Wood screw Koelner/Rawlplug TS-3525 3.5x25 mm, countersunk head, TX drive

Koelner/Rawlplug TS-3525 is a 3.5x25 mm wood screw with a countersunk conical head and a TX (Torx) drive. It is designed to pull wooden parts together and seat flush with the surface, making it suitable for timber, softwood, hardwood and common wood-based panels. The TX drive reduces cam‑out and allows higher torque transfer compared with a standard Phillips or Pozidriv bit, while the conical head provides a neat, recessed finish once installed.

Advantages

The countersunk head ensures a flush finish, preventing protruding screw heads and enabling subsequent surface treatments or coverings. The Torx (TX) drive delivers improved bit engagement and reduced slippage, which helps protect screw heads and driver bits during installation. The 3.5 mm shank diameter and 25 mm length provide a balance between pull-in strength and minimal splitting risk in typical woodworking applications.

Suitable for

• Carpentry and joinery tasks
• Furniture assembly and repairs
• Fixing trims, mouldings and fittings
• Securing wood-based panels and cabinets

Key specifications

• Diameter: 3.5 mm
• Length: 25 mm
• Head type: Countersunk (conical)
• Drive type: TX (Torx)
• Intended material: Timber and wood-based panels

How to use

Pre-drill pilot holes when working near edges or in hardwood to reduce the risk of splitting; select a drill bit slightly smaller than the screw core diameter. Use a matching TX driver bit sized for the screw to ensure full engagement and prevent cam‑out. Drive the screw until the head is flush with the surface; stop once the head is fully seated to avoid over‑countersinking or damaging the surrounding material. For repeated assembly tasks, use a torque‑controlled driver to maintain consistent results.

Usage recommendations

Store screws in a dry place to prevent corrosion and sort by size before use to improve workflow. For exterior or high‑moisture applications, verify material corrosion resistance or use appropriate coating or stainless alternatives. When fixing near edges or thin boards, use a smaller pilot hole and consider clamping the pieces to minimize splitting.