Peculiarities
A dowel screw is a fastener for structures that has special antennae for fixing to the surface. When spaced with a screw or screw, a frictional force arises, which holds the dowel in the structure and prevents it from turning. Dowels are made from different materials, they can have different weights and sizes. Depending on the material of manufacture, self-tapping screws have their own characteristics. For example, polypropylene products do not withstand low temperatures. They are not recommended for outdoor use. Nylon elements are versatile. They can be used both outdoors and indoors.
The dowel can be with a retaining collar. The screw is made from nylon and is used for external installation work. Its peculiarity lies in special stoppers. They do not allow the self-tapping screw to fall into the hole.
Self-tapping screws without a collar also have their own distinctive feature. The product is made of polyamide and has a through hole with longitudinal ribs and a non-expansion top. The structure of the product makes screwing in the screw much easier and increases the expansion force. The unbreakable top protects the surface from cracking due to its immobility.
It is also worth noting that these dowels are weather-resistant. They can be used for outdoor facade work. There are types of dowels for a construction gun. The products are practical, effective and securely fix parts to the surface.
All fasteners are manufactured in accordance with GOST. Some specifications are subject to change. These include weight, diameter, length, structure. But the basic rules must be strictly followed. Manufacturers strictly adhere to the following GOST standards:
- material of manufacture;
- min and max are the curvature index of the rod;
- protection from a galvanized layer - galvanizing is carried out in compliance with the rules of galvanizing and passivated technology (coating thickness - 6 microns);
- diameter of washer and metal rod.
It is worth familiarizing yourself with the numerous types of products and their properties.