SPAX universal screws T20 half-round head WIROX 4 mm x 20 mm, pack of 1,000

Pack of 1,000 SPAX universal screws with T20 drive and half-round head, WIROX surface finish, 4 mm shank diameter and 20 mm length. These screws are designed for general fastening tasks in wood and thin metal where a universal thread profile and a corrosion-resistant WIROX coating are required. The half-round head provides a neat, low-profile appearance above the surface while the T20 drive ensures consistent engagement with compatible drivers. This pack is intended for professional and DIY use in construction, furniture assembly and renovation projects where a large quantity of matching fasteners is needed.

Advantages

Universal thread geometry enables secure holding in a variety of base materials, reducing splitting in timber and improving pull-out resistance. The WIROX surface finish increases corrosion resistance compared with untreated steel, extending service life in interior and sheltered exterior applications. The T20 drive reduces cam-out and allows faster, more controlled installation with power or manual drivers. Supplied in a pack of 1,000, the screws offer consistency in dimensions and finish across a large volume, simplifying logistics on repeat jobs.

Suitable for

• General wood-to-wood and wood-to-metal fastening
• Furniture assembly and cabinetry work
• Interior renovation and trim installation
• Light construction tasks and fixture mounting
• Projects requiring corrosion-resistant coated screws

Key specifications

• Head type: half-round (raised dome) head
• Drive type: T20 (Torx)
• Shank diameter: 4.0 mm
• Length: 20 mm
• Thread type: universal thread suitable for wood and thin metal
• Surface finish: WIROX corrosion-resistant coating
• Quantity: 1,000 pieces per pack

How to use

Select a T20 bit or driver compatible with your power tool or manual screwdriver. For hardwoods or precise alignment, pre-drill a pilot hole sized appropriately for a 4.0 mm shank to reduce splitting; in many softwoods the universal thread allows direct driving without pre-drilling. Position the screw with the half-round head flush or slightly proud of the surface depending on finishing requirements, then drive at moderate speed with steady pressure until seated. When fastening into thin metal, use appropriate pilot holes and support the material to prevent deformation. For repeatable results, use a torque-limited driver or clutch setting to avoid over-tightening.

Usage recommendations

Store the pack in a dry environment to preserve the WIROX finish. Use compatible T20 bits to avoid cam-out and tool wear. For exterior exposed applications, consider using stainless or higher-grade coated fasteners if long-term exposure to weather and salt is expected; WIROX provides improved corrosion resistance for interior and sheltered exterior use but is not a substitute for stainless steel in severe environments.