Concrete screw Koelner/Rawlplug M6 7.5x40 mm with a countersunk (lens) head, supplied in a pack of 10. This fastener is intended for direct anchoring into concrete and masonry where an M6 threaded connection and 40 mm embedment are required. The countersunk head sits flush with the surface after installation, providing a neat finish for visible fixings in mechanical installations, mounting brackets and general construction applications when combined with appropriately sized predrilled holes.
Advantages
The Koelner/Rawlplug M6 7.5x40 mm concrete screw provides a threaded, removable connection suitable for concrete and masonry substrates. Its countersunk head allows fixtures to sit flush with the surface, reducing protrusion and improving the appearance of installed elements. Supplied in a pack of 10, it enables multiple fixings for small projects or repairs and simplifies inventory for installers.
Suitable for
- Fixing metal brackets and mounting plates to concrete or brick
- Mechanical installations and light structural applications requiring an M6 thread
- Anchoring conduit clips, cable trays and fixtures in utility and construction works
- Repair work and retrofit installations where removable threaded connections are needed
When it may not be suitable
This concrete screw is intended for use in solid concrete and masonry; it is not designed for hollow block substrates without suitable inserts or anchors. If a higher load capacity, larger diameter, greater corrosion resistance or specialized chemical anchoring is required, alternative fasteners or anchoring systems should be considered. Also avoid using the screw where the embedment length or thread size does not match design requirements.
Key specifications
- Thread size: M6
- Shank diameter: 7.5 mm
- Length: 40 mm (total length)
- Head type: Countersunk (lens) head for flush finish
- Quantity: Pack of 10 screws
- Material/finish: suitable for concrete/masonry applications (see manufacturer details)
How to use
Drill a pilot hole in the concrete or masonry using the correct drill bit size for a 7.5 mm shank, ensuring the hole depth matches the screw length plus clearance for dust. Clean the hole of dust and debris before insertion. Place the fixture over the hole, insert the screw through the fixture and into the hole, then tighten using the appropriate screwdriver or socket until the countersunk head sits flush with the surface. Do not overtighten; follow recommended torque values from the manufacturer when available. For hollow or weak substrates use appropriate anchors or alternative fixing systems.
What to consider before purchase
- Ensure the thread size (M6) and 40 mm length match your application requirements
- Confirm the substrate type is solid concrete or suitable masonry for direct screw anchoring
- Check required drill bit size and available installation tools
- Assess environmental conditions and whether additional corrosion protection is necessary
Usage recommendations
For consistent performance, use a rotary hammer or impact drill with the correct concrete bit, clear drilled holes of dust with a brush or compressed air, and tighten screws to the manufacturer's recommended torque. For load-critical or safety-related fixings, follow engineering specifications or consult a structural professional.
