Screw SPAX BLAX 30 mm, steel wood screw, 200 pcs, 4 mm thread, T-STAR drive

The SPAX BLAX 30 mm screw is a full-thread, flat countersunk wood screw in black steel designed for fastening wood and wood-based constructions. It features the T-STAR plus hexalobular internal drive for high contact surface and precise bit engagement, a 4CUT arrow-shaped tip to reduce splitting and often eliminate pre-drilling, and a flat countersunk head that sits flush with the surface. The 30 mm length and full thread provide strong tensile and compressive load transfer for demanding wood connections, and the black finish suits dark woods or fittings.

Advantages

The T-STAR plus drive increases contact area between bit and screw head, enabling maximum and precise torque transfer from screwdriver to screw and reducing bit cam-out. The 4CUT tip displaces wood fibres to create room for the screw core, lowering insertion torque and minimising edge splitting so pre-drilling is frequently unnecessary. The flat countersunk head with a polygonal underside mills into the wood for secure, flush seating without additional countersinking steps.

Suitable for

• Fastening window and door frames with plastic or aluminium profiles (plug-free fastening)
• Heavy-duty wood connections in structural or furniture applications
• Interior fittings and decorative furniture where a dark screw appearance is required

When it may not be suitable

This screw may not be suitable where corrosion resistance beyond steel is required (e.g., external, untreated outdoor use) unless an appropriate coating or stainless alternative is specified. In very hard or exotic timbers, or where specific building codes demand pre-drilling, a pilot hole might still be necessary despite the 4CUT point.

Key specifications

• Length: 30 mm
• Material: Steel
• Drive type: T-STAR plus (hexalobular internal)
• Head type: Flat countersunk with polygonal underside
• Thread: Full thread (length spans most or all of the screw)
• Tip: 4CUT arrow-shaped point
• Colour/finish: Black
• Suitable material: Wood
• Quantity per pack: 200 pieces

How to use

Select a T-STAR plus bit that matches the screw head and use a cordless or corded screwdriver set to an appropriate torque for the wood species and screw length. Position the screw and drive it straight into the material; the 4CUT tip will create space for the core diameter and reduce splitting, and the polygonal underside of the flat countersunk head will mill into the surface to allow flush seating. For edge areas or very hard woods, consider a low-power trial insertion or a small pilot hole to confirm performance.

What to consider before purchase

• Whether a black finish is desirable for the visible surface or fittings
• Suitability of steel screws for the intended environment (corrosion requirements)
• Need for pre-drilling depending on wood type and edge proximity
• Required length (30 mm) and whether full-thread is appropriate for the connection

Usage recommendations

Use a matching T-STAR plus bit and set the driver torque to suit the wood species; for serial fastening, use a charged battery to maximise productivity. When working near edges, proceed with care and, if unsure, test on scrap material to confirm no splitting occurs.