Screw SPAX BLAX 50 mm, steel wood screw, 200 pcs, 8 mm head, 4.5 cm thread

SPAX BLAX 50 mm screws are full-thread, flat countersunk wood screws made of steel with a black finish. They feature the T-STAR plus hexalobular internal drive for optimal bit engagement and efficient torque transfer, and a 4CUT arrow-shaped tip that displaces wood fibers to reduce splitting and often removes the need for pre-drilling. These 50 mm screws are supplied in packs of 200 and are intended for fastening wood where a flush, low-profile head and high pull-through resistance are required.

Advantages

The T-STAR plus drive increases contact surface between bit and screw head, preventing cam-out and enabling faster, more reliable fastening with cordless drivers. The flat countersunk head has a polygonal underside that mills into the wood so it can be countersunk flush without pre-drilling in many cases. Full threading along the screw length provides higher tensile and compressive force transfer for strong wood connections, while the 4CUT tip reduces required driving torque and minimises splitting, especially near edges.

Suitable for

• Fixing window and door frames with plastic or aluminium profiles without visible obstructive heads
• Heavy-duty wood connections in structural and carpentry work
• Interior furniture assembly and decorative fittings with dark or antique woods

When it may not be suitable

The black finish and flat countersunk head are primarily intended for visible dark woods or black fittings; they may be less suitable where a different colour or head style is required. In very hard or engineered woods, pre-drilling may still be necessary despite the 4CUT tip, and the full-thread design may not be ideal where a partial thread is preferred for clamping two pieces tightly.

Key specifications

• Type: Full-thread wood screw
• Length: 50 mm
• Thread length: approximately 45 mm
• Head style: Flat countersunk with polygonal underside
• Drive: T-STAR plus (hexalobular internal)
• Tip: 4CUT arrow-shaped point
• Material: Steel
• Finish: Black
• Pack quantity: 200 pieces
• Suitable materials: Wood

How to use

Select a T-STAR plus driver bit matching the screw head and fit it securely in a cordless or corded screwdriver. Position the screw at the intended fixing point and start driving at low speed to ensure the bit seats properly. Increase speed and apply steady pressure until the flat countersunk head mills into the material and sits flush. For very hard or brittle timbers, consider pre-drilling to the recommended diameter and depth. Use appropriate protective equipment and follow normal woodworking safety practices.

What to consider before purchase

• Confirm the 50 mm length and full-thread design suit your application
• Check that the black finish and flat countersunk head match the visible surface and fittings
• Verify that your screwdriver accepts T-STAR plus bits
• Assess the timber type to determine whether pre-drilling is necessary

Usage recommendations

For fast, reliable results use a matched T-STAR plus bit and a cordless driver with sufficient battery charge; when working close to edges, the 4CUT tip typically allows you to avoid pre-drilling and reduces splitting risk.