Screw SPAX BLAX 20 mm Steel 200 pcs

SPAX BLAX 20 mm screws are steel full-thread fasteners designed for wood applications. Each screw is 20 mm long with a 6 mm flat countersunk head and a thread length of approximately 17 mm. The screws feature the T-STAR plus hexalobular internal drive for optimal bit engagement, a 4CUT arrow-shaped tip to reduce wood splitting, and a flat countersunk head with a polygonal underside that allows secure, flush seating without pre-milling in many wood types. The pack contains 200 screws manufactured in Germany for general woodworking and furniture applications.

Advantages

The T-STAR plus drive increases contact surface and ensures precise force transmission from driver to screw, minimising bit cam-out and enabling faster serial fastening. The full thread extends along most of the screw length to provide higher tensile and compressive load transfer for stable wood connections. The 4CUT tip displaces wood fibres to reduce core expansion and splitting, lowering the required cordless-driver torque and often eliminating the need for pre-drilling. The flat countersunk head with polygonal underside mills into the wood for flush seating and a low-profile finish.

Suitable for

• General woodworking and joinery
• Installing window and door frames with plastic or aluminium profiles
• Decorative furniture assembly with dark or antique woods and black fittings
• Applications close to board edges where splitting risk is high

Key specifications

• Brand: SPAX
• Model: BLAX
• Length: 20 mm
• Thread length: ~17 mm
• Head diameter: 6 mm (flat countersunk)
• Drive: T-STAR plus (hexalobular internal)
• Tip: 4CUT arrow-shaped
• Material: Steel
• Finish / Colour: Black
• Quantity: 200 pcs
• Country of manufacture: Germany

How to use

Select a T-STAR plus bit that matches the screw drive and fit it to a suitable cordless or corded screwdriver. Position the screw perpendicular to the workpiece, apply steady axial pressure and drive at moderate speed until the flat countersunk head sits flush with the surface. For denser or engineered woods check torque settings and, if necessary, use a lower speed or stop-and-start technique to avoid over-torquing. In most common wood species the 4CUT tip and polygonal underside allow insertion without pre-drilling; verify on a test piece when uncertain.

Usage recommendations

Use these screws for heavy-duty wood connections and serial fastening tasks where reduced splitting and fast, reliable installation are required. Test on scrap material before final installation when working with very hard or brittle wood species.