On the shelf of a hardware store you can find black self-tapping screws, various in price, size, thread, by purpose, etc.
n. There is an opinion that blacks are worse than other types. In our article we will try to figure out how and why black screws are worse than white and yellow ones.
To understand which ones are worse, you need to figure out what is the difference between them. Products are of different lengths, diameters, thread pitch, as well as different in purpose to a specific material.
When purchasing, everyone should focus on a specific problem that he needs to solve.
Self-tapping screws can be divided into the following types:
- For metal;
- For wood;
- For roofing;
Each of these species is subdivided into several more subspecies. But we are interested in the separation of self-tapping screws precisely by color.
Let's take a look at each type and then try to identify the pros and cons.
Products are sent for heat treatment, and then hardened to increase strength. After that, a protective coating is applied to them, after which the self-tapping screw turns black.
Note : This coating can be of two types: matte (phosphating) and glossy (oxidized).
There are wood and metal. Most often, such self-tapping screws are used in construction work in hidden areas, for which additional coverage is offered in the future.
For example, self-tapping bugs are used when fastening metal profiles to each other, which in the future will be upholstered with sheets of drywall.
Self-tapping screws with a phosphate or oxide coating are capable of protecting fastening elements only from mechanical stress, when galvanized products also protect from electrochemical influences. This is an organic non-metallic coating. The phosphate layer is usually applied to fasteners made of low alloy steel.
On Note : Phosphating Self-tapping screw - is the application of a protective strong phosphate film on it.
This coating is sufficient firmly bonds to the metal surface. This layer has good toughness and resistance deformation.
Strength is provided by a metal-crystalline coating layer. Also, black self-tapping screws have a porous structure on the surface, due to which excellent adhesion is formed. Such a surface well absorbs and retains lubricants, paints and varnishes, primer, putty and plaster.
White self-tapping screws are made using a different technology than black ones.They are produced using the same carbon wire, but without heat treatment. They are coated with zinc, which protects them from moisture.
The yellow self-tapping screw is practically the same as the white one, which is simply covered with yellow zinc and performs a decorative function.
Firstly, many people mistakenly believe that black self-tapping screws are suitable for working with absolutely any materials.
However, they are more often used to assemble wood or plasterboard structures.
Even on the shelf of a hardware store you can find a package of black self-tapping screws with the inscription "universal self-tapping screw". This can not always be trusted, since black self-tapping screws are not able to hold any materials firmly and for a long time.
Yes, indeed, such self-tapping screws have many advantages - ease of entry into a wooden surface , hardenedness, inability to rip off the spitz of such a self-tapping screw, ease of use, availability. But despite all these advantages, they also have disadvantages. For example, to tighten a very long black self-tapping screw, you will first have to drill a hole, otherwise they may break or bend.
In the process of twisting, for any erroneous actions, the cap comes off the screw. Because of what, next to it, you will need to screw another one.
Note : This type of self-tapping screw is intended only for working with light structures, since they are not able to hold heavy ones.
They cannot hold bends. If the screw is subjected to the slightest bending, then it simply breaks.
The oxide film is not durable. Therefore, such a self-tapping screw, when used in the open air, will quickly undergo rusting from constant exposure to moisture and precipitation.
From what such a self-tapping screw will become fragile and, most likely, the structure fixed by these elements will fall apart. Which will result in new renovations and costs.
This is how black self-tapping screws behave when fastening wooden structures.
But when working with drywall, they show themselves quite well - hold on tight and do not break.
Black screws are not always worse than white or yellow ones, they just need to be used to fix certain materials. But for wooden or metal structures located on the street, it is better to choose a different type of self-tapping screws.
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