Concrete screw Koelner/Rawlplug M8 x 90 mm, countersunk head, pack of 10

Concrete screw Koelner/Rawlplug M8 x 90 mm with a countersunk head, pack of 10, is engineered for direct fastening into solid concrete and masonry where a flush surface is required. The screw’s tapered countersunk head sits level with the material surface after installation, making it suitable for visible fixings and applications that require a neat finish. It is intended for mechanical anchoring in solid substrates and for fastening profiles, brackets, rails and similar structural elements in construction and renovation tasks.

Advantages

The product provides immediate mechanical anchoring without the need for chemical adhesives or separate anchors, enabling faster installation. Its countersunk head ensures a recessed finish for a clean appearance and reduced interference with mounted components. Supplied as a pack of 10, it offers multiple fasteners for small to medium projects and reduced handling of individual screws. The design minimizes the risk of pull-out in solid concrete when correctly installed.

Suitable for

• Fixing metal and wooden profiles to solid concrete and masonry
• Mounting brackets, rails and rails systems in construction and renovation
• Securing structural elements where a flush head is required
• Applications requiring mechanical anchoring without use of chemical anchors

When it may not be suitable

This concrete screw is intended for use in solid concrete and masonry only and is not recommended for hollow blocks, lightweight aerated concrete or soft substrates where mechanical engagement is insufficient. It may not be suitable for applications requiring very high load capacities in tension or for use in corrosive environments unless a corrosion-resistant material or coating is confirmed.

Key specifications

• Thread size: M8
• Length: 90 mm (total screw length)
• Head type: countersunk (flat finish when installed)
• Quantity: pack of 10 screws
• Application substrate: solid concrete and masonry

How to use

Drill a hole in the solid concrete or masonry at the correct diameter and depth for the M8 concrete screw, using a hammer drill with an appropriate masonry bit. Clean the drilled hole from dust and debris to ensure proper seating. Insert the screw and drive it into the hole until the countersunk head sits flush with the surface; use a wrench or driver suitable for the screw head profile and observe recommended torque limits to avoid over-tightening. Verify that the mounted element is secure and that the screw head is flush with the substrate.

What to consider before purchase

• Verify substrate type—suitable for solid concrete and masonry, not for hollow or very soft materials
• Confirm required screw length and M8 thread size for your application
• Check whether a corrosion-resistant finish is required for your environment
• Ensure you have the correct drill bit and installation tools for M8 concrete screws

Usage recommendations

For reliable performance, use a hammer drill and clean the hole before installation, follow manufacturer torque recommendations, and avoid reusing screws removed from concrete as holding power may be reduced.