How to screw a self-tapping screw into aluminum

Metal screws: types and applications

The main difference between self-tapping screws for metal is the frequent low thread, which enhances adhesion to a dense solid base. Self-tapping screws for wood and other soft materials, on the contrary, have a high thread ridge with a wide pitch. Self-tapping screws for fastening materials of different densities, for example, gypsum fiber and metal profiles, are produced with double-start threads - alternating high and low turns.

Another fundamental difference between self-tapping screws for metal is the greater thickness of the body and high surface hardness, which protects the product from deformation when screwed into metal.

Main types of screws for metal

Frequently low threads and body thickness are probably the only characteristics that metal screws have in common, since other features may vary.

Self-tapping screws for metal vary

by type of head (hexagonal, rounded, countersunk, trapezoidal heads, with press washers or EPDM gaskets);
by type of spline (Torx, Ph, Pz, anti-vandal splines);
by type of tip (pointed and with a drill);
by type of coating (galvanized and phosphated);
by material (stainless and ordinary carbon steel);
by scope of application (for interior and exterior work);
according to the standard (GOST, DIN, ISO, non-standardized).
Let's look at the most common types of metal screws and the features of their use.

1. Self-tapping screws with a press washer

Self-tapping screws with a press washer vary greatly in quality.

High-quality products can be distinguished by a trapezoidal head with a wide collar. The voluminous head presses the material tightly, and the deep cross-shaped slot prevents the bit from jumping off. These hardware are made from carbon steel with a 5 micron zinc coating.

Diameter – 4.2 mm. They come in two types: pointed and drilled. Pointed screws can be used to fasten metal sheets up to 0.9 mm thick without drilling; self-tapping screws with a drill “take” sheets up to 5 mm. These products are suitable for professional installation (interior work).

There are also cheap options for self-tapping screws with a press washer. These are the so-called “bugs” or “seeds” with which all hardware stores are flooded. Their feature is an almost flat rounded head. Such self-tapping screws are often used in everyday life, including as universal ones, but they are not intended for professional work.

The fact is that cheap self-tapping screws with a flange are coated with a thin layer of zinc (3 microns), so they rust easily; a bit or screwdriver often pops out of a shallow slot, which can lead to chips and scratches on the material and the slot breaking off.

In addition, among such products there are often defective ones - with a displaced center, with a filled head that immediately rolls up, “plasticine” screws without heat treatment and other defects.

2. Self-tapping screws for metal profiles

A self-tapping screw for metal profiles is a product with a sharp end or a drill and a full thread. The head of the product has the shape of a truncated cone with a cross-shaped slot.

The head may have locking notches that stop the self-tapping screw when tightening and prevent spontaneous unscrewing. Diameter – 3.5 mm.

Self-tapping screws are made of galvanized or phosphated steel and are designed for fastening sheet metal to metal profiles. The variety with a sharp end drills out metal up to 0.9 mm thick, with a drill – up to 2 mm.

3. Flugel self-tapping screw for fastening wood to metal

A self-tapping screw with a Flugel drill is necessary for attaching wood, plywood and chipboard to metal profiles and sheets without pre-drilling holes.

A special feature of this self-tapping screw are two protrusions at the end of the product, which break off when entering the metal after drilling into the wood. The drill makes a hole in the metal, and the cutting ribs countersink a hole in the wood for a countersunk head.

The Flugel self-tapping screw design allows drilling, screwing, countersinking and tightening of the structure in one go. This self-tapping screw is made from galvanized or stainless steel.

4. Roofing screws with EPDM gasket

This type of self-tapping screws is intended for external work - fastening roofing materials to metal structures and wooden sheathing. The product is equipped with a sealing washer made of EPDM (ethylene propylene diene rubber), which, when screwed in, compresses and seals the hole.

The hex head with flange can be coated with paint to protect against corrosion and match the color of the material being attached. It presses the washer during installation.

Self-tapping screws with a sharp end are intended for fastening a soft roof to a wooden base, with a reduced drill - for installing corrugated sheets to a wooden sheathing, with an enlarged drill - for fixing corrugated sheets to a metal base (the size of the drill is selected based on the thickness of the base).

5. Black self-tapping screws for attaching drywall to metal

Phosphated self-tapping screws are used for attaching plasterboard boards to a metal profile. They look almost the same as black self-tapping screws for installing drywall to wood, but differ from them in a finer thread pitch.

Drywall-to-metal self-tapping screws have a countersunk horn-shaped head with a cross slot, full threads and two types of tips: sharp or drill. Black self-tapping screws are used mainly for finishing premises.

The pointed version does not require preliminary drilling of holes in metal up to 0.9 mm thick, the version with a drill – up to 2-3 mm.

6. Self-tapping screws DIN 7981, DIN 7982

Self-tapping screws according to DIN 7981 and DIN 7982 are used to fasten thin sheet metal, having previously drilled it out. Self-tapping screws DIN 7981 have a hemispherical head, full thread and a Phillips slot or a sprocket drive (Torx). Products of the “C” shape have a sharp tip, while the “F” shapes have a blunt tip. Self-tapping screws with a blunt end are also used for working with plastic (with hole preparation).

Self-tapping screws DIN 7982 are exactly the same, the only difference is the countersunk head for which the hole is countersunk during installation. Made from galvanized or stainless austenitic steel A2 and A4. These products are often found in mechanical and instrument making. They are analogues of GOST 10621-80 and ISO 7049.

7. Bimetallic screws

Bimetallic screws are made of two metals, for example, soft stainless steel and harder carbon steel (drill and first threads). There may be a combination of stainless steels A2 and A4.

Bimetallic screws are used to connect profiled sheets and sandwich elements in lightweight structures. They can be used in steel-to-steel, aluminum-to-aluminium, steel-to-aluminum, wood-to-steel and wood-to-aluminum joints.

The products are resistant to weather conditions, as they are equipped with a sealing washer made of steel with a vulcanized EPDM gasket, which protects the mounting location from moisture. The hexagonal drive serves for optimal power transmission. In addition, when screwing in bimetallic screws, virtually no drilling chips remain.

8. Stainless steel screws

Stainless steel self-tapping screws are similar in appearance and function to bimetallic ones, but are entirely made of A2 or A4 austenitic steel. Can be produced with copper coating. Hardware is necessary for external installation or assembly of structures in wet areas. They use sheet metal sheathing.

Conclusion

Of course, there are other types of metal screws. However, whatever type of screws you choose, buy them only from trusted manufacturers to avoid unpleasant surprises. If you buy hardware from a store, ask for quality certificates. Well, the best option is to purchase fasteners from TsKI, since we carry products only from reliable suppliers and test each item in the laboratory.

Write to us and share your practical experience on using self-tapping screws for metal!

Source: https://www.cki-com.ru/blog/metal-screws/

How to screw a screw into chipboard?

The modern market for construction fasteners offers the buyer a wide selection of self-tapping screws - so necessary for any repair of products. However, reviews of these “little helpers” are not always flattering.

The thing is that home craftsmen often do not know how to screw in a self-tapping screw correctly and how to choose it correctly.

Types of self-tapping screws

There are two main types of self-tapping screws used for self-repair - for wood and universal. Their main difference is in the thread pitch - “screws” for wood are characterized by a large pitch (more rare application of thread turns).

There is a misconception that universal parts are just as good for wood, plywood and chipboard as specialized ones. No, of course, it won’t be difficult to screw them into these materials, but how well they will stay there is a big question. The fact is that the “raw material” into which the self-tapping screw is “immersed” must lie securely in the grooves of the thread, and the structure of the wood will not allow it to fit well into the narrow “grooves” of the universal self-tapping screw.

Tools for tightening screws

Fasteners can have heads of different sizes and recesses in them of different shapes and sizes. Therefore, before screwing in a self-tapping screw, make sure that you have a screwdriver or screwdriver with a suitable attachment in your arsenal. In general, it is better to have, as they say, as many attachments for the corresponding tools as possible. Plus, they should be replaced regularly, since wear of the devices during operation cannot be avoided.

Note! The best attachments are those made of tool steel with hardening additives. Do not choose the first set you come across, otherwise after a couple of days of intensive work you will have to go for a new one.

If your plans are to screw one or two screws into a non-solid surface, then you can use a screwdriver. If it’s more, you can’t do without a screwdriver. Tightening fasteners with a screwdriver is not as simple an operation as it might seem at first glance, and requires some skill. A screwdriver will do everything quickly and efficiently.

General technology for screwing in self-tapping screws

Using an awl, make a small indentation in the space reserved for the screw. Place the product “in position”. Using careful but confident movements, rotate the part until it is well deepened and secured in the material. After this, the force can be increased. Towards the end of the “process” the speed must be reduced again so as not to damage the screw.

How to screw self-tapping screws into different materials?

Many men, not knowing how to screw a self-tapping screw into concrete, spoil a sufficient number of purchased parts. In fact, everything is quite simple: self-tapping screws are “integrated” into concrete using dowels - durable plastic “tubes”. First, a hole is made in the material, a dowel is installed there, which “accepts” the fastener.

Worth knowing! Craftsmen advise lubricating the dowels with glue before installation. This, in their opinion, strengthens the connections.

Drilling holes in concrete should be done exclusively with a hammer drill - even an impact drill may not hold up, let alone a regular one. Self-tapping screws are suitable for both wood and universal ones.

Brick, ceramic tiles, screed

Self-tapping screws are screwed into these media in the same way as into concrete. The only thing is that when working with tiles, it is better to take a regular drill, since it can crack due to the excessive power of the hammer drill.

Copper, bronze, aluminum

Measure the diameter of the fastener shank excluding threads. This manipulation must be performed with a caliper. Place the pointed jaws perpendicular to the screw and clamp the product so that they completely penetrate the thread groove; determine the diameter. Using a drill with a diameter a millimeter and a half smaller than the obtained value, make a hole in the material. Screw the screw into the hole and the job is done. Use parts with universal threads.

Note! Before “making a hole” in the main structure, it is recommended to test the drill on a small unnecessary piece of similar material. Drill a hole and try to screw the product into it.

The drill is considered correctly selected if the self-tapping screw fits into the hole tightly enough, but does not jam. If the screw fails to “break through”, you should work with a thicker drill.

Tightening the part too easily symbolizes that you need to take a thinner drill - otherwise the self-tapping screw may pop out at any moment.

The hole in the material should be equal to or slightly larger than the diameter of the unthreaded rod. Self-tapping screws will not be able to cope with a number of hard metals - in particular, screwing these fasteners into cast iron is almost impossible.

Not every plastic material is ready to accept a self-tapping screw, so making sure before starting work that the material fits exactly is a good idea. The technology for screwing a self-tapping screw into plastic is the same as for soft metals - copper, aluminum, bronze. Recommended products - with wood carvings.

Wood, fiberboard and chipboard

Don't know how to screw a self-tapping screw into a board? Believe me, nothing is simpler. The basic rule is to use only wood screws. For hard wood, thin boards, chipboard, fiberboard, pre-drilling a hole for the product is mandatory, since there is a risk of the material splitting with a self-tapping screw. For thick boards made of soft wood, you can do without this manipulation.

If you are working:

with hardwood - choose a drill with a diameter equal to the diameter of the self-tapping screw rod (without threads, of course);
with fiberboard – 1 millimeter less;
with chipboard or soft wood - 2-3 millimeters less.

Mark dots on the sheet with a pencil. The optimal pitch between screws is up to 70 centimeters, depending on the expected loads on the structure. If you are using a screwdriver, you can start screwing the product in at maximum speed. After the self-tapping screw enters the surface by ½, it is recommended to gradually reduce the speed to minimum.

When tightening with a regular screwdriver, all movements should be smooth. It is very important to tighten the self-tapping screw correctly - ideally it should be 1 millimeter below the level of the cardboard, not the plaster! This will ensure maximum strength of the future structure.

If you suddenly did not follow the technology and broke through the cardboard, the “ill-fated” place needs to be puttied, and a new fastener should be placed at a distance of 5-9 centimeters from it.

The type of self-tapping screws for drywall should be selected depending on the material used to construct the sheathing. For a metal frame, universal or metal screws are required, for wooden sheathing - wood products.

How to properly tighten a screw that has been removed?

The unscrewed part must be re-tightened exactly as it was before. It is very important that the screw fits into the same groove, at the same angle. If the product “draws” a “new path” for itself, the reliability of fastening will be significantly reduced.

How to get into an existing recess? Simply insert the part into the hole and turn it by hand without pressure. As soon as everything falls into place, you will feel it - the process will go like clockwork. There is no need to put pressure on a tight screw; you just need to remove it and try again.

A little force is required only at the very end of screwing.

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Now you know how to screw a self-tapping screw into drywall, concrete, brick, wood and metals correctly and what to do in case of “working hiccups”.

Source: https://agrostroy2.ru/dsp/kak-vkrutit-shurup-v-dsp.html

How to tighten self-tapping screws with a screwdriver

The thing is that home craftsmen often do not know how to screw in a self-tapping screw correctly and how to choose it correctly.

How to screw a self-tapping screw into wood

There are three ways to screw a self-tapping screw into wood: a screwdriver, a screwdriver or a drill. The easiest and almost cost-free way to tighten a self-tapping screw is with a screwdriver.

Wood material is soft and pliable, which allows you to screw a sufficient number of screws into it with a screwdriver without much fatigue. In order to tighten a large number of screws, you will have to resort to using a screwdriver; it will do all the power part of the work for you.

Screwing a self-tapping screw into wood with a drill is also not difficult, but for this, the drill must have a function for smoothly adjusting the rotation speed.

How to screw a self-tapping screw into wood with a screwdriver

In most cases, you have to screw self-tapping screws into wood with two types of slots, flat and cross-shaped. To tighten such screws, select the appropriate screwdrivers with a flat (marked SL) or cross-shaped (marked PH) tip. You can also find cross-shaped bits marked PZ on sale.

PZ bits have additional edges and are used for self-tapping screws with a recessed slot. Sometimes flat-head screwdrivers are called minus-head screwdrivers, while those with a Phillips-head tip are called plus-head or figure-head screwdrivers.

In addition to the letter index, their marking also contains digital indexing, which indicates the width of the flat tip or the group to which the cross-shaped tip belongs. When making furniture with your own hands, you most often have to use a screwdriver to tighten self-tapping screws whose diameter ranges from 2.2 to 4.2 millimeters.

Therefore, for screwing flat-head screws into wood, the screwdriver designation must be SL from 4 to 8, and for screwing cross-slot screws into wood, the screwdriver designation must be PH or PZ 1 or 2.

Read more: The spray foam gun passes through the nozzle

How to screw a self-tapping screw into wood with a screwdriver

Even a person who is far from this business can handle screwing a self-tapping screw into wood with a screwdriver, since the screwdriver will do all the work for you, you just need to choose the right attachment for the screwdriver (bit). The rules that must be followed when choosing a bit for screwing screws into wood are the same as when choosing a screwdriver.

How to screw a self-tapping screw into wood with a drill

To screw screws into wood, the drill must have an electronic speed control function. In other words, the rotation speed of the drill chuck should gradually increase as you press the button.

It is also worth remembering that most drills do not have a maximum force adjustment function like a screwdriver, and therefore you need to independently control the depth of screw tightening and remove your finger from the button in time.

A regular drill has enough force to drive a screw deep into wood or even tear off the head of the screw.

How to tighten a self-tapping screw without a screwdriver or a screwdriver

This method of tightening self-tapping screws is, of course, an exception to the rule, but in some cases when it is really necessary and only a drill and self-tapping screws are at hand, there is nothing else left to do but clamp the head of the self-tapping screw directly into the chuck and slowly tighten it. To prevent the screw from spinning in the chuck, you can hit the edge of the screw head with a hammer several times so that it becomes slightly deformed rather than round.

What drill to use to drill a self-tapping screw into wood?

There is no need to pre-drill the hole, since a self-tapping screw is nothing more than a self-tapping screw, and according to the manufacturer’s specifications, it is screwed into wood and plastic without drilling.

To confirm this, you can think about what a drill should be like for drilling a self-tapping screw into wood 4.8*100, and if you think logically, the diameter of the drill should be approximately 3 mm. and the length is at least 130 mm.

(Drill 100 and clamp 30 into the drill chuck). It is unlikely that such a drill can be found on sale.

And finally, remember that a poorly driven screw holds much better than a well-tightened nail.

It would seem that there could be something new in such a simple task as tightening self-tapping screws, but there are many nuances and subtleties here that will allow you to do this faster, with better quality and without ruining the tool

Let's begin without much preamble.

Cross PZ and PH

Source: https://moy-instrument.ru/instrumenty/kak-zakruchivat-samorezy-shurupovertom.html

How to screw in a self-tapping screw

It is impossible to do without fastening elements in construction today. They allow you to connect different building materials, hang objects, strengthen certain structures, etc. One of the most common fasteners is a self-tapping screw.

This product has a male thread and a head. The thread is relatively sharp, so in some materials it can cut internal threads on its own. This article will talk about how to screw a self-tapping screw into a variety of materials.

But first, let's look at the classification of these products.

Classification

This fastener is made from different materials such as brass, stainless steel and carbon steel. Also, self-tapping screws have different coatings, such as:

galvanized (available in yellow);
oxidized black;
phosphated black;
without cover.

Differ by head type:

semi-cylindrical;
secret;
hexagonal;
hemispherical.

Black screws

The use of one or another self-tapping screw depends on the density of the material that you plan to attach. Therefore, before purchasing this product, you need to decide on the following:

Connection operating conditions.
Is it necessary to drill a hole before screwing?
What material should it be screwed into?
What material will be attached.

Based on this, you make the appropriate choice, whether it will be a self-tapping screw for metal, wood or concrete.

On wood

The main difference between self-tapping screws for wood is the rare thread, unlike their counterparts intended for metal. Such fasteners can be black, gold and white. So, if it is necessary to screw a golden hinge on a door, then a golden self-tapping screw is selected accordingly. In most cases, the choice falls on a black self-tapping screw.

For metal

As already mentioned, the thread on such a self-tapping screw has a frequent pitch. This is due to the fact that metal is a fairly hard material, so the adhesion must be made strong. Moreover, some metals should not be pre-drilled, such as tin. For thicker metals, you will need to make a hole.

Roofing

Such self-tapping screws are used for fastening roofing sheet material. It must be equipped with a rubber seal. As a result, the connection, in addition to strength, becomes airtight.

Furniture or confirmation

This type of self-tapping screw requires pre-drilling a hole in the furniture piece. A hex wrench is used to tighten it.

These are perhaps the most common types of self-tapping screws that are used in various fields of construction. Let's look at the details of how to screw this or that self-tapping screw into different surfaces.

Into drywall

When finishing the ceiling and walls, plasterboard is often used. And given that this material is relatively fragile, it is important to be careful when screwing a screw into it. So, to screw a self-tapping screw into drywall, you will need a screwdriver with an attachment or a Phillips screwdriver.

Mounting diagram

Much depends on the purpose for which the self-tapping screw will be screwed into the drywall. For example, if you need to hang a small object, you must first insert a special dowel, which, when screwed in, forms a reliable fastening. If you need to screw a self-tapping screw directly into drywall, for example, attaching it to a profile, then the technology is as follows:

Make markings on the drywall. Depending on the possible load, the step between fasteners can be from 20 to 70 cm.
Next, put the self-tapping screw on a screwdriver or screwdriver attachment and place it on the point.
Then you start screwing it in. If you use a screwdriver, you should not turn on high speeds. Otherwise, there is a risk of turning the screw and it will not hold anything. This also applies to doing work with a screwdriver. Don't put pressure on her. The self-tapping screw has a thread that will allow you to screw it into drywall without much effort.
It is very important to tighten the screw so as not to break through the top layer of cardboard. For example, if you attach gypsum board to a profile, then with great effort the self-tapping screw may simply fall into the cardboard. So, the head of the screw should lightly press the top layer of cardboard. But don’t leave it untwisted. Otherwise, you will have difficulties when puttingtying.

The diagram shows correct and incorrect twisting:

Scheme of correct and incorrect screwing in of a self-tapping screw

After tightening, the head of the fastener should be 1 mm below the general surface level. This will ensure sufficient tension.

What to do if you were unable to successfully tighten the self-tapping screw and it broke through the cardboard? In this case, unscrew it back, fill the hole, and screw in a new screw at a distance of 50–80 mm.

As for the type of self-tapping screw, its choice depends on the material used for the sheathing, whether it is wood or metal. As for the length, it is enough for it to fit into the profile up to 10 mm.

Choosing a self-tapping screw for fastening drywall

Into metal

As for screwing the self-tapping screw into metal, only metal fasteners are used here. The twisting method depends on the thickness of the workpiece. If it is thin sheet metal, then you can often tighten it without much effort using a screwdriver or screwdriver. Moreover, there are different types of screws. Some have a small drill with sharpened teeth on the tip, as shown in the picture.

Self-tapping screw with drill with sharpened teeth

But as practice shows, not all such screws can be screwed into metal, this is explained by the weak sharpening of the drill. So, a screwdriver is used to tighten them. You should not gain high speed, otherwise the screw may overheat and quickly become dull. Such fasteners can be used for metal up to 7 mm thick.

If the metal is too thick, then the best option would be to pre-drill a hole with a drill/drill, and then screw the fasteners into it. This method is not associated with any problems.

When making a hole, remember that its diameter should be smaller than that of a self-tapping screw. When the hole is ready, it can be lubricated with machine oil. This will allow you to tighten the screw without much difficulty.

The metal screw used should be made of solid steel, which is harder than the product.

Into the tree

As for wood, everything is very simple. The only restrictions may be imposed by the type of wood used. If it is soft, then there is no need to pre-drill a hole. If the workpiece is made of chipboard or fiberboard, then it is better to drill a hole. Moreover, it is recommended to drill a hole in cases where it is necessary to tighten a long screw on wood. This even applies to soft wood.

When making a hole, its diameter should be smaller than that of a self-tapping screw. This will ensure reliable fastening of the workpieces.

In addition, the hole should also be made in cases where the wood piece is relatively thin and there is a risk of splitting it. When screwing a self-tapping screw into such parts, you need to be careful.

When twisted, the cap should be recessed into the wood. If this is a finished floor, then all holes must be covered with wood putty.

Into concrete

If we talk about concrete, then it is, of course, a hard material and to screw a self-tapping screw into it you cannot do without an impact drill or hammer drill. It is worth noting that in this case, for tightening, the self-tapping screw can be combined with a plastic plug from the dowel. The work of screwing a self-tapping screw into concrete looks like this:

Drill a hole to the required depth in the wall. The diameter of the hole must match the diameter of the plastic plug.
Next, remove dust from the hole.
Then insert a plastic plug into it.
Finally, use a screwdriver or screwdriver to tighten the self-tapping screw.

If the walls are plastered, then you can try to tighten the screw without making a hole. You will definitely be able to do this if the plaster is not too hard, especially if it is clay-based. In this case, you will need a wood screw with a rare pitch of turns.

So, we looked at the technology of how to correctly screw a self-tapping screw into different materials. If you know about other methods, be sure to write to us about it in the comments to this article.

You can visually familiarize yourself with the method of screwing a self-tapping screw into metal from our video:

This video shows an original method of how to tighten a self-tapping screw without a tool:

Source: https://kakpravilnosdelat.ru/kak-vkrutit-samorez/

Fastening polycarbonate with self-tapping screws. How to choose screws and how to fasten them correctly

Polycarbonate sheet is a universal and practical material that is widely used in construction. Roofs, canopies, canopies and greenhouses made from it are durable and visually attractive, durable and resistant to negative weather factors. Polycarbonate boards filter harmful UV radiation, which makes canopies based on them the best option for greenhouses, gazebos and terraces.

But to be confident in the quality and long service life of the constructed structure, you need to know the basic rules for its installation. In particular, understand which screws to use to attach thermal washers to cellular polycarbonate and how exactly to do it.

What self-tapping screws to fasten polycarbonate

When fastening polycarbonate with self-tapping screws, it is important to understand that this material can easily be damaged if handled incorrectly. Therefore, it is important to pay attention not only to the technology for installing roofing slabs, but also to what kind of screws should be used for fastening polycarbonate.

When fastening polycarbonate sheets, it is necessary to focus on special hardware, which includes the fastening element itself, a sealing washer and a gasket. Their role is as follows:

The sealing washer is necessary for maximum complete fixation of the sheet by the fastening element. It should fit as tightly as possible;
The gasket serves to seal the attachment point. This is especially important if the structure is located outdoors and is exposed to the adverse effects of external factors;
The fastening element passes through the polycarbonate sheet and is screwed into the structure frame, providing a tight and stable fixation of the roofing material.

It is important to know that before screwing in a self-tapping screw for cellular polycarbonate or monolithic sheet, you must first drill a hole where it passes through the sheet. If this is not done, then when the sheet is passed through with a self-tapping screw, damage to the roofing material may occur.

What size should a self-tapping screw be for cellular polycarbonate?

It is optimal to use self-tapping screws for polycarbonate with a diameter of 5–8 mm - this is the most common diameter of thermal washers.

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Purchasing hardware of a larger diameter can lead to a significant increase in installation time - as a rule, thermal washers larger than 8 mm in size are supplied by most hardware stores only on order.

And their use is mandatory - otherwise, polycarbonate screws will simply crush the canvas with excessive force, and with insufficient force they will not be able to ensure its stable fixation.

Typically, screws for fastening polycarbonate are chosen with a length of about 30–40 mm. Hardware of a shorter length may not be firmly fixed in the base, while a longer one may pass right through it, which negatively affects the aesthetic appearance of the entire structure.

Traditionally, self-tapping screws for polycarbonate greenhouses are used with a thickness of 5 mm and a length of 30 mm. These sizes of hardware are more than enough for reliable fixation of polycarbonate sheets.

What type of head does the roofing screw for polycarbonate come with?

The heads of roofing screws are usually made in the shape of a truncated cone. They are available in several configurations:

with slots for cross bit Ph or PZ. This is one of the most common options;
with edges for tightening with a wrench or socket. Also used quite often;
with a hole for a hex key. Traditionally, this option is anti-vandal, since special tools are needed to unscrew such screws.

The installer determines which screws for polycarbonate to choose independently.

Regardless of the type of head, they ensure reliable fixation of sheets to the base. But when twisting them, it is important to follow a number of recommendations:

the equipment of the tool used (for example, a screwdriver) must fully correspond to the configuration of the head. Otherwise, you risk tearing off the edges and not tightening the screw, which makes reliable fixation of polycarbonate panels impossible;
It is recommended to set the minimum rotation speed of the tool when tightening. This will prevent deformation of the roofing;
Regardless of the type of hardware, you should always use washers for self-tapping screws to fasten polycarbonate: they will prevent damage to the sheets and ensure the tightness of the fastening site.

A self-tapping screw with a thermal washer for polycarbonate is the best solution for correctly and securely attaching the roofing material to the frame. In this case, the type of hat does not play a big role. After all, regardless of the type, they perform one function - they press the panels to the base.

Are there self-tapping screws for polycarbonate for metal?

Self-tapping screws for fastening polycarbonate to metal are almost any type of self-tapping screws with a wide head, designed for screwing into metal bases. A characteristic feature of metal hardware is:

Instead of a point, the tip of the self-tapping screw is equipped with a drill. Thanks to this, it becomes possible to screw hardware into a metal base without pre-drilling it;
stronger steel is used for the manufacture of hardware, which has a positive effect on the durability and reliability of fastening;
fasteners of this type are additionally treated with a protective zinc coating - this can be easily understood by paying attention to the characteristic silver color of the hardware. This coating protects them from corrosion, which also has a positive effect on their service life.

In order for polycarbonate to last as long as possible, fastening to metal with self-tapping screws should only be done using thermal washers.

What screws to use for polycarbonate on wood

As in the case of hardware for metal bases, fasteners for wooden profiles can only be secured to polycarbonate plates when using thermal washers. With hardware of this type, the roof is attached to a wooden base - due to the wide thread pitch, the fastener bites tightly into the wood and does not require further adjustment.

Is it possible to fasten polycarbonate with roofing screws?

The hardware for fastening the roof is equipped with press washers that ensure the tightness of the fastening points. Alternatively, you can use them to attach polycarbonate sheets, but then it is important not to overtighten them. And if possible, use thermal washers.

The choice of fasteners is truly unlimited: if desired, you can even use bolts to fasten polycarbonate or even rivets.

Average consumption of self-tapping screws per 1m2 of polycarbonate

How many self-tapping screws you will need for polycarbonate is quite easy to calculate. It is necessary to take into account the length and width of the polycarbonate panel, as well as the number of panels.

Let's look at a simple example of the consumption of self-tapping screws for polycarbonate per 1m2:

since the sheets are fastened along the perimeter, in total we need to provide fastening for a section 4 m long;
self-tapping screws with a washer for polycarbonate are mounted with an average pitch of 30 cm;
Divide 140 by 30, round up and get 14.

This is the amount of hardware that is enough to attach 1 m2 of polycarbonate roofing.

We also suggest that you watch the video, which describes all the rules for installing a polymer roof and why you should use self-tapping screws for thermal washers to attach polycarbonate.

Source: https://polygalvostok.ru/kreplenie-polikarbonata-samorezami-kak-vybrat-samorezy-i-kak-pravilno-krepit/

How to screw a self-tapping screw into a tile?

Photo from website: Met-all.org

For many years, tiles have remained the most relevant and sought-after facing material, which is suitable for finishing rooms with a variety of extreme conditions, for example, bathrooms and kitchens, pantries and hallways. It almost does not absorb water at all, does not ignite and does not emit toxins, and above all, it is easy to clean and does not contribute to the development of bacteria and fungi.

However, fired ceramics are quite hard, and they can also be fragile, which is why it can be difficult to figure out how to make holes in such lining for sockets, switches, and make fastenings for interior items and furniture. Therefore, when doing renovations, everyone is faced with the question of how to drill tiles in the bathroom so that they do not crack. This is the question we will try to answer today.

General tips and tricks: how to drill tiles in the bathroom

Photo from website: DecorStars.ru

It is hardly possible to do without drilling tiles in the bathroom during renovations or after them. After all, you will have to attach shelves and wall cabinets to the walls, install lighting, install a heated towel rail, socket, switch and much more.

If you simply try to gouge a hole on a tiled wall, the ceramic tiles will inevitably crack and all the work will go down the drain. The broken element will have to be completely removed and replaced with another, if available.

Therefore, you should think in advance and find out what you need to know, be able to understand, and also have on hand in order to drill tiles in the bathroom efficiently and easily without chips and cracks.

If you have fairly wide joints between the tiles, it makes sense to try to orient the fasteners so that they fit right into the space between the tiles. Then your task will be simplified as much as possible, since it will be easy to screw a dowel into the grout and screw a self-tapping screw into it. This will not affect the strength of the fastening in any way, but this solution will definitely save you from many troubles.

To simplify your task as much as possible, you should completely or at least partially eliminate even the very possibility that the drill will slip; the easiest way is to seal the drilling site with a piece of masking tape.
You should not start drilling at the very edge of the tile; it is better to make an indent from it, no less than 2-3 centimeters.
Before drilling the tile, be sure to clearly mark the location where you want to make the hole. The easiest way to do this is with a marker, which can then be easily washed off the glazed surface if necessary.
In order for everything to go smoothly, you should choose special drills, but it’s better to talk about this separately, which we will do below.
When figuring out how to properly drill tiles in the bathroom, keep in mind that you should never allow the drill, or the tile itself, to overheat, otherwise the glaze may become covered with a network of cracks and the finishing element will be hopelessly damaged.
Immediately turn off the reverse on the tool, if it has one; drilling must occur exclusively in one direction, otherwise the tile will crack.
You need to find the optimal pressure force on the drill. Touching it too lightly will prevent you from drilling through the tiles, while touching it too hard may cause it to crack.

Photo from the site: O-vannoy.ru

You definitely need to pay attention to another important point - any power tool you choose for work, a hammer drill, a drill or a screwdriver, must have a low-speed switching mode, otherwise you will definitely not achieve anything good.

Elementary technology: drilling tiles in the bathroom

In order to hang a shelf, hooks, install electrical equipment and for any other purposes, you may need to make a hole in a solid tile and it can be successfully drilled if you strictly follow all the tips and act according to the technological process. In fact, the operation algorithm is simple: you need to drill a hole that penetrates the wall, insert a dowel into it, and then screw in a screw or self-tapping screw. But first you should find out how to drill tiles in the bathroom, since the success of the entire enterprise may depend on this.

Advantages and Disadvantages of Tools

Before you start working directly, it doesn’t hurt to think about how to drill ceramic tiles in the bathroom, that is, to finally decide on the equipment. Today on the market there is a wide selection of a wide variety of drills, hammer drills, hand rotators and who knows what else. Among this variety, you should choose only the most suitable one.

Photo from website: belkin-labs.ru

The most suitable tool for drilling tiles is an electric drill, which has variable speed. It will be much more convenient and faster to work with it, and low speeds will eliminate or at least minimize the risk of cracking of the glazed ceramic surface. A high-quality drill is not cheap, but it is an indispensable assistant for the home craftsman, so you should not waste money on equipment from well-known manufacturers.

Photo from the site: expertcen.ru

A battery-powered screwdriver is the second profitable and convenient tool that is suitable for drilling tiles in the bathroom without any problems. It also has one more advantageous property - it can be used even where the equipment cannot be connected to the network.

Photo from the site: articulo.mercadolibre.com.uy

Rotary hammers from well-known companies also have enviable multifunctionality, so you can use such a tool when drilling holes in tiles. True, the price of such equipment is even higher than that of a drill if we are talking about professional models.

Photo from the site: proinstrumentinfo.ru

The most tedious and time-consuming process is drilling ceramics using a hand drill. However, if you only need to make a few small holes, you can try to do it this way.

Selecting consumables and components

Low-speed drills, screwdrivers or hammer drills are mainly used for drilling holes in ceramic tiles. But choosing the right tool is only half the battle, since it is important to understand which drill to use to drill tiles in the bathroom so as not to damage the glazed surface. Moreover, you must take into account that drills for brick or concrete can be immediately put aside; their use does not bode well, the tile will simply crack and will have to be replaced.

There are three most suitable consumable options that will best suit your purposes:

Photo from the site: Remoskop.ru

The best drills for drilling dense and slippery ceramics are diamond-coated drills, which makes their tips look like sparklers. These are quite expensive components, because their production uses chips of natural diamonds and it is impractical to purchase such drills for making one or two holes. If you are faced with major repairs, construction or finishing, this is your professional occupation, then you simply must have it in your “arsenal”.
The second place is rightfully occupied by spear-shaped drill bits for drills with pobedite tips. They are designed in such a way as not to split the tiles, and the special sharpening does not allow them to slip off when starting work. Due to this shape, the adhesion of arrow-shaped drills to the surface improves, and the risk of cracks and chips is reduced. The price of such drills is much lower than diamond ones, but they cannot be called cheap either.
When figuring out how to drill tiles in the bathroom, you can pay attention to drills made of refractory, durable metals, which are designed for processing metal surfaces, if nothing else is at hand. The cost of such a drill bit for a drill is quite affordable for everyone, however, you will have to work at your own peril and risk. It won’t hurt if such equipment is new, perfectly sharpened, and also has a pobedite coating or tip.

How to choose a fugue for tiles?

Photo from the site: VannayaSovety.ru

Thus, it will not be at all difficult to decide on drills and all that remains is to figure out how to drill the tiles in the bathroom step by step so that they do not burst or become cracked, which will add more work to you in replacing them.

How to drill tiles in the bathroom correctly

Before you start working and drilling the tiles in the bathroom to prevent them from cracking, you need to take all the measurements correctly, and also mark the places where you need to make holes. Since it will hardly be possible to repair them without a trace, you should be especially careful and measure everything twice before doing anything. As already mentioned, stick a piece of masking tape in the marked place, which will prevent your drill from slipping on the smooth and slippery glaze of the tile.

Should know

Whatever tool you use and what consumables you purchase for it, it is very important to try to hold it exclusively at a ninety-degree angle while working. If this is not done, the drill will constantly slip, and the tile, most likely, will even burst, crack and will have to be replaced.

On the surface of the glued tape, use a marker or felt-tip pen to place a dot or cross where you will place the drill.
Keep the drill perpendicular to the wall, otherwise you can damage the tiles, the drill bit, and even injure yourself.
Press the tip of the drill firmly against the marked area and start drilling at low speeds, slowly, but smoothly and gradually.
When the ceramic is drilled and the resulting hole is not deep enough, for example, to install a dowel, simply replace the drill with one that is suitable for brick or concrete, depending on the wall material.

Photo from the site: vanna-prosto.ru

After drilling, be sure to blow off any remaining dust and debris, and only then install the dowel. Moreover, you need to make sure that the edge of the plastic dowel does not protrude beyond the edge of the tile surface; it should be slightly inside, not outside, otherwise it will damage the glaze during operation.

Large holes for pipes and sockets

The previous method is suitable for drilling tiles in the bathroom with a drill, but with the condition that the holes need to be of small diameter. But what to do when you need to drill it for a switch, communications, or for other purposes? Everything is quite simple, you will have to use special attachments that will help you cope with this task.

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Difficult, but possible: with a drill in a circle

The simplest solution would be to draw a circle of the required diameter on the surface, and then using a regular drill with a Pobedit tip or diamond coating, carefully drill a series of holes around the circumference.

Source: http://hopper-time.ru/kak-vkrutit-samorez-v-plitku/

It seems like a no-brainer, but you have to know how to screw in a self-tapping screw! Read!

Self-tapping screws are a very common product, widely used for various types of fasteners. However, in order for its capabilities to be used to the maximum and for the fastening made with its help to have maximum reliability, it is necessary to be able to correctly select and screw the self-tapping screw into the load-bearing surface. We intend to pay close attention to these issues today.

The choice of self-tapping screws according to the type of cutting available on them is small: they can be universal or for wood, the pitch of which is much larger.

If you have to screw a self-tapping screw into metal, chipboard or plywood during your work, feel free to purchase universal products. If the work is to be done with wood, then only those that are designed specifically for this material are suitable. Why, you ask. The answer is simple. For the fixation to be reliable, the material must “settle” securely between the threads. The wood structure cannot do this if the thread pitch is too small.

What to use when you need to screw in a self-tapping screw

If there is only one self-tapping screw or if their number is very small, you can easily use a regular screwdriver. If you are assembling some complex structure with a large number of fasteners, then it would be better to arm yourself with a good-quality screwdriver.

To choose the right screwdriver, read our article, which we devoted specifically to this issue. The effectiveness of this device increases significantly if it is used with quality bits.

Now let's move on to the most important thing - screwing in the screws.

General technology for screwing in self-tapping screws

In order for the self-tapping screw to be securely fixed in the base material, when screwing it in, the following general technology should be followed:

Use an awl or thin drill to mark the installation location;
Place the tip of the product in the intended hole;
carefully screw it in so that the position of the screw becomes stable;
then continue screwing at maximum speed (if a screwdriver is used) and maximum force;
at the last stage, reduce the force and speed to avoid damage to the screw and the material.

Concrete

Perhaps the method of installation in concrete is now known to everyone: first you need to install a dowel in it, and then you need to screw the self-tapping screw into this already installed dowel. According to many craftsmen, the reliability of fixation increases significantly if the surface of the dowel is lubricated with appropriate glue.

To drill holes, it is best to use a hammer drill, the rules for choosing which we have already written about earlier. By installing self-tapping screws on dowels, you can use both universal products and wood.

Ceramic tiles and bricks

If you need to screw a self-tapping screw into a brick or ceramic tile, proceed in the same way as with concrete. But to drill holes it is better to use a drill.

Useful tips for drilling tiles can be found here.

Soft non-ferrous metals

To ensure reliable fastening in such metals, before screwing the product into them, you should drill a hole of a very small diameter, smaller than the diameter of the self-tapping screw. Screwing it in is done without any special tricks. The only important point is that it is necessary to use only universal type products.

Hard metals

The diameter of the pre-drilled hole in such material should be equal to the diameter of the universal screw without taking into account its thread or slightly exceed it. However, some hard metals - cast iron, for example - are simply too tough for self-tapping screws.

Plastic

Self-tapping screws are not suitable for all types of plastic; some of its varieties may simply collapse when screwed in. If you are completely sure that your plastic product is not one of them, then in this case you should use the technology that was described above for soft metals, using self-tapping screws for wood.

Wood and wood panels

Naturally, in this case, you should again use self-tapping screws for wood. If they are screwed into thin boards or slabs, as well as into hard wood, a thin receiving hole must first be drilled. The easiest way to work is with thick boards made of soft wood: no special tricks are required for this.

Drywall: pay special attention!

Drywall is a material in which screwing screws into which involves the largest number of different nuances. The main ones include:

the optimal screw-in step for this fastener is considered to be a distance of about 70 cm;
When using a screwdriver when working, you should start immediately at maximum speed, gradually reducing it as the screw deepens;
When working with a regular screwdriver, you need to ensure smooth and restrained movements;
the head of the twisted screw should press the cardboard surface of the sheet without breaking through it. This condition is the key to maximum strength of the future structure;
if the surface of the sheet is torn, the screw should be removed, the hole should be filled with putty and a new place to install the fastener should be selected at a distance of about 5-9 cm.

When working with drywall, the type of self-tapping screw is selected based on the material of the supporting sheathing. If it is wooden, then self-tapping screws with wood threads are used; if it is metal, then universal ones are used.

So, we have introduced you to the basic rules that allow you to screw a self-tapping screw into any metal in such a way as to ensure maximum reliability of the structures you create. We hope that our recommendations will allow you to eliminate any defects and make any repairs the way you originally intended.

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Source: https://www.allremont59.ru/instrumentyi-materialyi/technika-instrumenti/kak-vkrutit-samorez.html

How to choose a drill for a self-tapping screw

Drilling a hole in the wall is only half the battle. To complete the fastening task, you need to screw more screws, directly into the drilled hole or into the dowels.

A self-tapping screw is a type of fastener, which is a rod with a sharp thread and a head designed to transmit torque when screwing while simultaneously cutting threads in the elements being connected.

The range of self-tapping screws for wall mounting on sale tends to be infinite. The task of selecting hardware (from the phrase “metal products”) for fastening to the wall seems insoluble. But if you put everything into detail, it becomes clear what kind of screw is required for each specific case.

Self-tapping screws are made of brass, carbon and stainless steel (the metal contains more than 13% chromium). The most widely used self-tapping screws are made of carbon steel with a protective coating. They are the cheapest.

Carbon steel self-tapping screws are available with the following types of protective coatings. Oxidized, black - for fastening in rooms with normal humidity. Galvanized silver - for indoor and outdoor use. Galvanized, yellow – for indoor and outdoor use. They have a golden decorative appearance. Look good on gold-plated door locks and hinges.

Types and types of self-tapping screws

Depending on the type of thread, there are self-tapping screws: with a universal thread, with a rare thread pitch, and with a frequent one. Self-tapping screws with a frequent thread pitch are designed for screwing into metal sheets. For example, if you need to hang a heavy picture on a plasterboard wall.

Use a powerful magnet to find the place where the profile to which the sheets are screwed is located, and screw the self-tapping screw through the drywall into the profile.

If the screw does not have a drill at the end, then you must first drill a hole in the metal with a diameter equal to the internal diameter of the screw thread.

For fastening sheets of roofing iron, there are special galvanized self-tapping screws of two sizes: 4.8×16 and 4.8×19 with a hex head. A type of self-tapping screws with a rare thread pitch are designed specifically for screwing into soft materials, such as plastic, plaster, asbestos, wooden boards and the like. Universal – designed for screwing into any materials. Of course, it is better to use specially designed ones, but any will hold securely.

A separate line worth noting is the self-tapping screw - a confirmat, specially created for the manufacture of furniture from wood and chipboard. The confirmat type self-tapping screw, with a clean surface and a large area of the lateral surface of the thread, allows you to obtain a high-strength and precise connection of elements. The most popular confirmat size is 7×50. Before screwing the confirmat, a hole with a diameter of 4.5 or 7 mm is required, respectively. The confirmation head is made for a hex key.

To hide the head of a tightened self-tapping screw, Confirmat produces decorative plastic buttons - plugs of any color. The plug with its protrusion is tightly inserted into the hexagonal hole of the confirmation head and disguises it to match the color of the furniture.

It should also be noted that there are self-tapping screws for concrete, which are screwed without a dowel directly into the drilled hole. When screwing into porous material and with cavities, drilling holes with a hammer drill is not allowed. To make it easier to screw, a little bit of any machine oil should be injected into the hole before screwing. Used for permanent fastening. I don’t use them because they are difficult to tighten and even more difficult to unscrew.

There are also self-tapping screws that have a herringbone thread profile. They are driven into the hole at the same time as the dowel with a hammer and are also intended for fastening “forever”. Their use is justified, for example, when attaching a baguette for a suspended ceiling or when installing plastic window frames. Their advantage is the speed of installation.

The head is the extended part of the self-tapping screw, designed to hold fixed objects and ensure the transmission of torque from the tool to the self-tapping screw.

Self-tapping screws are designated as follows: 3×25, where 3 is the outer diameter of the thread (mm), 25 is the length of the self-tapping screw measured from the end of the head to the tip of the rod (mm).

Selecting a self-tapping screw depending on the load

Self-tapping screws have a greater safety margin for shearing and bending. The main thing is to securely fasten it to the wall. The more porous the structure of the wall material, the thicker and longer the dowel should be in order to have a larger engagement area, and accordingly the standard size of the self-tapping screw. If in doubt about the choice, it is better to choose a larger self-tapping screw for fastening.

* – the self-tapping screw is screwed in after installing a special dowel for drywall.

An anchor is a type of finished fastener for securing heavy products by wedging into the wall. Anchor translated from German means anchor. Practically, this is the same dowel and self-tapping screw, but the difference is that the dowel is made of metal, and the self-tapping screw is a bolt or stud with a metric thread that screws into a conical nut.

The conical nut, entering the tubular split base of the anchor, pushes it apart, creating a greater moment of friction with the wall material. The use of anchors is only possible when fastening in very hard materials, dense brick, concrete and stone. In everyday life, such cases may arise when attaching a heavy chandelier to a concrete ceiling or when installing a suspended ceiling of a larger area.

The use of an anchor is justified, for example, for fastening sports equipment in an apartment - rings, wall bars. Children's swings on anchors will also hold securely.

Anchors are expensive and therefore their use is justified only if there is no alternative method of fastening. The anchor is indispensable, for example, when attaching a heavy chandelier to the ceiling. In practice, in many cases, fastening with an anchor can be replaced with fastening with plastic dowels paired with self-tapping screws, increasing their number.

Source: https://respect-kovka.com/kak-podobrat-sverlo-pod-samorez/

How to choose the right drill bit for metal screws

Do you need to securely fasten any element to a metal surface? Then you definitely need to use metal screws. Such fasteners are quite inexpensive, but at the same time they are reliable fasteners. Using them, you can do all the necessary work related to repairs several times faster.

These products externally resemble ordinary screws, although the difference is still significant, namely in the tip. For self-tapping screws, it is made in the form of a small drill (mini drill).

Therefore, the principle of screwing is that they first, as it were, cut through the surface, and then are screwed in using a screw thread. The metal cap allows you to firmly fix the work surface.

There are also ordinary black self-tapping screws with a sharp tip at the end, which you just can’t tighten. Before fastening products with their help, you will need to make holes.

Tips for choosing a drill for self-tapping screws

There are two types of self-tapping screws: for wood and for metal bases. For metal surfaces, use a self-tapping screw with a thread that has a small distance between the turns. Thanks to this, the fixation of the elements is reliable. When using fasteners with a diameter of 3.5 mm, no pre-drilling is necessary. If the work involves the use of thin sheet metal, it is necessary to drill holes in advance.

The thickness of the hole being drilled directly depends on the thickness of the material used. Having guessed the size of the drill, you can then screw in the self-tapping screw manually using a regular screwdriver.

Table of recommended drill diameters for a certain metal thickness

metal thickness, mm	0,5	0,7	1,0	1,5	2,0	3,0	4,0
drill diameter, mm	—	3,3	3,4	3,5	3,6	3,7	3,8

Typically, drills with a diameter of 3.4 are used. Other species are also found, but much less frequently.

Fastenings to metal structures: main features

Metal screws are used when you need to securely fix any material to a metal structure. Their caps are hexagonal, hemispherical, with a press washer . Carbon steel is used in the production of such fasteners. In order to extend their service life, when used in rooms with high humidity, they are additionally processed (galvanized).

In order to install it into the metal base, you will need self-tapping screws with a drill. Such fastenings are necessary if the material is more than 0.9 mm thick and no pre-drilling has been carried out.

How to properly screw a self-tapping screw into metal

Fasteners can have heads of different diameters. Therefore, you should get a suitable screwdriver or screwdriver with a suitable attachment. If you plan to tighten only 1-3 screws, then you can get by with a screwdriver. If you are planning a larger-scale job, it is impossible to complete the plan without a screwdriver. This tool will allow you to quickly and efficiently perform all the necessary work.

The general screwing technology is as follows:

First, you need to determine the type of material, since there is a soft metal - aluminum and there is steel.
If you have to work with steel, you first need to make holes.
Install the fastener “in position”. Carefully but firmly, you need to screw it in with a drill until it goes deep and secures into the material. After this, the drill speed can be increased. At the last stage, it is better to reduce the speed to avoid damaging the screw.
When working with aluminum, you can do without pre-drilling. Screwing is done using a screwdriver.

Source: https://stroitesnami.com/clauses/sverlo-pod-samorezy/