Screw SPAX BLAX 40 mm Steel 200 pcs

SPAX BLAX 40 mm steel screws are designed for wood applications and come in a pack of 200 pieces. Each screw is 40 mm long with a thread length of 35 mm and a head diameter of 9.6 mm. The screws feature a flat countersunk head and a black finish, combining a discreet appearance with functional head geometry suitable for installing window and door frames or decorative fittings. Manufactured in Germany, these full-thread screws are intended for demanding wood connections where reliable force transmission and reduced splitting risk are required.

Advantages

The T-STAR plus hexalobular drive provides a large contact surface and optimal bit positioning for maximum, precise force transmission from driver to screw, minimising bit slips and enabling faster, more efficient fastening. The flat countersunk head has a polygonal underside that mills into the wood and allows flush countersinking without pre-drilling in many cases. Full-thread design increases tensile and compressive load capacity along the entire screw length, making these screws suitable for heavy-duty wood connections. The 4CUT arrow-shaped tip displaces wood fibres to reduce core expansion and splitting and lowers the required cordless screwdriver torque, often eliminating the need for pre-drilling.

Suitable for

• Fastening window and door frames made of plastic or aluminium profiles into wood
• Heavy-duty wood connections in structural carpentry and joinery
• Decorative furniture construction with dark or antique woods and dark metal fittings
• Interior woodwork where a flush, low-profile countersunk head is required

Key specifications

• Length: 40 mm
• Thread length: 35 mm
• Head diameter: 9.6 mm
• Drive type: T-STAR plus (hexalobular internal)
• Tip: 4CUT arrow-shaped point
• Head: flat countersunk with polygonal underside
• Material: Steel
• Finish: Black
• Quantity: 200 pcs
• Suitable for: Wood
• Origin: Germany

How to use

Select a T-STAR plus bit sized to match the screw drive and fit it into a suitable cordless screwdriver or drill. Position the screw on the workpiece and start driving at low speed to ensure the bit engages the head correctly. Increase speed and torque as required until the flat countersunk head sits flush with the surface. For dense or brittle timber or when working very close to an edge, consider reducing torque or using a pilot hole—though the 4CUT tip and polygonal underside often allow screw-in without pre-drilling.

Usage recommendations

Use a matching T-STAR plus bit to avoid cam‑out and to achieve optimal force transmission. When fastening near edges or in hardwoods, monitor torque and consider a pilot hole if necessary. Store screws in a dry place to maintain the black finish and prevent corrosion.