≡× MENU

• Interior
• Window
• Walls
• Projects
• The buildings

Size range of self-tapping screws for wood, metal, chipboard, fiberboard. roofing screws. marking. gost. What screws to use and what to fasten: types of screws Group 01 material for screws

GOST 27017-86 defines a screw as fastener in the form of a rod with an external special thread, a threaded conical end and a head at the other end, forming a thread in the hole of the wooden or plastic product being connected. From this definition it becomes clear that a screw is screwed into a previously prepared hole and is used for fastening to wooden or plastic bases. Such screws, usually made from low-carbon steels (St1, St2, St3, 10kp), less often from corrosion-resistant steels without coating and from brass, have traditionally been produced and are still produced by the domestic hardware industry.

However, fasteners have long appeared on the Russian market that, by formal definition, correspond to the term “screw”, but have significant differences:

• their basic structural elements: heads, rod threads, ends and splines;
• high-quality steels and alloys with modern protective decorative coatings.

As a result, the functionality these products:

• it has become possible to install them without pre-drilling holes, which significantly simplifies and speeds up the installation process of the fastened products;
• The range of materials in which these products can be installed has expanded: steel, aluminum and copper alloys, composite materials, concrete, and brick have been added to wood and plastic.

Such significant differences between the new products and screws required the emergence of a special term. And such products began to be called self-tapping screws, in short - self-tapping screws.

The main structural elements of screws or self-tapping screws are:

• head - part of a fastener having a rod, which serves to transmit torque and form a supporting surface;
• spline - a specially shaped recess at the end of the head, which serves to transmit torque from the tool;
• threaded rod;
• end.

Main types of self-tapping screw heads

The use of one type of head or another is determined by the installation conditions and features. Most frequently used following types heads:

Main types of self-tapping slots

The following types of self-tapping screw slots exist:

The main dimensions of the slots of Phillips, Pozidrive, TORX screws

Each of the main types of splines also differs in size. In this case, for each type of spline a standardized and numbered row is formed:

• Phillips slots: Ph0, Ph1, Ph2, Ph3, Ph4;
• Pozidrive splines: Pz0, Pz1, Pz2 Pz3, Pz4;
• TORX slots: T (or TX) 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 27, 30, 40, 45, 50, 55, 60, 70, 80, 90, 100.

The differently positioned edges of the Pz slot form a more stable grip with the tool, which reduces its wear and reduces the likelihood of “breaking”. This makes it possible to apply more torque to the tool.

Russian version of the TORX slot according to GOST R ISO 10664-2007 (dimensions in mm)

For each type of slot and its size (number), a strictly appropriate tool is required: a screwdriver or a bit. Otherwise, rapid wear or even destruction of the drive elements is possible.

Main types of self-tapping screws

Depending on what materials need to be connected, choose a self-tapping screw with one or another type of thread. In this case, the following traditional quantitative characteristics for threads are taken into account:

• diameter;
• number of visits.

But besides them, the angle at the top of the thread profile α has a significant influence on the self-tapping properties of the product. The smaller the specified angle, the easier the product is twisted, the easier the thread is formed in the hole, and the higher the self-tapping properties.

Traditional screws produced by the domestic industry (GOST 1144-80, GOST 1145-80) have this angle equal to 60º, like a metric thread.

Modern self-tapping screws are made with an angle α=45º and less. Such sharp threads are especially effective when installing products in relatively soft materials: wood, chipboard, plastic, etc.

Self-tapping screws intended for screwing into metal (DIN 7976, 7981...7983) are manufactured with large angles(mostly 60º) to increase the strength of the thread at the base of the profile. Besides cutting edge The product is subjected to special hardening heat treatment, which ensures a hardness of 450HV.
Metal self-tapping screws are highly standardized products and their threads are manufactured according to ISO 1478, EN 2478, DIN 7970 standards. In the drawing and design documentation, the letters ST (SCREW THREADS) are placed in front of the diameter of their threads.

The table shows the main dimensions for sharp (type C) and blunt (type F) ends.

To reduce the time of screwing into wood, as well as to prevent cracking of wood, special notches are used on the thread, creating additional cutting edges, and the actual wavy cutting edge of the thread.

Main types of self-tapping screw ends

Depending on the installation technology, the self-tapping screw should be selected with one end or the other. The most common screws are those with a traditional sharp end, which may differ from each other in the angle of entry β. It is clear that as it decreases, the introduction of the rod into the material becomes easier and the self-tapping properties of the product increase.

For traditional screws (according to GOST 1144-80, GOST 1145-80, GOST 1146-80) this angle is 40 degrees.

For popular drywall screws (the so-called “black”) it is much smaller: 26...280.
Widespread universal ones have even less: 20...300.

To increase self-tapping properties, special end designs are used.

The most effective in this regard are self-tapping screws with a drill (drill-tip). During installation, they act like a sequentially working drill and self-tapping screw. First, the drill creates a hole in the base material, and then a self-tapping screw is screwed into it. In this way, installation occurs as a single screwing operation.

Dimensions of screws and self-tapping screws

There are two main sizes for screws and self-tapping screws: diameter and length.

The nominal diameter of a screw or self-tapping screw is taken to be the diameter of the circumference of the protrusions of its thread.
Currently, screws are produced in the following diameters: 1.6, 2.0, 2.2, 2.5, 3.0 (2.9), 3.5, 3.8 (3.9), 4.0, 4.2, 4.5, 4.8, 5.0, 5.5, 6.0, 6.3, 7.0, 7.5, 8.0, 10.0, 12.0 mm.

It should be borne in mind that a self-tapping screw of one type or another is not necessarily available in all possible diameters. Most wide range diameters produced have universal self-tapping screws, specialized self-tapping screws have narrower size ranges.

The length of a self-tapping screw or screw is measured differently for a countersunk and convex head of a product. For a countersunk one, the nominal length is taken to be the full length of the product, and for a convex one, the distance from the supporting surface of the head to the end of the screw.

The lengths of screws and screws are normalized and have the same size range: 4.5, 6.5, 7, 10, 11, 12, 13, 14, 16, 18, 19, 20, 22, 25, 29, 30, 32, 35, 36, 38 , 40, 41, 45, 50, 51, 55, 57, 60, 64, 66, 70, 76, 80, 89, 90, 100, 102, 120, 140, 160, 180, 200, 230, 250, 280 , 300 mm. Other lengths may be available for some specialized products. Naturally, screws of the same diameter are available in a limited range of lengths.

The choice of diameter and length of the screw will be determined primarily by the load that the connection must withstand, and also by the dimensions of the parts to be connected, the installation material and other factors. When determining the diameter of the screw to be screwed into a plastic expansion dowel, you should rely on the manufacturer’s recommendations given in catalogs or on the packaging of the dowels. The fact is that, on the one hand, the larger the diameter of the screw, the stronger the connection, but, on the other hand, the torque required for installation increases. And then the capabilities of the tool may be exceeded or the head of the screw may be torn off.

The length of the screw (Lsh) is calculated as the sum of the nominal length of the dowel, (Ld) the thickness of the attached part (S) and the diameter of the screw (d). The last term ensures that the end of the self-tapping screw comes out of the dowel.

For classic screws (with an angle at the end of 40 0) this is enough, but for pointed screws, the length of the required screw must be increased so that its entire tip comes out of the dowel when tightened.

Among the wide variety of fasteners, it is difficult not to get confused. Self-tapping screws and self-tapping screws are fasteners consisting of a rod with a sharp thread and a head. They are different in length, thickness, material, shape, purpose. For a certain type of work, specific screws are used. There are, of course, universal fasteners, but they are not always suitable and will securely secure this or that material. Let's take a closer look at their purpose.

What is the difference between a self-tapping screw and a screw? The main difference is in the carving. The self-tapping screw barrel consists entirely of a threaded part or has a length of the smooth part that is shorter than the threaded part. The tip of the self-tapping screw is sharper than the end of the screw. Screws are made from soft species steel, self-tapping screws - hard.

Modern self-tapping screws are made from special hardened steel and are protected from corrosion. Due to surface treatment, hardware is produced different colors. Most often they are galvanized (yellow and silver color) or black (oxidized or phosphated).

According to the area of ​​application, self-tapping screws differ as follows:

For wood material

For drywall

For metal sheets

For sandwich panels

For window profiles

Self-tapping screws for wood and plastic

They differ from all others by their rare thread pitch. They look like a trunk with sparse carvings and a countersunk head; the head is easily recessed into the wood and does not interfere with further surface processing of the material. Rare pitch on the screw made with structure in mind wooden materials to avoid wood crumbling and more secure fastening.

Used as a drywall fastener to wooden sheathing, for fastening wooden elements each other without pre-drilling holes. Black screws are most often used for this.

Furniture self-tapping screws (confirmat, euroscrew)

Used in the production and assembly of furniture. Made in the form metal rod with sparse and high carvings, and a blunt end. The cap is flat in shape, there is a thickening near the cap. During installation, as a rule, a 6-diameter hexagon wrench is used. Requires pre-drilling. The heads can be covered with decorative ones.

Self-tapping screws for window profiles

They look like a rod with a drill at the end or a sharp tip and a countersunk head. Mainly used in production plastic windows for panels to metal profiles. Material - steel, coating - white and yellow zinc.

Screw for concrete

Sometimes called a dowel. They are used to fasten parts to a solid base. The most common dowels are divided into two types:

With cylindrical head;

With a hidden head.

They have a special uneven thread along the entire length to create special fastening strength. Pins are used for fastening wooden and aluminum structures to a concrete (brick) base.

Capercaillie screw

Very thick screw, perfect for heavy structures, where special strength is needed (slats, beams, bars, and so on). Requires pre-drilling of the hole. Hex head, wrench or hex bit. The thread can be located along the entire length or slightly short of the head. This fastener is often used for installing plumbing fixtures and water heaters. The fastening with the help is very durable and can withstand quite high loads. Before screwing, you must first make a hole with a drill.

Having become familiar with the types of screws and their purpose, you can securely fasten any elements together. You can buy self-tapping screws of any type in the Dom online store with delivery or pickup.

Unfortunately, history has not preserved the name of the inventor of the miracle screw, but it is reliably known that he was one of the emigrants who arrived in the USA in late XIX- the beginning of the 20th century, at the moment he became a millionaire! However, such a story is more like a plot for a film about the “American Dream”, where a poor man in a short time becomes the ruler of minds and hearts.

According to other sources, an engineer from the Gypsum company was involved in the development of the self-tapping screw; in the late 60s of the 20th century, he improved an ordinary screw on the instructions of his director Rex Selby, who was engaged in the production of plasterboard structures.

Today, when the world no longer cares who was first, self-tapping screws are produced everywhere, and their use in some closed production cycles already in the late 70s on the territory of the USSR speaks of the real benefits and necessity of such an assistant.

Actually, in the 80s, self-tapping screws were already standardized, and they could be found in hardware stores. This simple-looking invention became widespread during perestroika and the collapse of the Union, when the same drywall and the black phosphated metal screw used with it poured into the domestic market.

If you think that we are still using the same developments of the 60s and 80s, then this is a mistake. Approximately once a month, a patent for the invention of a new type of self-tapping screws is issued around the world. Therefore, builders can only adapt to market offers and actively implement them in their work.

Opening a bottle of wine using a self-tapping screw is a favorite method of home craftsmen who never part with their tools. First, use a screwdriver to screw a self-tapping screw into the cork to the middle, and then pull it out together with pliers or pliers.

Types of self-tapping screws - what are they?

Today there are many types of self-tapping screws. Only by the type of thread they are divided into self-tapping screws with universal thread, rare thread pitch and frequent thread.

For example, if you need to fix a heavy shelf on a plasterboard wall, you need to use self-tapping screws with a frequent thread pitch, having previously determined the location of the metal profile using a magnet and drilled a hole in it equal to internal diameter self-tapping screw threads.

Self-tapping screws with a rare thread pitch are designed for screwing into soft materials (plastic, plaster, asbestos, wooden board). Not long ago, self-tapping screws for concrete appeared on the market, screwed without a dowel, directly into the drilled hole. When screwing such screws into porous material Drilling holes is not permitted. Self-tapping screws with a herringbone profile can be classified as “eternal” type.

They are driven into the surface at the same time as the dowel and are good for fastening stretch ceiling or installation window frames. There are self-tapping screws, a hex key and masked in a separate block decorative plugs. To perform other work, there are universal self-tapping screws designed for screwing into any surface.

Choosing the right self-tapping screw!

First of all, the self-tapping screw must be selected according to the degree of load placed on it. In general, they have a greater shear and bending strength than conventional screws. The main thing is to take into account the porosity and structure of the material. in which it is attached.

That is, the more porous the wall structure, the thicker and longer the dowel should be, and therefore the length of the screw. The use of self-tapping screws is very extensive. In construction, they can be used not only to attach the cladding to the supporting frame, but also to create the frame itself.

Self-tapping screws found wide application and during assembly frame houses and production roofing works. Each screw is equipped with its own washer with a seal, which prevents water from entering the place where the screw is screwed in.

Using self-tapping screws for thin plates, it is very easy to install chimney systems from sandwich pipes. They can perfectly replace standard fastening clamps, which are not always capable of reliably clamping pipes at the junction. But let’s say in advance that riveting will be much more reliable in terms of connecting forever.

Table: Types of popular self-tapping screws, their purpose, types and sizes

Self-tapping thread pitch	Scope of application of self-tapping screws	Self-tapping screw diameter, mm	Range of screw lengths, mm
Average	Universal screws designed for all types of fastening	3.0:3.5:40: 4.5; 5.0; 6.0	12; 16; 20; 25; 30; 35: 40; 45; 50: 60: 70: 80: 90:100:120:140; 160; 180; 200; 220
Frequent, carving in two passes	Self-tapping screws for fastening to metal sheets up to 0.9 mm thick without dowel. Pre-drilling of the hole is required.	3.0;3,5;4.0; 4.5; 5.0; 6.0; 8.0	12; 16; 20; 25; 30; 35: 40; 45; 50: 60: 70: 80: 90:100:120:140:160; 180;200
Rare	Self-tapping screws for fastening to soft materials without dowels ( soft varieties wood, plastic, gypsum)	3.5; 4.0; 4.5; 5.0	16; 20; 25; 30; 35: 40; 45; 50; 55; 60; 70; 75; 90:100:125:150
Medium, herringbone profile	Self-tapping screws for fastening to concrete or brick walls by hammering into a dowel	3,0;3.5;4,0; 4,5; 5.0; 6.0; 8.0	12; 16; 20; 25; 30; 35: 40; 45; 50: 60: 70: 80: 90:100:120:140:160; 180; 200
Asymmetric	Self-tapping screws for fastening elements modern furniture made of wood. Chipboard boards, plywood. It is necessary to drill a hole with a diameter of 4.5 or 7 mm.	5.0; 7.5	40; 50; 60. 70
Variable with notch	Self-tapping screws for fastening to concrete or brick walls without dowels (dowels). It is screwed into a hole with a depth of 15 mm greater than the length of the self-tapping screw.	7.5	70; 90; 110:130; 150; 180; 200

Types of self-tapping screws: heads

Wholesale Sale Multicolor Fashion Jewelry CZ Gold 26 Pendant in…

108.54 rub.

Free shipping

★★ ★★ ★★ ★★ ★★ (4.90) | Orders (2107)

Women's Corduroy Casual Long Sleeve Printed Sweatshirt…

In all types of repair and construction work, when finishing various rooms, are widely used in the production of furniture and other structures different kinds self-tapping screws The article will tell you how wood screws differ from other types and what sizes they come in.

A self-tapping screw is called universal fastener in the form of a metal rod with a cap and external thread. When screwed into the materials being fastened, the sharp edge of the threaded spiral independently forms in the material internal thread, which ensures a reliable connection.

There are several types of self-tapping screws, the choice depends on the specific purpose. The main parameters by which they distinguish this type fasteners, this is the manufacturing technology (determines corrosion resistance), the pitch of the threaded spiral (different for different materials) and size.

Helpful information:

Types of self-tapping screws according to manufacturing technology

Regardless of the type of product, they are made from brass, stainless steel, or high-strength carbon steel. The latter are divided into the following types:

This type of fastener has a matte black color due to treatment with phosphates. Black wood screws are characterized by low corrosion resistance, but are easily screwed into any materials. The most inexpensive in price. They are used for both wood and metal, but only where they are not exposed to high humidity. For example in a room.

Also black, only with a shiny surface. Thanks to the oxide film, such screws are more resistant to corrosion.

Treated with chromic acid, they have a silver color. Stainless chrome plated self-tapping screws are scratch resistant due to the formed protective film. Decorative, used in prominent places.

Self-tapping screws for wood. Silver or yellow color, depending on the type of zinc alloy with which the product is coated. The zinc layer provides high stability to rust. Such self-tapping screws can be used in any premises and structures, but they are also more expensive.

In addition to galvanization, they have one more protective layer, formed by treatment with chromic acid. This type of fastener is resistant to corrosion and mechanical damage. Yellow wood screws are used in cases where fasteners with decorative qualities, for example, when assembling furniture (with fittings of the corresponding color).

When choosing the color of self-tapping screws for fastening wooden structures, it is necessary to take into account the level of humidity that will affect them. For service on outdoors or in damp areas It is worth purchasing a galvanized, chrome-plated or yellow-passivated version.

Varieties by type of thread

Another important parameter for choosing self-tapping screws is the pitch of the threaded spiral. There are three main types, they can be seen in the table below:

Type of thread	Appearance of the self-tapping screw	Scope of application
Rare pitch (large carving)		They are used when working with wood, as well as for fastening parts made of MDF, particle boards, plasterboard and fiberboards.
Frequent pitch (fine thread)		Designed for fastening elements made of hard wood, as well as.
Double thread (variable thread)		Used for fastening materials with different densities (for example, for fastening drywall to a wooden base)

When working with wooden structures Self-tapping screws with a rare thread pitch are usually used. It is this structure that allows for maximum preservation of the structure of the materials being bonded. For the same purpose, before screwing a self-tapping screw into wood, a hole of a smaller diameter than the screw itself is first drilled in it (the diameter is measured by the thread). Some craftsmen additionally moisten the product with oil to facilitate screwing and reduce the destructive effect on the wood. The fasteners are screwed in using a screwdriver of the appropriate shape or a screwdriver.

In addition to color and thread, it is worth paying attention to the structure of the screw head. As a rule, self-tapping screws designed for working with wood have a flat or slightly concave head that completely fits into the material being fastened and does not protrude above its surface. This type is also called secret. Some varieties are closed on top with a decorative button in the color of the material (for example, when assembling furniture).

size table

The last parameter with which it is important not to make a mistake is the size of the fastener. It depends on the type and scale of the structure being fastened. Size chart existing species The range of self-tapping screws is very extensive (more than 30 options), which allows you to choose the right fastener for any type of work.

The length of the products ranges from 11 to 200 millimeters, outside diameter(by thread) - from 2.5 to 6 millimeters. The self-tapping screw must be long enough to external element it could pass right through, and in the second go deeper by at least ¼ of its thickness, and if possible more. Then the fastening can be considered reliable.

The dimensions of the main types of wood screws are shown in the table below:
Type of screw and standard dimensions (mm x mm)

Black	Galvanized and yellow passivated
3.5x16	3x12
3.5x19	3x15
3.5x25	3x20
3.5x32	3x25
3.5x35	3x30
3.5x41	3x35
3.5x45	3x40
3.5x51	3x45
3.5x55	3x50
3.8x25	3.5 x (20-70mm)
3.8x32	4x (20-70 mm)
3.8x35	5x (20-100 mm)
3.8x41	6x (30-200 mm)
3.8x45
3.8x51
3.8x55
3.8x64
3.8x70
3.9x70
4.2x65
4.2x70
4.2x75(76)
4.2x90
4.8x95
4.8x100(102)
4.8x110
4.8x120
4.8x125(127)
4.8x140
4.8x150 (152)

Knowing the size of the parts that need to be connected, as well as existing sizes self-tapping screws, it will be easy to choose the appropriate fasteners for each type of work.

Lots of shiny fasteners on the shelves construction stores pleases the eye, but makes every person not professionally involved in the sale of fastening equipment stomp awkwardly around the display window. The purpose of half the screws is unclear, and it’s awkward to ask the seller... Let’s try to understand the variety of screws - self-tapping screws presented on modern market. After 5 minutes, you will be surprised to find that everything is much simpler than it seems.

The screw is a self-tapping screw. Where does the confusion come from?

What is the difference between a screw and a self-tapping screw? I suggest you look into GOST 27017-86, which gives the following definition of a screw:

A screw is a fastener in the form of a rod with an external special thread, a threaded conical end and a head at the other end, forming a thread in the hole of the wooden or plastic product being connected.

As follows from a document dated 1986, the use of this type of fastener involved pre-drilling a hole and limited the material of the fastened elements to wood or plastic. For this type of screws, brass, low-carbon steels (St1, St2, St3, 10kp) or corrosion-resistant steels without galvanic coatings. As a fastener, the classic screw is not very popular, but today it is still found as cheap alternative self-tapping screws

The self-tapping screw is a new stage in the evolution of fasteners. Formally, it corresponds to the definition from GOST, which we cited above, but has significant design differences (shape of slot, coil, thread and tip) and is made of high-quality steels with corrosion-resistant coatings.

As the name suggests, the self-tapping screw can cut threads on its own and is used without pre-drilling holes. Self-tapping screws can handle not only wood and plastic, but also metals, concrete, brick, etc. Given the variety of fasteners, it is useful to know their sizes and classification. Below are convenient tables for each type.

Transcript example

Screw 1 - 4×25 GOST 1145-80

Screw 4mm diameter, 25mm long, low carbon steel, unplated

Standardized labeling looks like this, but in practice everything is much simpler. On the box that you take from the shelf, only the purpose of the screws and their sizes will be written.

Standard sizes of self-tapping screws

The size of a self-tapping screw is determined by only two quantities: length and diameter.

Universal screws

They are usually made with incomplete threads. Used for wood, chipboard, etc. soft materials. Self-tapping properties are low. By standards GOST 1144-80, 1145-80 , 1146-80 Available in diameters 1.6, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 8.0, 10.0 mm and lengths 13, 16, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 120 mm.

Ø,mm	length, mm	Ø,mm	length, mm	Ø,mm	length, mm	Ø,mm	length, mm	Ø,mm	length, mm
2.5	10	3.0	10	3.5	10	4.0	13	5.0	16
	13		13		13		16		20
	16		16		16		18		25
	18		18		18		20		30
	20		20		20		22		35
	22		22		22		25		40
	25		25		25		30		45
			30		30		40		50
					40		45		60
							50		70

Self-tapping screws for wood, chipboard, fiberboard, plastics

One of the most common self-tapping screws. Used for installation in dowels. Available with galvanized coating ( white) or galvanized and chromate passivated (yellow), sometimes treated with phosphate.

Ø,mm	length, mm	Ø,mm	length, mm	Ø,mm	length, mm	Ø,mm	length, mm	Ø,mm	length, mm	Ø,mm	length, mm
3.0	10	3.5	10	4.0	12	4.5	16	5.0	16	6.0	30
	12		12		16		20		20		40
	16		16		20		25		25		45
	20		20		25		30		30		50
	25		25		30		35		35		60
	30		30		35		40		40		70
	40		35		40		45		45		80
			40		45		50		50		90
			45		50		60		60		100
			50		60		70		70		120
					70		80		80		140
									90		160
									100		180
									120		200

Wood screw with hexagonal head

DIN 571 and GOST 11473-75. Designed for fastening joists, slats and other tasks that require reinforced fixation. As a rule, it is produced galvanized.

Ø,mm	length, mm	Ø,mm	length, mm	Ø,mm	length, mm	Ø,mm	length, mm
6.0	30	8.0	40	10	40	12	100
	40		50		50		120
	50		60		60		140
	60		70		70		160
	70		80		80		180
	80		90		90		200
	100		100		100		230
	120		120		120		250
	160		140		140		280
	180		160		160		300
			180		180
			200		200
					220

Screws for fastening to metals

Screws according to DIN 7981, DIN 7982, DIN 7982

Visually similar to universal ones, but differ in materials of manufacture, entry angle and thread profile angle (up to 60 degrees).

Ø,mm	length, mm	Ø,mm	length, mm	Ø,mm	length, mm	Ø,mm	length, mm	Ø,mm	length, mm	Ø,mm	length, mm
3.5	13	3.9	13	4.2	13	4.8	16	5.5	16	6.3	16
	16		16		16		19		19		19
	19		19		19		22		22		22
	22		22		22		25		25		25
	25		25		25		32		32		32
	32		32		32		38		38		38
	38		38		38		45		45		45
			45		45		50		50		50
			50		50		60		60		60
							70		70		70
							80				80

Screws according to DIN 7504

Structurally almost completely identical to pointed screws for metal DIN 7981, 7982 , 7983 (see table above). The key difference is the tip that performs the function of a drill.

Ø,mm	length, mm	Ø,mm	length, mm	Ø,mm	length, mm	Ø,mm	length, mm	Ø,mm	length, mm	Ø,mm	length, mm
3.5	13	3.9	13	4.2	13	4.8	16	5.5	22	6.3	22
	16		16		16		19		25		25
	19		19		19		22		32		32
	22		22		22		25		38		38
	25		25		25		32		45		45
			32		32		38		50		50
			38		38		45
							50

Self-tapping screws for sheet metal and metal-based products

Self-tapping screws with press washer

They are found on sale with both a drill (for metal up to 2mm thick) and a sharp tip (designed for metal up to 0.9mm). Standard diameters 4.2 (4.0) mm and length - 13, 14, 16,
18, 19, 22, 25, 32, 41, 51 mm.

Self-tapping screw with a semi-cylindrical head (“bug”)

Similar to its predecessor, it can be either sharp or with a drill. There is no size guide for this self-tapping screw and it comes in only one size option:

With sharp tip - 3.5 x 11

With drill tip - 3.8 x 11

Hex head screws

Designed to work with sheet metal without preliminary hole preparation. Provide reinforced fastening. From one manufacturer to another, variations in product sizes for a given segment of fasteners are possible. The tables below show the most popular ones.

With a sharp tip.

For metal sheets up to 0.9 mm.

With drill (DIN 7504-K)

For metal of large thickness (5mm or more). The length of the drill tip determines the swing. sheet metal thickness.

Ø,mm	length, mm	Ø,mm	length, mm	Ø,mm	length, mm	Ø,mm	length, mm
4.2	19	4,8;5,0	14	5.5	19	6.3	19
	21		19		25		25
	25		25		32		32
	32		38		38		38
			45		51		45
			51		64		51
			64		76		64
			76				76
							90
							102
							127
							152

Self-tapping screws for drywall

Manufactured with a countersunk conical reduced head, a Phillips slot, a double-start variable thread and a sharp tip. Dimensions of fasteners for mounting on wooden frame or a metal profile with a thickness of less than 0.9 looks like this: Ø 3.9 mm with lengths 19, 25, 30, 45 mm.

Self-tapping screws for fastening slabs and sheets of chipboard, fiberboard, plywood

As a rule, these are galvanized screws (FLUGEL) measuring 5.0 x 36

Available with a countersunk conical head and notches for countersinking a countersunk hole ( DIN 7504P) with dimensions:

Roofing screws

When installing the roof, it is advisable to use standard galvanized self-tapping screws. They are resistant to corrosion. The size chart looks like this:

Ø,mm	length, mm	Ø,mm	length, mm	Ø,mm	length, mm	Ø,mm	length, mm
4,80	20	5,50	19 (20)	6,30	19 (20)	7,00	122
	29		25		25		142
	35		32		32		162
	38		38 (40)		38 (40)		177
	50		51 (50)		50
	60		64 (62)		60
	70		76 (78)		70
	80		100		80
			115		90
			130		100
			150		130
			180		150
			235		175
					200
					235

Roofing screws with painted heads are available. The paint provides additional protection against exposure external factors. And they do not spoil the exterior of the roof, since they are “selected” by color.

Screws and self-tapping screws for special purposes

Confirmations

Confirmat or “euro-screw” is a separate category of fasteners. It is designed to be assembled furniture panels. It is made with various protective and decorative coatings (usually galvanized). The thread pitch is rare. The task is to pull the parts together. The head has a characteristic difference. A special hexagon is required for screwing.

Screws for concrete

Screwed into a pre-drilled hole. It is not recommended to use a hammer drill. Hence the complexity of the process. Before screwing in, you need to add a drop of machine oil - this will make the procedure a little easier. A type of fastener that is called “forever”. Withstand high loads (up to 100 kgf). Available in: Ø 7.5 mm. Length: 50, 70 (72), 80, 90, 100, 120, 130, 140, 150, 160,180, 200,... mm.

Window screws

No hole preparation is required. They work as “amplifiers” of windows and have the following dimensions: Ø 3.9 mm, lengths: 13, 16, 19, 22, 25, 32, 35, 40 (38), 45 mm.

Frame screws

Large screws with high strength. They are screwed into the dowel and sometimes come complete with it.

Adjustment screws

A characteristic feature is the second thread. The first thread (usually smaller) is necessary for fastening to the base, the second is used for mounting the substructure.

Popular screws are ∅6 mm screws and lengths: 60, 70, 80, 90, 100, 110, 120, 130, 145 mm.

Scaffolding screws

Screws-nails

Screws for hangers

They are very convenient in everyday life, for example, we have had a children’s swing hanging on such fasteners for several years in the corridor of a city apartment. Time to install and remove is literally 1 second! Single standard there is no size specification for this element and each production creates a size range at its own discretion.

Cheat sheet for the home handyman

The following tables will help you navigate when choosing the necessary fasteners.

We distinguish the product by the type of thread

Self-tapping screws vary in the frequency of turns. The small pitch allows the fasteners to be used for metal parts. Screws with rare threads are designed for materials with low density. This includes: asbestos, gypsum, plastic, etc. By appearance Self-tapping screws can be classified as follows:

Thread pitch	Special purpose
	Universal screws. Designed for fastening objects made of any materials (they are the most common).
Frequent, with thread in double approach	Designed for attachment to metal profiles up to 0.9 mm thick without the use of dowels (required preliminary preparation holes, are produced with a drill at the tip and are very expensive).
	Self-tapping screws for attaching parts made of soft materials (wood, gypsum plastic, asbestos, etc.) without the use of dowels.
Average, s herringbone profile	Self-tapping screws for screwing into reinforced concrete or brick building objects using the method of driving into a dowel.
Asymmetrical	Self-tapping screws for fastening elements of modern furniture made of wood, chipboard, plywood, etc. (pre-drilling a hole with a diameter of 4.5 or 7 mm, respectively, is required).
Alternating with notches	Self-tapping screws for attaching to reinforced concrete or brick details buildings without dowels (dowels), (screwed into a hole with a diameter of 6 mm and a depth of 15 mm greater than the submersible part of the screw).

It's all in the hat

Based on the shape of the cap, you can determine the intended purpose of the self-tapping screw. The relationship between these parameters is shown in the table:

Type of cap	Features and purpose
Secret	After screwing in, the cap is completely recessed into the object being fixed without a protrusion.
Profile - hemisphere	Firmly holds the attached part due to the increased area of ​​the clamping cap.
Profile - hemisphere with a small press washer	Possesses larger area work surface cap and its reduced height. Used when installing sheet materials.
Small secret	It has a small working area and a gentle transition from the cap to the threaded barrel. During installation, it is fixed both in a stationary object and in an attached part. Allows you to apply significantly more force during installation than with a conventional countersunk head.
Profile - hemisphere with a large press washer	It has a larger working clamping area and a lower head height. The intended purpose is to attach low-density sheet parts.
Hexagonal	The configuration of the head allows you to tighten the screws with less effort, achieving strong pressure on the objects being fastened.
Funnel-like secret with a thickening on the body of the rod	Allows you to mask the connection. Allows you to cover the cap with a decorative plastic cover. Screwed in with a specific key (4 mm).

The fact that a lot of effort was spent on screwing it in does not indicate the titanic torment that will have to be endured if the need arises to unscrew the screw. Therefore, every time a “forever” method is recommended, it is worth thinking about the feasibility. Manufacturers offer a variety of self-tapping screws, differing in the metal from which they are made. The cost also varies. In order not to overpay, you need to give an objective assessment of the load to which the fastening unit will be subjected. If we are talking about a “carnation” for a painting on wooden wall, it makes no sense to spend money on expensive screws.

The screwing tool can be used both manually and electrically. Often a screwdriver is sufficient. This method will not allow you to achieve high performance labor when it comes to professional work and large volumes of fasteners. A familiar screwdriver is optimal for the job.

Slit - smiley :) Incredible but true

The Japanese plant Komuro Seisakusho has released a batch of fasteners with a non-standard slot in the shape of a smiley face. The author of this funny idea is designer Yuma Kano. Unfortunately, the new product has not yet been presented on the domestic market.

We hope that now you have once and for all figured out the issue of the purpose and size of fasteners. We will be grateful for recommendations, criticism and detected inaccuracies.