In this article, we will talk about this type of hardware, like countersunk screws. Our tips site will tell you about their features, varieties, wide range of applications and rules of use.
The main difference between a countersunk screw and a conventional bolt is that its head is completely recessed into the structure or material, without remaining on the surface. The rest consists of a countersunk screw, like a bolt, of a rod without a sharpness and a head.
The main part of the screw is most often tapered, this is what allows flush installation. May have slots:
- Allen key.
- With a screwdriver, about the varieties of which the portal has already written. Most often, ordinary flat or Phillips screwdrivers are used to screw in countersunk screws..
The standards for the production of countersunk head hardware are established by GOST R 50403–92, GOST 17475, and GOST 17475–80. Such screws are made of alloyed and carbon steel, as well as stainless and non-ferrous metals. According to the degree of strength, hardware is divided into 11 classes, and in terms of accuracy, only two. In the case of ferrous metals, additional galvanizing or zinc-lamella coating is applied.
Important! Self-tapping screws can also have a countersunk head, they belong to the broad category of self-tapping screws.
The thread can go along the entire shaft of the screw, or it can be partial, only at the end. The length varies from 2 to 120 millimeters, the diameter can be from 2.2 to 6.3 millimeters, the thread diameter is from 1 to 20 millimeters. Depending on the size and other characteristics, countersunk screws can be used:
- For assembling furniture. Here, such screws are indispensable, since protruding parts must not be allowed.
- Sheet metal fixation.
- Fixing plastic.
- Fixing wood-based panels.
At the same time, hardware can be mounted both deaf and through.
Important! Flush-mounted screws with a hexagon or Phillips head in the furniture industry are called confirmatory.
Of course, countersunk screws are used in instrumentation, mechanical engineering and other industries.
For ordinary, non-self-tapping screws, you first need to make a hole of a suitable size, countersink the mounting part. The screw is screwed in with a screwdriver or screwdriver, which should correspond to the type of slots. It is very important that the head of the hardware is recessed into the material, but not with deepening, namely flush.
Countersunk screws are screwed in strictly perpendicularly, and from above they can be closed with special decorative plugs – this is important for assembling furniture.