Appearance and StructureHead Shape: Designed with a countersunk head, flat-shaped, with a cross recess on the top surface to facilitate tightening using a Phillips screwdriver or electric screwdriver. After tightening, the screw head can be flush with the surface of the connected material, keeping the surface smooth and aesthetically pleasing.Screw Rod: The screw rod has threads with moderate depth and uniform pitch, ensuring smooth tapping after drilling and providing reliable fastening strength.Tail Shape: The tail is drill-pointed or tapered, with sharp cutting edges, allowing direct drilling into materials like metal, wood, or plastic without pre-drilling.Material and Surface TreatmentMaterial: Common materials include carbon steel, wrought iron, and stainless steel. Carbon steel screws are hard and cost-effective but have poor rust resistance; wrought iron has better rust resistance than carbon steel but less than stainless steel; stainless steel offers strong rust resistance but is more expensive.Surface Treatment: Electroplating with zinc forms a uniform zinc layer on the screw surface, effectively enhancing corrosion resistance and preventing rust, suitable for outdoor or humid environments. Zinc coatings are available in colors such as blue-white or rainbow zinc, which can be chosen according to actual needs and environmental requirements.SpecificationsDiameter: Available in Φ3.5, Φ4.2, Φ4.8, Φ5.5, Φ6.3, etc., suitable for different material thicknesses and strengths.Length: A wide range of lengths, generally from a few millimeters to over a hundred millimeters, can be selected according to specific installation needs.Performance FeaturesSelf-Drilling and Self-Tapping: No need for pre-drilling and tapping, can drill, tap, and fasten directly on the material, completing installation in one step, greatly saving construction time and improving work efficiency.Secure Connection: Compared with ordinary screws, self-drilling screws have higher pull-out and holding strength, ensuring that the connection will not loosen over time and providing reliable and stable fastening.Application FieldsPrimarily used for fixing color steel tiles in steel structures, also suitable for fixing thin sheets in simple buildings, such as light steel keel ceilings, metal roofing, and wall decoration. Widely used in construction decoration, furniture manufacturing, and automotive industries. … 

2025-10-18