TOP 12 ways to unscrew a broken bolt or stud

In the process of repairing and servicing a car, as well as any other equipment, there is often an urgent need to remove individual elements of the internal combustion engine or chassis, body panels, etc. At the same time, removing engine components, attachments and suspension is often the most problematic operation. The reason is that the units can be tightened with bolts or studs, and the tightening torque is quite large.

If we add to this temperature changes in the engine compartment, oiling, accumulation of dust, dirt and other deposits, it becomes clear that unscrewing various bolts and other fasteners is not only a responsible and time-consuming, but also often a difficult task. In this article we will talk about what you can do if a stud or bolt breaks, as well as how to unscrew a broken bolt.

Effective ways to deal with broken bolts and studs

Professional locksmiths know several effective methods on how to unscrew a broken pin. Before you start this task, you need to prepare. By these works we mean cleaning the surface from dirt and grease. It is recommended to pre-treat the threaded connection with WD-40 or ordinary machine oil. You can also ease the situation by hitting the piece of wood with a hammer several times. Often the problem is solved by heating - a pin or bolt, provided that it looks out of the hole, is heated with a soldering iron. Then it can be removed relatively easily.

Replacing the stud

Experienced craftsmen recommend unscrewing and changing all the studs at the same time. Parts from the same batch have similar physical and mechanical characteristics, will bear loads evenly and will last much longer.

Before unscrewing, thoroughly moisten the thread with WD 40 or kerosene. In extreme cases, brake fluid will do. If you don’t have a special puller at hand, you can unscrew it with a gas wrench. You need to pull smoothly, without jerking. If you can’t unscrew it right away, you should apply WD 40 again and wait 5-10 minutes.

After all connections have been unscrewed, they should be replaced with a new set. The threads can be lubricated with graphite lubricant - this will help you easily unscrew the parts if necessary. Next, you should install the cylinder head in place and begin tightening the nuts according to the diagram from the user manual.

Replacing the stud

First, all nuts are tightened to light resistance.
Using a wrench and a dynamometer, achieve the specified tightening force value.
In the sequence described in the manual, all nuts are finally tightened.

The nuts can also be lubricated with graphite grease.

It is generally accepted that

...a self-tapping screw is the same screw, but only in a modern version. In the old days, almost all fastenings were made using screws. To do this, you had to drill a hole and then screw a screw into it. Unlike screw fastening, self-tapping screws do not require additional preparation that will involve drilling a hole. They can be screwed using a screwdriver or even a regular screwdriver into any suitable surface.

According to external data, the differences between these two fastening elements are small. Screws in the upper part under the head have a smooth part of the shaft that does not have threads, but self-tapping screws have threads throughout the entire shaft up to the head

Ignorant people may not even immediately pay attention to such features, and will not even find the differences. In construction markets, small self-tapping screws are sold by weight, but large samples are sold individually. https://www.youtube.com/embed/qfVy_fC-qqg

Features and advantages of cylinder head studs

In any engine, the cylinder head (cylinder head) is attached to the block itself with studs. They are screwed into the block in such a way as to ensure the best and uniform pressing of the cylinder head to the block. A high-quality compressed gasket prevents the leakage of oil and antifreeze and the penetration of gases from the cylinder into the engine crankcase. Fasteners are made from high quality steel. However, over time, the threads on them may corrode and become clogged with various contaminants. Due to exposure to high temperatures, these contaminants are sintered, and the nut “sticks.” When you try to unscrew such a stuck nut and exceed the maximum force, either the thread breaks off or the fastener breaks off. In both cases, it is necessary to replace the broken part.

Cylinder head studs

Conclusion

In any case, a bolt breaking in the most inopportune place is a rather unpleasant and unusual situation. It is best to have an experienced specialist remove the remaining part. Otherwise, you can completely ruin an expensive part, which will lead to unexpected expenses.

For clarity, how to drill a bolt without damaging the thread, you can watch the video here:

Threaded connections are the most widely used among detachable connections. They come in a variety of sizes; screws, bolts and nuts are found in both a smartphone and a nuclear reactor. Each connection must be tightened with proper torque. Sometimes the threads become clogged with dirt or become a victim of corrosion. When you try to unscrew the connection, the maximum force is exceeded and the thread breaks. It even reaches the point of destruction of the fastener body. In order to remove a damaged pin from the body, various techniques are used.

How to unscrew a hairpin by its smooth cylindrical part

If only the smooth part of the stud is accessible (for example, the threaded part is broken), then the following techniques are applicable;

clamp the cylindrical part in a suitable tool (pliers, a pipe wrench, a small vice, a clamp, or the like) and apply force in the direction of unscrewing;
weld a metal rod to the broken end by welding as a T-shaped handle;
put on a nut of a slightly larger diameter, weld it to the stud in a circle and unscrew it with a wrench;
use a square washer as thick as a nut or more, with an internal diameter the same size as the diameter of the cylindrical part of the stud (ideally, if the washer fits on the cylindrical part of the stud with interference), cut it on one side in the same way as the nut in the previous subsection, put it on the stud, clamp pipe wrench and unscrew;
use a die (the one used for cutting threads), turning the end of the pin to a square of the desired size;
use a pin driver;
Using a hacksaw for metal, make a cut at the end for a flat screwdriver, with which you can remove the pin.

In some cases, if possible, to enhance the impact, simultaneously with applying force to a screwdriver or wrench, you can use a second tool (pipe wrench, pliers, etc.), clamping them on the smooth side surface and acting in the direction of unscrewing.

Cononic

How to unscrew a bolt with torn edges: methods of unscrewing.
It is equipped with a left-hand conical thread. When screwed into a hole drilled in a broken pin, sooner or later it gets jammed in it and then turns the pin out.

The tool is made of hardened chrome vanadium steel. They are supplied individually or in sets for the most common thread sizes. Each manufacturer indicates what thread size (stud diameter) each model corresponds to. If such information is missing, it can be found in the company catalog. If this was not possible, then you can use the table of approximate correspondence between the diameter of the cylindrical part of the conical extractor and the thread rating of the broken pin.

Diameter	Thread
From	Before
3,2	4,0	M3 - M6
4,0	5,5	M6 - M8
5,5	7,0	M8 - M11
7,0	9,5	M11 - M14
9,5	13	M14 - M18
13	17	M18 - M24
17	21	M24 - M33
21	25	M33 - M50

The most common type of tapered removal tool shown is one with relatively fine threads. There are other types of conical models that differ slightly in performance properties.

What are extractors used for and what fasteners can be unscrewed with them?

The design of extractors is described in detail, but for what purposes can such cutting attachments be used? The devices in question are used for unscrewing any types of fastening connections - aluminum, steel, plastic, hardened and other types of bolts, self-tapping screws. It is very difficult to drill a hole in a hardened bolt, so to make the work easier, you should heat it and temper the metal.

Extractors are used to remove broken bolts from the following parts:

From a car engine block - and this applies not only to outdated car brands, but also to modern foreign cars. When assembling a vehicle, defective parts are encountered, which are identified directly by the vehicle owners. When dismantling the engine block, a set of extractors will help you unscrew a bolt with a torn head.
From the car hub - not all car models use nuts to tighten wheels, but also bolts. When tightening or unscrewing the bolts that secure the wheel, the cap can be torn off. This unpleasant situation can be solved by using extractors, without the need to replace the hub
From the valve cover. Often the bolts remain in the valve covers and cylinder head, which can be removed using a set of extractors. Car owners are advised to acquire such an indispensable tool as extractors for unscrewing broken bolts
From a concrete wall. You've probably encountered a situation where, when screwing a self-tapping screw or mounting bolt into a wall, it becomes deformed. Such malfunctions can be solved simply by using an appropriately sized extractor.
Ignition switch in a car - when it becomes necessary to replace the ignition switch on a car along with the mounting frame in which it is installed, this is problematic. The steel frame of the ignition switch is secured with special disposable bolts (vandal-proof). To unscrew them, you will need to use extractors.
Damage to the spark plug - when unscrewing, this part on the car can be damaged. Such cases, although rare, are quite appropriate. To unscrew the remainder of the broken spark plug, you should use an extractor. The task is complicated by the design of the engine, since on most modern cars the spark plugs are located in the shafts
Small bolts - often when repairing phones, laptops and tablets, a problem arises when one of the remaining screws refuses to unscrew. It is impossible to find such a small extractor, since they are not produced. There are several current methods to solve the problem. The first is to use a thin drill bit. A through hole is drilled in the screw, after which the fastener can be removed. The second is to glue the screwdriver blade with epoxy glue, after which hardens, unscrew the fastener. In this case, it is imperative to use high-quality resin glue

Depending on the size of the fastening joints, it is necessary to select extractors of appropriate diameters. The price of extractors is affordable for everyone, but those who like to save money need to be careful, as cheap Chinese analogues are of unsatisfactory quality. Already the first time they are used, the threaded edges are licked off. The situation is even worse when part of the nozzle remains in the drilled hole of the remaining part of the bolt. In this case, the ability to unscrew the rest of the bolt becomes more difficult.

Method 7 – special extractor heads for licked edges

Special heads - extractors - are available for sale. They are precisely designed for unscrewing torn bolts with licked edges.

But such heads have their own peculiarity of use - they cannot be unscrewed using an impact tool, but only with a key with a 3/8-inch square.

The algorithm of actions is very simple. An extractor head of a suitable size is taken from the kit and, using a hammer, is pressed onto the licked head of the bolt so that it fits onto it.

Next, take a 3/8-inch square wrench, a lever, and unscrew the bolt.

Many people ask whether it is necessary to change the gasket if it was not possible to remove the cylinder head due to one broken bolt.

Most experts say that yes, it needs to be changed. After all, if all the bolts were torn off except for one, then the first clamping of the gasket was broken, and the second time it may not seat correctly and subsequently leak or burn out. Therefore, if you have already taken up the task, then bring it to the end. And we told you how to do this above.

How to unscrew a stuck hairpin: step-by-step life hack

There are a number of subtleties that are important to consider when unscrewing a rusty stud from a block. Take step-by-step instructions on how to unscrew a deformed hairpin: the main rule is to maintain the integrity of the thread

First, let's try to use a hammer to strike along the axis of the stud; we knock out the side parts of the stud. To avoid damaging the stud, screw the nut on one side; fill the part with a penetrating chemical solution. For example, a liquid key can make it easier to unscrew a pin from a hole. It reduces contact between the part and the hole; if you are using a hand tool to drill, increase the force applied. This can be achieved by screwing on an elongated wrench; to simplify the task, use a wrench; if the stud does not want to be unscrewed for a long time, try to reduce the contact between the elements by heating and cooling several times

the main rule is to maintain the integrity of the thread. First, let's try to use a hammer to strike along the axis of the stud; we knock out the side parts of the stud. To avoid damaging the stud, screw the nut on one side; fill the part with a penetrating chemical solution. For example, a liquid key can make it easier to unscrew a pin from a hole. It reduces contact between the part and the hole; if you are using a hand tool to drill, increase the force applied. This can be achieved by screwing on an elongated wrench; to simplify the task, use a wrench; if the stud does not want to come out for a long time, try to reduce the contact between the elements by several heating and cooling.

When pulling out a stud, it is wise to use durable tools

It is important to prevent the edges of the stud from being licked off.

The most typical failure situations

A bolt can break in different ways. The easiest case is when it breaks flush with the part. In this case, there will be no special problems in how to drill the bolt. But, nevertheless, it will be necessary to carry out some preparatory measures that will allow you to extract the remaining part without much difficulty. And they are as follows:

The most important thing is to prepare yourself for the fact that you can only drill out a broken bolt without damaging the thread if you apply maximum patience and calm. Haste in this case is the main enemy
First of all, you need to use a tool to quickly unscrew rusty bolted joints. There are a great many of them in the markets. But the overwhelming majority of such funds are absolutely useless. A self-respecting car enthusiast and mechanic should always have in stock a penetrating agent for loosening nuts and bolts, which contains substances that have the ability to penetrate any joint. Recommendations for choosing can be obtained from any well-known car service center. The most effective lubricants are those based on molybdenum disulfide and graphite.
Next, you can try one of the simplest options on how to drill out a broken bolt without any problems. To do this, you need to use a thin drill and a low-speed drill to drill a slot for a screwdriver.
You can purchase a gas torch for loosening bolts at any hardware store. If there is such a burner, then with its help it is necessary to slightly warm up the part itself in such a way that the remaining piece does not heat up. In this case, there should be a fire extinguisher nearby.
Then try using a screwdriver with a wrench to slowly loosen the rest of the bolt. If the bolted connection is not old, then the piece should come off.

Features and advantages of cylinder head studs

Cylinder head studs

Flat head screwdriver and hammer

An accessible method, effective if the fracture occurs above the thread and the surface has an uneven edge. Then for extraction you will need a simple set of tools, which can be found in any garage.

We carefully examine the cleaned surface and find the largest protrusion on the fracture area. We place a flat-head screwdriver at an angle, pressing into the selected location. For more reliable support, you can use a core, with which the unevenness deepens. After this, using gentle blows, we carefully try to turn the thread. If you can’t do this right away, you need to gradually increase the strength.

However, you should be extremely careful with this method, since, firstly, the surface must be accessible enough for the hammer to work. And secondly, you need to carefully calculate the force of the impact to prevent damage to adjacent parts.

How to unscrew a broken stud or bolt?

Many people have encountered the problem of studs and bolts sticking and then breaking off. This can happen in any part of the car, but mainly occurs on exhaust manifolds, turbines, and cylinder head. This happens due to the difference in materials and their oxidation, corrosion, in particular steel versus aluminum. Different temperature conditions leading to deformation of threads and changes in the size of parts.

And almost always the studs and bolts, when stuck at the thread, break flush. Due to the fact that the stuck threaded part stands still, and the rest of the body of the bolt or stud experiences heavy torsional loads. Especially if the bolts are on thermally loaded components. Over time, the metal hardens from constant temperature changes and becomes brittle, losing elasticity, but at the same time hardening.

Several methods of removal have been invented for such “bummers”:

It happens that hardware does not break immediately when a load is applied to it, but when it begins to twist. Thus, the broken part can remain quite deep in the thread. In this case, you can go through the rest of the fragment with a drill (after thoroughly leveling the surface of the fracture and tapping its remainder so that the drill does not fidget) and correct the thread with a tap. Or use drills with the drilling direction opposite to the direction of the crease thread.

And then, as you drill in the opposite direction, the hole seems to begin to unscrew, plus the appearance of a slight temperature effect helps ensure that the fragment can be safely removed.

Another popular method is to use extractors,

which also requires pre-drilling. And then use the extractor.

But there are nuances here that can only make the situation worse. For example, a drill bit can break while drilling and remain in pieces, creating double problems. Using an extractor can also aggravate the situation in the form of breaking off the stuck part of the bolt, or breaking off the extractor itself.

Also, if the fragment is heavily hardened, drilling can be labor-intensive. And you need good drills, and don’t forget about intermediate cooling of the drill. If the fragment sits very tightly, then it will not be possible to get it out in this way.

2. Impact twisting.

For this method, sharpened files, valves, and taps are usually used. Or a tool: hexagons, ray-shaped torxes. If the edges are on the bolt head, then a smaller tool head is stuffed onto it.

Thus, a suitable workpiece is drilled into the fragment and hammered into it, and they try to unscrew it. If the fragment is harder than the workpiece, then it, like the drill, can break off. True, in this case it will be easier to remove a piece of workpiece than a piece of a drill.

If the piece of a pin or bolt is softer than the workpiece and sits firmly enough, then the workpiece will most likely turn in the piece. And you won’t be able to turn it out this way.

Chisels are also used. To unscrew, tapping on the crease or on the nut through a chisel standing perpendicular (more suitable for nuts). But if the fragment is flush or deeper, this method does not work.

3. Use of welding.

The most effective method, combining serious heating and subsequent tempering, which already contributes to the release of the thread. It also makes it possible to weld various nuts and bolts to the crease for putting heads, knobs and keys on them.

Here, too, there are several ways to perform twisting. You can immediately weld the nut onto the fragment, but the distance between the top of the nut and the fragment, unless the fragment is sticking out, does not always contribute to good welding. And when unscrewing, the weld can be cut off from the fragment. You can first weld filler metal onto the piece, then put a nut on it and weld it properly, or weld a bolt to such a protrusion. But this method can also end in a cut.

Source

Drilling

And finally, the third and most radical way. It is used to remove broken bolts and studs from the hole. This is drilling. The method is very difficult. It is much more complex than all of the above and is the most dangerous. There is a risk of damaging the threads in the bore of the engine block or cylinder head. The drill should be held securely, as if it is a cylinder block, there is a serious risk of damaging an expensive part. The stud is often made of harder grades of steel, and the head is made of aluminum. The commutator body is cast iron, so it is also softer than a steel stud. The drill will definitely move away from the hard stud and towards the softer metal. This happens especially often if the work is carried out in a confined space and the drill is installed at a slight angle. The principle of drilling is as follows: you need to make a hole strictly in the center of the stud with a thin drill, having previously cored it, then install a thicker one in the drill and repeat the entire procedure.

The main thing here is to drill strictly in the center. When practically nothing remains of the stud body, the wall will become thin. It can be broken. You should very carefully break off the remaining pins using pre-sharpened wire or tweezers. It must be remembered that any action is carried out as slowly and carefully as possible. If you act rashly, you will need to think not about how to unscrew the broken block stud, but also about how to restore the cylinder head itself. And these are significant costs.

Method 3 - welding on the nut or head

Of course, not everyone is good at welding, but you can ask a friend. The essence of the method is to weld a nut onto the problem bolt and then unscrew it.

But, in most cases, this nut also breaks off, so many experts recommend welding a head instead, preferably an already broken one, so that it won’t be so bad.

The head is higher and you can insert a key with a large lever into it;
It is more convenient to scald, the scalding area will be larger, which means the head will hold tighter.

The ideal option is to use a semi-automatic device; for a conventional inverter, a 2 mm electrode is used.

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After welding, wait until the metal cools down. Then insert a wrench with a large lever into the head and begin to unscrew the bolt.

How to unscrew a broken hairpin

If the pin is broken and there is no part protruding above the surface, then you can unscrew it in the following ways:

using a semi-automatic welding machine, gradually and carefully “build up” a couple of centimeters (if the end of the stud is within the reach of the welding wire) and then unscrew the “build up” using a clamping tool;
use a special tool - an extractor (looks like a tap, the working part is conical, the thread direction is opposite to the thread of the stud): align the protruding end of the stud with a file (or saw off evenly with a hacksaw), tap exactly in the center, drill a hole of the required diameter along the axis of the stud and depth (approximately 2/3 of the length of the working part of the extractor), insert the extractor and rotate with force until the pin is unscrewed;
preparation with drilling as in the previous method, only use a tap on the left thread of the stud (if the stud is in the right direction) - when the tap, cutting the thread, rests on the bottom of the drilled recess in the body of the stud, the fragment is often unscrewed;
drill out the center of the stud, choosing the diameter in such a way as not to touch the threaded part of the socket, and then remove the remaining metal of the stud;
Drill out the broken part of the stud and the threaded socket on a drilling machine or with a hand drill with a drill of a larger diameter for the repair stud.

Using the method of drilling a recess and driving a Torx tip into it carries the risk of strengthening the wedge in the threaded socket due to the expanding deformation of the stud walls. Taking into account possible complications, we will not recommend it in this situation, despite the fact that it can be used in a limited manner, with certain conditions.

Aligning the end of the stud can cause difficulty if the breakage occurs in depth. In this case, an end burr will provide invaluable help.

Another variation for the drilling method. You can use drills with a left-hand direction of rotation and an electric drill with a direction switch and speed control. When drilling at low speeds, the wedged threads loosen and, due to the left rotation of the drill, the rest of the stud easily moves out of place and comes out of the threaded socket.

Drilling is often wiser to do in several passes, from a small drill to larger ones, to the desired diameter.

Combined

It combines a drill and the extractor itself. However, for its application it definitely requires a reversible drill with a variable speed (from 350 to 800 rpm).

This model consists of two parts: a bushing and a drill screwed into it. Drill - left rotation. On its middle part there is a thread cut into which the bushing is screwed. The bushing has a tapered left-hand thread, like the tapered model previously described. In its upper part there is a hexagonal profile for using an open-end wrench or a spanner wrench.

How to drill out a broken bolt using a combination model? Drilling out broken bolts and removing studs using this model involves four steps.

Drilling. Left rotation of the drill is used. Before drilling begins, the threaded bushing is “driven” back, where it rotates freely together with the drill;
By rotating the drill in the forward (right) direction, the sleeve is “driven” down along the drill. In this case, the sleeve is held by the hexagonal profile;
Using a hexagonal profile, the bushing is initially screwed into the hole in the broken pin;
The drill switches to left rotation, and the sleeve is screwed into the hole until it jams. Continuing rotation causes the pin to turn out.

How to unscrew a broken bolt without damaging the thread in the hole :: SYL.ru

Quite often, when using fasteners such as a bolt, situations arise when the head of the product breaks off, and the hardware itself remains inside. In this case, it becomes necessary to remove this residue without damaging the threads, so that the hole can continue to be used. Considering this, the topic of how to unscrew a broken bolt is very popular and requires more detailed consideration.

Types of fractures

Typically, such fasteners break at the end of the thread, although there may be exceptions. As a result, the hardware itself can be recessed into the hole, protrude above the surface, or be level with it

Based on this, you need to decide how to unscrew a broken bolt by paying attention to this very moment

Surface cliff

This type of failure includes the option when part of the hardware protrudes above the surface. We can assume that such a problem is easiest to solve without using radical measures. However, before any unscrewing of the broken bolt, it is worth treating the area with kerosene to remove carbon deposits and loosen the contact of the surfaces.

If the protrusion is quite large, then the easiest way is to use tools such as pliers, pliers or a clamp, with which you can grab the part and unscrew it along the threads.
Some experts, answering the question of what to do if a bolt that fits very tightly in the hole breaks, recommend using a welding machine. With its help, you can weld a lever to the hardware, which will result in a large arm for rotational movement.
You can also use a drill with a diameter slightly smaller than the bolt itself. Using a drill, make a hole along the central axis of the bolt to the full depth. After this, the remaining fasteners are removed using a hook, trying to unscrew the thread from the very bottom.

Flush break

It is believed that this breakdown is the most difficult, since sometimes it is very difficult to determine the diameter of the hole, especially if the fastener has been cut off. Therefore, in order to determine how to drill out a broken bolt of this type, you should first clean the surface, determining the gaps.

Quite often, the break point has very uneven shapes, which, given this arrangement, are very difficult to straighten. It will not be possible to drill the product in this state. That is why a core is first used to prepare a place in the center for working with a drill.

Further steps describing how to drill out a broken bolt are described in the paragraph on surface breakage. After making the hole, the remaining threads are simply removed with a hook.

Cliff below the surface

Such damage is quite complex, especially if the part itself is made of soft metal. Therefore, you need to solve the problem of how to unscrew a broken bolt without damaging the threads in the hole.

First of all, using a core, mark the center of the hardware. In this case, it is best to use a thin tool made of durable metal so as not to accidentally damage the part.

The next step is to purchase a tap with reverse thread. Its diameter should be smaller than that of the bolt itself.

After this, a hole for the tap is drilled in the hardware itself, but not deepened too much. Next, it is enough to install the thread cutting tool and turn it as you go, which will lead to unscrewing. If this does not happen, then the tool is used as a regular bolt, but you should not apply too much force so as not to break it.

Extractor

The most correct answer to the question of how to unscrew a broken bolt is considered to be the one that suggests using a tool specially created for this purpose. It is called an extractor and is sold as a set of products of different diameters. Outwardly, it resembles a tap, but without longitudinal slots and with a conical notch for cutting.

To use the extractor, it is enough to drill a hole in the center with a diameter that allows the tool to go several turns. Then they begin to turn it all the way, and then until it is completely unscrewed.

Conclusion

There are several options for removing broken bolts from a hole that can be used for certain types of damage. However, it is best to purchase a set of extractors in advance, which can be considered the best tools for such tasks.

Chemical

Now we will consider methods for those who do not rely on the help of physics, but want to solve the problem with the help of chemistry. Your laboratory should have: kerosene, white spirit, acidified sulfuric acid, zinc, plasticine, hammer, water, sandpaper, wrench, chisel.

Attributes of the chemical method for unscrewing the nut

We moisten the nut and bolt with kerosene (experienced people recommend making a mixture of White Spirit and kerosene), applying a swab to them, it doesn’t matter whether it’s cotton or gauze. After some time - from an hour to a day, and with repeated attempts, you may find that the hub nut can be easily unscrewed. But even here you cannot do without force: at a minimum, you will probably have to work with sandpaper to clean the parts from rust. If even after this things don’t work, you should help with a hammer: tap it on the edges of the hub nut.

If in this case you are not successful, make a small container out of plasticine, secure the hub nut on top, pour water with sulfuric acid into it, and put zinc in the container. A chemical reaction begins that does a very good job of removing rust. Usually a day is enough for even advanced corrosion to go away from a part. Finish the job with a wrench. But this method is valid only in the case when the reason is that the nut is tightly stuck and/or rusted, and if it was simply tightened, neglecting the required tightening torque (to “be sure”), then you just need to tighten it.

What is the result..

As you can see, unscrewing the hub nut is not an easy task, but it can be solved

Please note that the first step is to try to preserve the hub nut by using penetrating fluids such as Vedeshka. Physical efforts to twist the hub should be moderate

And, of course, you should refrain from strong blows and heating with a torch, as methods that can render not only the nut, but also the bearing unusable.

Due to the lack of the required number of guarded parking lots, car owners install not only alarms on their cars, but also secret bolts on the wheels. Fastening elements with non-standard head shapes are called “secret”. They cannot be unscrewed with a balloon tool; fastening can only be done with the special tool that comes with the kit.

How to unscrew the remaining fragment

If the pin does break off, don’t despair. To unscrew the broken part, several techniques are used. Some require the use of industrial equipment, while for others, simple equipment available to a home craftsman is sufficient.

How to unscrew a broken hairpin

If a fragment remains sticking out, then use one of the following techniques:

Put on a nut with a slightly larger diameter and weld it. Next, you can use a key to unscrew the broken pin.
Weld a transverse rod (reinforcement) 30-40 cm long. Using it as a wrench, you can unscrew the fragment.
Use a file to sharpen the top to a square. Now the fragment can be unscrewed with a tap wrench.

Unscrewing a broken pin

If the breakdown occurs flush with the surface of the cylinder head (or other unit), the fragment will have to be drilled out.

Drilling out the threads of a broken stud

Before drilling, cover the cylinder head with a thick cloth to prevent sparks and waste from entering the cylinders.

Next, you need to use an angle grinder with an abrasive disc to level the surface of the fragment. It should become strictly horizontal. A point is marked in the middle.

Next, take a drill with a diameter slightly smaller than the internal diameter of the thread. It is best to place the cylinder head on the workbench of a stationary drilling machine - this way there is less risk of the drill deviating from the vertical.

Drilling out the threads of a broken stud

After passing the hole to its full depth, you should unscrew the remains of the drilled fragment from it using pliers or needle-nose pliers. Next, you must go through the hole with a set of standard taps.

Safety regulations

In fact, unscrewing a broken thread is quite a dangerous activity. Since the hole can be not only through, but also difficult to access.

Let's study the basic rules that need to be followed:

Protect the skin of your hands and face - substances such as solvents, for example, contain many chemical elements. When mixed, they release substances that, upon close contact, can settle on the mucous membrane. In case of contact with human skin, there is a risk of burns. Be careful if you use this method, as the drops may get into your face or eyes.
Use a respirator - the smell emanating from caustic substances can also enter the respiratory tract, which can also cause irrevocable harm to a person. But a respirator can trap the smell.
Wear glasses - if dust and grains of chemical elements get on the mucous membrane of your eyes, they can cause burns or damage your eyes. Moreover, at the preparatory stage this will help you a lot.

If dust or paint does get in somewhere, follow these instructions:

Rinse the area where the pollen has landed. If you find deep damage, immediately seek medical help from specialists.
If you swallow dust, you should immediately leave the room for fresh air and try to cough. Be sure to rinse your nose. If you start to feel unwell or experience pain in your lungs, immediately call an ambulance and seek help from specialists.

Before you begin such manipulations, carefully consider your workplace and escape routes. This is necessary in case something happens. You will immediately know what exactly to do and what to get from where.