Screws, it is most commonly used in most types of work fasteners, is a rod with male thread and head with slits for a screwdriver. Among them are screws black, At a cost they are the cheapest.
Why black screws - it's a bad choice
Typically, these screws are used to working with wood. I must say that his short black screws used for drywall sheets is quite acceptable, they are more - less well show themselves in this case.
Screws black - it is products which have undergone hardening. However, oddly enough, for them it is more a minus than a plus.
Let us examine the shortcomings of black screws.
1. The most important disadvantage of the black screws lies in the fact that they are too brittle. If you care with this fixing material of a little "twist", then this is easy to lose the screw head. In addition, the product are fragile and brittleSo twist them only in special, pre-prepared hole. That they do not, you can brush them with soap and water or any oil, but it does not always help.
2. Such products not only desirable to mount heavy construction. Strong loading black screws, unlike the white and yellow, can not stand.
3. Apply these screws is possible only under normal climatic conditions. A humid room or open area, these are the places where black metal screws will last very long. After a while they start to rust and will soon cease to perform its functions.
4. black screws quenched. After that, they become hard, but their flexibility is lost. They are just beginning to break under heavy load, and it can become a big problem.
As a result, we can conclude that it is necessary to apply the black screws only in certain places, in the absence of heavy loads and moisture. Then they fully justify his appointment. However, we must understand that this is not a universal product.
Summing up, we can conclude that using screws in black loaded structures and sites of increased danger, soon you can expect unpleasant and serious consequences because of the fragility of the data self-tapping screws.