Roofing screws with drill 5.5x25 mm (7 kg) galvanized

Self-tapping screws with a washer and drill are designed for installation and fastening of various types of sheet materials and thin steel. Manufactured from high-quality steel alloy followed by galvanizing to prevent premature development of corrosion.

Types of self-tapping screws with a press washer: • with a sharp tip; • with a drill tip.

Sharp self-tapping screws with a press washer.

These self-tapping screws are made of high-strength carbon steel. The head of the self-tapping screw has a hemispherical shape, under which there is a welded press washer. The self-tapping pin is cross-shaped. The self-tapping screw perfectly presses the sheet material to the surface, providing a reliable and high-quality connection. A sharp self-tapping screw with a press washer is a bestseller.

Self-tapping screws with drill.

They are usually made from higher quality materials. The head of the self-tapping screw has a hemispherical shape, and the press washer is placed on its back side. This type of self-tapping screws is intended exclusively for working with metal surfaces. The tip of the device, which resembles the shape of a drill, makes a hole in the steel sheet, and the thread goes further into the material. Metal self-tapping screws with a press washer provide a high-quality connection and significantly reduce the time required to complete the work.

Find out the cost of self-tapping screws with a press washer

Screw weight calculator

Correct calculation of the weight of self-tapping screws is necessary for large-scale construction when such fasteners are purchased not individually, but in kilograms. Using our online calculator you can determine the weight of the quantity of hardware you need. It is based on the official characteristics of manufacturers who adhere to strict standards, so the calculation accuracy will be absolute.

Black self-tapping screw for wood

The main fastening element in construction and repair using wood.
They have a large thread pitch and a thin shank, which allows them to penetrate solid wood more easily. Low price and high strength make them ideal for rough work.

Phosphated metal self-tapping screw

This is a fastening element for connecting metal of various thicknesses, both with and without pre-drilling. Made from carbon steel and then treated with phosphate. This provides the self-tapping screw with the necessary strength and protection against corrosion. It differs from similar wood fasteners in having smaller carvings.

It is known to many builders as a drywall cutter and is used quite often, so it is more profitable to buy it by weight.

Galvanized metal self-tapping screw with press washer

This element allows you to fasten a sheet of metal up to 2 mm thick without pre-drilling a hole; the large cap serves as a washer and tightly presses the material being fixed to the base.
Covered with a protective layer of zinc, providing it with reliable protection against corrosion.

Galvanized wood self-tapping screw (white, yellow)

Used in finishing works, as a decorative fastening element and in the production of furniture.
Zinc coating provides reliable protection and a beautiful aesthetic appearance. Has a large selection of sizes, sold individually or in packages.

Roofing screw

Used for fastening corrugated steel, metal tiles and other roofing metal.
The base of the fastener is galvanized, and the top part can be painted with powder paint in colors according to the RAL table. The tip with a drill allows it to be used without drilling. This hardware is equipped with a washer with a rubber gasket to prevent moisture from penetrating into the hole. Sometimes the self-tapping screw and this washer are sold separately, so the weight may vary.

Self-tapping screws catalog

Drywall-wood self-tapping screw, pre-packaged

Self-tapping plasterboard-metal prepackaging

Metal-to-metal self-tapping screw with press washer, industrial packaging

Roofing screws painted in the basic colors of the roof according to RAL, pre-packaged

Sealing washer (EPDM)

Self-tapping screw for GVL pre-packaging

Window self-tapping screw, drill, white zinc

Window self-tapping screw, drill, yellow pass

Self-tapping screws, white/yellow, sharp

Self-tapping screw for sandwich panels, pre-packaged

Metal-to-metal self-tapping screw, pre-packaged

Roofing self-tapping screw DIN7504K pre-packaged

Black wood screws

Fasteners of this type are represented by galvanized elements with large threads and a cone-shaped head and are aimed at rough work. There is no need for drilling for screwing. Among the three types of wood screws, black ones are the cheapest and most common. Due to the fact that the production technology does not provide for anti-corrosion treatment, they are not suitable for external elements, as well as for internal ones designed for conditions of high humidity.

These products are available in a variety of sizes. It depends on how much they weigh and how they are used. Options with a length of 1.1 cm have a larger thread angle. Self-tapping screws measuring 3-4 cm are considered the most universal. Options with a length of 7 cm are suitable for fastening two 5 cm beams. Fasteners measuring 20 cm are designed for large-sized furniture.

Self-tapping screws with a diameter of 0.35 cm have a length from 1.6 to 5.5 cm. Their weight varies from 1 to 2.34 g, respectively. Parts with a diameter of 0.38 cm have a size of 2.5-7 cm and a weight of 1 to 3.9 g. 0.42 cm fasteners are found in sizes 6.5-9 cm. Their weight is 3.09-4.8 g. Options 0.48×9.5-0.48×15 weigh from 5.1 to 11 g. It should be borne in mind that, according to measurements taken to find out how much a wood screw actually weighs, the declared values the masses are not always true. In addition, the announced length may not correspond to the actual one. The measurement results indicate how much the difference is between the declared and actual values ​​of these parameters. Thus, the actual weight of 0.35×5.1 wood screws is 2.63 g instead of 2.23 g. Parts 0.38×6.5 actually weigh 3.52 g instead of 2.95, and their actual length is 6.4 cm. The mass of screws 0.42×7.5 is 4.89 g instead of 4.3 g. Products 0.48×10 (0.48×10.2 in reality) weigh 3.07 g more (8.67 g) than stated. Options 0.48x12.7 are heavier in reality by 1.03 g (10.13). Fasteners 0.48×15 weigh 11.24 g (+0.24 g) and 0.2 cm more. Thus, all measured screws turned out to be heavier than the announced values, some by much. Plus, many of them are a little longer. These parameters should be used to calculate how many screws are in a kilogram. The manufacturer's table indicates a quantity of 1000-91.

Main dimensions of roofing screws for fastening to metal structures

Yellow wood screws

These parts are used for furniture, hinges and slats, and are also suitable for outdoor use. In addition, they are considered decorative, so they are almost universally used for surface fastenings instead of black ones. They also consist of carbon steel, but differ from black self-tapping screws in a more durable head due to the lack of heat treatment and a zinc coating, which makes them resistant to moisture and coloring. The products in question are also available in many types of sizes. Instead of black analogues, they are used depending on how much the diameter is. Thus, it is recommended to use options with a diameter of up to 3 cm, since thicker self-tapping screws are impractical due to the fact that they split dry wood, like black ones, and at the same time are more expensive. According to experimental data, for such 0.3 cm fasteners with a length of 1-4 cm, the mass is 0.46-1.22 g.

It should be noted that there are galvanized analogues in black and yellow. Coloring in this case serves to indicate the scope of application. Thus, black self-tapping screws are designed for lightweight structures, and yellow ones are designed for dense wood.

White self-tapping screws for metal with a press washer

These options are designed for connecting metal parts and fixing them on a plastic base. In addition, they are suitable for dense wood. Such self-tapping screws differ from the options discussed above in that they have a higher frequency of thread turns and a semicircular head. The press washer is represented by an enlarged cap, providing a larger pressing area. Typically made of alloy steel. There are products equipped with a drill, represented by two blades at the end. They are aimed at fastening metal sheets thinner than 2 cm without pre-drilling. The weight of 0.42 cm screws with a press washer 1.3-7.6 cm long is 1.3-4.5 g. The number of such screws in kg, according to the table, is 1000-193. In comparison with the manufacturer’s data in the weight table for metal screws, the resulting weight values ​​differ in all cases and in some sizes.

Thus, 1.3 cm galvanized elements with a press washer and drill are heavier by 0.3 g, 1.6 cm - by 0.62 g, 1.9 cm - by 0.7 g, 2.5 cm - by 0.31 g, 4.1 cm - by 0.22 g, 5 (5.1) cm - by 0.59 g. Options with a length of 3.2 and 7.5 (7.6) cm, on the contrary, are actually lighter by 0.09 and 0.66 g respectively.

Roofing screws

Designed for fastening roofing materials to a metal frame and wooden sheathing, on the basis of which they are classified into two types. They are distinguished by the presence of a washer with a sealing rubber gasket, which serves to prevent precipitation from leaking. In accordance with the weight table for roofing screws, products 0.48×1-0.48×10.2 weigh 6.07-13.7 g. 0.55 cm options have a length of 1.9-7.6 cm and a weight of 7 .05-12.27 g. Parts 0.63×10.2 weigh 22.19 g. 1 kg includes 193-46 elements.

Calculation of the mass of screws

The size of these fasteners, described by parameters such as diameter and length, determines how much they weigh. The diameter for the most common universal self-tapping screws ranges from 0.16 to 1 cm. You can visually determine what it is equal to by the diameter of the circumference of the threaded protrusions. Length also includes a range of standardized values ​​from 0.16 to 1.2 cm.

For ordinary users, it does not matter how much the mass of screws is. However, knowledge of this parameter plays a role in their acquisition. This is due to the fact that self-tapping screws are sold both in packages and by weight. In the first case, a batch of goods includes a certain number of products, regardless of their weight. In the second option, weight is of decisive importance, since the rule is relevant here: the smaller the mass of each fastener, the more of them you can purchase for a certain amount. That is, the weight directly determines how many parts you can buy. Thus, by comparing the number of products in a package and at a certain weight and cost, a more profitable purchasing method is established. That is, calculating the weight of self-tapping screws helps save money when purchasing them.

Based on these parameters, tables are compiled that reflect how many screws are in 1 kg, how much one element weighs, how many 1000 pieces, etc. Due to the many unreliable data sources on the Internet, it is believed that the most accurate information is provided by the manufacturer. However, practical data obtained from measuring the parameters of self-tapping screws indicate that this is not the case.

How to screw a self-tapping screw into thick metal?

It is quite possible to screw any roofing screw or galvanized one with a press washer into thick metal, even if the hardware is not equipped with a drill. To do this, you just need to pre-drill the base. Using this method, you can tighten screws even into metal thicker than 5 mm.

The main principle for such operations is that the diameter of the drill should differ from the diameter of the screw by only a few tenths of a millimeter. The thicker the base and the harder the metal, the smaller the difference. For example: for tightening galvanized products 4.2 mm. in metal 2 mm. You will need a drill of 3.5 - 3.8 mm, and for screwing into metal 5 mm. You will need a 4.0mm drill. To achieve this goal, it is worth purchasing several drills, in increments of 0.1 mm, up to the stated diameter of the self-tapping screw.

Before screwing it into a critical place, it is better to drill a test hole and try to tighten the screw. After all, if the diameter is poorly chosen, the cap will easily break off and it will be difficult to remove the stuck tip.