Screw SPAX BLAX 25 mm Steel 200 pcs

SPAX BLAX screws are steel fasteners designed for woodworking. Each screw is 25 mm long with a 20 mm thread and a 7 mm head diameter. Manufactured in Germany, these full-thread, flat countersunk screws feature a T-STAR plus (hexalobular internal) drive and a 4CUT arrow-shaped tip to reduce splitting and enable efficient, high-force transmission from driver to screw. The black finish suits dark woods and fittings and the pack contains 200 pieces for larger projects.

Advantages

The T-STAR plus drive increases contact area and ensures optimal bit positioning, enabling maximum, precise force transmission and reducing bit slip. The flat countersunk head with polygonal underside mills into the wood and sits flush without leaving obstructive heads inside window and door frames. Full thread along most of the screw length improves tensile and compressive load transfer for strong wood connections. The 4CUT tip displaces wood fibres to reduce core expansion and splitting, lowering required cordless-driver torque and often eliminating the need for pre-drilling.

Suitable for

• Fastening window and door frames with plastic or aluminium profiles
• Heavy-duty wood connections in structural and decorative joinery
• Interior furniture assembly with dark or antique woods and black fittings
• Series fastening tasks where fast, slip-free driving is required

Key specifications

• Length: 25 mm
• Thread length: 20 mm
• Head diameter: 7 mm
• Drive type: T-STAR plus (hexalobular internal)
• Tip: 4CUT arrow-shaped tip
• Head type: Flat countersunk with polygonal underside
• Material: Steel
• Finish: Black
• Quantity: 200 pcs
• Suitable material: Wood
• Manufacturer country: Germany

How to use

Select an appropriate T-STAR plus bit and fit it to a compatible cordless or corded driver. Position the screw and apply steady pressure while driving, allowing the 4CUT tip to displace wood fibres and the polygonal underside of the countersunk head to mill into the surface. For dense hardwoods or edge-close applications, check whether pre-drilling is advised for your specific material; in many cases with SPAX BLAX the 4CUT tip permits direct driving without a pilot hole.

Usage recommendations

Use the correct-size T-STAR plus bit to avoid wear on the screw head, and test on a scrap piece when working with unfamiliar wood species. For maximum joint strength, ensure full thread engagement across the connection and avoid overtightening that could compress the timber excessively.