In shape and appearance, the product resembles a small compressed washer. It is used in the industrial and construction fields. A self-tapping screw with a press washer has many advantages compared to other types of fixing structures. It should be used according to the rules.
What is a self-tapping screw with a press washer?
The type of product under consideration is a washer with a large working area. This ensures better fastening of the individual sheet elements. A galvanized self-tapping screw with a press washer is excellent for structures that have a fragile structure. A regular washer may fall into the material during operation. There is a risk that the same problem will arise when screwing in a regular self-tapping screw. The press washer creates a uniform load on the material and prevents the bolt head from sinking into the material.
Characteristics of self-tapping screws with a press washer
Fixing elements are usually made of steel. They are coated on top with a thin layer of zinc. The roofing self-tapping screw has the shape of a hemisphere, and its press washer is placed on the back side of the tool. It differs from a conventional fastener in its scope of application. Self-tapping screws with a press washer have a tip shaped like a drill and can easily make holes in steel sheets.
Self-tapping screws with a washer not only do not sink into soft materials, but also ensure their better fixation to each other. With their help, the time required to carry out certain types of work is reduced. When working with self-tapping screws, it is not necessary to use a drill, especially if the hole width does not exceed 2 mm. You can also do without additional devices in cases where the recesses are already present in the material.
Classification
Characteristics of self-tapping screws with a press washer:
- standard size (length, outer diameter of the head, thickness, thread pitch and other parameters of the self-tapping screw with a press washer);
- what alloy the fasteners are made of (steel, brass);
- sharp tip or drill.
Depending on the density of the materials to be fastened, choose self-tapping screws with a sharp tip or with a drill. Hardware with a sharp tip can be screwed in with a screwdriver or screwdriver without pre-drilling, if the density of the base allows it. Similar fasteners are used when working with wood, plywood, metal profiles and sheet metal. If the sheet metal thickness is more than 0.9 mm, you must first drill a hole for the self-tapping screw, otherwise the hardware will get stuck in the metal and will not pass through the material.
To fasten sheet steel with high strength values, self-tapping screws with a press washer and a drill at the end are used. Fasteners for metal must be denser than the material being joined, which is done when using hardware with a drill. For such fasteners, the head is often made in the shape of a hexagon. During the screwing process, more effort must be applied, and the strength of the cap must be ensured. For manual installation of self-tapping screws with a drill and press washer, use a wrench of the appropriate size.
Self-tapping screws are also classified into hardware for woodworking and metalworking. Wood screws have wider threads and a higher ridge. For wood species with high density, hardware with wavy or torn threads is used, which prevents the formation of cracks after screwing in the fasteners. Metal hardware is distinguished by smaller and often threaded threads, which ensure ease of installation and strength of the connection.
Another type of fastener is a roofing screw with a press washer. It has a drill and a hexagonal pressing head. To ensure the tightness of the connection with the hardware, use a rubber sealing washer. Since moisture resistance is of paramount importance for the longevity of the roof, a rubber gasket is necessary when making fastening connections. Roofing screws are produced with a colored polymer coating, which is resistant to mechanical stress, changes in humidity and ensures a long service life of the roofing material. The design of the self-tapping screw with a drill allows you to install fasteners without pre-drilling.
Using self-tapping screws with a press washer
Products are often used for fastening thin metal plates. They are especially in demand when installing profile sheets. There are other areas where metal self-tapping screws with a press washer are used:
- internal construction work (installation of metal sheathing);
- fastening of individual elements on sandwich panels;
- construction of window and door slopes;
- installation of ventilation systems;
- installation of load-bearing barriers with metal support elements
All of the above areas occupy a significant share of construction, so the importance of self-tapping screws with press washers in this industry is very great. With their help, you can fasten plates up to 0.9 mm thick. If the sheets are thicker than 0.2 mm, then in addition to the fixing elements, will you also need a screwdriver, screwdriver or electric drill with a suitable attachment to perform fastening?
With drill
They are most often created from very high quality steel and are also coated with a small layer of zinc. The head of such a device has a hemispherical shape, and the press washer is located on its back side.
- And if the design of this device may have certain similarities with the first one, then with the area of use it is quite the opposite.
- The main feature that distinguishes this self-tapping screw with a press washer from the rest is the ability to work specifically with a metal surface. The tip of the tool, which is similar in shape to a drill, quickly creates a hole in the steel sheet and the threads go deeper into the material.
- It turns out that self-tapping screws for metal not only create an excellent connection, but also reduce the time required to complete all work several times. In this case, it is not at all necessary to use a drill: if the width of the hole being created is less than two millimeters, the self-tapping screw itself can handle this work. Well, if there is already a prepared hole in the metal sheet, the self-tapping screw will cope with the required task without the help of any other devices.
Like all other devices of this type , these devices are purchased, most often, in bulk. The price for approximately one kilogram of such screws varies from 100 to 150 rubles.
What types of self-tapping screws with a press washer are there?
Products are divided into 2 types: sharp and with a drill. They differ in the type of tip. The sharp type is used as wood screws and a drill. In terms of technical characteristics, they are not much different from standard fasteners. Their rounded head is suitable for working with a screwdriver and screwdriver. Products with a drill are used for fastening metal sheets with a thickness of more than 0.9 mm.
Sharp self-tapping screw with press washer
The products are highly durable because high-carbon steel is used in their production. They are coated with zinc, which protects the self-tapping screw from destruction and rust. On the head of the element there is a cross-shaped pin. It is necessary so that, if necessary, you can use a screwdriver.
For woodworking, a sharp, painted self-tapping screw with a press washer is often used. It reliably fixes the work surface with sheet materials. The design looks aesthetically pleasing, as the brown self-tapping screws with a press washer look inconspicuous against the background of the wood. Products are sold not individually, but by weight. For 1 kg of sharp screws you need to pay about $2.
Self-tapping screw with press washer and drill
This type differs from the previously discussed mainly in areas of application. A self-tapping screw with a drill is manufactured exclusively for working with metal materials. Instead of a tip, like sharp fasteners, this type has a small drill. Such products are made from stronger layers of steel, because when drilling metal they are subject to a greater load than when working with other types of materials.
The self-tapping screw head with a press washer and drill is the same as for the sharp type of product. It can have not only a cruciform, but also a hexagonal shape, because it bears a large load. Self-tapping screws with a drill can be secured in different ways: manually, with a drill or screwdriver, or with a wrench. They can be used to fasten metal sheets exceeding 2 mm in thickness. The price of products of this type is $3-4 per kg.
Sharp self-tapping screws for metal with a press washer
The main material from which they are made is high-strength carbon steel. Moreover, during the production process, a small layer of zinc is applied to this tool, protecting it from rust and other negative environmental influences. Thus, this self-tapping screw with a press washer is very durable, reliable and resistant to corrosion. The head (that is, the cap) of this tool has a hemispherical shape, under which there is a welded press washer. The pin of such a self-tapping screw is most often cross-shaped.
Where is the hemispherical self-tapping screw “press washer” used? Its main area of application is the installation of wooden structures and working with various wood materials. Thanks to the presence of a press washer, the device perfectly presses the sheet material to the surface being processed, thereby ensuring a reliable and high-quality connection. The result is a strong and durable structure. And even from an aesthetic point of view, it looks very attractive. That is why a sharp self-tapping screw with a press washer is a leader among its “brothers”.
How to choose a self-tapping screw with a press washer?
Among all the options available on the market, you need to choose a quality one. The strength of the fasteners and the reliability of the entire building structure will depend on this. Criteria that people pay attention to when buying a self-tapping screw with a press washer for metal:
- The color scheme of all elements in the batch. White self-tapping screws with a press washer should not have any other colors. Products of the same color in a batch undergo careful control during production.
- Self-tapping screw size. One element should not differ much from the rest in size.
- Same thread pitch.
- No burrs on the tip of the product. They interfere with its quality screwing.
- The presence of markings in the form of a capital letter. It indicates that the product was manufactured at the factory and meets the required standards.
Dimensions of self-tapping screws with press washer
The range of products is presented in a wide range of colors. Thanks to this, you can choose the appropriate option for any type of construction work. Stainless steel self-tapping screws with a press washer are produced in strictly defined sizes. They depend on the type of product and the purpose of its use:
- Fasteners with sharp tips have dimensions from 4.2x13 mm to 4.2x76 mm. The weight of 1000 units with the smallest dimensions is 1.4 kg, and with the maximum – 5.1 kg.
- Self-tapping screws with a drill are available in a standard diameter of 4.2 mm. Their length varies from 13 to 76 mm. The weight of 1000 minimum weight units is 1.75 kg, and the largest ones are 5.7 kg.
