TIMCO C2 Clamp-Fix Timber Clamping Screws – TX – 4.0mm x 40mm

Timco C2 Clamp-Fix screws are purpose-designed timber-to-timber clamping screws developed to prevent timber “jacking” during installation and deliver tight, stable joints.

Unlike standard woodscrews, Clamp-Fix screws are engineered to draw two pieces of timber together as the screw is driven, helping achieve a clean, flush finish without gaps or material lift. This makes them ideal for applications where joint control and alignment are critical.

A precision TX (Torx) drive recess provides positive engagement and helps prevent cam-out, allowing controlled driving and consistent results. Ribs under the double countersunk head improve countersinking and help reduce splitting and surface damage.

Clamp-Fix screws feature Timco’s patented Twin-Cut point for rapid pick-up, faster insertion and reduced timber splitting. A dual-angle thread delivers strong holding power, while a high-molecular polymer lubricant reduces insertion torque by up to 52% and improves corrosion resistance compared to standard zinc plating.

Clamp-Fix screws are partially threaded from 40mm, allowing the unthreaded shank to pull the top timber tight against the second piece and create a true clamping effect.

They are commonly used for timber framing, decking substructures, fencing, studwork and joinery where preventing timber jacking and achieving a secure, closed joint is essential.