Wood screw / board screw full thread Velox 4x20mm SIT socket. Quantity per package 1000 pieces. 9420VLOXS

Universal solution for quick assembly of wooden elements

The 4 × 20 mm screw with SIT socket is a practical choice for joining chipboard, plywood, OSB, as well as for assembling wooden doors and windows. Thanks to its partial thread and special countersunk recess, the screw enters the material without unnecessary spinning, accelerating work and reducing battery consumption in screwdrivers. The product has ETA approval, confirming its suitability for timber construction.

Key advantages in daily work

• SIT socket ensures stable screw guidance and even force transmission – the tip does not “skip”, ensuring smooth assembly.
• Partial thread + countersunk recess reduce wood splitting and lower the torque required for driving, extending battery life and improving installer comfort.
• Sliding coating further reduces resistance during screw insertion, while blue zinc-plated steel provides corrosion protection even in humid conditions.
• One tip fits four diameters – the installer does not need to change bits when working with different screw sizes.
• External milling ribs under the head (in Ø3.5 and Ø6 versions) or internal milling pockets (Ø4‑5) ensure clean joints and minimal surface debris, which is especially important for metal components.

Practical applications

Ideal for:

• assembly of furniture fittings,
• assembling chairs and other wooden furniture,
• joining chipboard panels in door and window production,
• fast and precise fastening of structural elements in timber construction.

The package contains 1000 pieces, allowing long-term use both in a professional installer's workshop and for DIY home projects.