Koelner/Rawlplug construction screws with partial thread and a conical (countersunk) head, size 5.0 x 35 mm, supplied in a pack of 18 are intended for secure joining of wooden and light structural elements where a flush finish is required. These screws are designed for use with drivers and impact tools and provide a controlled pull-together effect thanks to their partial thread, while the conical head sits flush with the material surface to reduce protrusion.
Advantages
Partial threading concentrates the clamping force on the joined parts, improving pull-together and reducing movement between workpieces. The conical head allows countersinking so the screw sits flush with the surface, producing a neat finish and allowing for easy covering with filler or caps. The screws are supplied in a convenient pack of 18, suitable for small to medium projects, and are compatible with common driver bits and impact drivers for quick installation.
Suitable for
- Structural wooden joints where a flush finish is needed
- Carpentry tasks such as frames, joists and battens
- General assembly of light structural elements and fittings
- Installation work using manual or powered drivers and impact tools
When it may not be suitable
These screws are intended for wood and light structural materials; they are not designed for fastening into masonry, concrete, or heavy steel without appropriate anchors or specialist fasteners. For applications requiring full-thread screws for continuous threading along the shank, or for extremely heavy load-bearing metal connections, a different fastener type should be selected.
Key specifications
- Thread type: partial thread for clamping action
- Head type: conical (countersunk) head for flush finish
- Diameter: 5.0 mm
- Length: 35 mm
- Pack quantity: 18 pieces
- Drive compatibility: common driver bits and impact drivers
How to use
Select a suitable driver bit that matches the screw drive and set the driver to the appropriate torque for the material to avoid overdriving or stripping. Pre-drilling a pilot hole is recommended for hardwoods or near edges to reduce splitting; the pilot hole diameter should be matched to the screw core. Drive the screw until the conical head is flush with the workpiece surface. When a fully concealed finish is required, countersink the hole slightly deeper and cover with filler or a plug.
What to consider before purchase
- Ensure the 5.0 x 35 mm size is suitable for the material thickness and joint design
- Confirm compatibility with your driver or impact tool and the correct driver bit
- Decide whether partial thread is appropriate for the intended clamping and joint strength
- Check corrosion resistance requirements for the environment where the screws will be used
Usage recommendations
For best results use a pilot hole in dense woods, set the driver torque to avoid head damage, and store the remaining screws in a dry place. When a recessed finish is required, countersink before driving and use wood filler or a decorative cap to conceal the head.
