Wood screws Koelner 4.2x70 mm phosphated for wood, container pack B-SL-FT-4270

Koelner 4.2x70 mm phosphated wood screws in a container pack are designed for fastening wooden elements where medium-length, reliable fasteners are required. These screws have a 4.2 mm nominal diameter and a 70 mm length, with a phosphated surface treatment that provides basic corrosion resistance and reduces friction during driving. Supplied in a convenient container pack, they are intended for routine construction, carpentry, furniture assembly and general woodworking tasks.

Advantages

The phosphated finish offers improved protection against surface rust compared with untreated steel and helps lubricate the threading for easier screw driving. The 4.2 mm diameter combined with 70 mm length provides sufficient hold in common soft and hardwoods for structural and finishing applications. The container pack keeps screws organized on site and reduces handling time during installation.

Suitable for

• Joining timber framing and studs
• Furniture assembly and repairs
• Fitting wooden panels and cladding
• Decking substructure and general carpentry

Key specifications

• Diameter: 4.2 mm (nominal)
• Length: 70 mm
• Surface treatment: phosphated for basic corrosion resistance
• Head and drive type: designed for common screwdrivers or bits (compatible with standard drives)
• Material: steel
• Packaging: container pack for on-site storage and handling

How to use

Select an appropriately sized pilot hole where required for the wood species and screw diameter to prevent splitting, especially in hardwoods or near board edges. Use a compatible screwdriver or bit and apply steady pressure while driving the screw to avoid cam-out. For repeatable results, clamp workpieces and align fasteners before driving. Where greater corrosion resistance is necessary, consider using coated or stainless fasteners instead of phosphated screws.

Usage recommendations

For optimal performance, pre-drill pilot holes in dense hardwoods and near edges, and use a torque-controlled driver to prevent overdriving. Store the container pack in a dry place to maintain the phosphated surface and ease of handling on site.