Wood screw Koelner/Rawlplug CS-8080 8x80 mm, washer head, for timber connections

Koelner/Rawlplug CS-8080 8x80 mm is a wood screw with a washer (bearing) head designed for secure timber connections. The screw is intended for joining beams, planks and other wooden elements where the washer head increases the bearing surface, reduces local deformation and prevents pull-through. It is suitable for general carpentry and structural applications that require a reliable mechanical connection between wooden components.

Advantages

The washer head provides improved load distribution on the wood surface and reduces the risk of material crushing around the fastener. Thread geometry and shaft length are matched to typical timber thicknesses to ensure good grip and consistent load transfer. The screw is suitable for use in visible and concealed joints and allows for quicker installation compared with bolts when no pre-assembled washer-nut pair is required.

Suitable for

• Joining beams and rafters in roof and frame structures
• Fixing planks and decking elements
• Installing wooden substructures and supports
• General carpentry and furniture frame assembly

Key specifications

• Diameter: 8 mm
• Length: 80 mm
• Head type: washer (bearing) head to increase bearing surface
• Material/finish: corrosion-resistant coating suitable for timber applications (check product packaging for exact finish)
• Thread: full/partial thread designed for timber gripping and shear resistance

How to use

Select an appropriate pilot hole size when working with hardwoods or when splitting is a concern; softwoods often allow direct driving. Position the screw through the members to be joined and drive with a compatible bit until the washer head contacts the timber surface and provides the required clamping. Ensure alignment of the connected parts and avoid over-torquing which can crush the timber under the washer head. For best results, follow general timber fastening practices and local building regulations.

Usage recommendations

Use corrosion-resistant screws or additional protection if installing in exterior or high-humidity environments. When joining thin or brittle sections, pre-drill pilot holes to prevent splitting. For structural connections, verify requirements for fastener spacing and edge distances according to project specifications or applicable codes.