During operation, anything can happen. Here, for example, screwing or reversing bolts have quite a serious chance of breaking the hat. This can happen because of wrong actions, poor quality of the fastener, or applying too much effort to the process. Whatever it was, after such an incident before the master raises the question of the necessity of removing the bolt from the structure. Not all do so, as it should.
The sad experience shows that many masters of ignorance or unwillingness to resolve on the wrong extraction bolt with a torn (broken) hat. Rough, careless extraction inevitably leads to damage to the entire thread, and possibly the product as a whole. This can be avoided if the right to perform the extraction with a special extractor, which today is not difficult to find on the market. Such a method is not only a right, but (ironically) and even lighter than crude extraction.
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Of course, for various reasons at hand or within walking distance can be extractors. In this case, the bolt can still be removed without damaging the threads. This will require "regular" set of tools that have the majority of the owners of the house. The most important thing to do everything slowly and carefully, as well as to carry out step by step instructions.
See also: a new generation of tools make repairs and construction of a pleasure
What tools will be needed
During operation, anything can happen. Here, for example, screwing or reversing bolts have quite a serious chance of breaking the hat. This can happen because of wrong actions, poor quality of the fastener, or applying too much effort to the process. Whatever it was, after such an incident before the master raises the question of the necessity of removing the bolt from the structure. Not all do so, as it should.
Note: Number of tools can actually be replaced. The most important among the listed equipment - a drill with a drill and pliers. It is also recommended to get a WD-40 structure, which should be treated with the place of work for 15 minutes before removal. It is necessary to facilitate the twisting process.
Step-by-step instruction
Step one. We put on the finest drill and drill to take a strictly on the center bolt. It follows that the drill does not take side. If the hole is to obtain the curve, then later in the recovery, there will be additional (and very serious) complications in the work.
step two. Gradually changing the drill on increasingly thick to ever since, until it is drilled out about one-third of the bolt.
step three. Take and score the opening triangular file. The bottom line is that it was the most densely. Otherwise, pull the bolt does not work.
step four. As soon as the file will be in the bolt and will then sit tight there, proceed to extraction attempts. For this, we also need to enlist the help of a pair of pliers or a wrench. We hold our file and begin to turn the lever formed.
step five. If the bolt does not give in, you can resort to one of "exotic" method of extraction. Reams metiz further so that it can be put another bolt of smaller size (diameter) from opposite thread by making a pre-ground (broken) by the bolt has a thread with a suitable tap. After that, we try to unscrew metiz, using a smaller bolt as a hat.
step six. If this method does not work, then at the very least you can try to continue to drill out bolt on as long as it is not enough to weaken. When this happens, it will unscrew using only one tap, the appropriate size
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A source: https://novate.ru/blogs/280519/50519/