8-18x20-35mm Carbon Steel Zinc Yellow (Z/Y) Countersunk Head with Wings Self-drilling Screw

Product Features
Self-Drilling & Tapping, One Step: Features a hardened drill-tail tip, allowing direct penetration of thin plates without pre-drilling, completing drilling, tapping, and fastening in one go, significantly increasing efficiency and saving labor costs.
Countersunk Design, Flush Surface: The conical Phillips countersunk head can be completely embedded into the workpiece surface, ensuring no protrusions after installation, which maintains aesthetics and avoids interference with subsequent processes.
8 Strengthening Ribs, Anti-Loosening/Sliding: The eight strengthening cutting ribs under the head increase engagement with the plate, preventing slippage or misalignment during installation and improving connection stability and reliability.
Color Zinc Coating, Rust-Resistant & Durable: Surface treated with color zinc passivation for excellent neutral salt spray performance, effectively resisting rust in general environments and extending product lifespan, suitable for various indoor and outdoor scenarios.
Comprehensive Specifications: 8-18 thread type paired with a 20-35mm length range, allowing for flexible selection based on different plate thicknesses to meet various connection needs.