250 Countersunk Wood Decking Screws – Inox – 4.8x100/60 – TX20 – SK Drill

Professional fastening for heavy timber construction

Engineered for reliability and aesthetic excellence, these 100 mm stainless steel screws are the ideal solution for builders working on thick decking boards or structural timber frames. The high-grade acid-resistant steel prevents unsightly discoloration on both the screw head and the surrounding wood, preserving the natural beauty of your project. With a high tensile strength of 700 N per mm2, these screws provide the structural integrity required for long-lasting outdoor installations.

Advanced features for material integrity and ease of use

The SK Drill design incorporates several technical innovations to simplify installation and protect the timber:

• Anti-fissure technology: An integrated notch at the start of the thread acts to relieve internal tension as the screw enters. This effectively prevents cracks and splits, even in dense wood, without the strict necessity of pre-drilling.

• Self-countersinking head: Integrated milling ribs located under the countersunk head ensure that the screw sinks easily and cleanly into the wood. This creates a smooth, flush surface that is perfect for barefoot terrace areas.

• Stable driving experience: The TX20 (Torx) six-lobe internal drive system provides a secure, wobble-free connection. This allows for safe and precise driving from the moment the screw is placed until it is fully seated.

• Deep anchoring: With a 60 mm thread length on a 100 mm body, these screws offer superior grip and pull-down force, making them ideal for securing thick timber members to structural joists.

Key advantages:

• Acid-resistant stainless steel: No rust and no wood staining for a clean, long-term finish.

• Split prevention: Thread notch reduces stress in the timber fibers.

• High traction: TX20 drive for a secure, slip-free installation.

• Professional aesthetics: Milling ribs for an effortless and clean countersunk finish.

Technical characteristics

• Quantity: 250 pieces

• Diameter: 4.8 mm

• Total length: 100 mm

• Thread length: 60 mm

• Head type: Countersunk with milling ribs

• Head diameter: 8.1 mm

• Head height: 3.8 mm

• Drive type: TX20 (Torx)

• Material: Acid-resistant stainless steel

• Tensile strength: 700 N per mm2

Professional tips

• Pre-drilling advice: Although designed for use without pre-drilling, it is always recommended to perform a test on a scrap piece of your specific timber. For very hard or brittle exotic woods, pre-drilling can ensure an even cleaner finish.

• Depth uniformity: Use a drill with a depth-stop setting to ensure all screw heads are perfectly flush across the entire surface for a uniform, high-end look.

• Bit maintenance: Ensure you use a high-quality TX20 bit (note: ensure bit size matches the TX20 drive) to maintain a perfect fit and prevent any damage to the stainless steel drive during high-torque applications.

• Structural spacing: Place screws at least 15 mm to 20 mm from the edge of the boards to maximize the holding power and prevent any risk of edge splitting.