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Countersunk self tapping screw is a type of self tapping screw with tapered pins that can be used to secure two different materials. Its biggest feature is a sharp needle and a hemispherical countersunk head. Its structural characteristics determine that it is easy to enter wood or other soft materials, and under the action of torque, it automatically enters the material and is firmly fixed.

Truss screws can be basically divided into two types: cutting truss screws and forging truss screws. Cutting truss screws is achieved by cutting raw materials into fixed shapes and then machining them. Therefore, their external shape is regular. The forged truss screws are forged by heating the metal and using a forging machine. This means that the shape of the forged truss screws may be more complex.

Cross pan head self tapping screw is a common installation screw with a cross shaped head that can be easily tightened with a screwdriver. The main feature of this type of screw is its self drilling head, which means it can directly penetrate the material during installation, ensuring a fixed effect.

Pan head screws have a slot and a cross slot for selection. If an electric screwdriver is used for installation, a cross slot is generally chosen.

Countersunk self tapping screw is a type of screw with a special spiral groove. Its head is designed to be flat and has many toothed structures on the surface, allowing it to self drill into the material surface and form a firm fixation. Countersunk self tapping screws are widely used for fixing various materials, such as steel, copper, aluminum, wood, and so on.

The tail of the drill tail screw is in the shape of a drill tail or pointed tail, without the need for auxiliary processing. The drill tail screw can be directly drilled, tapped, and locked on the set material and basic material, greatly saving construction time. Drilled tail screws are more common screws, with higher toughness and maintenance force. After being combined for a long time, they will not loosen, and the use of safe drilling and tapping is easy to complete in one operation.

The purpose of drilling tail screws is: it is a type of wooden screw, mainly used for fixing colored steel tiles in steel structures, and can also be used for fixing thin plates in simple buildings. It cannot be used for metal to metal bonding fixation.