Unscrew the torn off bolt in a hard-to-reach place. How to unscrew a bolt with stripped edges? Professional advice. Video: How to twist lapped and seamed screws

During various renovation works, people often face such a problem as a bolt that has torn off or lapped edges. In addition to wear on the faces of the bolt head, a situation may also arise when the thread is worn out or deformed or the bolt is simply destroyed. Faced with such a problem, a person begins to look for a way out of the situation, which, of course, is. Let's try to understand in detail how to unscrew a licked bolt or a bolt that has other deformations.

It is good if you have a special tool (for example, a hairpin), but if you do not have one, then you can solve this problem using other methods using the available tool.

Some practical adviceon how to unscrew the lapped bolt

1. Using a hacksaw or other metal-cutting tool, it is necessary to make a slot in the head of the bolt. Using this method, you can unscrew the bolt using a large slotted screwdriver. When unscrewing the bolt, it is recommended to lightly act with a hammer on the screwdriver and on the edge of the bolt head.
2. Another way is to simply try to pull the bolt out of the hole. This method can work if the thread is completely worn out and the bolt is loose. In this case, you can also use a sturdy slotted screwdriver to use it as a lever. If the bolt has large size, then you can use a nail puller. With the right approach, this method is very effective.
3. Another option to resolve the issue of how to unscrew a licked bolt is to use a so-called "liquid key". This method is classic among motorists. By treating the surface of the bolt head with a special chemical composition, you need to wait about half an hour. When the threads have softened, the bolt can be easily removed from the bore.

In addition to the licked-off head, the bolt may also have damage of a different nature:

1. thread wear,
2. fatigue failure
3. stripped thread,
4. stuck bolt.

Ways to unscrew a broken or deformed bolt

1. A hole is made in the head of the bolt, into which a metal rod with edges is driven with a hammer. After splitting the bolt, it can be freely removed from the bore. When using this method, it is not recommended to use fragile and unreliable metal objects (for example: a triangular file).
2. If the bolt head is located in an inaccessible place, for example, in the hole itself, then it is problematic to remove such a bolt. However, using a special glue or special means "liquid nails", you can easily solve this problem. However, the range of application of this method is very limited.

Practical examples for loosening bolts

When it is necessary to clean the cooling and ventilation system of a personal computer, very often problems arise with unscrewing the fastening bolts. In this case, it is necessary to apply a small amount of glue to the head of the bolt, being careful not to go beyond its borders. When the glue is dry. Once cured, the adhesive will increase the head area and seal the bolt edges. You can now carefully remove the required bolted connections.

By carefully following these tips, you can easily deal with any problem related to broken or worn bolt connections.

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Video: How to twist lapped and seamed screws

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With prolonged use, they can become unusable. When repair situations arise, it becomes necessary to remove fasteners and very often mechanics are faced with a situation where the product is rusted or has become unusable. Most often this concerns bolts and nuts. Their edges can be licked, the thread that has become unusable, the heads of the bolts break off. How to unscrew a bolt with torn edges or a torn off head? Let's consider several similar situations, each of them has its own specifics.

Removing a bolt with stripped edges

Can't always be found at hand necessary equipment for such work, especially at home. You can use the tools at hand, which can be found in almost every owner.

1st method. You will need a hammer and chisel. This is the easiest way, but not always effective. The chisel is installed at an angle to the product, then blows are applied with a hammer in the direction of unscrewing. Unfortunately, this method is not suitable for small bolts.

2nd way. It is necessary to clean the joint surface with a metal brush, treat it with kerosene or diesel fuel. Now you can try to unscrew the bolt using a spanner wrench. There is no guarantee that this method will work; the percentage that the bolt will unscrew is very small. The next method also explains how to remove the stripped-off bolt.

3rd way. In such a situation, the well-known gas key will come to the rescue. This device has a powerful enough clamp that allows you to grip even round objects. This method also has disadvantages, its use is impossible in hard-to-reach places of structures.

Removing the broken head bolt

The situation becomes more complicated if the head of the bolted product falls off. How to unscrew a broken bolt? Consider possible options solving the problem.

1st method. The main condition for execution is the protruding part of the broken bolt. With the help of a grinder, a slot is made in it for a slotted screwdriver. Now you can start extracting.

2nd way... To do this, you need a left-hand thread tap. We drill a hole with a diameter of 2-3 cm less than the bolt. We begin to screw in the tap into it, this action is performed until the broken part gives in and starts to twist.

3rd way. With a core and hammer. This method is similar to the step described above, describing how to unscrew a bolt with stripped edges, in step one.

Removing the bolt - using specialized equipment

To solve this problem, a number of devices are successfully used, which are very often used by car repairmen. Consider the most common extraction options using special equipment:

Unscrewing a torn nut

There are also several ways to do this.

1st method. The connection is preliminarily cleaned with a brush and moistened with kerosene or a special WD-40 solution. The time interval is maintained for 10-15 minutes. Now you can start unscrewing the nut using a spanner or open-end wrench. Before the unscrewing process, you can tap the connection with a hammer, the blows should not be too strong.

2nd way. If the connection is in a free access zone, unscrew the nut with
torn edges can be done using a vice or an adjustable wrench. It is clamped between the jaws of the tool and turns first slightly along the thread, and then in the opposite direction.

3rd way. If it was not possible to move the nut by the methods presented, then you should proceed to extreme measures. Cuts are made on the surface with a chisel and a hammer, after which the fasteners are disassembled. The use of a nut removed in this way in the future is impossible.

Removing the swivel fastener

Sometimes situations arise when a bolt scrolls in a threaded hole, how to unscrew it, we will consider in more detail. First you need to pry the product with a nail puller and pull it out to the maximum possible height. Leaving the connection at a stretch, gradually unscrew the bolt with a key. If there is no nail puller available, you can create a lever with a screwdriver. If the bolt small size, you can remove it with pliers. The head is clamped and pulled up with force. If the bolt is not pulled out immediately, then start rotating the head clamped by the pliers counterclockwise, without loosening the upward force.

The problem of licked edges of a screw for a Phillips screwdriver has long been known to everyone. There are few solutions to get out of this situation and remove the broken screw. I will only offer you seven, which I personally had to use.

How to unscrew a lapped screw?

Unfortunately, there is no near-universal solution. And each method presented is good for its situation. Therefore, everything is learned in comparison and applied to a specific individual situation and its own screw.

Method one: using a tourniquet

You will need a piece of thick rubber. This can be a piece of a medical harness, a piece of a camera from a bicycle, or the like. The denser and tougher the material is, the more twisting force can be created.
Berm the screwdriver as close as possible to the screw groove.

We take a tourniquet.

We put a tourniquet under a screwdriver or a bit and insert it all into the licked head. Next, with simultaneous pressure and rotational movement, we try to unscrew the screw.

With a competently applied force, the screw can be unscrewed with a significant screwed in force.

Method two: how to unscrew a screw with an impact screwdriver

If you have an impact screwdriver (or ask your friend), you can use it.

Of course, you cannot completely unscrew the screw, but you can significantly loosen the connection, and then we use an ordinary screwdriver.

The third way: we use a special bit for bolts with ground crossings

Since the problem of licked edges is not new, ready-made solutions have been sold on the market for a long time. For example - a special bit for unscrewing licked bolts.

We insert it into a screwdriver or screwdriver and unscrew it. Sharp edges at the right angle perfectly engage and the screw lends itself to rotation.

Method four: extractor

Special tools for repairing broken screws, studs, bolts and the like include an extractor. It works the same way as the bit in the example above, but with a slight difference.
We insert the nozzle into the screwdriver and unscrew it. You may first need to select an extractor for the indentation, since the diameters of the heads are different.

Fifth method: unscrew with the left drill

On sale, in addition to the usual drills for all of us, there are also drills with a left-hand helix. Such a drill can be used as a tool for unscrewing a broken screw.

Sixth method: using a core

This method works well for loosening small screws. We take a core, rest it against the edge of the cap at an angle of about 45 degrees and hit it gently with a hammer towards the rotation of the cap.

Kern, in view of its sharpness, has good engagement, which means that the screw is more likely to give in to unscrewing.

Seventh method: take a hammer and a chisel

The method has become a classic, but it is problematic to use it for small screws. We take a chisel or chisel, remove the caps with a tip to the side and gently hitting and turning the screw. Here the main thing is to move the cap from its place, and as it seems, unscrewing can be continued with pliers.

For more information, see the video.

Any master will agree that the edges of a screw always break off at the most inopportune moment. It seems to beginners that it is impossible to get it, but it is not. To feel confident, the builder needs to know how to remove the ripped bolt.

This situation can occur because the screw or tool that is being used is already worn out. When the contact of the screwdriver with the screw is not tight enough, the edges begin to "lick".

If the craftsman applies little force to the tool during work, this can provoke destruction of the edges.

What should be done?

In order not to aggravate the problem, you need to stop all actions immediately after the tip of the screwdriver began to jump off or scroll. You should not persistently continue to move, as this will not lead to anything good. Now the main thing is to get the bolt out without damaging the material in which it is located.

Changing the screwdriver

The next step is to replace the old screwdriver with a new one with no worn out tip. With this tool, you can try to remove the screw. Before starting work, make sure that the tip of the screwdriver fits snugly into the grooves.

If the screwdriver still slips, you need to find other ways to unscrew the bolt with the torn off edges.

If the screw does not come out ...

In the event that the bolt has not fully entered the material, you can try to pull it out with pliers. To do this, grab the head from the sides. It is necessary to turn slowly and in the opposite direction from the clockwise movement. As a rule, after a few careful manipulations, the screw is removed from the surface.

A hacksaw for metal can be used when the screw is not completely tightened. Make a small cut, about 1-2 mm, and then use a screwdriver to try to remove the jammed screw. The sting must be sharp, otherwise you can "lick" the edges of the cap even more.

Flame use

If the material is fire resistant and tolerates high temperatures well, you can try to remove it with a match or lighter. When heated, the screw will slightly increase in size, respectively, will compress the material.

When it cools down and has its original dimensions, a tiny gap should appear between it and the main surface. Then, using pliers, it will not be difficult to remove the screw.

WD-40

This lubricating fluid is simply indispensable in situations where you need to unscrew a bolt with torn edges. It must be sprayed into the microscopic gap that exists between the screw and the material. The lubricant will reduce the frictional force and will be easier to reach.

When none of the methods helps, it remains to drill the screw. This can be done completely or halfway, and then screw in the extractor and remove the bolt.

Helper methods

Experienced craftsmen recommend cutting off the screw head with a grinder or chopping it down with a chisel. Next, select a smaller drill and drill out the bolt. If necessary, repeat the steps, slightly increasing the size of the drill.

If the screw is small, beat it in the direction of unscrewing. You can also use drills with left rotation. The speed should be low.

Hairpin

Craftsmen who often face the problem of how to unscrew a bolt with torn off edges should think about purchasing a special tool. The stud driver helps to unscrew the screw with a completely stripped head. But from its use there will be a positive result only when it was possible to make a few turns.

Basically, each repair does not go smoothly, but with the emergence of small problems, the elimination of which takes time and effort. What to do in a situation when it is necessary to disassemble the structure, and the bolt is rusted or damaged, we will analyze further.

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

How to unscrew a broken bolt?

Basic methods:

1. The surface is cleaned with a metal brush and treated with diesel fuel or kerosene. They are trying to unscrew the nut with a spanner wrench. Although there is no one hundred percent guarantee that it will unscrew.
2. With the help of a chisel and a hammer, blows are applied in the direction of unscrewing. This method will not work for a small nut.
3. Power Clamp Gas Wrench good remedy in this situation. It is easy for them to grasp even round objects, but harder in hard-to-reach places. The longer the handle, the easier it is to unscrew.
4. When the fastening material is large and difficult to unscrew, it is possible to apply a metal coating using welding equipment and prepare the desired turnkey shape with a file.
5. A hole is cut out with a drill inside the body of the fastener, an L-shaped rod is threaded through it, which will serve as a handle, and removed.

When there is enough room to use an adjustable wrench or pliers, that's good, but what to do in other situations?

How to remove a hex head bolt or sprocket

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

The TORX sprocket is selected by size (it should not be large and slots into the hole for the hexagon). It is inserted tightly into the cap and the bolt is unscrewed with a jerk, in order to avoid disruption of the sprocket slot. Driving sprockets with holes in the center breaks them off and is therefore not recommended.

In any construction and auto shop extractor kits sold... Outwardly, this device looks like a metal rod with a tapered thread on the left side and a faceted base on the right. With their help, unscrew the nuts with torn off edges. To do this, a hole is drilled strictly in the center of the bolt, an extractor of the required size is hammered into it and unscrewed with pliers. This is done simply and quickly, because the extractor has the opposite cutting.

A reversible drill is an irreplaceable thing. Make a hole at the bolt with a thin drill. Take a left-hand drill with a smaller diameter and drill the damaged bolt in the inverse rotation mode.

If the head of the bolt breaks off

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

Three ways:

1. A hole is drilled 3 cm less than the diameter of the bolt and a tap with a left-hand thread is screwed into it until the broken part begins to unscrew.
2. If part of the bolt protrudes, then a cut can be made on it with a grinder for a slotted screwdriver and proceed to unscrewing.
3. A hole is made at 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. Torx of the right size will help to cope with this problem.

How to drill out a broken bolt

Professionals advise using a small diameter drill and make sure that it does not tilt to the sides when working. When buying, you need to focus on the country of origin and cost. Quality drills cannot be cheap, specially sharpened and made from hardened steel.

Removing nuts and bolts produce slowly and consistently, it is impossible to rush in this case, otherwise unforeseen problems and loss of time for their elimination will arise later. For example, many auto repairmen are in a hurry to unscrew the rusty bolts that break. Much time is wasted fixing errors. Therefore, you need to immediately plan the course of action. How to deal with rusty bolts is discussed further.

How to unscrew a stuck bolt

Car repair is often more difficult due to the presence of corrosion and oxidation of the fasteners. For example, at the factory, during assembly, the master did not process the threads with lubricants, and during operation water got into it. As a result, the bolt seemingly stuck tightly, but such a nuisance can be dealt with in several ways.

Unscrew rusted bolt or nut by tapping

When tapping off the bolt rust and scale are removedso it becomes easier to unscrew it. The operation is carried out with a hammer, turning with a special tool in order to create a torque. With care, 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 grease. If available, put on an anther on the connection.

Using solvents

In the arsenal of any experienced car enthusiast, there is always a set of fluids to combat rust and other plaque. They mainly use WD-40 with good penetration into microgaps, the cost of which starts from 100 rubles... Along with it, brake fluid, white spirit, kerosene, 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 has become attached to the A-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 means, wrap a nut and leave for a while. Then the bolt is tapped to destroy the softened rust and begin to unscrew.

Thermal method

When the solvent fails, you can try exposure to fire and cold... A gas burner is sold in any large auto or hardware store, with its help heats the bolt to a bright orange color. Then they cool it with machine oil and try to weaken it. If the attempt is unsuccessful, the process is repeated again.

This method does not always help, and when close to the paintwork, the fuel tank is very dangerous. When working with a gas burner, you must follow the rules fire safety and do not use it without a fire extinguisher at hand.

Sprays are used to freeze products to keep the bolt further use... But such reagents are mainly used by professionals, since in a domestic environment it is a costly and unprofitable business.

How to unscrew a licked bolt

When the bolt is turned, it is pryed with a nail puller and pulled out to the maximum possible height, left in a stretch and gradually unscrewed with a key. When the nailer is not present, a screwdriver can be used. A small bolt is removed with pliers by the head. If it does not give in immediately, then rotate it, clamping it with pliers counterclockwise with an upward force.

Use a tap, insert it all the way. If it is not at hand, then a screwdriver with a tapered edge will do, which is carefully hammered to the stop and try to unscrew.

To prevent such situations from repeating, they must be treated with graphite grease before tightening the bolts. But solid oil or lithol is not used for this purpose, because they are used for rubbing parts, and after lubrication, bolted joints become jammed.