Flat Head Self Drilling Screw 4.2mm × 35mm Product

The 4.2mm × 35mm Flat Head Self Drilling Screw is a flat head self-drilling screw suitable for thin metal sheets, light steel structures, aluminum profiles, roof accessories and hardware assembly applications. Designed with a self-drilling tip, it can drill into and fasten matching materials in one go, eliminating the pre-drilling process and boosting on-site installation efficiency. Its flat head leaves a smooth surface after installation, making it ideal for assembly positions with strict requirements on appearance, fitting tightness or subsequent overlay layers. This size is widely used in engineering installation, building hardware, metal frame connection, light structure fixing and mass assembly projects. The 4.2mm diameter delivers a balanced holding force and easy installation, while the 35mm length fits connection scenarios requiring sufficient penetration depth and reliable fixing stability.