Self-tapping screw with presshead: characteristics and varieties

Self-tapping screw with a press-washer is a screw that looks like a small squeezed washer from above. It is used in many spheres of industry and construction. And some say that this invention has no analogues on the advantages. What is the difference between a screwdriver and a presshead? Let's figure it out.

Varieties

To date, there are two main types of such tools:

• Sharp devices.
• With a drill.

To find out the peculiarities of each of them, let's consider both types separately.

Sharp self-tapping screws with a press

The main material from which they are made is high-strength carbon steel. Moreover, from above, a small layer of zinc is applied to this instrument during production, protecting it from rust and other negative environmental influences. Thus, this self-tapping screw with presshead is very hardy, reliable and resistant in terms of corrosion. The head (that is, the cap) of this tool has a hemispherical shape, under which is a welded press-washer. Spitz in this samoreza most often cross-shaped.

Where does the self-tapping hemisphere "presshead" be used? The main area of its application is the installation of wooden structures and work with various wood materials. Due to the presence of the press-neck the device perfectly presses the sheet material to the surface to be treated, thereby providing a reliable and high-quality connection. As a result - a strong and sturdy construction. And even from an aesthetic point of view it looks very attractive. That's why an acute screwdriver with a press-cup is the leader among its "colleagues".

Devices with a drill

They are produced, as a rule, from higher quality steel and also covered with a thin layer of zinc. The head of this device has a hemispherical shape, and the press was placed on the back side of it. And if the design of this tool can have some similarities with the first, then with the field of application quite the opposite. The main feature, which distinguishes this self-tapping screw with a press-tube from the others, is the possibility of working exclusively with a metal surface. The tip of the device, which resembles the shape of a drill, quickly makes a hole in the steel sheet, and the thread enters further into this material. Thus, self-tapping screws for metal with a press-neck not only provide a high-quality connection, but also significantly reduce the time required to perform a particular job. In this case, it is not absolutely necessary to use a drill: if the width of the hole is less than 2 millimeters, the self-tapping screw may well handle this work. Well and if in a metal sheet already there is a preliminary aperture, the self-cut independently will cope with a necessary problem without the help of any other devices.

Price

Like all other tools of this type, these devices are purchased, as a rule, in bulk. Approximate price for 1 kilogram of these screws is from 100 to 150 rubles.