whole wholesale washer drill tail screw large flat head drill tail screw dovetail self-tapping screw colored steel tile screw screw 整件批发华司钻尾丝大扁头钻尾螺丝螺钉燕尾自攻丝彩钢瓦螺丝螺钉

The tail thread is also called‌Self-drilling screws, self-tapping screws with drilled tailsThe front end comes with a drill bit, eliminating the need for pre-drilling. It allows direct drilling, tapping, and locking in one step. It is primarily used for connecting metal thin sheets such as steel structures, color steel tiles, and light steel frames. It saves a lot of effort compared to regular screws.

🔩 Basic Features

• <t_XXXXXXXXX> </t_XXXXXXXXX>No pre-perforation requiredThe tail is drill-shaped or pointed, allowing it to penetrate metal sheets simply by twisting, eliminating an additional process.
• <t_XXXXXXXXX> </t_XXXXXXXXX>Strong connectionThe tensile strength and retention force are higher than those of ordinary screws, and they are not likely to loosen over time.
• <t_XXXXXXXXX> </t_XXXXXXXXX>Common Materials: Carbon steel, stainless steel (304, 410, etc.), generally treated with anti-rust methods such as galvanizing or Dacromet on the surface.
• <t_XXXXXXXXX> </t_XXXXXXXXX>Common SpecificationsDiameters are Φ4.2, Φ4.8, Φ5.5, and Φ6.3 mm; length can be customized according to requirements.

⚠️ Usage Instructions

• Suitable mainly for metal sheets and wooden structures, generally.Not recommended for load-bearing connections between metals.‌。
• For use in outdoor or humid environments, it is best to choose high-corrosion-resistant products with hot-dip galvanizing or Dacromet coating; standard galvanizing tends to rust easily.
• A drill is required during installation. The speed should be adjusted according to the screw size and material. Keep it vertical while tightening, and stop the drill immediately after reaching the correct position to prevent slipping or drilling through.