Believe it or not - even fatal! You may say that the two self-tapping screws: wood and metal are almost the same, and will be partly right. But we should not twist the screw on the metal in the tree. And now I'll try to explain the danger.
To begin, take a look at the two self-tapping screws.
To understand what might be a danger comparable screws between themselves.
The tree density is much lower than that of the various metals. It is because the screws in wood carving step is larger than that of the self-tapping screws for metal. This is done so that the screw would have clung to the tree and threw up under load. Also, self-tapping screws in the wood have a sharp tip that is easily thrust into the wood and makes it easier to twist.
The gypsum boards and plastic dowels is also recommended to use a screw with coarse thread, as these materials, like wood, are very soft.
By the way, the screws are divided into three types, each of its colors: black (red-hot), yellow, and white (zinc plated). Black screws because of its hardening are the most fragile and dangerous bending. If you try to bend it, it will immediately break.
Just they have no coverage, and so it is quickly covered with rust and disintegrate. Therefore, to apply them in loaded and high-rise structures is dangerous for life! Because of its low cost, they are used only in the rough work (until the glue dries, for example ..). If you do use them, it is advisable to close with screws yet to score and nail.
And now some information about self-tapping screws for metal ...
They have a fine thread pitch. This is done for a better attachment to the metal. Steel is a very hard material, so small the screw thread pitch is very helpful.
If you need to attach a self-tapping thin iron or tin, you can do it without pilot drilling. Thus kernit metal is desirable, otherwise the drill will "ride" on hardware. For these purposes, there are galvanized screws with a special tip. Such the drill tip performs function when tightening.
And now let's sum up: why not use the same screw on the metal music for mounting in wood, drywall and plastic dowels?
And they can not be used for obvious reasons, because the bottom of a very fine thread. The tree itself - a soft material so the screw can easily pull out from under his load.
Of course, that's small and light poveshat it is possible, but large structures, heavy cabinets and shelves mounted on them life-threatening.
Imagine that you have a shelf with books hanging in the room, and under it there is a lounge chair. And God forbid, what would it was empty, when the regiment will fall.
Or take a more interesting and piquant situation... You sit on the toilet in the bathroom, dreaming about something... And above you hangs heavy cabinet with detergents, powders and other means. And here, in the most beautiful moment of this cabinet is flying to the bottom for you... In addition to pain and cry, here, for sure, will attend the mat and a terrible smell.
So, again. Do not use screws to metal with marked that either wood, plasterboard and plastics, what would you would not then excruciatingly painful and disgusting))
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