Wood screws

How much do wood screws cost - an overview of prices for 1 kg

Fasteners are sold both in stores within walking distance, and in retail chains of building materials and metal products, as well as in organizations specializing in similar products. If in small stores self-tapping screws are sold by the piece and by weight, then in specialized organizations they are sold only by weight. The following table shows the average cost of various types of self-tapping screws, as of the beginning of the third quarter of 2018, when they are sold through retail chains.

Self-tapping screws

In hardware and fastener stores, you can always find self-tapping screws of the required standard size and in accordance with the intended use

Species overview

Self-tapping screws with a pointed tip can be classified according to different criteria. So, depending on the type of head, they are divided into the following models.

Hex head products

Such devices are outwardly similar to ordinary bolts. But they are distinguished by a rare screw thread and a slightly sharpened tip. These samples, as a rule, are taken for fastening large massive wooden structures.

Fasteners with press washer

These fasteners differ in the increased area of ​​the contact area of ​​the head area. The press washer allows you to press wooden or metal boards as tightly as possible (but their thickness should not exceed 10 millimeters).

Countersunk Locks

Most often they are used for fastening wooden sheets, but they can be used for metal as well. These types are considered universal options, they have an average thread pitch, their heads are distinguished by a special reinforced emphasis, but when fixing them in the material, you should not apply a lot of physical effort.

Hemispherical head retainers

Similar options for fasteners can also be attributed to the universal group. They have a very pointed tip. Models are considered the most suitable option for attaching a metal frame to a wooden crate. They can also be taken to attach profiles to each other.

Round head self-tapping screws

These types of fasteners can be used to attach metal profiles, mainly those made of aluminum or soft alloys with aluminum. There is a small cross-shaped slot on the head, such an element makes it possible to use self-tapping screws for powerful screwdrivers. The central rod of the product has a tight single-start thread.

Also, self-tapping screws with a sharp tip can be classified depending on what material they can be used for.

By wood

Fasteners for wood, lining have rare threads in the form of thin screws. Wooden products are considered softer and more pliable to processing, so they do not require too sharp self-tapping screws. Fasteners can be inserted into surfaces without preliminary drilling, but self-tapping screws with a drill can significantly speed up this process and make it simpler.

Furniture screws

Such options allow you to fasten chipboard and MDF boards, from which furniture structures are mainly made.The fixing elements have a traditional length of 50 millimeters. Their hat is hexagonal.

Roofing types

Such self-tapping screws with a drill have a hexagon head and a special rubber washer-gasket. The last element plays an important role, since it is thanks to it that sufficient insulation from a large amount of moisture is ensured, and it also acts as a shock-absorbing seal for the joints.

Vandal-proof varieties

These special tipped self-tapping screws have a cap with special grooves. They can have a star-shaped, multifaceted shape.

Self-tapping screws with drills also differ from each other in the type of thread.

• Coarse thread. As a rule, it runs along the entire length of the metal rod and has a rare pitch. The model will be suitable for working with soft materials, including different types of wood, plaster and plastic.
• Average. This thread is found in universal types of self-tapping screws. Almost all materials can be recorded with such models.
• Frequent double-start threads. This type is suitable for working with thin metal sheets. There is a thin, sharp tip at the end of the rod.
• Asymmetric thread. It is often used in production, in domestic conditions it can be taken for the assembly of furniture structures.
• Variable serrated thread. This type is used in cases when you need to attach products to a brick or concrete surface without using dowels.

Confirmat - furniture screw

Unlike the traditional sharp self-tapping screw, in this type of SFS the main feature is the blunt end. On furniture hardware, there is a countersunk head with a cross recess, as well as a rare threaded notch. They are used for assembling furniture, fixing chipboard, MDF, plywood and other wooden surfaces, regardless of the weight of the element.

Roofing screws

Roofing tools are always more complex in design. Roofing screws are no exception. This is a combination of a screw and a traditional self-tapping screw: a round head with a slot for a screwdriver or a hexagonal recessed head and a sharp tip.

Length - up to 150 mm, diameter - up to 6.3 mm. Manufactured from high carbon stainless steel. They are used for fastening all types of roofing materials, regardless of weight and purpose.

With rare carvings

Self-tapping screws with rare threads are ideal for working with wooden canvases. The most popular dimensions are in diameter x 35 mm, and in length - depending on the thickness of the surfaces to be fastened.

Peculiarities

Self-tapping screws of this type are used not only in everyday life, but also in production. Since the metal has a rigid structure, only this category of hardware can handle it. These fasteners have a low cost and are sold in kilograms or per piece. There are usually few parts to complete a task, so purchases are often made by weight.

The main characteristics of the products are:

• low cost;
• no difficulties in the installation process;
• wear resistance;
• good quality and long period of use;
• resistance to negative environmental factors.

The bolt for fastening metal structures consists of several parts.

1. The rod is the main part of the self-tapping screw, which has a significant length and different pitch.
2. Head. According to the specifics of the application, this hardware can have a head for a hex wrench or for a Phillips-type screwdriver.
3. Washer or gasket that seals the hole. Most manufacturers sell self-tapping screws with a rubber gasket. However, they are not durable and reliable enough. The washer must have a convex shape, which contributes to increased tightness during installation.
4. Tip. This part of the product is characterized by its tightness and drill-like shape.

Compliance with these standards allows the use of products when joining surfaces inside and outside the premises.

Size charts

Below are the dimensions of the most common self-tapping screws.

Sizes of black wood screws

The length of the hardware is standardized and can be: 16; 19; 25; 35; 41; 45; 51; 55; 64; 70; 76; 89; 95; 102; 127; 152 mm.

Sizes of yellow wood screws

Length of yellow self-tapping screws

Dimensions of self-tapping screws with a press washer

Dimensions of self-tapping screws with a hex head

Sizes of roofing screws

In the wholesale purchase of fasteners, in addition to their design features, the weight of the hardware is also important.

What is the purpose

A furniture screw is a special fastener, the main purpose of which is to connect parts made of wood materials by screwing in and creating a thread inside the product. It is used in the assembly of furniture structures, joinery and building products, since such fastening has a positive effect on the quality of furniture, its service life, and aesthetics.

It is used for such building materials that are used in the production of cabinet furniture, such as:

• massive wooden sheets;
• chipboard;
• fibreboard;
• Chipboard;
• plywood;
• thin drywall.

Externally, a furniture screw is a rod made of metal and decorated with:

• a head of a certain shape, which is part of the fastener, and also serves to transmit torque;
• slot - a recess of a certain shape at the end of the head of the hardware;
• massive, widely protruding above the main rod, thread, the lower turns of which are conical and have notches;
• sharp tip.

Thanks to the large threaded and shank surface, the stress on the parts being twisted is minimized. As a result, the assembled structure becomes resistant to any impact. Also, the screws are in close contact with the material to be fastened due to the same diameter of the smooth and rod parts of the hardware.

In the production of furniture screws, high-quality high-strength carbon steel is used, which, due to its chemical composition and heat treatment, has the necessary complex of mechanical characteristics. This allows you to effortlessly get the hardware out of the material in case of improper installation. To increase the anti-corrosion properties, the screws are treated with a special compound based on nickel, zinc, brass.

A furniture screw has advantages and disadvantages. Positive characteristics include:

• reliable and stable fixation;
• the easiest installation possible;
• the ability to withstand heavy fracture loads;
• the ability to connect structural elements one after another;
• tight tightening of furniture parts;
• does not require special skills, complex assistive devices.

In addition to the advantages, it is necessary to identify the disadvantages of screws for furniture:

• the need to mask products by means of a plastic plug in the color of the material;
• the elements connected with hardware cannot be disassembled, since the structure will not withstand repeated assembly.

The furniture screw is responsible for fastening the parts of the furniture body together, fastening the shelves, connecting the sections. Reliability of the connection, safety, the ability to easily disassemble and assemble furniture without prejudice to it if it is necessary to move depends on it.

Drilling holes for self-tapping screws

There are often cases when, before fastening to a self-tapping screw, it is necessary to drill the materials to be fastened (go through the attachment point with a drill). This should be done for thick and thin materials. For example, if you try to twist a self-tapping screw into dense oak wood without preliminary drilling, the self-tapping screw will simply break off, bend or significantly under-screw to the end, and the connection density will be absent (a gap will appear between the connected elements).

When attaching thin parts, pre-drilling is necessary in order to avoid cracks and splits in the thin attached material.

You can select the diameter of the required drill for drilling under one or another self-tapping screw according to this table:

If the diameters of the drill and the self-tapping screw are equal, the adhesion density will be very low or there will be none at all.

Tighten the black self-tapping screws using a PH2 screwdriver or similar bat. For golden screws - PZ bit No. 1, No. 2 or No. 3, depending on the diameter of the self-tapping screw.

How and with what screws are fixed

Correctly selected self-tapping screw is the ideal fastening element

Among the variations of tools with which self-tapping screws perfectly "contact", the first place is taken, of course, by the screwdriver.

Many types of self-tapping screws can be screwed in with a regular Phillips screwdriver

In this case, it is better not to make extra efforts, but to screw it in smoothly and carefully. Remember, oxidized self-tapping screws are very fragile.

Safety when working with the tool

Let's consider a short set of rules for working with the tool:

Illustration
Description of action

When working with a screwdriver, never put your hand under the tool. Even if you feel like you are in control, a slight tilt, the tool may slip and you may be injured.

Never try to drill a self-tapping screw into a knot. Such areas are often the most dense. In addition, the mount will not be durable.

It is better to choose a place slightly to the left or slightly to the right.

Always keep the tool firmly in line with the self-tapping screw, whether at an angle or not. In relation to each other, they must create a single line.

Species overview

Many are faced with this type of fastener for the first time and simply do not know how the wood screws differ among themselves. It is difficult for an inexperienced person to immediately navigate such a wide selection of varieties.

It is customary to classify product data according to several criteria.

Outside surface treatment

From what material the self-tapping screw will be made, its further strength depends. It can be stainless steel, carbon steel, brass. To protect it from corrosion, it is coated with a special solution.

If the self-tapping screw has a black color, then this is the so-called phosphated self-tapping screw. Used in places with low moisture levels, extremely unstable to corrosion.

Self-tapping screws covered with brass are yellow and are recommended for use in buildings with high humidity.

The silver color is found in hardware covered with a chromium film. This coating prevents the development of corrosion, protects against abrasions and scratches.

They are considered decorative, used wherever it is important not to disturb the aesthetic appearance of the room.

By form

Manufacturers offer the widest range of self-tapping screws.Under different operating conditions, fasteners of a certain shape are used, some of them have special options, for example, rubber gaskets or a surface in the form of a drill.

Some of the best are structural screws. In fact, they are almost universal for woodworking, as they are suitable for various types of wood. They are made of strong and ductile steel, which allows them to be used in any bend (that is, at whatever angle it is screwed in, it will be very difficult to break it). A structural self-tapping screw is usually used when joining massive structures.

By thread type

Main varieties:

• self-tapping screw with a wide thread pitch, used for soft wood (MDF, chipboard, fiberboard), such fasteners are also used when joining drywall, plastic;
• small pitch (low thread) is suitable for mounting dense wood, hard plastic and even metal parts;
• The two-start thread (it alternates between a small and wide pitch) is ideal for joining materials that differ from each other in their density, for example, gypsum fiber and metal profiles.

The choice of the length of the screws

There are several rules for choosing the length of a self-tapping screw that apply in different situations. When joining / joining two not very massive parts, the following selection rules work:

• So that you do not connect, the sharp end of the self-tapping screw should not stick out from the other side of the parts to be connected. That is, in any case, it should be shorter than the parts to be joined. Moreover, it is believed that the maximum strength will be if at least 5-6 mm remains to the edge of the lower part. So count it.

  The length of the self-tapping screw is selected depending on the parts to be fastened

• On the other hand, the minimum self-tapping screw should fit into the lower part by at least 1/3 of the thickness of the part to be attached. That is, if you fasten, say, a beam of 100 * 100 mm, then the minimum length of the self-tapping screw should be 1/3 longer. For this timber, the minimum screw length is 100 + 100/3 = 133 mm. Take the nearest larger. If you fasten a board 28 mm thick, then the minimum length of the self-tapping screw is 28 + 28/3 = 37 mm (usually 42 mm is chosen).

If a thin piece is attached to a massive base, another rule works. Then the length of the fastener should be 2-2.5 times longer than the attached part. So it is necessary to select the length of the self-tapping screw if you attach something to a wall, say, or to a concrete floor. In this case, in order to fix the same 28 mm board to the wall, the length of the fastener is 56-70 mm. This is the difference.

Self-tapping screw sizes: the most applicable options

How choose the length of the screws, it should be clear. Now about what they are in general. The situation here is confusing. Neither screws nor self-tapping screws have a common standard. There are several standards of "worn out" years of release, in which the sizes of some types of self-tapping screws are prescribed.

• GOST 1145-80. Countersunk self-tapping screws.
• GOST 1144-80. Pan head screws.
• GOST 1146-80. Half-countersunk head screws.

The situation today is that each manufacturer produces its own "line". They are oriented, of course, on demand. Well, the parameters of the heads are usually made in accordance with one or another GOST. This will somehow stabilize the situation. Sometimes the assortment - diameters and lengths are also made according to the standard. In this case, in the description of self-tapping screws, the diameters in which they are generally produced are indicated, and then there is a postscript: it corresponds to such and such a GOST. This means that the heads comply with the specified standard, as well as that the assortment corresponds.

How, then, are self-tapping screws chosen in terms of length and diameter? Calculate / determine the length that is needed, are determined with the type of head. Then they look at the diameters and make the final choice. Let's say right away that the principle “thicker is better” does not work for wood. This can be applied to metal. For wood, thinner ones are better, but with good carvings and made of good metal. This is ideal.

If the manufacturer has his own parameters of self-tapping screws, they are indicated in the description

But this is not enough. The store usually offers up to a dozen options of the same size, but from different manufacturers. And if it is more or less easy to decide on the metal and the type of processing, then it is difficult to choose which brand to take. There are, of course, proven ones, but they are expensive. Although, if we take the cheap ones, 30-50% can go to marriage. What kind of marriage? Now they bend, then the hats fly off. It is not always, but often. If you are "lucky" to run into such fasteners, it turns out that buying "expensive" ones would not be more expensive. Well, or not much more.

Now compare the two tables. They are compiled according to different GOSTs. As you can see, the diameters and lengths are the same. This makes life easier. If, in the production of fasteners, the standard was adhered to in terms of the diameter / length ratio, then everything is simple. If not, then the manufacturer in the description of the screws attaches a table with dimensions (as in the picture above).

What are they?

As with any fastener, the dimensions of a self-tapping screw are their diameter and length. In order to prevent the buyer from purchasing different products for the same marking when buying in different stores, all self-tapping screws must comply with certain dimensional standards. For European manufacturers, these are:

• DIN - German standard;
• ISO is an international standard;
• GOST is a domestic standard.

In many ways, these three standards coincide, although they have their own nuances. The manufacturer in the description of the goods is obliged to indicate the characteristics in accordance with one of them. And in order to make it easier to standardize self-tapping screws by standard size, they are divided into several types.

By wood

The main difference between such self-tapping screws is a rather large thread pitch. This is explained by the low density and hardness of wood, which makes it possible to produce thinner and longer hardware (from the words "metal products"). Their length ranges from 11 to 200 mm, and their diameter ranges from 2.5 to 6 mm. The harder the wood, the larger the size of the fastener has to be selected. Most often, self-tapping screws for woodwork are called universal. For home repairs, the cheapest self-tapping screws with plastic dowels are enough to fix baseboards, socket boxes or hang a shelf on the wall.

In cases where the material is too dense, a hole is drilled before fastening to the self-tapping screw. In order not to spoil the structure, you should carefully select the drill diameter. This can be done using a small table.

For metal

Self-tapping screws for working with metal are somewhat different from those intended for wooden structures. Their length ranges from only 9.5 to 75 mm, and the diameter starts from 3.5 mm and ends already at 4.2 mm.

With press washer

Such elements can be called universal, because they are used to fasten wood, metal, plastic, siding and many other materials. Their distinctive feature is a large cap, which is called a press washer. With its help, it turns out to press the fastened structure more tightly, without using additional washers. Their length is from 13 to 64 mm, and their diameter is always 4.2 mm.

Roofing

The self-tapping screws, which fasten the profiled sheet strips, metal tiles and other types of roofing, have a length of 19 to 100 mm, and the diameter of the rod - from 4.8 to 6.3 mm

Instead of a regular cap, they have a large washer with a rubber gasket, which does not allow water to pass through, which is very important when installing a roof. However, they are often used for fastening other structures, for example, a fence made of a corrugated sheet or a metal garage door frame.

Furniture

Such self-tapping screws are called "confirmations", they are used when assembling various furniture. Their length is from 40 to 70 mm, and their diameter is from 4.72 to 6.05 mm.Such self-tapping screws always require preliminary drilling of the marked holes with a special confirmation drill; screw them with a special hexagon, and not with an ordinary screwdriver.

"Capercaillie"

Such fasteners are used for the installation of heavy structures, where high strength and reliability are especially needed, for example, in the construction of interfloor floors. Their length is usually 40 mm, and the diameter starts at 6 and ends at 10 mm. The hexagonal head is tightened with an ordinary wrench or a special attachment for a screwdriver.