Construction Screws Koelner/Rawlplug 4.0x45 mm Partial Thread Countersunk Head, 22 pcs per Pack

Koelner/Rawlplug construction screws 4.0x45 mm with partial thread and a countersunk head are designed for fastening wood and joinery applications where a flush finish is required. Supplied in a pack of 22 pieces, these screws combine a partly threaded shank for clamping with a smooth section that pulls materials together, and a conical head that sits flush in countersunk holes. The screws are suitable for structural and general assembly tasks in interior and sheltered exterior projects.

Advantages

The partial thread provides a firm clamping action while the smooth shank reduces splitting and allows precise material draw. The countersunk (conical) head enables a flush finish, making the fasteners suitable for visible surfaces where a neat appearance is important. Supplied in a compact pack of 22 pieces, these screws are convenient for small to medium projects and repairs.

Suitable for

• Wood-to-wood connections in furniture and joinery
• Structural timber assemblies where a flush head is needed
• Interior fittings, trims and baseboards
• General repair and small construction tasks

When it may not be suitable

These screws are intended for wood and joinery work and are not designed for heavy-duty masonry or concrete anchoring without suitable plugs or anchors. They may not be appropriate for continuous outdoor exposure unless the material finish and corrosion resistance match the environmental conditions.

Key specifications

• Diameter: 4.0 mm
• Length: 45 mm
• Thread type: partial (incomplete) thread
• Head type: countersunk (conical) head
• Quantity: 22 pieces per pack
• Intended material: wood and joinery

How to use

Pre-drill a pilot hole appropriate to the wood species and screw diameter to reduce splitting, especially near edges. Position the screw so the countersunk head sits flush with the surface and drive with a suitable driver or bit at moderate speed to avoid over-torquing. Use the smooth shank section to draw the two workpieces together while the threaded portion secures the grip in the lower piece.

What to consider before purchase

• Check material and finish to ensure adequate corrosion resistance for the intended environment.
• Confirm that 4.0×45 mm is the correct size for the thickness of materials to be fastened.
• Determine whether partial thread is appropriate for your joint type versus fully threaded screws.
• Ensure you have the correct pilot drill size and driver bit for the screw head.

Usage recommendations

For best results, use a pilot hole and the correct driver bit; avoid over-tightening to maintain a flush finish and prevent wood damage. When using outdoors, select screws with suitable corrosion protection or pair with appropriate coatings and treated timber.