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Power Tools Direct£2.96Visit shop Timco Yellow 40040C2c C2 Clamp-Fix Multi-Purpose Premium Screws - Tx - Double Countersunk - 4.0 X 40 Box 200
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The TIMco C2 Clamp-Fix Multi-Purpose Screws are designed for professional carpenters, joiners, and builders working with timber-to-timber applications. Their key benefit is preventing timber 'jacking' for secure, stable connections, while a potential caveat is their specific TX drive recess requiring a compatible bit. These screws feature patented twin-cut point technology, a high-molecular polymer lubricant coating for reduced insertion torque, a dual angle thread for superior pull-out resistance, and ribs under the head for improved countersinking.
| Colour | Yellow |
|---|---|
| Model Part Number | 40040C2C |
| Brand | TIMco |
The C2 Clamp-Fix screws feature patented twin-cut point technology, a special lubricant coating reducing torque, a dual angle thread for higher pull-out resistance, and under-head ribs for better countersinking. They are specifically engineered to prevent timber 'jacking'.
You will need a TX20 driver bit.
Yes, they have corrosion resistance up to 20 times longer than standard zinc plating (Corrosion Rating 2), making them suitable for occasionally damp/wet, rural, and sheltered areas.
They are suitable for thin sheet metal, but their primary design and performance benefits are optimized for timber and wood-based materials.
Timber jacking is when timber separates or lifts apart during fastening. The dual angle thread and specific design of these screws actively counteract this tendency, ensuring a more stable and secure timber-to-timber connection.
The high-molecular polymer lubricant coating reduces insertion torque by up to 52%, making the screws easier and faster to drive, reducing wear on tools, and minimizing user fatigue.
The 4.0mm is the nominal outer diameter of the main thread, while the 2.35mm is the diameter of the shank before the thread starts, relevant for calculating pilot hole sizes or understanding the core strength.
Ensure you are using the correct TX20 driver bit and that it is fully seated in the recess. Apply firm, consistent pressure during driving.
Verify the timber type is compatible. For very dense hardwoods, pre-drilling a pilot hole may be beneficial, though the twin-cut point is designed to minimize this.
Ensure the ribs under the head are not obstructed. Check that the pilot hole (if used) is not too large. Apply consistent driving pressure.
Confirm you are using the correct driver bit and that it is not worn. The lubricant coating should significantly reduce torque; if resistance is very high, check for obstructions or underlying timber issues.
Setup: Ensure you have a compatible TX20 driver bit for your drill or screwdriver. Clean the timber surfaces where the screws will be inserted. For best results, drive the screw straight and ensure it is fully countersunk for a flush finish.
Compatibility:
Care: While these screws offer enhanced rust protection (Corrosion Rating 2), they are not intended for constant immersion in water or highly corrosive environments. For applications in such conditions, higher-rated corrosion-resistant screws should be considered. Store screws in a dry place to maintain their protective coating.
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