Screw SPAX Flat countersunk head T-STAR plus, zinc, 40 mm length, 4 mm diameter, 3.5 cm thread, pack 200

SPAX flat countersunk head screw with T-STAR plus drive, zinc finish, 40 mm length and 4 mm diameter, supplied in a pack of 200. The screw features a 35 mm threaded shank designed for wood connections where a flush countersunk finish is required. Intended for universal indoor woodworking tasks such as carpentry, furniture assembly and interior fittings, this fastener combines a reinforced thread geometry and a T-STAR plus recess for reliable bit engagement and reduced cam‑out.

Advantages

The T-STAR plus drive ensures secure bit grip and optimal force transmission, reducing the risk of stripping and improving driving efficiency. The 4CUT tip and ground serrations enable faster insertion and reduce the need for pre-drilling in many wood types while decreasing the likelihood of splitting, even close to edges. The MULTI head mills into wood for a flush finish and stops cleanly on metal, providing a consistent countersink. Zinc plating offers corrosion protection suitable for typical indoor environments.

Suitable for

• Joining wooden components in furniture assembly
• Carpentry and joinery applications indoors
• Interior fittings such as panelling and trim
• General-purpose wood fastening where a flush finish is required

Key specifications

• Length: 40 mm
• Diameter (thread): 4 mm
• Thread length: 35 mm
• Head type: flat countersunk (MULTI head)
• Drive type: T-STAR plus (Torx-style)
• Material / finish: zinc plated (blue zinc)
• Tip / thread geometry: 4CUT tip with ground serrations
• Pack quantity: 200 pieces

How to use

Select a compatible T-STAR plus bit for your driver and set an appropriate torque to avoid overdriving. Position the screw perpendicular to the wood surface and start driving at low speed until the 4CUT tip engages. In many soft and medium-density woods pre-drilling is not required; for hardwoods or when working very close to edges a pilot hole is recommended to further reduce splitting. Drive the screw until the MULTI head mills in and the head sits flush with the surface.

Usage recommendations

For best results use a cordless or corded driver with adjustable torque; test on a scrap piece to set torque and confirm whether a pilot hole is needed. Store screws in a dry environment to preserve the zinc finish and select corrosion-resistant fasteners for exterior or high-humidity applications.