The Würth #8 x 2-1/2" flat head assembly screw is sized for wood-to-wood joints that demand more thread engagement than shorter fasteners provide. Its combination of a Type 17 auger point, coarse thread, flat head with nibs, and #2 square drive makes it a practical production screw for cabinet assembly, furniture joinery, and general woodworking in softwoods and engineered panels.
At 2-1/2 inches, this screw reaches well past what 1-1/2" or 2" fasteners can accomplish. It suits applications where full thread engagement into a second member is the goal: attaching face frames or ledger strips to a deeper cabinet box, fastening through two stacked layers of 3/4" sheet goods, securing shelf standards or blocking inside a case, or pulling together a thicker frame-and-panel assembly. Cabinet shops assembling 3/4" plywood carcasses with secondary interior components often reach for a screw in this length range precisely because it anchors into the substrate rather than stopping short. The 2-1/2" dimension also makes this screw useful when fastening through softwood framing members or built-up lumber where 2" leaves insufficient embedment.
The screw is zinc-plated carbon steel, appropriate for interior cabinet, furniture, and woodworking applications in dry conditions. The zinc coating provides standard galvanic corrosion protection for the indoor environment these screws are intended for. For any project involving pressure-treated lumber or exterior exposure, a different finish and coating system is required.
The #2 square drive recess is designed so a correctly sized bit seats fully in the recess and stays engaged under torque. That fit helps reduce cam-out during repetitive driving, which matters in production assembly where the same motion happens dozens or hundreds of times in a shift. The flat head with nibs is especially useful in cabinetry and furniture work: the nibs cut a clean countersink in softwood, plywood, and similar materials so the head seats flush at the surface without pulling the surrounding wood apart or requiring a pre-drilled countersink in most cases.
Cabinet manufacturers, custom shops, and furniture builders who need a reliable all-around assembly screw in a length that covers thicker stock will find this SKU straightforward to run in volume. The 2,500-piece pack supports production settings where stopping to resupply is a cost. Installers fitting out cabinet interiors, adding nailers and blocking, or anchoring built-ins to wall framing also reach for a 2-1/2" screw when they need penetration past a finished panel and into structure behind it. This is an indoor screw for wood-based substrates. Coarse thread and a Type 17 auger point favor softwoods, plywood, MDF, and particleboard over dense hardwoods, where a fine thread would typically outperform on pull-out strength.
The Type 17 auger point significantly reduces splitting and driving torque in softwood and sheet goods, and many installers drive it without a pilot in those materials. In dense hardwoods or very close to an edge, a pilot hole is still good practice to prevent splitting.
Yes. The coarse thread is well suited to MDF and particleboard, where its wider thread pitch engages more fiber volume per revolution than a fine thread would. Drive carefully near panel edges to avoid blow-out.
The nibs on the underside of the flat head mill a shallow countersink in the wood as the screw is driven, helping the head sit flush at the surface. This is most effective in softwoods and engineered panels; harder materials may benefit from a pre-drilled countersink.
No. Zinc plating provides corrosion protection for dry interior environments. Exterior applications, pressure-treated lumber, and high-humidity conditions require a screw with a heavier corrosion-resistant coating rated for those conditions.
A #2 square drive bit. Using a correctly sized bit is important for the square recess to stay engaged on the fastener during driving.
When 2 inches leaves the job unfinished, the Würth #8 x 2-1/2" flat head assembly screw adds the length that deeper joints, thicker panels, and built-up assemblies require, backed by a Type 17 auger point, coarse thread, and square drive that hold up across a full production box of 2,500.
Sold In: 2500 Each
