Koelner FS-3525 Drywall Screws for Gypsum Boards and Profiles 3.5x25mm, 1000 pieces

Koelner FS-3525 drywall screws are professional-grade fasteners specifically engineered for the secure installation of gypsum boards onto metal or wooden framing profiles. Measuring 3.5x25mm, these screws are designed to provide optimal holding power in interior construction environments. The pack includes 1000 pieces, ensuring a sufficient supply for large-scale renovation or building projects.

Advantages

These drywall screws feature a sharp, hardened point that allows for rapid penetration into both light-gauge metal profiles and wooden studs, significantly reducing installation time. The countersunk head design ensures that the screw sits flush with the surface of the gypsum board, creating a smooth finish that is easy to cover with joint compound or paint. The high-quality steel construction provides excellent resistance to snapping during driving, while the specialized coating offers protection against corrosion in standard indoor conditions.

Suitable for

• Fastening gypsum plasterboards to metal profiles
• Attaching drywall panels to wooden battens
• Interior wall partition construction
• Ceiling installation projects
• General renovation and drywall repair

When it may not be suitable

These screws are not intended for use in exterior environments where they may be exposed to moisture or harsh weather conditions, as they lack the specialized anti-corrosion coatings required for outdoor applications. Additionally, they are not suitable for fastening heavy materials to masonry or concrete surfaces without the use of appropriate wall plugs.

Key specifications

• Dimensions: 3.5mm diameter by 25mm length
• Head type: Countersunk
• Point type: Sharp
• Quantity: 1000 pieces
• Application: Gypsum boards to metal or wood

How to use

To use these screws, ensure you are using a compatible screwdriver or a power drill equipped with a drywall depth-control bit. Position the gypsum board firmly against the profile. Drive the screw through the board and into the underlying profile until the head is slightly recessed below the surface of the board, taking care not to break the paper layer of the gypsum. Repeat this process at recommended intervals along the studs to ensure structural integrity.

What to consider before purchase

• Verify the thickness of your gypsum board to ensure 25mm length is appropriate
• Check the material of your profiles to ensure compatibility with sharp-point screws
• Calculate the total number of screws needed based on the spacing requirements of your project
• Ensure you have a screwdriver with a depth-limiting attachment for a professional finish

Usage recommendations

For the best results, maintain a consistent screw spacing of approximately 20 to 30 centimeters along the profiles. Always ensure the screw is driven perpendicular to the board surface to maximize holding strength and prevent damage to the gypsum core.