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Black screw - one of the most frequently encountered products on the shelves of hardware stores. Most experts believe this type of universal screws. In reality it is not so, and there are times when the black screws should be abandoned.
No matter what you're working - wood or sheets of drywall. In both cases, the black screws manifest themselves perfectly. Keep it tight, almost never break, and different total reliability and durability. Every builder always chooses the materials and tools with which to work, and therefore he should take into account some of the unpleasant "features" of black screws.
Long black screws fairly easy to bend and break when trying to twist them into a solid material. Without pre-drilling screws so it is better not to use, so as not to break the wood even more. The slightest mistake in the process of tightening the fastener is fraught with disruption of the cap. If this happens, you have (most likely) to screw another side.
It is not necessary in the process of working with black screws and forget that they are intended primarily for use with lightweight structures. Heavy may simply not survive and break. In addition, this type can not withstand bending. When you try to bend the screw he is likely to break.
Finally, it is worth remembering that all the screws are covered with black oxide film, which is not a high level of durability. This means that the use, without additional measures the black screw is impossible. Left in the street he will soon rust and become more brittle. All this may be the reason that the structure holding them, will simply fall apart, underscore Novate.ru consultants.
Continuing the theme how to repair the drop-down outlet: non-standard way and not only.
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A source: https://novate.ru/blogs/010119/48970/