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

How to unscrew the broken bolt, without damaging the thread in the hole

Types of kinks

Usually such fasteners break at the end of the thread, although there may be exceptions. As a result, the hardware itself can be deepened into the hole, protrude above the surface or even level with it. Proceeding from this, it is necessary to decide how to unscrew a broken bolt, paying attention to this particular moment.

Surface breakage

This type of failure refers to the option when a piece of hardware protrudes above the surface. We can assume that it is the easiest way to solve such a problem without using radical measures. However, before making any unscrewing of the broken bolt, it is worthwhile to work the place with kerosene to eliminate the build-up and weaken the contact of the surfaces.

  • If the protrusion is quite large, then the easiest way to use tools such as pliers, ticks or clamps, with which you can grab a part and screw it out on the thread.
  • Some experts, when asked what to do, if the bolt that is very tightly seated in the hole breaks, it is recommended to use a welding machine. With its help, you can weld a lever to the hardware, which as a result will allow you to get a large shoulder for rotational movement.
  • You can also use a drill bit slightly smaller than the bolt. Drill a hole through the center of the bolt to the full depth. After that, the remainders of the fasteners are removed with the help of a hook, trying to unscrew the thread from the very bottom.

Closed flush

It is believed that this breakdown is the most difficult, because it is sometimes very difficult to determine the diameter of the hole, especially if the fasteners were cut. Therefore, in order to determine how to drill a broken bolt of this type, it is first necessary to clean the surface, determining the gaps.

Quite often, the site of the cliff has very uneven shapes, which can be difficult to straighten out with this arrangement. Drilling in this state the product does not work. That's why the core is first used, which prepares a place in the center for working with a drill.

Further actions describing how to drill a broken bolt are described in the paragraph on surface breakage. After making a hole, the remnants of the thread are simply removed by crocheting.

The break below the surface

Such damage is rather complicated, especially if the part itself is made of soft metal. Therefore, you need to solve the problem of how to unscrew the broken bolt and do not damage the thread in the hole.

First of all, using the core, the center of the hardware is planned. In this case, it is best to use a thin tool of durable metal in order not to accidentally damage the part.

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

After that, in the hardware itself, drill a hole for the tap, but do not greatly deepen it. Next, it is sufficient to install a tool for threading and cranking it on the move, which will lead to a twist. If this does not happen, then the tool is used as a conventional bolt, but do not apply too much effort to not break it.


The most correct answer to the question of how to unscrew a broken bolt is considered one in which it is suggested to use a tool specially created for this purpose. It is called an extractor and sold as a set of products of different diameters. Outwardly it resembles a tap, but without longitudinal slits 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 into several turns. Then begin to crank it until it stops, and then until it is fully wrenched.

There are several options for extracting 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.