The Würth #8 x 2-1/2" flat head assembly screw is a coarse-thread, square-drive fastener with a Type 17 Auger point and underhead nibs. The 2-1/2" length reaches cleanly through cabinet panels, stretchers, and solid-wood components where shorter screws leave inadequate thread engagement in the second member.
Cabinet carcass assembly often calls for a screw that can pull through a 3/4" panel and still thread deeply into a second member — a rail, nailer, or solid-wood stretcher — without bottoming out. At 2-1/2", this screw delivers that reach. It suits joining back nailers to cabinet sides, fastening face-frame blocking inside a box, securing shelf-pin cleats, and anywhere else the joint thickness pushes past what a 1-1/2" or 2" screw can reliably grip. The Type 17 Auger point helps the screw start cleanly and eject chips through the full depth of the hole, which matters when driving through laminated or multi-layer assemblies.
The screw is carbon steel with a black finish and is intended for interior woodworking and cabinet assembly. The flat head with nibs countersinks in place as it seats, which keeps installation moving without a dedicated countersink bit in most cabinet-grade materials. Coarse thread provides strong pull-out resistance in the fibrous materials common to cabinet work: solid wood, plywood, and pine. The square drive reduces cam-out during high-volume driving, which matters when running a full shop run of cabinet boxes.
Cabinet shops assembling frameless or face-frame carcasses will find the 2-1/2" length covers the joints that need a longer fastener without switching to a structurally different screw. Finish carpenters installing pre-built cabinets and needing to attach blocking or build up backing behind cabinet walls will also work through these regularly. The 1000-piece box suits production environments where stopping to restock mid-run costs time. The black finish is practical in shops building dark interiors or installing backs where a silver screw head would stand out.
After passing through a 3/4" panel, approximately 1-3/4" of threaded shank remains to engage the second member. That is sufficient for a strong grip in solid wood, plywood, and softwood nailers or rails at typical cabinet carcass thicknesses.
In most cabinet-grade wood substrates — solid wood, plywood, softwood — the underhead nibs mill a clean countersink as the head seats. Dense hardwoods may benefit from a pilot hole to assist seating, but a separate countersink step is generally not needed.
No. The black finish on this screw is rated for interior woodworking. For outdoor or pressure-treated lumber applications, choose a screw with a corrosion-resistant coating rated for that exposure.
The square drive on this screw uses a #2 square bit. Using a correctly sized bit is important — an oversized or worn bit reduces the drive's holding ability on the fastener.
Coarse thread pulls out more wood fiber per revolution in solid wood, softwood, and plywood, giving stronger withdrawal resistance in those materials. Fine thread is better suited to metal or dense hardwood where thread density improves grip — coarse is the right call for most cabinet carcass work.
When the joint calls for more reach than a standard cabinet screw delivers, the Würth #8 x 2-1/2" assembly screw is the version to pull from the shelf — square drive, Type 17 Auger point, coarse thread, and nibs, in a length built for the thicker assemblies cabinet work regularly produces.
Sold In: 1000 Each
