements into a single whole.Due to the widespread use of self-tapping screws, it can be difficult even for a specialized specialist to understand their varieties.

However, in the production of self-tapping screws, great attention is paid to the type of products. Not everyone has a massive demand, so it makes no sense to buy some forms for machine tools.

Classification of self-tapping screws by purpose

Classic for metal.

The most common version of self-tapping screws, which is optimal for the mass consumer. The key feature is that the threads are very close to each other + the tip of the self-tapping screws itself has a pointed shape.
The length and diameter of self-tapping screws do not have common requirements, so this parameter is selected during production on its own.
For the manufacture of self-tapping screws for metal, it is necessary to use only high-strength steel with galvanized or oxide on top. The colors are black, but there are options for metallic or gold plating.

Self-tapping screw for metal with a drill end.

A variant of self-tapping screws, in which a distinctive feature is a drill-shaped tip for smoother penetration into the thickness of the metal. Good for medium thick sheet plates.
If, when using classic self-tapping screws, you had to use a drill at the initial stage, then here you can skip this moment. It is enough to make some effort, and the self-tapping screw will independently make a starting recess to enter the object.

Self-tapping screw for wood.

You will not notice large external differences in the production of wood screws. The peculiarity lies in the greater distance between the turns. On machines and in workpieces, this nuance is very easily taken into account and does not require additional purchases of raw materials or replacement parts for machines.

Furniture screw.

A furniture screw or, as it is also called, a confirmat is used for the purpose of assembling structures from MDF or chipboard

You can also use a self-tapping screw for expensive types of wood, but this requires great attention to the shape of the cap and the possibility of masking it.

In the production of confirmations, the appearance of the hat is of great importance, since each type of furniture may require its own template. Making such self-tapping screws is problematic, so the option should be considered only if there are wholesale buyers.

Self-tapping screw with a press washer.

Self-tapping screws are a subcategory of metal screws, but due to their functional features, it should be considered as a separate production option

The demand for such self-tapping screws is very high in rural areas, therefore, if you plan to sell products to a similar market, you will not find a better option.

Hexagon self-tapping screw.

Features in production - a thickened screw body and a hexagonal key head. The self-tapping screw can only be used for working with wood and some types of concrete, therefore this production option should also be considered only if there are wholesale buyers.

Self-tapping screw for the roof.

The name speaks for itself. A peculiarity in production - in addition to the self-tapping screw itself, you will also have to make a washer.
Hat, diameter, frequency of turns are variable parameters and depend on the area of ​​application of the consumable building material.

There are other subspecies of self-tapping screws, but their share in the consumer market does not exceed 10%. Therefore, only those entrepreneurs who already have stable purchasing partners and want to further expand their assortment as part of the marketing component of the business should focus on such a product.

What does a bolt look like and how is it different from a screw

As mentioned above, in order to clearly distinguish how a bolt differs from a screw, the definition of each of them should be made according to the fastening method. So, a nut is used as a fixing element for a bolt, and the screw is directly screwed into the depth of the fastened parts and has a counter thread in the second of them.The nuts must have the same threaded hole size as the bolts, otherwise they will not work.

These four factors are related as shown in the figures and in the table below. Example: Two pieces of aluminum are to be connected with a 6mm diameter screw. How deep should the hole be drilled? How deep should the threaded hole be? How much should the screw pierce? What is the diameter of the through hole?

Therefore: 1, 06 '6 mm = 6, 36 mm. If a threaded connection is made between different materials, calculations must be made in accordance with the material that the thread will receive. When you buy a case, it comes with a series of screws and other small parts. It is difficult even for experienced technicians to tell exactly what the use of each of these screws is. In this tutorial, we will talk about all the screws used during chip assembly and where you should use them, so by reading this tutorial you will increase your micron assembly skills.

You can always clarify what kind of design is available for hexagon head bolts, and determine how a screw differs from a bolt, according to GOST 7805-70. It is this document that regulates the production of the named parts and their qualitative and quantitative characteristics.

Most often, universal bolts with full threads are made, but there are also options with incomplete threads - for fastening flat parts of large thickness. By the principle of fastening, you can also understand how a bolt differs from a screw. Indeed, when using a bolt, its second end always comes out of the fastened part and is fixed with a nut, while in the screw it is hidden inside the part. When considering the design features, it has already been mentioned how a bolt differs from a screw, and it is for this difference that bolts are designed to connect two flat parts, and screws are for a flat part with products of any thickness.

Figure 1: Different types of screws used in micro. Screws differ in three aspects: thread type, head shape and length. The length and especially the shape of the head can vary greatly, but only three types of thread are used in the microrelief. Therefore, we believe that the best way to sort the screws found in micro is the type of thread they use. In Figure 2, you can see these three types of streams.

Figure 2: Types of threads used by screws that enter the body. The first type of thread, shown on the left in Figure 2, is the type of self-tapping used to secure the fans to the chassis. This is the only use of this type of screw in a trace element, which is very easy to identify as you can see. This screw is usually 10 mm long and has a flat head as shown.

Bolts, moreover, when fastened to a nut under the influence of vibrations or when connecting wooden parts, tend to self-loosen. To prevent this, put a locknut on the bolt (the second after the first) or use self-locking nuts.

To prevent the bolt from damaging soft material, such as wood or plastic, and to prevent the fastener from pushing through the soft material under stress, a washer is placed under the bolt head. For more reliable connections, use two washers, placing the second under the nut.

Figure 3: Screws used to secure fans and air ducts to the cabinet. You must use a # 2 Phillips screwdriver to tighten this type of screw. To facilitate this, we will refer to this "thick" thread from now on as the third type of thread is thinner.

This means using a wire with a diameter of 3 mm with a distance of 0.5 mm between the wires. For simplicity, we will refer to this type of thread from now on as it is thinner than the other two thread types used by micro screws. Screws that use both thick thread and thin thread can be found with several different head types and lengths, and this is where most people get confused.Therefore, we will talk in more detail about all the screws used in the micro.

Differences

Screws differ from self-tapping screws in the width of the rod on which the thread is cut. The first ones have a thick base, they are able to withstand a large fracture load, but to screw them in, you must first drill a hole equal in width to 70% of the screw diameter.

For self-tapping screws, the thread on the rod almost completely covers the cylindrical surface. They are less durable, but can be screwed into almost any surface without preparation. Self-tapping screws are made from carbon steel, stainless steel or brass and are used for working with drywall, timber, roofing materials, metal profiles, sheet metal and window profiles.

Self-tapping screws with a drill are designed for working with metal. There is a small drill at the tip that drills a hole in the base material. The use of such fasteners can reduce the time required to complete the job. They are mainly used in the installation of corrugated board.

Self-tapping screws that do not require drilling are used to fasten soft wood: solid boards, floorboards or picket fences. Such self-tapping screws have a wavy thread and, when screwed into the material, do not allow the wood to delaminate.

Difference between screw and screw

The screw thread is different from the screw thread. The screw has a thread with a triangular profile and more pronounced, that is, with a significant distance between height and depth. This is the main difference between a screw and a screw that has a smaller thread.

What are common and what are the differences

The screw is equipped with a head adapted for tightening with a screwdriver or screwdriver. It only takes a little force to drive the screw into or out of the material, and the fastener will easily connect or disconnect the two surfaces.

Screws are threaded fasteners. Screws and self-tapping screws also belong to fasteners, being hardware, and unlike screws, as already mentioned above, they have a larger pitch and thread height. The main material for the manufacture of both screws and screws is steel with various strength classes. Zinc is used as a protective coating for screws and screws, with different application technologies on the product.

For high resistance to corrosion, screws and screws are manufactured from stainless steel and acid-resistant steel. However, additional methods of protecting screws from corrosion are passivation, phosphating, coating with special dyes. Both screws and screws are standardized according to GOST, DIN, ISO. You can even say that a screw is a kind of special screws.

Varieties of screws

Screw heads have different designs (hex head, round head, countersunk head, half-countersunk head) for different fastening tools. The main difference between the screws is that there is no need for threading. There are many types of screws.

For example, ceiling. They are recommended for fastening gypsum plasterboards, wood and chipboard through heat-insulating material to metal frames and sheets, to wood. The special shape of the countersunk head and the long length allow for a stable fixing to the ceiling through suspended structures. Agree, an ordinary screw is unlikely to be useful for such work. This confirms our conclusion that the screw is a specialized screw.

Universal self-tapping screws are indispensable for any construction. They have a thin core and a high crest. Suitable for wood, chipboard, plastics, thin non-ferrous sheet metals and sheet metal without pre-drilling.