2. Core features
self-drilling ability
The screw tip has a drill-like structure, which can drill holes on the metal surface by itself without pre-drilling, saving time and tools.
Different specifications correspond to different penetration thicknesses (for example, BSD point drill bits are suitable for thin plates, and CSD cone drill bits are suitable for thicker plates).
self tapping thread
The thread design is sharp, and the internal thread is directly tapped after drilling to achieve integrated fastening.
3. High hardness material
Usually carbon steel (surface galvanized, phosphated) or stainless steel (such as 304, 316) is used, which has high hardness and strong wear resistance.
Head diversification
Pan head, hexagonal head, trumpet head, etc., suitable for different scenarios:
Hexagonal flange head: Provides greater torque and prevents loosening.
Horn head + sealing gasket: used in waterproof scenarios (such as roofs).