Koelner FT-3535 Phosphate Coated Drywall Screw for Wood Framing 3.5x35mm 1000 pcs

The Koelner FT-3535 phosphate-coated drywall screw is a specialized fastener engineered for the secure attachment of gypsum plasterboard panels to wooden framing structures. Measuring 3.5x35mm, these screws are designed to provide a reliable hold in residential and commercial interior finishing applications. The phosphate coating offers a basic level of corrosion resistance, making them suitable for standard indoor environments where moisture levels are controlled.

Advantages

These screws feature a precision-engineered sharp point that allows for rapid and effortless penetration into wooden studs, significantly reducing the time required for installation. The trumpet head design ensures that the screw sits flush with the surface of the drywall without damaging the paper layer, providing a smooth finish that is easy to cover with joint compound. The durable phosphate finish provides a consistent surface that adheres well to finishing materials, while the robust steel construction ensures long-term structural integrity for wall and ceiling assemblies.

Suitable for

• Mounting gypsum boards to wooden wall frames
• Installing plasterboard on wooden ceiling joists
• General interior renovation and construction projects
• Professional drywall installation tasks

When it may not be suitable

These screws are not intended for use in outdoor environments or areas with high humidity, as the phosphate coating does not provide sufficient protection against rust in such conditions. They are also not suitable for fastening drywall to metal profiles, as the thread geometry is specifically optimized for wood.

Key specifications

• Dimensions: 3.5mm diameter by 35mm length
• Material: Carbon steel with phosphate coating
• Head type: Trumpet head
• Point type: Sharp point for wood
• Quantity: 1000 pieces per pack

How to use

To use these screws, align the drywall panel with the wooden frame and use a power screwdriver equipped with a depth-sensitive bit. Position the screw perpendicular to the surface and drive it in until the head is slightly recessed below the surface of the board without breaking the paper facing. Ensure that the screw is driven deep enough to allow for proper finishing but not so deep that it compromises the structural hold of the board.

What to consider before purchase

• Verify that the 35mm length is appropriate for the thickness of your drywall panels
• Ensure the framing material is wood, not metal
• Confirm the total number of screws required for your project area
• Check that your screwdriver bit matches the drive type of the screw

Usage recommendations

For optimal results, use a drywall screwdriver with an adjustable depth stop to prevent over-driving the screws. Ensure that the wooden frame is dry and free from debris before beginning the installation to maintain a secure grip.