Fixing and buying guide
A400401STB Ulti-mate II Professional Woodscrew PoziSquare Double Csk BZP&Y - (8g) 4mm X 40mm - 200
What you get and compatibility
This pack contains 200 screws in 8g x 40mm size with a double countersunk head and PoziSquare recess. The screws are zinc plated and yellow passivated (BZP&Y) for corrosion resistance. They are compatible with hardwoods, softwoods, engineered boards including MDF, plywood, chipboard and OSB, and can also be used for sheet metal fixing. A Stick-Fit driver bit is included in the box.
- Pack quantity: 200 screws
- Gauge: 8g, Length: 40mm
- Head type: Double countersunk (Csk)
- Recess: PoziSquare
- Finish: Zinc plated and yellow passivated (BZP&Y)
- Includes Stick-Fit driver bit with patented PSD recess
Choosing the right size
At 40mm length, these screws are suitable for joining materials of moderate thickness. The 8g gauge provides good holding power without being oversized. Consider the thickness of your workpiece and substrate when selecting this length. For thinner materials or pilot hole requirements, ensure you follow standard practice for the timber type you are working with.
- 40mm length suits general woodworking and board assembly
- 8g gauge offers balanced strength and ease of driving
- Double countersunk head sits flush with the surface
- Suitable for both face fixing and edge joining applications
Installation and the Stick-Fit advantage
The included Stick-Fit driver bit features a patented PSD recess that grips the screw securely once engaged, allowing you to drive with one hand whilst positioning your workpiece with the other. This is particularly valuable when aligning components or working alone. The PoziSquare recess provides excellent bit engagement and reduces the risk of cam-out during driving.
- Stick-Fit connection keeps screw attached to bit during one-handed driving
- PoziSquare recess ensures positive bit engagement
- Ideal for positioning work accurately during installation
- Use the included driver bit for optimal performance
Pre-installation checks
Before fixing, ensure your workpiece is clean and dry. For hardwoods and denser boards, consider pre-drilling to prevent splitting and to ease driving. Check that your power drill or driver is compatible with the Stick-Fit bit provided. Verify that the 40mm length is appropriate for your application, accounting for the thickness of both the face material and the substrate you are fastening into.
- Pre-drill in hardwoods and dense materials to prevent splitting
- Ensure workpiece surfaces are clean and dry
- Confirm screw length is suitable for your material thickness
- Use the included Stick-Fit driver bit for best results