Self-tapping screws with a press-tube are one of the types of self-winding screws, for which there is no need to make a special hole in the surface.
These fasteners are indispensable for installation worksah, because they allow you to quickly and easily attach various solid materials to each other.
Description
From themselves, self-tapping screws with a press-head differ in the shape of the head, as the name suggests, it is made in the form of a small washer, which, when screwed, ensures maximum downforce, securely fixing sheet materials. That is, their main area of application - the installation of profile sheets, sheets of plywood and so on, their device does not allow the head to penetrate deep inside the material.
Although they are applicable as self-cutters for wood, they are most often attached to metal sheet materials, for this reason they are made of strong grades of steel.
Particularly expensive and high-quality products are made from titanium, they are used wherever strength and reliability are particularly important.
White or yellow color, which allows not to stand out against the background of fixed sheets (even after painting), is provided by a layer of zinc, which reliably protects fastening materials from corrosion, and gives an attractive appearance. The thread on them is frequent, it provides a reliable grip.
As a rule, such self-cutting screws are short, since the sizes of self-tapping screws with a press-tube, which are in greatest demand, are 15-25 mm (length).
Types of self-tapping screws
Products are divided into two main types, depending on their tip.
Self-tapping screws with a press and a sharp tip. Practically no different from conventional, their head is rounded, adapted to work with a screwdriver or bat. You can tighten it either manually or using a screwdriver. They are great for working with both metal sheets, wood, chipboard, etc., additional drilling is not required in this case.
If, in the assembly works, sheets with a thickness of more than 0.9 mm are used, drilling will be necessary, otherwise the tip will roll up and not be able to pass the material.
Self-tapping screws with a press and a drill.
Instead of a conventional tip, a miniature drill is used here. Such products are made of strong grades of steel, since for the drilling of a hole it is necessary that the material of the self-tap is denser than the material of the fixing elements of the structure. They can be fixed sheet materials, the thickness of which will exceed 2 mm.
Hats can have exactly the same appearance as sharp sharpeners, however they are subjected to a greater load, so the caps can be in the form of hexahedron, so they can be screwed with a wrench.
Self-tapping screws with a press-cup can differ from each other in the shape of a cap, and in the sphere of application, we will consider several more varieties.
Self-cutting screws with drills and pressing caps are often used in roofing works, but in this case it is necessary that they be supplemented with rubber washers. One of the main tasks of the roof is to insulate the building against moisture, and the fasteners in this case may become a weak point. Rubber gasket, under pressure, tightly adheres to the surface of the roofing material, and provides full waterproofing.
Especially expensive varieties can have a polymer coating, which means that already at the production stage they are already painted in a certain color.
According to their performance, they are not inferior to the analogs, modern polymers can form a thin, and extremely strong film that perfectly protects the product from moisture and corrosion, will make the mount no less reliable than other types, and at the same time will have an excellent appearance.
They are used to fix painted profiles, if the colors match, the fastening materials will practically not stand out against the background of the sheets.
Typical dimensions of galvanized sharp
Among the regulatory acts in force in the Russian Federation, there are also standards that determine the standards for the production of fasteners.
Regulatory intervention of the state is necessary here, as self-tapping screws are widely used in construction work.
For really high-quality products, always labeling is provided, as stipulated by the current GOST.
Galvanized sharp screws are made of steel, after the first stage of production, the finished products are covered with a protective layer of zinc, which protects them from corrosion, greatly increasing the service life. According to the standard, the head is made in a circular cross-shaped shape.
Products for work on wood are distinguished by thread with a wide step, due to this they do not scroll and do not break. There are also varieties for screwing into hardwoods, in such products the thread is made in a torn or wavy form, it allows breaking wood fibers, reducing the degree of tree stratification, reducing the likelihood of cracking.
Self-tapping screws with a pressing washer and sharp tip are used to fasten the hardboard on the wooden base, plywood, and other sheet materials. They can also be used to fix the sheathing plastic material, here the pressing washer is necessary to protect against punching.
Sizes with drill
For their production, the most durable steel alloys with a high carbon content are used, this makes them as durable as possible, enabling drilling in the metal surface.
The tip is crowned with a drill, the head can be hemispherical or hexagonal in shape, the standards also provide for the presence of sealing rubber washers on the variety for roofing work.
The peculiarity of the design makes it possible to carry out installation work without first making holes in the surface of the metal. In the rest, they are no different from their counterpart with a sharp tip.
Self-tapping screws with a press cup sharp
Self-tapping screws with a press cylinder are sharp made of steel. After manufacturing, a thin layer of zinc is applied to the screws. It protects the screws against corrosion, thus prolonging their service life. The head of self-tapping screws is hemispherical with a press-press. The head has a cross-shaped slot. The sharp tip of the screws is designed for mounting in a base of wood. The presence of the presshead provides the maximum pressure of the sheet material during installation.Self-tapping screws with a press cup with a drill
For the manufacture of self-tapping screws with a press and a drill, steel is used. In addition, the screws are covered with a thin layer of zinc. Zinc coating is an effective protection of screws against corrosion. The tip of the screws with a drill, which allows you to mount in a metal base. The head is hemispherical with a press washer. The head has a cross-shaped slot.
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Mounting features: Self-tapping screws with a press-cup with a drill are used to fix sheet material, such as hardboard, plywood, etc. to metal structures. The presence of a drill bit at the end of the self-tapping screws allows mounting without pre-drilling. Pressing the cushion allows you to effectively press the sheet material to the metal base. Mounting is carried out with a screwdriver or a special drill bit. |
Screws (including press cradles) - this is a small, but extremely necessary detail in the construction and household, reminiscent of a kind of squeezed puck. Without this element, it is very difficult to manage if in the house or apartment it is necessary to fasten the shelf, collect furniture, hang a picture and even more so build an extension. Moreover, the device does not have any analogues, that is, it can not be replaced by any other device.
General information about screws and the scope of their application
There are many types of screws, each of which:
- is intended for use with various building materials;
- has its own technical features;
- it is applied in different spheres of construction.
The most common is a tool, which requires a screw for a screwdriver or a screwdriver to twist it. Details with a press-washer are also popular.
Types of self-tapping screws
Basic views
Wood screw
This type of part is characterized by a rare thread pitch, which is due to the low density and hardness of the wood. Based on the color of the material with which you will work, you can choose a black, white or golden device with a large distance between turns. Most often builders apply black screws, but occasionally you have to pick up the instrument in a tone, for example, during the fastening of a yellow furniture loop.
The length of the self-tapping wood varies from 11 mm (because of their small size they are called seeds in the people) up to 200 mm. Pick it up depending on the size of the part, adjusting the density of the joint of materials. So, when working with two brusks the size of 50 mm each, it is recommended to use a screw with a length of at least 80 mm.
These devices differ in their diameter, which gives them an additional advantage - black parts with a diameter of 3.5 mm and 4.2 mm do not require a twisting pre-drilling. But the diameter of the screws of yellow color is 2.5 mm - 6 mm. If the diameter of the screw is 4.5 mm or more, special holes for them will be required. When using a thin workpiece or bar, it is necessary to make a hole, even for a 4 mm hardware.
Depending on the density of the tree, the size of the hole for the screw is selected. Most often, for a 4.5 mm diameter piece, a hole of 3 mm or 3.5 mm is required, for a 5 mm - 3.5 mm or 4 mm, for a 6 mm - 4.5 mm. With this ratio of parameters wood material does not give cracks. Drills on wood in steps of 0.5 mm do not exist, so employees a standard drill bit for metal is used., but in no case should the hole be made too large, otherwise the adhesion to low density will be ineffective. Proceeding from the diameter of the samorez pick up and screwdriver. When working with yellow details, the bit PZ No. 1, PZ No. 2 or PZ No. 3 is used, and with black bits, a bit or screwdriver with a PH No. 2 connector.
Screws for metal
Unlike the previous detail, this type of instrument is characterized by frequent steps and a small distance between the threads, which provides a reliable grip when working with dense materials. The device of a black color with a diameter of 3.5 mm does not require preliminary drilling, but when working with thin tin can make a hole in advance. For billet thickness of 2.5 mm or more make a hole from 3.2 mm to 3.7 mm, using the connector PH # 2.
Hot-dip galvanized self-tapping screw with presshead
Such a tool with a press cylinder allows to fix a sheet of metal up to one centimeter thick without preliminary drilling a hole, and the large hat serves as a washer and tightly presses the material to be fixed. Self-tapping screws with a press-cup are produced with a diameter of 4.2 mm, a length of 13 mm to 64 mm and a connector PH No. 2.
| 4,2x13 | 1,48 |
| 4,2х14 | 1,53 |
| 4,2х16 | 1,61 |
| 4,2х19 | 1,88 |
| 4,2x25 | 2,21 |
| 4,2x32 | 2,63 |
| 4,2x41 | 3,26 |
| 4,2x51 | 4,29 |
| 4,2x76 | 5,14 |
Screw with a press washer with a drill
Such devices with a press-neck and a drill allow to fix metal in 2 mm also without preliminary boring of an aperture. Wherein at the tip of the part with a drill and a press was fixed a special drill bit, which automatically drills, and then spins. To use the tool, a bit is required with PH connector # 2.
The size and weight in kg (1000 pieces) are respectively presented in the form of a table.
| 4,2x13 | 1,48 |
| 4,2х14 | 1,53 |
| 4,2х16 | 1,61 |
| 4,2х19 | 1,88 |
| 4,2x25 | 2,21 |
| 4,2x32 | 2,63 |
| 4,2x41 | 3,26 |
| 4,2x51 | 4,29 |
| 4,2x76 | 5,14 |
Other types
Roofing screw
This type of tool is designed for fixing various roofing materials and are manufactured with a rubber gasket, which prevents the leakage of the roof. The diameter of the device varies from 4.8 mm to 6.3 mm, and the length - from 1.9 cm to 10 cm. The detail can be ordinary galvanized, blue or brown. When working with the tool use an Allen key 8 mm (if the running diameter is 4.8 mm) or 10 mm (if the diameter of the hardware is 6.3 mm).
Confirmate (furniture tool)
This device length of 5 cm is used for furniture assembly with preliminary drilling. For manual work with the tool, a 4 mm Allen key or HEX 4 bit is required.
Capercaillie (screw with hexagon head)
The part is most often used when working with heavyweight wooden structures, when a special strength of the tool is required. The hole for drilling should correspond to the following ratio: for a screw 6 mm, an opening of 4.5 mm is necessary, for an 8 mm - in 6 mm, for 1 cm - for an 8 mm. To twist the fixture use a wrench, the hexagonal cap should be 1 cm in diameter, 1.3 cm in diameter or 1.7 cm from the thickness of the screw.
Structure of pages:
The self-tapping screw with the press was sharp, it is a steel fastener element with a fine thread pitch, which has a sharp end, used for fastening sheet metal (~ 0.9 mm), and also for fixing various wooden elements such as plywood, MDF, etc. Thanks to the press hemispherical head of hardware, at installation the best fastening of a sheet material with a surface as the clamping force increases. Also, the reliability of the connection is several times higher, since it is practically impossible to push the screw into the material. The head has a cross-shaped slot ph-2 (use a screwdriver or a ph-2 bit for mounting.The use of other bits increases the chance of slippage, which can lead to structural breakage or injury when tightening screws).
Material and coating:
Similar products are made of carbon steel with zinc coating. Thanks to zinc, self-tapping screws with a press cup do not rust, which allows them to be used in conditions of high humidity.
Scope of application:
Sharp screws with a press cylinder are used for installation work, fastening of sheet steel, plywood, MDF, as well as used in finishing works and in the manufacture of various furniture.
Separately it is worth noting that for the installation of metal products are still more suitable, since the installation of such fasteners is greatly facilitated.
Wholesale prices in Moscow:
This fastener corresponds to the fastener element, which is manufactured according to the German standard.
Below are the prices for some sizes of sharp screws, which are manufactured in accordance with the above-mentioned standard:
We draw your attention to the fact that due to the unstable exchange rate, the prices for the goods can vary. We recommend preliminary checking the current prices of our managers.
| Name and size: | Price: |
|---|---|
| Screw sharp d2,9x 6.5 zn C-H | 0.34 rubles. |
| Screw sharp d2,9x 6,5 zn C-Z | 0.63 rubles. |
| Screw sharp d2,9x 9,5 zn C-H | 0.31 rubles. |
| Screw sharp d2,9x13 zn C-Z | 0,92 rub. |
| Screw sharp d3,5x 6,5 zn C-Z | 0.38 rubles. |
| Screw sharp d3,5x13 zn C-H | 1.35 rubles. |
| Screw sharp d4,2x 9,5 zn C-Z | 1.55 rubles. |
| Screw sharp d4,2x25 zn C-H | 1.93 rubles. |
| Screw sharp d4,8x 9,5 C-Z zn | 2.30 rubles. |
| Screw sharp d4,8x13 zn C-Z | 2.92 rubles. |
| Screw sharp d4,8x19 C-H zn | 3.04 rubles. |
Sharp screws with a press-tube are made of alloy steel. Their surface is galvanized, often with white passaging. This provides anti-corrosion protection fasteners , their durability and decorative appearance.
Distinctive features of sharp self-tapping screws with a press-head
From other hardware of this group, such fasteners are characterized by the following design features:
- Pointed tip. It allows you to screw sharp galvanized self-tapping screws with a press cup without preliminary perforation of holes in the materials to be joined;
- Presence of a presshead on the head. It ensures maximum tightness of sheet materials during connection. This allows achieving high strength and reliability of fixation.
Sphere of application of sharp self-tapping screws with a press-head
The most frequently used self-tapping screws with a press-forging on wood. This can be a variety of wooden elements, plywood, MDF, etc. The presence of a presshead allows to prevent the punching of such materials without compromising the reliability of the connections. For metal surfaces are used self-tapping screws with a press cup with a drill.
Also, you can buy sharp screws with a press cup for bonding hardboard, thin steel, or other sheet materials (including plastic sheathing) up to 1 cm thick. Often, similar hardware is used to organize combined attachments (for example, when attaching thin metal elements to a wooden frame).
The main advantages of using sharp self-tapping screws with a press-head
Ease of installation.
Using sharp wood screws, you do not have to pre-make holes in the material. All you need is a tool designed for a Philips type 2 head.
High speed of work execution.
It is provided by eliminating an additional stage (drilling holes). To maximize the speed of installation work, it is recommended to use electric tools (for example, screwdrivers).
A wide range of.
On sale there are sharp self-tapping bug (up to 1.1 cm in length) and larger hardware with a press tube, which allows you to choose fasteners for a certain thickness of the materials to be joined.
The price of sharp self-tapping screws with a press-tube is directly dependent on the materials of their manufacture (steel grade, type of protective coating) and dimensions. The company-manufacturer also matters. To save money, you can buy hardware in large batches (in packages of several hundred pieces).