Construction screws Koelner/Rawlplug 5.0x120 mm partial thread countersunk head, pack of 4

Pack of four Koelner/Rawlplug construction screws 5.0 x 120 mm with partial thread and countersunk head for applications where a flush finish is required. These screws combine a threaded section for secure clamping with an unthreaded shank that allows the connected timber elements to be pulled together and rotate slightly for precise alignment. The countersunk head sits flush with the surface after installation, producing a neat, unobtrusive joint suitable for visible timberwork and substructures.

Advantages

The partial thread design provides strong clamping force while the unthreaded shank reduces splitting and permits accurate positioning of beams and timber elements. The countersunk head creates a flush surface that can be concealed or finished easily. Manufactured by Koelner/Rawlplug to standard construction screw dimensions, the screws are sized for common structural timber connections and offer reliable mechanical performance in typical wood-to-wood assemblies.

Suitable for

• Fastening timber beams and joists in light structural work
• Attaching substructures for decking, cladding or panels
• Wood-to-wood joining where a flush head is needed
• Repairs and small carpentry projects requiring secure clamping

When it may not be suitable

These screws are intended for timber and light construction use; they are not specified for direct use in masonry, concrete, or heavy steel connections. If long-term exposure to outdoor conditions or aggressive environments is expected, consider corrosion-resistant fasteners or screws with a specified protective coating suitable for the climate and wood treatment used.

Key specifications

• Nominal diameter: 5.0 mm
• Length: 120 mm
• Thread type: partial (incomplete) thread
• Head style: countersunk (flat, flush)
• Pack quantity: 4 screws

How to use

Pre-drill a pilot hole appropriate for the timber species and the screw diameter to reduce splitting and to ensure correct alignment. Insert the screw so the unthreaded shank spans the joint where slip or rotation is required and drive the countersunk head until it sits flush with the surface. Use a compatible driver bit and controlled torque to avoid over-tightening; in thicker or hardwood materials a clearance hole in the upper piece and a pilot hole in the lower piece will improve clamping and alignment.

What to consider before purchase

• Confirm the 5.0 × 120 mm size fits the thickness and joint design of your timber elements
• Check whether a corrosion-resistant finish is needed for outdoor or treated wood use
• Ensure the pack quantity (4 pieces) matches the number required for your project
• Verify compatible driver bit and recommended torque for reliable installation

Usage recommendations

For best results use pilot holes sized to the timber type, avoid excessive torque to prevent head or thread damage, and select additional corrosion protection if the screws will be exposed to moisture or outdoor conditions.