Self-drilling screw Koelner/Rawlplug 4.8x35 mm in RAL6020 is a coated metal fastener supplied as a pack of 150 pieces. The screw combines a self-drilling point with a thread profile intended for fastening thin metal sheets, profiles and similar construction elements without prior hole preparation. The RAL6020 green coating provides surface protection and color matching for cladding, roofing and metalwork where corrosion resistance and visual integration are required.
Advantages
The integrated drill point eliminates the need for pre-drilling, reducing installation time on thin steel and similar substrates. A standardized 4.8 x 35 mm size offers a balance of pull-out strength and ease of driving, suitable for many sheet metal connections. The colored protective finish reduces visible contrast on painted surfaces and improves corrosion resistance compared with plain zinc-plated screws.
Suitable for
- Fastening thin-gauge metal sheets to metal profiles and frames
- Roofing and cladding installations where matching RAL6020 color is desirable
- Metal fabrication and light structural connections on steel panels
- Retrofit and repair jobs where drilling access is limited
When it may not be suitable
This self-drilling screw is intended for thin metal and light structural use; it is not designed for load-bearing connections in heavy structural steel or concrete anchoring. For very thick steel sections, hard or layered substrates, or where specific structural approvals are required, a different fastener type or pre-drilled and specified anchoring system should be used.
Key specifications
- Diameter and length: 4.8 x 35 mm, suitable for typical sheet-to-profile joints
- Self-drilling tip: integrated drill point for screw-in installation without pre-drilling on thin steel
- Coating and color: protective finish in RAL6020 green for visual matching and corrosion resistance
- Pack quantity: 150 pieces per pack for bulk usage and consistent supply on-site
- Head and drive type: designed for efficient driving with compatible screwdrivers or bit holders (check drive compatibility before use)
How to use
Position the screw through the sheet and into the supporting profile at the intended fastening point. Use a compatible driver bit and a drill or powered driver set to a controlled speed and torque to avoid over‑driving or stripping the head. Allow the self-drilling tip to form the hole as the screw advances; maintain perpendicular alignment to ensure correct seating and thread engagement. For through-fixing to thicker supports, monitor penetration and consider pre-drilling if the substrate exceeds the screw’s drilling capacity.
What to consider before purchase
- Confirm material thickness and substrate type to ensure the self-drilling tip can penetrate without pre-drilling
- Verify drive type compatibility (bit shape and size) with your installation tools
- Assess environmental exposure to choose suitable corrosion protection and finish
- Calculate required quantity and consider spare pieces for waste or mistakes
Usage recommendations
Use a controlled-speed driver and the correct bit to achieve consistent fastening. For exterior cladding and roofing, space fasteners according to system manufacturer guidelines and avoid overtightening to preserve the protective coating and substrate sealing.
