Koelner B-FS3535 Phosphate Coated Screws for Steel 3.5x35mm

The Koelner B-FS3535 phosphate coated screws are precision-engineered fasteners designed specifically for secure attachment to steel structures and metal profiles. Measuring 3.5x35mm, these screws feature a specialized phosphate coating that serves a dual purpose: it provides essential protection against corrosion and creates an ideal surface texture for the adhesion of paints, plasters, or other finishing materials. These screws are built to meet the demands of professional construction environments, ensuring consistent performance and structural integrity in various metal-to-metal or board-to-metal applications.

Advantages

The primary benefit of these screws lies in their high-quality phosphate finish, which significantly enhances resistance to environmental factors while ensuring that subsequent layers of finishing materials bond effectively to the surface. The sharp point and thread design allow for rapid penetration into steel elements, reducing the time required for installation. Furthermore, the robust construction of the steel material ensures that the screws maintain their shape and holding power under tension, providing a reliable solution for long-term assembly projects.

Suitable for

• Fastening gypsum boards to metal profiles
• Assembling light steel frame structures
• General construction tasks involving thin-gauge steel
• Interior finishing work requiring a secure metal-to-metal connection

When it may not be suitable

These screws are not intended for use in highly corrosive environments, such as marine or coastal areas, where stainless steel fasteners would be required. They are also not suitable for heavy-duty structural steel connections that require high-tensile bolts or specialized anchoring systems.

Key specifications

• Dimensions: 3.5mm diameter by 35mm length
• Material: Carbon steel with phosphate coating
• Application: Steel profiles and metal structures
• Finish: Phosphate for improved adhesion and corrosion resistance

How to use

To achieve the best results, use a power screwdriver with an adjustable depth control to prevent over-driving the screw into the material. Position the screw perpendicular to the surface of the metal profile and apply steady pressure while driving. Ensure the screw head is flush with the surface of the material being fastened to maintain structural stability. If working with thicker steel profiles, pre-drilling may be necessary to prevent damage to the screw thread or the metal surface.

What to consider before purchase

• Verify the thickness of the metal profiles to ensure the 35mm length is appropriate for your specific application.
• Check the compatibility of your power tool bits with the screw head type.
• Ensure the environment is suitable for phosphate-coated steel to avoid premature oxidation.

Usage recommendations: Always wear appropriate personal protective equipment, including safety glasses, when driving screws into metal. Store the screws in a dry environment to maintain the integrity of the phosphate coating until the moment of installation.