12-11x40 AS3 Hex Head (Reduced Shank) Self-drilling Screw

Product Features
Hex Flange Head: Compatible with socket tools; high torque without slipping. The flange surface with a waterproof washer ensures roof installation prevents water leakage and avoids crushing color steel plates.
Reduced-Tail Thread Design: Small-diameter transition at the tip prevents wood splitting during drilling; smooth chip removal, low entry resistance, and higher pull-out strength after the steel-wood combination.
11-Type Specialized Drill Tail: Can penetrate 0.4–3mm thin steel plates in one go while tapping into wood—dual steel-wood capability that reduces the need for multiple inventory types.
Australian 3rd-Class Long-Term Anti-Corrosion: Triple-layer weather-resistant coating resists ultraviolet light, acid rain, and mild salt spray, making it rust-resistant for long-term outdoor inland use.
High-Strength Base Material: Overall hardening treatment ensures the drill tip is wear-resistant and doesn't break, while the rod offers excellent toughness, suitable for high-frequency installation on construction sites.