VIS AUTOPERCEUSE TETE HEXAGONALE

Select the Appropriate Hex Head Self-Drilling Screw in Consideration of the Type of Materials to Be Connected 

Metal material
If connecting metal materials, such as steel or aluminum, hex head self-drilling screws with matching material strength should be selected. For ordinary low-carbon steel members, hexagon self-drilling screws made of carbon steel can usually meet the requirements. However, if it is connected with stainless steel structure, in order to prevent electrochemical corrosion, it is best to choose hexagon self-drilling screws made of stainless steel (such as 304 or 316 stainless steel). For example, in the installation of stainless steel kitchen equipment, 316 stainless steel hex head self-drilling screws can provide good corrosion resistance and sufficient connection strength.

Also consider the thickness of the metal material. For a thin metal plate (less than 3mm in thickness), you can choose a smaller hex head self drilling metal screws, such as 4-5mm in diameter, so as to avoid excessive penetration and damage to the material. For thicker metal materials (thickness greater than 3mm), hex head self drilling metal screws with larger diameter (such as 6-8mm) and longer length may be needed to ensure firm connection.

Woody material
When used in wood materials, it should be selected according to the hardness of wood. For cork (such as pine), hexagon self-drilling screws made of ordinary carbon steel or alloy steel can be drilled and fixed well. However, for hardwood (such as oak and walnut), it may be necessary to have a hexagonal head self-drilling screw with higher hardness after special heat treatment to prevent the screw from breaking during drilling. In addition, it is also important to consider the humidity of wood. In the environment with high humidity, it is recommended to choose hex head self-drilling screws with good antirust performance, such as galvanized screws, to prevent rust.

Composite material
For composite materials (such as fiber reinforced plastics), hexagonal head self-drilling screws with sharp drill points and fine threads should be selected. The sharp drill tip can reduce the damage to the fiber structure of the composite material, and the fine thread can be better combined with the composite material. At the same time, attention should be paid to avoid selecting screw materials that may react chemically with composite materials. For example, some metal screws containing components that will corrode composite materials are not suitable, while stainless steel or specially coated screws may be a better choice.

Select the Suitable Hex Head Self-Drilling Screw Considering the Stress of the Application Scene 

Scenes dominated by axial tension
If the connecting structure mainly bears axial tension, such as the installation of hanging lamps or the fixing of billboards in the vertical direction, it is necessary to choose hexagon self-drilling screws with high axial tension strength. At this time, the material strength, thread depth and diameter of the screw can be considered. Generally speaking, hex head self-drilling screws with large diameter, deep thread depth and high material strength can bear greater axial tension. For example, in the installation of large billboards, selecting hexagon self-drilling screws with a diameter of more than 8mm and made of high-strength alloy steel can effectively resist the axial tension caused by wind load and other factors.

Shear-dominated scene
For scenes that mainly bear shear force, such as the fixing of mechanical transmission parts or the connection between the cross beam and the column of the shelf, we should pay attention to the selection of hexagon self-drilling screws with good shear strength. The diameter and material of the screw have great influence on the shear strength. In this case, short and thick hex head self-drilling screws can usually be selected, because they are more advantageous in bearing shear force. For example, in the fixing of mechanical transmission belt pulley, the short hexagon self-drilling screw with a diameter of 6-8mm can provide enough shear strength to prevent the pulley from shifting during operation.

Application in vibration environment
In the scene of vibration, such as the fixing of automobile engine parts or the installation of damping base of industrial equipment, besides considering the strength factor, it is necessary to choose hexagon self-drilling screws with good anti-loosening performance. Hex head self-drilling screws with nylon washer or thread locking agent coating can be used. These additional anti-loosening measures can effectively maintain the fastening state of screws in vibration environment and prevent the connection from loosening. For example, in fixing the intake manifold of an automobile engine, the hex head self-drilling screw with nylon washer can reduce the risk of looseness caused by engine vibration.

Considering the Installation Environment and Requirements, Select the Appropriate Hex Head Self-Drilling Screw 

Space restriction
If the installation space is limited, it is necessary to choose the appropriate length and head size of hex head self-drilling screw. For example, in the internal structure fixing of some electronic equipment, due to the small space, it may be necessary to choose a self-drilling screw with a small head (such as a thin hexagonal head) and a short length to avoid interference with other electronic components. At the same time, the operating space of the wrench should also be considered to ensure that there is enough space for installation with a hexagonal wrench or a socket wrench.

Installation speed requirements

For scenes that require high installation speed, such as large-scale building construction or industrial assembly line production, hexagon self-drilling screws that are easy to install quickly can be selected. For example, a hex head self-drilling screw with a self-tapping tip and a thread design that facilitates rapid drilling of materials can improve the installation efficiency. In the installation of building external wall panels, this type of hexagon self-drilling screws can quickly fix the wall panels on the keel, saving construction time.

Environmental conditions
Consider the temperature, humidity, corrosiveness and other factors of the installation environment. In the high temperature environment, it is necessary to ensure that the material properties of the selected hex head self-drilling screws will not be degraded due to high temperature, such as choosing alloy steel screws with good high temperature resistance. In humid or corrosive environment, such as the installation of building facilities or chemical equipment on the seashore, stainless steel with high corrosion resistance or hex head self-drilling screws with hot dip galvanizing should be selected to prolong their service life.