The Würth #8 x 2-1/2" flat head assembly screw is sized for cabinet carcass assembly, hardwood and softwood joinery, and panel construction where the fastener needs to reach through one layer and seat firmly into the next. The flat head with nibs, Type 17 Auger point, and coarse thread work together to deliver a clean, flush installation without a separate countersinking step.
At 2-1/2 inches, this screw is long enough to pass through 3/4-inch panel stock and still achieve an inch and three-quarters of thread engagement in the receiving member. That makes it a natural fit for attaching cabinet backs to assembled carcasses, fastening nailers and blocking inside cabinet boxes, connecting face-frame components to solid-wood substrates, and securing shelf standards or hardware backing strips where a shorter screw would fall short of useful bite. The length also suits stacked-panel applications — two 3/4-inch plies joined face-to-face — where the screw needs to clear the near layer before threading into the far one.
The flat head is the right profile whenever the fastener needs to sit flush or just below the material surface. The milling nibs on the underside of the head act as small cutters: as the screw is driven home, they relieve the wood fibers around the head seat and allow the head to bed evenly without tearing or mushrooming the surface. In hardwood species like oak or maple, where a plain flat head would require a countersink bit first, the nibs reduce that step. The Type 17 Auger point extends the standard T17 flute geometry into a longer, more aggressive chip-clearing profile suited to the deeper passes this length demands. Black-finish carbon steel keeps the screw looking intentional rather than incidental in stained or painted interior cabinet work. This screw is for dry interior applications.
Cabinet shops running carcass assembly lines, millwork teams building site-installed casework, and installers connecting cabinet runs to wood blocking will find the 2-1/2 inch length covers the connections that a 2-inch screw can reach but not fully anchor. The coarse thread pulls fast in solid wood and structural-grade plywood, and the #2 Phillips drive means no bit swap on a mixed-hardware job site. The box of 1,000 supports sustained production without constant restocking.
Yes. The screw clears the near 3/4-inch layer and seats the remaining thread engagement into the second panel, pulling the joint tight. Pre-drilling is not required in most plywood assemblies, though a pilot reduces splitting near edges.
The nibs are small milling ridges on the underside of the flat head. As the screw is driven, they cut a shallow seat in the wood surface so the head beds flush without needing a separate countersink operation. They are especially useful in harder species like maple or oak.
This is a coarse-thread screw with a flat head, sized for thicker stock connections. For face-frame rail-to-stile pocket joinery in 3/4-inch hardwood, a fine-thread face-frame screw at 1-1/4 inches is the standard choice. This 2-1/2 inch screw is better suited to attaching the assembled face frame to a cabinet box or fastening through stacked panels into solid backing.
In most softwoods, plywood, and medium-density panels, the auger point starts cleanly without a pilot. In dense hardwoods or when driving close to an edge, a pilot hole prevents splitting and makes driving easier.
The black finish on this screw is designed for dry interior work. For pressure-treated lumber or outdoor exposure, choose a screw with a corrosion-resistant coating rated for those conditions.
When the joint calls for more thread engagement than a shorter screw can deliver, the Würth #8 x 2-1/2" flat head assembly screw provides the length, the point geometry, and the head profile to seat cleanly and hold securely in interior cabinet and casework construction.
Sold In: 1000 Each
