Koelner/Rawlplug construction screws partially threaded countersunk head 4.0x60 mm, pack 16 are metal fasteners designed for flush, load-bearing connections in wood and wood-to-metal assemblies. With a partially threaded shank and a conical countersunk head, these screws allow the head to sit flush with or below the surface for a neat finish. Supplied as a pack of 16, they are intended for structural fastening, furniture assembly and general carpentry where a combination of tensile pull-through resistance and precise seating is required.
Advantages
Partially threaded design provides a smooth shank portion that pulls connected pieces tightly together while the threaded tip secures material grip. The countersunk (conical) head enables recessed installation so the head does not protrude above the work surface, improving aesthetics and preventing catching. The screw geometry is optimized for use in wood and chipboard and for metal-to-wood connections, delivering consistent drive and holding performance. Pack of 16 offers a convenient quantity for small to medium projects.
Suitable for
- Structural timber connections where a flush head is required
- Furniture assembly and cabinetry with concealed fastenings
- Joining wood to metal components where partial thread is preferred
- General carpentry tasks such as framing, fittings and trims
When it may not be suitable
These screws are intended primarily for wood and wood-to-metal applications; they are not specified for use in masonry, concrete, or pure metal-to-metal structural joints. For applications requiring a fully threaded fastener, additional corrosion-resistant coatings, or specialized head profiles (e.g., raised head, pan head), select a screw designed for that purpose. Performance may vary with extremely hard or engineered timbers unless appropriate pilot holes are used.
Key specifications
- Thread type: partially threaded shank with threaded tip
- Head type: conical countersunk head for flush mounting
- Diameter: 4.0 mm
- Length: 60 mm
- Quantity: 16 pieces per pack
- Intended materials: wood, chipboard and metal-to-wood connections
How to use
For reliable results, select an appropriate pilot hole diameter according to the timber species and density; softer woods require a smaller pilot hole than hardwoods. Place the screws so the unthreaded shank can pull the joined pieces together, then drive the screw until the conical head is flush with the surface or slightly countersunk. Use a compatible driver bit and controlled torque to avoid over-tightening which can strip threads or split the wood. In metal-to-wood applications, ensure the metal component is correctly aligned and pre-drilled if necessary.
What to consider before purchase
- Confirm screw length (60 mm) and diameter (4.0 mm) match your material thickness and load requirements
- Decide if a partially threaded fastener with a countersunk head is suitable for your assembly needs
- Check whether additional corrosion protection is required for outdoor or humid environments
Usage recommendations
Use a pilot drill matched to the screw and timber; apply steady torque and stop when the head is flush. For exterior or high-moisture installations consider additional protective coatings or stainless alternatives. For higher loads, pair screws with appropriate washers, brackets or adhesive where indicated by structural design.
