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This Würth #8 x 2-1/2 inch flat head assembly screw delivers the extra thread engagement needed when fastening through thick stock or joining components where a shorter screw would fall short. It carries a coarse thread, Type 17 Auger point, flat head with nibs, and a #2 square drive — a combination matched to cabinet box assembly, casework, and general woodworking production in hardwoods and softwoods alike.
Cabinet and casework assembly often calls for screws that can bridge two layers of material or reach deep into a frame member. At 2-1/2 inches, this screw handles those joints: securing cabinet backs to face frames, fastening rails through side panels, anchoring stretchers or nailers inside a box, and joining stacked or doubled panels where a 1-1/2 or 2 inch screw would leave too little thread in the second piece. It also works well when attaching cabinet boxes to wall blocking or wood backing where penetration depth matters for pull-out resistance.
The coarse thread is the right choice for the substrate types common in cabinet production: softwood, plywood, particleboard, MDF, and melamine-faced board. In these materials, the wider thread pitch grips more fiber volume per turn and drives more efficiently than a fine thread would.
The Type 17 Auger point features an extended flute that removes chips ahead of the thread, which cuts driving resistance and reduces the pressure that causes splitting near edges or in denser grain. In production cabinet work, that means fewer split panel edges and fewer backed-out screws from torque spikes.
The flat head carries underhead nibs that mill a clean countersink as the screw is driven home. In plywood, particleboard, and softwood, the head seats flush in a single operation. The black finish keeps screw heads from standing out against dark cabinet interiors or primed box stock, a practical detail when visible fasteners would affect the finished appearance.
A 2500-piece box is sized for shops that run through assembly screws steadily — production cabinet lines, custom casework operations, millwork teams, and installers doing multi-cabinet runs. The #2 square drive is standard equipment in most cabinet shops, so no bit changeover is needed. The screw's geometry is consistent across the box, which matters when an automated or semi-automated driving setup needs repeatable torque behavior from the first screw to the last.
Homeowners building a single cabinet run or trim carpenters handling occasional casework will find the 2-1/2 inch length useful wherever standard 2 inch screws come up short in thicker assemblies.
When fastening through a panel and into a frame member, or when joining two layers of 3/4 inch material, 2-1/2 inches puts more thread into the receiving piece than a 2 inch screw does. More thread engagement means more pull-out resistance in the joint.
Yes. The coarse thread is well suited to particleboard, MDF, and melamine-faced panels — materials where a coarse pitch grabs more fiber per turn than a fine thread. Drive into the face or edge of the panel, not the end grain, where holding power in engineered sheet goods is limited.
Not in most wood-based substrates. The nibs on the underside of the head mill a countersink as the screw seats, so the head finishes flush in a single operation. In very hard or dense material, a shallow countersink pass may still help the head seat cleanly.
The Type 17 Auger point reduces torque and splitting in denser grain, and the screw will drive in hardwood. For hardwood face-frame joinery specifically, a fine-thread screw is the better technical match because fine threads hold more securely in tight-grained hardwood. This coarse-thread screw is the stronger choice for softwood, plywood, and engineered panel material.
A #2 square drive bit fits this screw. That is the standard square bit size used for #8 assembly screws across most cabinet and woodworking production work.
When cabinet joints need the depth that shorter screws cannot provide, this Würth #8 x 2-1/2 inch flat head assembly screw delivers the thread engagement, clean seating, and drive stability to keep production on pace.
Sold In: 2500 Each
