5.0-12x50 Zinc-Nickel Alloy Square Drive Flat Head Self-drilling Screw

Product Features
Strong Specification Adaptability: 5.0mm rod provides balanced load capacity; 12-thread coarse thread pitch is deeper, offering strong engagement with plates that resists stripping. 50mm total length fits multi-layer composite substrates up to 42mm thick, providing excellent fixation for mixed steel-wood panels.
Square Drive Flat Head Dual Advantage: Internal square drive slot bears stress evenly, resisting stripping under high-power electric tightening. It can only be removed with a specialized bit, providing an anti-theft effect. The countersunk design ensures the panel surface is flat with no protrusions after locking, preventing water accumulation and snagging, balancing aesthetics and waterproofing.
Efficient Self-Drilling Construction: Drill tail features a cutting edge and chip-clearing flute, allowing direct penetration of thin steel plates and color steel plates without pre-drilling, simplifying construction steps and significantly increasing installation efficiency.
Outstanding Anti-Corrosion: Zinc-nickel alloy coating provides salt spray and acid/alkali resistance far superior to standard galvanized screws. Low hydrogen embrittlement process suits high-strength carbon steel, preventing rust in long-term outdoor exposure or coastal salt spray environments and significantly extending service life.
Stable Mechanical Performance: Balanced hardness/softness ratio of base material: sufficient drill-tail hardness for cutting, and rod toughness to provide high pull-out resistance, ensuring no breakage or loosening during long-term use.