Wing design in self-drilling screws: Anti-crack performance with enhanced countersunk finishing
In applications involving cement board, wood, and polycarbonate sheets, one of the biggest challenges is material cracking and surface deformation during fastening.
To solve this, self-drilling screws are engineered with a “wing” design – a small feature with significant technical impact.
The wings are located near the drill tip and function as follows:
- When drilling through soft materials (wood, cement board, plastic):
→ Wings enlarge the hole beyond the screw diameter - When reaching steel:
→ Wings break off, allowing the drill point to penetrate steel
Result: Upper layer is stress-relieved and base structure remains securely fastened
Core benefits of the wing design
- Stress reduction – prevents cracking: Larger hole reduces pressure during fastening → minimizes cracking in boards and plastics.
- Thermal expansion allowance (polycarbonate): Allows movement due to temperature changes → prevents long-term cracking.
- Improved fastening accuracy: Ensures proper thread engagement into steel → stronger connection.
- Faster installation: No pre-drilling required → fewer steps → higher efficiency.
Supports countersunk finishing (hidden screw head)
The enlarged hole created by the wings allows:
- The screw head to sit below the surface
- When combined with a countersunk head design
→ results in a smooth and flush finish
✔️ Especially important for: Cement board flooring, wood panels and interior finishing applications
Without wing design
- Smaller hole → higher stress
- Increased risk of cracking
- Screw head remains protruding
- Poor surface finish
The wing design is more than a drilling aid – it delivers both structural and finishing benefits:
✔️ Reduces material stress
✔️ Enables thermal expansion
✔️ Supports countersunk (flush) finishing
✔️ Enhances overall construction quality
A critical solution for modern cemboard, wood, and polycarbonate systems.