Spax® Screw, Countersunk Head with TS Slot, Fully Threaded

Is the 4.0 mm thread suitable for standard timber fixing jobs?

Yes. This SPAX screw has a thread diameter of 4.0 mm, which is commonly used for secure fastening in timber applications. It is a good choice when you need a firm hold and reliable grip from a 30 mm length screw.

Do I need to pre drill when using these SPAX countersunk screws?

Often you can drive without pre drilling in many timber scenarios, thanks to the screw design. However, pre drilling can be beneficial for harder timbers, edge fixing, or when you want to reduce the risk of splitting. Use the material of your project and your site practice as the guide.

What head style are these screws and will they sit flush?

They have a countersunk head designed to sit flush with the surface when installed correctly. This makes them a practical option for joinery work and finishes where you want a clean, flat look.

Which drive should I use to install them?

Use a T Star Torx driver matching the screw drive. The correct bit helps you apply steady torque and reduces the chance of cam out, especially when driving multiple screws.

Are these screws suitable for damp or exterior type conditions?

They are zinc plated which helps with corrosion resistance compared with plain steel screws. If your project is fully outdoors or exposed to persistent moisture, it is still wise to check your application requirements and follow relevant building guidance.

What does the 4CUT tip do during fixing?

The screw features a 4CUT tip with a patented wave profile intended to support easier starting and improved cutting performance. This can help you get a smoother drive and consistent engagement as the screw bites into timber.

How many screws are included in the pack?

You get 200 screws per pack. This is useful if you are planning a small to medium job and want enough quantity to complete the fix without interruptions.

Can I use these screws where building regulations approval is referenced?

These screws are listed as building regulations approved under Z 9.1 235. Always verify that the approval details match your specific build and specification requirements before installing.