How to unscrew a bolt with torn edges: proven methods. What tool is suitable for unscrewing broken parts: how to unscrew a bolt with torn edges How to unscrew a cut bolt

Basically, every repair does not go smoothly, but with the emergence of small problems, the elimination of which requires effort and time. What to do in a situation where you need to disassemble the structure, but the bolt is rusty or damaged, we will discuss further.

At home, not everyone has a master at hand necessary equipment, but this problem can be dealt with using improvised means.

How to unscrew a broken bolt?

Basic methods:

Clean the surface with a metal brush and treat it with diesel fuel or kerosene. They try to unscrew the nut with a spanner. Although there is no absolute guarantee that it will unscrew.
Using a chisel and hammer, strike in the direction of unscrewing. This method is not suitable for a small nut.
Gas wrench with powerful clamp good remedy in this situation. It’s easy for them to grab even round objects, but it’s harder to hard to reach places. The longer the handle, the easier it is to unscrew.
When the fastening material is large and difficult to unscrew, you can use welding equipment to apply metal coating and prepare with a file the required form Full construction.
Use a drill to cut out a hole inside the body of the fastener and thread a rod through it L-shaped, which will serve as a handle, and is removed.

When there is enough space to use an adjustable wrench or pliers, this is good, but what to do in other situations?

How to unscrew a hex or sprocket head bolt

To remove an element use a gas wrench with compression of the part, make a cut on the head with a grinder and unscrew it with a screwdriver, an extractor of the appropriate size, special tools (wrench, pin driver), which are beneficial to purchase only if you have to deal with such problems quite often.

Select the TORX sprocket according to size (it should not be large and the slots should fit into the hole for the hexagon). It is inserted tightly into the head and the bolt is jerkily unscrewed to avoid the sprocket spline from breaking off. When driving sprockets with holes in the center, they break off, so their use is not recommended.

In any construction and auto store extractor kits for sale. Externally, this device looks like a metal rod with a conical thread on the left side and a faceted base on the right. They are used to unscrew nuts with torn edges. To do this, drill a hole strictly in the center of the bolt and drive the extractor there the right size and unscrew it with pliers. This is done simply and quickly, because the extractor has the opposite cutting.

Drill with reverse – irreplaceable thing. Use a thin drill to make a hole near the bolt. Take a left-hand rotation drill with a smaller diameter and drill out the damaged bolt in inverse rotation mode.

If the bolt head breaks off

In this case, you need to be patient and choose suitable option actions.

Three ways:

Drill a hole 3 cm smaller than the diameter of the bolt and screw a tap with a left-hand thread into it until the broken part begins to unscrew.
If part of the bolt protrudes, then you can make a cut on it using a grinder under a slotted screwdriver and begin unscrewing it.
A hole is made in the base into which the extractor is screwed counterclockwise. Then the damaged element is removed with a key.

The process takes a few minutes, but there are countersunk head products under a hexagon, the edges of which are easily torn off. A Torx of the appropriate size will help to cope with this problem.

How to drill out a broken bolt

Professionals advise using a small-diameter drill and making sure that it does not tilt to the sides when working. When purchasing, you need to focus on the country of origin and cost. High quality drills cannot be cheap, sharpened in a special way and made of hardened steel.

Unscrewing nuts and bolts produce slowly and consistently, you cannot rush in this case, otherwise unforeseen problems will arise later and a loss of time to eliminate them. For example, many auto repairmen rush to unscrew rusty bolts that break. A lot of time is wasted fixing errors. Therefore, it is necessary to immediately plan the course of action. How to deal with rusty bolts, we will discuss further.

How to unscrew a stuck bolt

Car repairs are often made more difficult due to corrosion and oxidation of fasteners. For example, during assembly at the factory, the master did not treat the threads with lubricants, and during operation water got in there. As a result, the bolt seemed to be stuck tightly, but such a nuisance can be dealt with in several ways.

Unscrew a rusty bolt or nut by tapping

When tapping from the bolt rust and scale come off, so it becomes easier to unscrew it. The operation is carried out with a hammer, turning with a special tool to create torque. Be careful, as you can damage the product and have to drill it out. After removing the fastener, it is cleaned of rust and treated with graphite lubricant. If available, place a boot on the connection.

Using solvents

In the arsenal of any experienced car enthusiast there is always a set of liquids to combat rust and other deposits. They mainly use WD-40 with good penetrating ability into micro-gaps, the cost of which is starts from 100 rubles. Along with it, brake fluid, white spirit, kerosene, and Coca-Cola are used. Unlike WD-40, other liquids have a weaker effect, and it is better to pour them into a container and place the stuck compound in it for greater effect.

If the bolt is stuck on the front pillar, the solvent can be carefully poured into the “glass”. The main thing is not to damage the rubber bands on the racks, otherwise you will have to change them.

Moisten a rag with any product, wrap it around the nut and leave it for a while. Then they tap the bolt to destroy the softened rust and begin to unscrew it.

Thermal method

When the solvent does not cope with the task, you can try exposure to fire and cold. Any large auto or hardware store sells a gas burner; it is used to heat the bolt to bright orange color. Then they cool it with machine oil and try to weaken it. If the attempt fails, the process is repeated again.

This method does not always help, and if you are close to paint coating, the fuel tank is very dangerous. When working with gas burner You must follow fire safety rules and do not use it if you do not have a fire extinguisher at hand.

Use freezing sprays to preserve the bolt for later use. But such reagents are mainly used by professionals, since in living conditions This it's a costly and unprofitable business.

How to unscrew a licked bolt

When turning the bolt, pry it up with a nail puller and pull it out to the maximum possible height, leave it in tension and gradually unscrew it with a wrench. When you don't have a nail puller, you can use a screwdriver. A small bolt is removed using pliers by the head. If it does not give in immediately, then rotate it, clamping it with pliers counterclockwise with upward force.

Use a tap, insert it all the way. If you don’t have it at hand, then a screwdriver with a cone-shaped edge will do, which you carefully hammer in until it stops and try to unscrew it.

To prevent such situations from reoccurring, they must be treated with graphite lubricant before tightening the bolts. But grease or lithol is not used for this purpose, because they are used for rubbing parts, and bolted connections After lubrication they jam.

Almost all equipment is assembled using fastenings that use bolts or other products. But when it becomes necessary to unscrew them, they may turn out to be rusted and no longer suitable for use.

These elements often end up with torn edges, threads, or their head breaks off. Buthow to unscrew a bolt with broken edgesso as not to spoil the entire structure?

In contact with

Why are fasteners needed?

Fastening elements are essential elements mechanical engineering, which are used almost everywhere. The most common fasteners that have threads are:

screws;
bolts;
nuts

A bolt, like a screw, is a rod with a head that has one threaded end. Screws are usually classified into two types:

Installation ones that fix the parts mutually.
Fasteners that are used for detachable connections.

Screw heads can be cross-slotted or single-slotted.

As a rule, this element is necessary if you need to fasten additional element. Often, a machine screw with a countersunk head is used instead of bolts, since the protruding head interferes with some mechanisms.

Most often, screws are used when there is a need to fix parts that have been mounted on shafts or axles.

As for bolts, they form a connection using a threaded hole and a nut.Hex bolthas a head on one side and a screw thread on the other. They are intended for fastening parts that have a small thickness, or if it is necessary to frequently separate elements. That's why it's so important to know how correct unscrew the stuck bolt.

The nuts are fastener with a threaded type structural hole designed to transmit torque. Nuts are produced various shapes, and this depends on the conditions of use.

Reasons for the failure of fasteners

Typically, the reasons why a bolt becomes unusable can be the following:

sticking;
displacement of parts that are held together by bolts;
excessive over-tightening during installation;
use of inappropriate keys;
Uneven efforts during unscrewing.

Preparatory work

Depending on the reason why the bolt does not come off, various preparatory measures may be required.

For example:

Open the bolt joint using a penetrating fluid that is designed to reduce friction. For this purpose, you can use substances such as kerosene, brake fluid or WD-40. To do this, you will need to apply the substance to the connection and leave for about an hour. Only after this time has passed can you begin to unscrew.
Some people use a hammer to tap the bolt, but only so that the existing threads are not damaged.
You can try to slightly heat the element that has become stuck using a burner. This procedure causes the resulting dirt and rust to burn off, after which the metal of the bolt becomes more pliable.

Experts, answering the question,how to unscrew a screw with stripped edges, they say that this is done in absolutely the same way.

How to unscrew a bolt with broken edges

Once all preparation procedures are completed, you can begin extraction, buthow to unscrew a bolt with broken edges? First of all, for this you need to purchase everything necessary tools. In order to implement your plans, you can use the following methods:

Take a gas wrench, but it is only good if the space allows it. It is possible to use a gas wrench not only on bolts that have a surface with edges, but also on cylindrical bolts when the threads are completely stripped.
A damaged bolt can also be removed using spanners, which have different heads for torn edges. In this case, you will need to select the proper size of the head, otherwise it will not be possible to unscrew it.

Important! The longer the key, the easier it will be to unscrew the fastener.

If using the methods described above does not produce results, then you can resort to other methods.

Prices for gas keys

gas key

How to unscrew a screw with a screwdriver

Often the situation with bolts and screws confuses the owner, because not everyone knowshow to unscrew a bolt if it won't come out.

When there is practically no access, you can make a notch with a chisel or grinder. After this manipulation, unscrewing the bolt with a screwdriver will be quite simple.

Although in some cases this does not give the desired result, then you can take the same screwdriver, placing it at an angle, and lightly tap it. But this must be done so that the bolt begins to rotate.

To the question how to unscrew a hexagon with torn edges, experts say that this fastener can be removed using the following methods:

Using a needle file, which will help you get the size for the hexagon.
Using a TORX sprocket, but it is important that it is of the proper size.
A screwdriver that can be used if you first make an even notch.
Using an extractor that screws into the hex hole.

Internal sprocket or hex bolt

It can be unscrewed using the following methods:

A flat-head screwdriver, but in this case you will need to make a notch with a grinder or a hacksaw. This must be done so that the cut has clear vertical walls, otherwise the screwdriver will jump off.
A TORX sprocket, which should not fit into the hole with splines, but should not be larger than this size. She must cut through the cap and fit tightly into it. Next, you should unscrew the bolt jerkily, because otherwise the slot may break.
Using a drill, drill and extractors. To carry out the unscrewing procedure, you will need to drill a hole in the center and drive an extractor of the required size into it. After this, use pliers to unscrew the element. The unscrewing procedure using an extractor is very simple, since it has a thread that is opposite to the thread.
A drill with a left-hand rotation or reverse drill, the diameter of which is smaller than the deformed bolt. To carry out this procedure, you will need to drill a small hole with a thin drill and only then insert the left-hand drill. Naturally, now the drill will need to be set to intensive rotation mode.

Attention! You cannot use an asterisk that has a hole in the center, as they will break when driven in.

How to unscrew a hex bolt

This fastener can be easily unscrewed in the following ways:

Using the above asterisk.
Using a file that makes the proper size for a hexagon.
A screwdriver, but before that, just like in the previous options, you will need to make an even notch.
An extractor, the method of use of which has already been described.

How to unscrew an asterisk bolt with torn edges

To achieve your plans, you need to knowhow to unscrew the sprocket bolt. After all, unscrewing such a fastening element is possible in the same ways as indicated above:

After making the cut, simply unscrew the bolt using a flat-head screwdriver.
Using an adjustable wrench, which is used to crimp the part.
Using an extractor.

How to unscrew a bolt with special equipment

The bolts are unscrewed using the most various devices, and this will allow drill out the bolt without damaging the thread, For example:

keys;
screwdriver;
pneumatic impact wrench;
ratchet.

But often it is not possible to solve the problem using the methods listed above, and then others will come to the rescuetools for unscrewing broken bolts:

Thin open-end wrenches, but they are absolutely not suitable in the case of rusty or stuck bolts, as this breaks off the edges.
Impact wrench.
Socket wrenches, which are more applicable, since they cover the head of the product more tightly.
Welding equipment.
Hexagonal socket wrench, which is less likely to cause edge breakage.
Air impact wrench.
A multiplier that allows you to apply more force to a stuck bolt.
Screwdriver with large handle.
Clamping tool.
Set of extractors.
A hairpin driver that is perfect for products that have a high head.

Prices for impact wrenches

impact wrench

Working with a set of extractors

Initially, you will need to mark the center, which requires a center punch and a hammer. A pilot hole is then drilled to be used by the extractor.

Attention!In this case, it is important that the axis is not displaced, and the depth of this hole should be no more than three diameters of the drill used.

The extractor will need to be inserted into the hole and slightly tapped to make the fixation more reliable. Only then can you use a tap to screw in the extractor. Working with it is quite simple, since after the extractor enters the product all the way, the product will begin to turn out.

Working with welding equipment

Ifthe bolt broke, how to unscrew itwithout damaging the equipment itself? Most quick way- this is to use welding.

To do this, take a nut of a suitable size and weld it to the broken part, but only with inside. After this, the product can simply be unscrewed from the fastening element using a wrench.

Welding equipment makes it possible to unscrew a screw or bolt that has a broken head or torn edges.

In a situation where the head is torn off, it is necessary to melt a small amount of metal onto the remaining part, then put a regular nut on it and weld it.

Unscrewing with a wrench

Unfortunately, this tool cannot be used if the head of the fastener has been torn off.How to unscrew a licked bolt, described in another paragraph. To unscrew it with a wrench, you need to put a suitable attachment on it. The unscrewing process itself occurs due to the impact mechanism of the wrench.

The impact wrench itself is a device that facilitates the process of assembling and disassembling bolt-nut connections. It is very convenient if wrench cannot be used.

Once the impact wrench is started, power is supplied to the motor, which transfers power to the gearbox, which causes the chuck to function. Almost all devices that are designed to unscrew nuts have a special spring that allows the chuck to rotate back. This fact makes it possible to use the impact wrench not only in mechanical engineering, but also in many other fields of activity.

The situation often arises thatThe bolt won't come off, what should I do?in that case, if there are no special skills? There are several simple tips, which make it easier to unscrew the fastener:

In order to carry out this procedure faster, the element should be preheated.
How to unscrew a bolt with stripped threads? In this case, you can use a hex key.
While working, you can use acetone or oil for lubrication.
Using a drill with a reverse thread can greatly facilitate the process.
If you don’t have any special tools at hand, you can use a core and a hammer. To do this, the first one should be positioned at an angle of forty-five degrees and hit with a hammer, but only counterclockwise.
If you cannot unscrew the element, you will need to drill a larger hole and re-tap the thread.

How to unscrew a broken nut

In order to implement your plans, you need to knowhow to unscrew a nut with broken edges. Although it's not easy, you can use a few tips from the experts:

You will need a metal brush to clean the jammed joint. A small amount of kerosene or diesel fuel should be dropped into this place and wait twenty minutes. After this, using a spanner, unscrew the nut.
You can tap the nut, but do not use too much force.
Using a gas wrench, as it has a stronger clamp and can be used to unscrew even round objects.
An angle grinder, which is used to cut new edges, will cope well with this problem.
At home, they often use a chisel and a hammer, with which they cut the non-working nut and then unscrew it.

All the methods described above for removing a rusted, deformed or stuck bolt will be within the capabilities of any owner. And the listed tools and equipment can be purchased at any hardware store. It is important that you do not use too much effort during disassembly; it is better to understand the cause of the problem and eliminate it.

Surprises are inevitable during renovations. Equipment can fail, a seemingly strong part can break in the most unnecessary place, and bolts and nuts can resist unscrewing. And then the repair drags on, taking extra time, nerves and money.

Nowadays you can find many videos on the Internet with guidance on how to carry out any repair work. They say that based on videos from the Internet, you can build a house from scratch and reassemble a car, piece by piece.

But with such a huge number of tips and recommendations, it is difficult to choose the right course of action for you. In this article we will try to collect all available experience and systematize it for ease of use.

Bolt with torn edges

Now we'll figure it out how to unscrew a bolt with torn edges. As a rule, the reasons for this problem lie in the following:

The parts held by the bolt were misaligned in an unnatural way. This leads to pinching and damage.
The bolt itself was very tight when tightening.
The tool used to tighten it was the wrong size and improvised means were used (screwdrivers or chisels are often placed in keys bigger size in the absence of suitable small ones).

Before unscrewing a broken bolt or nut, you need to do some preparation. This will allow you to spend less time and effort, and sometimes save expensive equipment.

Sequencing

However, it often happens that it is the screw that jams that cannot be reached with a torch or tapping tool. In that difficult case should be a grinder or any available tool such as a chisel make a deep cut on the preserved cap. This will become the hook that will allow you to pull out the entire bolt.

Now you can, clinging to this protrusion, try to unscrew the stubborn screw. Press the screwdriver into the recess, and while lightly hitting the handle of the hammer in the direction of unscrewing (not clockwise), slowly turn the bolt.

Hex bolt

The edges of the axis are convenient for both tightening and unscrewing. Clear and even, they provide a reliable support for the key. If the bolt is suitable for your hand and of the appropriate size, at first you can comfortably twist it by hand, later tightening it with the help of a tool. However, there are often cases when, due to excessive use of the screw itself, or heavy loads on the connection, the edges are torn off and the fastener remains sticking out in the joint. It is uncomfortable to handle; it slips out of your hands and tools. Let's look at several options for solving this problem, with corresponding solutions.

A screw with a hexagon hole can be unscrewed in the following way:

You need to take a file and make it the size for a hex key. By making such a cut, you will save significantly, since you will be able to use this fastener more than once in the future.
Make a notch on the cap with a grinder or any other in a convenient way, for example, a hacksaw for metal. And use a flat-head screwdriver, resting on its handle as if it were a rotation arm.
You can also use one of the appropriately sized TORX sprockets to unscrew the screw.

For connecting rod bolts made of steel, there are only two methods:

Star bolt

You can unscrew such a bolt in the same way as unscrewing a nut with torn edges. We discussed the main methods of unscrewing stubborn bolts and nuts in great detail earlier, and now we can summarize all the methods that are suitable for such a screw. So, if the edges of your star bolt are torn off:

The easiest way is to use an extractor. This proven product will not let you down this time either. Make a hole in the fastener leg, fix a suitable extractor there and carefully unscrew the stuck bolt with careful movements. As we can see from this article, a set of extractors of various diameters is a really necessary thing on the farm if you regularly engage in such assemblies and disassemblies.
Use the gas wrench. This adjustable wrench will tighten the bolt tightly, and you can remove it with a few turns. This method is good because you don’t need to buy a separate tool. There is a similar wrench in almost every home.
Focus on the bolt head. If there is enough space around the bolt, make a notch on its head with a grinder or a hacksaw. You can rest a screwdriver or chisel against this notch and turn the bolt by hitting its free end with a hammer or other tool convenient for you.

We have looked at options for releasing bolts and nuts that are available for use by anyone home handyman. Of course, methods used in professional workshops or car repair shops were left out of the discussion. However, they constantly use equipment that you might only need once or twice at home. And it costs a lot of money. Professionals use to release bolts with torn edges:

Impact wrench.
Hairpin driver.
Specialized extractors.

However, if such situations arise for you no more than once a year, then it makes little sense to purchase special tools No.

Good advice and useful trick How to shorten a bolt, stud or screw. The point is that if you cut the thread in the usual way, then it will no longer be possible to screw the nut back onto the threads. All this happens due to the fact that the threaded turns are wrinkled.

There is a simple way out to avoid this.

Will need

A bolt, stud or screw that needs to be cut and shortened.
Nut, 1-2 pcs., with the same thread.

Cutting a bolt, stud or screw correctly

So I'll take a screw as an example. Use a marker to mark the place for the cut. We measure with a ruler.

Screw 1-2 nuts onto the bolt beyond the mark. In general, the nuts should be on the side that you will need later.

Now let's cut it off. Depending on the thickness, this can be done in several ways:

Bite off with nippers.
Cut with a grinder.
Saw off with a hacksaw.
Clamp it into a screwdriver and rotate the bolt and cut it off with a hacksaw.
Or another way.

It's not important for you to choose.

I bit it off with wire cutters because the screw is thin. Of course, this is the crudest method, but it is fast.

Now hold the nut with pliers and use a screwdriver to remove the screw. This is the trick: after unscrewing, the nut will straighten all the threads at the tip of the cut.

It is better to screw on two nuts; they will better correct the entire thread.

Now, you can easily screw nuts onto this cut screw.
This is how you can easily preserve all the working properties of a bolt, stud or screw after cutting.

Among detachable connections, threaded ones take first place both in terms of prevalence and reliability. However, in practice there are many cases when it is not easy to unscrew a threaded pair.

Reasons why it is not possible to unscrew a stuck nut (bolt).

There are several reasons why disassembling this simple connection may be difficult or even impossible:

deformation of the thread or connection parts, for example, due to a strong impact;
screwing not according to the thread with the application of significant force - in this case, friction between the surfaces of the parts increases significantly (the effect can be aggravated due to the influence of external factors);
oxidation of the surfaces of connection parts, formation of a layer of rust on them;
diffusion of materials between joint parts.

The last two reasons are well known to almost everyone, especially motorists.

The problem is that studs, bolts and nuts are most often made of carbon steel. With prolonged contact with water and atmospheric oxygen (for example, wheel bolts are constantly exposed to this effect), these substances penetrate into the smallest gaps, including between the parts of the threaded connection. As a result, the iron oxidizes and a layer of rust forms, which increases friction. It will take a huge amount of force to move the parts out of place (often the magnitude exceeds the strength of the bolt, and it collapses).

Designers try to prevent such troubles by using parts with protective coatings or made of stainless steels. But this doesn’t always work. If the bolt and nut are exposed to heat (an example would be parts on a muffler) protective coatings may be disrupted, corrosion processes accelerate.

There is also a process of diffusion (mutual penetration) of materials; the parts form a monolith, which becomes difficult to disassemble (those who try to unscrew a bolt on the crankshaft often encounter this phenomenon).

How to unscrew a stuck bolt (nut) - basic methods.

To cope with this task, several methods are used. They can be roughly divided into

mechanical;
physical;
chemical.

Mechanical methods.

These include methods that allow you to disassemble a threaded connection by applying mechanical forces:

the use of ring wrenches and socket heads instead of open-end wrenches;
using leverage to increase effort;
impact with variable direction of force;
accentuated impact (short-term application of significant force or forces at certain points);
impact destruction of layers of oxides and rust.

An open-end wrench covers only three edges of the nut or bolt head. In addition, there remains some gap between it and the edges. In this case, applying sufficient force to unscrew it may be a problem - the key may break off and “lick” the edges. A spanner or socket spans all edges, allowing greater force to be applied.

To increase the force, you can use a lever to increase the length of the handle. In this case, there remains a danger of licking the edges or destroying the fastening parts. You can also damage those parts that were connected by a threaded pair.

Often, changing the direction helps to unscrew a stuck or rusted nut - before unscrewing the connection, try to screw it in. The impact of forces alternately in different directions destroys the layers of rust, allowing the connection parts to move.

An example of the application of significant force for a short time is provided by the method using a chisel and hammer. They make a notch on the edge, place a chisel against it (directing it as the nut is unscrewed) and hit it with a hammer. In this case, the impact force is much greater than what can be applied using a wrench. Since the impact is short-term, it cannot destroy the bolt.

For your information! This method can also be used to unscrew a nut with torn edges. This is somewhat easier than trying to cut new ones to fit a smaller key size.

Lightly tapping a nut and/or bolt with a hammer causes the entire structure to shake and destroy the rust layer. You only have to dose the impact force so as not to damage the parts or deform the thread. Although one of the methods for disassembling a “recalcitrant” connection is destroying the nut with such blows. The only problem is that the threaded pair will have to be changed.

Physical methods.

Some of them are based on physical properties metals Of these, only one is widely used - heating the connection parts. At the same time, the material of the nut expands, the gap between it and the bolt increases, and it becomes easier to unscrew it. If you heat up the entire structure, you can destroy the rust that has formed, which will also give a positive result. For this purpose, you should use any heat source - a powerful soldering iron, a hair dryer, blowtorch or other open flame sources.

Important! Using an open flame near wood, flammable plastic or flammable liquids is dangerous!

Electric heating is a good replacement for open fire. For this, a transformer (factory or homemade) with a secondary winding with a voltage of 1.1 - 1.5 V and maximum current is suitable. Through copper cables and clamps, the secondary winding is connected to a bolt that must be unscrewed. Warming up occurs, after which the transformer is turned off and the connection is dismantled.

Other physical methods use the method of wetting surfaces to reduce friction. For example, if you allow liquid to penetrate the space between a bolt and a nut through the smallest channels, the friction between the threads will decrease and the pair will become easier to disassemble.

Of the easily penetrating liquids, you can use those that are always at hand for the motorist:

brake fluid;
antifreeze;
kerosene;
gasoline;
diesel fuel.

The first two contain glycols and ethers - substances with enormous penetrating power. The rest are aliphatic hydrocarbons and have a similar effect.

The second group also includes solvents such as white sprit and turpentine. All of them can be used to unscrew a stuck nut. The processes differ somewhat only in time.

The method is simple - wet a rag and place it on the stuck parts. Penetrating into the gaps and pores, liquids lubricate surfaces and loosen layers of rust. After some time (from half an hour to 3-4 hours), you can try to unwind the connection. If disassembly fails, repeat the process. You can speed it up by periodically light tapping.

These same liquids are the basis for “liquid keys” - lubricants special staff, which are offered in car dealerships.

One of the most popular among car enthusiasts is WD-40, which contains mineral oil, white spirit and gasoline of highly volatile fractions. The effectiveness of this “cocktail” has been tested in practice; it can remove rusted nuts in half an hour.

For your information! If the nut becomes stuck not due to water contact, but under the influence of temperatures, the effectiveness of WD-40 is significantly reduced.

Chemical methods.

Their action is based on the chemical destruction of rust formed between the connection parts. To do this, it is necessary that active chemicals get into the gaps between the bolt and nut.

Used for such processing threaded connections almost any acids:

sulfur;
salt;
vinegar;
lemon;
orthophosphorus, etc.

Sulfuric acid for battery electrolyte or hydrochloric acid for soldering radiators use this way:

a rim is arranged around the nut or bolt head made of plasticine;
A few drops of acid are added inside the resulting “container”;
a piece of zinc activates the process, creating a galvanic couple.

A day after the start of such treatment, any connection unwinds.

Weaker acids are less effective and require either a significant amount or more time.

For your information! Phosphoric acid is found in drinks such as Coca-Cola. That is why you can try to unscrew the nut with their help. But its concentration is low, the acid itself has low activity, so this treatment is effective only in “mild” cases.