In the construction industry, countersunk screws are often used. They can go deep under the surface of objects to maintain the flatness of the surface of the object being nailed. Their shapes include quincunx, cross, straight, hexagonal, etc.
How to use it:
Countersunk screws are generally used for fastening after installation. There are two kinds of thick and thin screws. After tightening thick screws, some threads will not enter the threaded hole. In this case, it can be determined that the screws can be tightened.
In addition, there is a thin one. Because of its small thickness, the screw becomes a tapered hole after passing through the hole. Therefore, when you feel that the screw has been tightened, it is not actually tightened.
Precautions:
1. When reaming, the taper should be 90 degrees. If 90 degrees cannot be guaranteed, the taper should be less than 90 degrees as far as possible.
2. If the thickness of the specified item is thinner than the head of the screw, it is recommended to select a countersunk screw with a smaller size or make the counterbore smaller.
3. If more than one countersunk screw is required on the part, avoid drilling deflection to avoid the appearance of the outer edge after assembly.