Corrosion-resistant C4/C5 structural screws for
demanding outdoor and indoor applications
The screws are CE marked, and ETA approved (ETA-12/0471), ensuring their suitability for load-bearing structures. The innovative Ultra double coating provides a high level of
corrosion resistance in corrosivity categories C4 (VH) / C5 (H).
The Ultra C4/C5 range is designed for professional builders who demand reliable performance, long service life and easy installation from their fasteners.
Fast and effortless installation
The SmartFix tip of Ultra screws bites immediately into the wood, eliminating the need for pre-drilling. The asymmetric thread and integrated milling ribs along the shank reduce the required driving torque, saving battery power and reducing strain on the installer. The installation process is faster and smoother, while the internal Torx drive ensures excellent bit grip and controlled fastening.
The strong large washer head provides a wide bearing surface, making it ideal for structural framing and load-bearing connections
• Large washer-type head increases strength and keeps materials securely in place
• SmartFix tip and asymmetric thread ensure reliable grip
• Ultra coating and internal Torx drive
Size range: Diameters 6–8 mm, lengths 40–240 mm, head diameter 15 or 20 mm
Suitable for:
Load-bearing joints
Structural timber
Heavy-duty structures
Garden and landscaping construction
