Is it possible to unscrew a self-tapping screw with a ripped slot - professional advice
Self-tapping screws - this is one of the types of fastening of parts, which consist of a metal rod, and it has a sharp thread, as well as a head into which a tool is inserted for rotational movements.
Such details are very often used for construction work, and they also differ in shape, purpose and other parameters.
Different types of self-tapping screws are used for different works, and for their correct use, you will need to study the purpose, because otherwise you will be faced with the task of unscrewing the self-tapping screw with a torn off slot.
. a self-tapping screw is the same screw, but only in a modern version. In the old days, almost all fastenings were made with screws. To do this, it was necessary to drill a hole, and then screw a screw into it. Unlike screw fastening, self-tapping screws do not require additional preparation, which will be associated with drilling a hole.
They can be screwed into any suitable surface using a screwdriver or even a regular screwdriver.
According to external data, the differences between two such fasteners are small. The screws in the upper part under the head have a smooth part of the rod, on which there are no threads, but self-tapping screws have a thread on the entire rod to the very head. Ignorant people may not even immediately pay attention to such features, and will not even find differences. In construction markets, small screws are sold by weight, but large samples are sold by the piece.
Hardware and hardware stores have an incredibly large selection of self-tapping screw parts (this is the official name of self-tapping screws) by material, purpose, shape and other parameters. So that you can understand all the features, you need to consider such an issue in more detail. When buying fasteners, each person will be guided by certain tasks that are assigned to the product.
Self-tapping screws for metal with sharp ends
Outwardly, such fastening parts will resemble ordinary screws from the times of the USSR. They are made of durable steel, and they also have fine threads, unlike wood screws.
As a rule, the diameter of such attachment parts ranges from 0.3 to 0.5 cm, it all depends on the length of the rod.
Manufacturers make such fasteners with the following characteristics:
- The length is 1-5 cm, and the thread pitch is 0.5 cm.
- If the length is 6-10 cm, then the thread pitch is 1 cm.
- Self-tapping screws, the length of which is 11-12 cm, have a thread pitch of 1.5 cm (very rare).
- For lengths from 12. 5-22 cm, thread pitch 2 cm.
This information is indicative, and all manufacturers of fasteners can independently determine the size and pitch of the cut. For fixing the same sheet metal up to 0.2cm, no need to pre-drill the hole, and the sharp end will make the hole by itself. If the metal is thicker, you will need to drill the hole so that it is at 0.2-0.
3 cm smaller than the screw diameter. This will make it possible to provide excellent bond strength.
Self-tapping screws for metal are made of high-strength steel, and they are also covered with a special layer of protection, which has a black / gold look, and also a shiny metallic look.
Self-tapping screws with a drill bit
Before considering how to unscrew a self-tapping screw with a torn off head, it is worth first considering a couple more varieties of such fasteners.
A distinctive feature of such details from other types will be the following:
No holes are required to use these parts. The drill bit can make a threaded rod pass, which is similar to a drill. The shape of the head makes it possible to tightly cover the attachment point and secure it securely.
Self-tapping screws for wood
They have a certain feature in the form of a large threaded pitch.
Wood is a pliable, loose material, and therefore the thread pitch on the rod is made larger. The size of the diameters of self-tapping screws for wood is the same as for metal. The length can be up to 20 cm. In everyday life, such small parts with a black coating are often called "seeds", because outwardly they strongly resemble sunflower seeds. When screwing in self-tapping screws in wood, you do not need to drill holes, although if their thickness is 0.
5 cm and length is about 20 cm, then it is better to prepare the hole in advance.
The color of the coating can be different, and it is made using different colored enamels, so for each case it will be quite easy to choose the desired color. Such screws can be used to fix plastic parts and other materials. There are also universal self-tapping screws that can be used to fasten parts from a variety of available materials.
Torn off slots on a self-tapping head or even from a simple screw can often confuse home craftsmen.
Still, because it will need to be turned out, and the screwdriver will have nothing to cling to in order to even turn the screw even a little. We suggest that you consider several options for solving this problem. It will proceed from the fact that the screw cap is recessed, and it will not be possible to crawl up to it even with a hacksaw for metal. We suggest considering what tools you can use to solve this issue, and how difficult it will be to do it.
The most simple "folk "We have collected the means to solve this problem further.
So, the first thing you need to try is a small piece of genuine leather. It should play the role of a spacer between the bit and the screw. After that, with good pressure and at low speeds, try to unscrew the screw. It should be said right away that this method does not always work, and it should be done so that the splines of the cap are not completely smoothed - at least a minimum hook is required.
In a similar way, the masters advise you to try with a piece of rubber.
If the screw was not driven very tightly, then the method is quite working. But what if the slots are completely smoothed out, and the material into which the screw will be screwed is very dense. In this case, it makes sense to use "heavy artillery".
Unscrewing a self-tapping screw with a torn off slot is not so difficult. One of the most effective ways is to use a soldering iron.
It is better not to listen to those who say that it will be enough to warm up a self-tapping screw with such a device and it can be easily unscrewed - everything is not as simple as it might seem at first glance.
First, you need to process the cap and the hole obtained in it due to the breakage of the slots with soldering acid. It will help remove all oxide and dirt, which is an obstacle for solder adhesion. After that, take a small piece of tin and melt it on the head of the self-tapping screw with a soldering iron. It is necessary to heat until the temperature of the screw rises to the desired level for adhesion of the solder.
After that, immerse the bat in molten tin, and all that remains is to wait until it cools completely.
With this action we will pursue two goals:
For such purposes it is worth using a powerful soldering iron. A small device that draws 40W is not suitable for this.
When the tin is completely cool, you can unscrew the screw, and it will come out without problems.
If the methods described earlier did not give the desired effect, then additional tools and equipment will be required. In this sense, the engraver and the cut-off wheel were able to prove themselves quite well. With their help, you can make a small incision on the cap, and then the self-tapping screw will be unscrewed using the simplest slotted screwdriver.
For another method, you will need to go to the store to buy a special screwdriver attachment called "extract".
Such a cue ball has special slots that, when rotated counterclockwise, will bite into the steel of the self-tapping screw, and find even the smallest remnants of slots in the head. They will also cling to them, which will contribute to unscrewing the screw.
This is the bit to keep close at hand.In fact, there are many ways to unscrew a self-tapping screw or a screw with a torn off slot, and most of them are not even known to the craftsmen, which is why they spoil the surface, trying to pick up the cap with side cutters or pliers.
Slots torn off on the screw head are a nuisance, but not fatal at all.
In this case, do not immediately give up and try to drill the surface around the mount. You can find a way out of each situation, which means it is worth using the options described in the article.
In this case, it is worth starting with the simplest option, that is, in rubber and leather, and if there is an extractor in the set of home tools, then you can completely forget about the other methods, since this is the simplest option.
We hope that the methods described in the article will help one of the wizards when such a situation arises. Finally, we suggest watching a short video on the topic of the article, from which you will learn a lot about extractors.
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