Fixing and buying guide
ST501009-ST Ulti-mate II Professional Woodscrew PoziSquare Double Csk Z & Y 5mm X 100mm - (10g) - 300 Tub
What this screw is for
The Ulti-Mate II is a multi-purpose woodscrew suitable for fixing hardwood, softwood, man-made timber boards including MDF, plywood, chipboard and OSB, and sheet metal. The sharp point and aggressive thread design minimises pre-drilling time and reduces driving effort, allowing you to fit more fasteners per battery charge than standard alternatives. The PoziSquare drive accepts both Pozidriv and square drive bits, offering flexibility on site.
- Hardwood and softwood timber
- Manufactured boards: MDF, plywood, chipboard, OSB
- Sheet metal applications
- Situations requiring a flush, countersunk finish
Size and pack contents
Each screw measures 5mm diameter by 100mm length, making it suitable for joining materials of moderate thickness or where good penetration depth is needed. The 300-screw tub provides sufficient quantity for most building and carpentry projects, from structural timber work to board assembly and cladding installation.
- Diameter: 5mm
- Length: 100mm
- Pack quantity: 300 screws per tub
- Head type: Double countersunk (Csk) for flush finish
Compatibility and pre-installation checks
The PoziSquare drive head accepts both Pozidriv and square drive bits, so check your cordless driver or hand screwdriver has the correct bit size and type before starting. Ensure the bit sits fully in the drive recess to avoid cam-out and damage. For sheet metal work, verify material thickness is appropriate for the screw gauge. Pre-drilling is not always necessary due to the sharp point, but consider pre-drilling hardwoods or dense boards to reduce splitting and driving effort.
- PoziSquare drive: compatible with Pozidriv and square drive bits
- Confirm bit engagement before driving
- Pre-drill hardwood and dense boards to prevent splitting
- Check sheet metal thickness is suitable for 5mm gauge
Storage and handling
Store screws in the original tub in a dry location to prevent corrosion. The Z and Y coating provides corrosion resistance suitable for most internal and external applications, but keep away from damp conditions during storage. Check screws are not bent or damaged before use, and discard any that are defective.
- Keep in original tub when not in use
- Store in dry conditions
- Inspect for damage before installation
- Z and Y coating provides corrosion protection