Self-tapping screw on metal with a press washer: see, technical characteristics and sizes
Self-tapping screw (including with a press washer) - it's small, but an essential detail in construction and everyday life, resembling a crushed washer. It is very difficult to do without this element, if in the house or apartment it is necessary to fix the shelf, assemble furniture, hang a picture and even more so to build an extension. Moreover, the device does not have any analogues, that is, it cannot be replaced by any other device.
General information about self-tapping screws and their scope
There are many types of screws, each of which:
- designed for use with various building materials;
- has its own technical features;
- used in various fields of construction.
The most common is a tool for twisting which requires bits for a screwdriver or screwdriver. Also popular details with a press washer.
Types of self-tapping screws with a press washer
The main types
Self-tapping screw on a tree
This type of part is characterized by a liquid thread pitch, due to the low density and hardness of wood. Based on the color of the material, which will have to work with, you can choose black, white or gold device with a large distance between turns. Most often, builders use black screws, however, you periodically have to select the instrument tone, example, when fixing the yellow furniture hinge.
The length of the screws on the wood varies from 11 mm (due to their small size, they were popularly called seeds) to 200 mm. Select it depending on the size of the part, adjusting the bond density of materials. So, when working with two bars the size of 50 mm each, it is recommended to use a self-tapping screw at least 80 mm.
These devices also differ in diameter, which gives them an additional advantage - black parts in diameter 3,5 mm and 4,2 mm do not require pre-twisting when twisting. But the diameter of the yellow screws is 2,5 mm - 6 mm. If the diameter of the screw is 4,5 mm and more, special holes will be needed for them. When using a thin workpiece or bar, you need to make a hole even for the hardware 4 mm.
Depending on the density of the wood, select the size of the holes for the screw. Most often for parts with a diameter 4,5 mm required hole 3 mm or 3,5 mm, 5 mm - 3,5 mm or 4 mm, 6 mm - 4,5 mm. At this ratio, the wood material does not crack. Drills on wood step by step 0,5 mm does not exist, therefore, workers use a standard drill for metal, however, in no case should the hole be made too large, otherwise low-density traction will be ineffective. Based on the diameter of the screw and select a screwdriver. When working with yellow parts, the PZ №1 bit is used, PZ №2 or PZ №3, and with black, a bit or screwdriver with a PH №2 connector.
Self-tapping screw on metal
Unlike the previous detail, this type of tool has a frequent pitch and a small distance between the turns of the thread, which provides reliable adhesion when working with solid materials. The device is black in diameter 3,5 mm does not require pre-twisting, however, when working with a thin plate, you can make a hole in advance. For thick workpieces 2,5 mm and more make a hole from 3,2 mm to 3,7 mm, using the pH connector №2.
Sharp galvanized screw with washer
This tool with a press washer allows you to fix a sheet of metal up to one centimeter thick without pre-drilling a hole, and the big hat serves as a washer and tightly presses the fixed material. Self-tapping screws on metal with a press washer let out in diameter 4,2 mm, length from 13 mm to 64 mm and PH connector №2.
Size and weight in kg (1000 PC.) respectively presented in the form of a table.
| 4,2х13 | 1,48 |
| 4,2x14 | 1,53 |
| 4,2x16 | 1,61 |
| 4,2x19 | 1,88 |
| 4,2x25 | 2,21 |
| 4,2x32 | 2,63 |
| 4,2х41 | 3,26 |
| 4,2х51 | 4,29 |
| 4,2х76 | 5,14 |
Self-tapping screw with a press washer with a drill
Such devices with a press washer and a drill allow to fix metal 2 mm also without pre-drilling a hole. At the same time on a tip of a detail with a drill and a press washer the special drill is fixed, which automatically performs drilling, and then twists. You need a PH №2 bit to use the tool.
Size and weight in kg (1000 PC.) respectively presented in the form of a table.
| 4,2х13 | 1,48 |
| 4,2x14 | 1,53 |
| 4,2x16 | 1,61 |
| 4,2x19 | 1,88 |
| 4,2x25 | 2,21 |
| 4,2x32 | 2,63 |
| 4,2х41 | 3,26 |
| 4,2х51 | 4,29 |
| 4,2х76 | 5,14 |
Other types
Roofing screw
This type of tool is designed for mounting various roofing materials and is available with a rubber gasket, which prevents the roof from leaking. The diameter of the device varies from 4,8 mm to 6,3 mm, and length - from 1,9 see to 10 div. The part can be plain galvanized, blue or brown. When working with the tool use a bit with an internal hexagon 8 mm (if the running diameter 4,8 mm) or 10 mm (if the diameter of the hardware is 6,3 mm).
Confirmation (furniture tools)
This is a length device 5 cm used to assemble furniture with pre-drilling. A hex key is required for manual operation of the tool 4 mm or bit HEX 4.
Glukhar (hexagon head screw)
The part is most often used when working with heavy wooden structures, when special tool strength is required. The twist hole should correspond to the following ratio: for the screw 6 mm required a hole in 4,5 mm, 8 mm - 6 mm, for 1 cm - 8 mm. Use a wrench to tighten the device, hexagonal hat should be in diameter 1 cm, 1,3 see or 1,7 cm based on the thickness of the screw.
If a dowel tool is used, the diameter of the latter should be about twice the size of the screw. The hole on the work surface must match the diameter of the dowel.
Conclusion
Self-tapping screw with a press washer - a useful and even indispensable thing in construction. The scope of this device is quite high, and reliability leaves no doubt. Unique details with a press washer with a drill are especially popular among builders.
The main positive properties of this tool:
- lack of analogues;
- ease of use;
- wide scope of application;
- reliability and durability.
