Screw SPAX BLAX 20 mm Steel 200 pcs

SPAX BLAX 20 mm screws are steel fasteners for wood applications, supplied in a pack of 200 pieces. Each screw is 20 mm long with a thread length of approximately 13 mm and a head diameter of 7 mm. The screws feature a flat countersunk head, full thread along most of the shank and a 4CUT arrow-shaped tip that reduces wood splitting and lowers the torque required for insertion. The T-STAR plus hexalobular internal drive provides a larger contact area between bit and screw, ensuring optimal bit positioning and efficient transmission of torque from driver to screw.

Advantages

The T-STAR plus drive reduces cam-out and allows faster, more precise fastening with fewer bit slips. The flat countersunk head has a polygonal underside that mills into the wood so the head can sit flush without pre-drilling in many applications. Full thread increases the tensile and compressive forces the screw can transfer in wood, making it suitable for heavy-duty connections. The 4CUT tip displaces wood fibres during insertion, minimising splitting and reducing the required cordless screwdriver torque.

Suitable for

• Installing window and door frames with plastic or aluminium profiles
• Structural wood connections and heavy-duty timber joins
• Interior furniture assembly with dark or black fittings
• General woodworking where minimal pre-drilling is desired

Key specifications

• Brand: SPAX
• Model: BLAX
• Length: 20 mm
• Thread length: approx. 13 mm
• Head diameter: 7 mm
• Material: Steel
• Finish/color: Black
• Head type: Flat countersunk with polygonal underside
• Drive: T-STAR plus (hexalobular internal)
• Tip: 4CUT arrow-shaped
• Quantity: 200 pcs
• Made in: Germany
• Suitable materials: Wood

How to use

Select a T-STAR plus bit matched to the screw drive and mount it in a cordless or corded screwdriver. Position the screw perpendicular to the workpiece and start driving at low speed to ensure the bit seats correctly. Apply steady pressure and increase speed as the screw cuts into the material. For clean countersinking without pre-drilling, allow the polygonal underside of the flat countersunk head to mill into the wood; where material conditions or edge proximity increase splitting risk, consider pre-drilling or reducing insertion speed.

Usage recommendations

Use appropriate personal protective equipment. For applications near edges or in hard/dense woods, perform a trial screw to check whether pre-drilling is required. Store screws in a dry place to avoid corrosion.