Self-drilling screws mostly have part of the spout of a cylindrical shape and the other end in a conical shape. This design helps the operation of drilling and fixing. His head can be flat, rounded, flat and oval, but acts as a wick hole. These screws are particularly sharp and designed to efficiently drill a metal, wood or plastic surface. Used to join metal with wood, wood with plastic, etc. For builders, the use of this type of screw speeds up the task, because in one operation they can drill, screw and let fixed surfaces. In addition, they are as economic as the common screws. Self-drilling screws have good mechanical resistance properties.
Manufacturers offer a variety of head sizes and lengths that allow adaptation to achieve greater stability of the construction. According to the builders, they are a good alternative to J-shaped screws, nails head of lead, welds and rivets. Some of the known advantages of self-drilling screws: are manufactured from steel; This allows them to be resistant to cutting and friction. They are reusable, since the tip cutting edge is prepared so as not to deform with successive perforations. Some manufacturers include a special heat treatment, which makes them resistant to thermal variation. It can withstand high demand; the maximum torque that can meet varies between one hundred and eighty and two hundred kilograms per centimeter. As this type of screws are designed to meet high demands, it has lots of uses.
Some of the most common applications: the Assembly of scaffolding and ceilings. The construction of silos. Billboard type advertising. The union of profiles and metal parts. Fixing car bodies. The fixation of ventilation ducts. Covered metal construction. Hardware. The veneer and wood constructions. The union of plaster profiles. The metalwork. The zingueria. Most of the screws are manufactured in steel. This is due to the properties of this material that can comply with the requirements of technical quality and economy. Although one of the limitations of the common steel is that it can corrode. As screws function as support in constructions and some are placed outdoors, avoid corrosion. Because any damage to them can become a serious problem for the structure. To avoid this, the screws have a zinc bath in molten state. This process is known as galvanized.