The Würth #8 x 2-1/2" flat head assembly screw brings together a square drive, Type 17 Auger point, coarse thread, and underhead nibs in a length suited to joining two full-thickness cabinet panels or securing a face component through substantial stock. It is the go-to size when a shorter screw would not reach and a longer one would over-penetrate.
At 2-1/2 inches, this screw reaches comfortably through one 3/4-inch panel and well into a second, or drives through nominal 2x stock into a mating member without bottoming out short. That makes it a natural fit for cabinet carcass assembly where panels are stacked or doubled up, for attaching a face frame through a combined thickness of face and box material, and for securing back panels or blocking in thicker applications. When the job calls for genuine grip depth rather than a surface connection, the 2-1/2" length delivers thread engagement that shorter variants cannot.
The square drive recess and a correctly sized #2 bit work together so the screw seats on the bit without a second hand holding it in place, which matters when the other hand is steadying a panel. The Type 17 Auger point does more chip clearing work than a standard Type 17, so it handles the deeper drive path this length requires in hardwood, dense plywood, or thick MDF. Once the screw approaches full depth, the flat head with nibs mills its own countersink rather than relying on a pre-drilled recess to land flush. These three elements work as a system: the drive holds the setup, the point clears the path, and the head finishes clean.
The coarse thread and zinc finish position this screw for indoor cabinet and woodworking assembly where moisture and corrosion are not factors. Cabinet shops running production box builds, face-frame attachment, or drawer-box assembly in plywood and solid wood will get the most from this length. Finish carpenters securing built-ins and millwork installers joining panels at depth will also find it useful. For outdoor, treated lumber, or high-humidity applications, a screw with a corrosion-rated finish is the right choice instead.
The 2-1/2" length provides thread engagement through stacked or doubled panels, or through nominal 2x stock, where a 1-1/2" or 2" screw would not reach the second member with enough thread depth to hold securely.
The Type 17 Auger point has a longer, more aggressive flute than a standard Type 17. That extended flute clears chips more completely over a deeper drive path, which reduces driving resistance and splitting risk in thick or dense material.
In most cabinet-grade wood and plywood, the nibs mill a clean flat-head countersink as the screw seats, so a separate countersink step is often not needed. In very hard species or dense laminates, a light pre-countersink pass can improve the finish result.
Yes, when the combined thickness of the face-frame stock and the cabinet panel calls for a longer fastener. The flat head, coarse thread, and Type 17 Auger point are appropriate for attaching softwood or hardwood face frames to plywood or sheet-good cabinet boxes from the back side.
No. The zinc finish is rated for dry interior environments. Outdoor or pressure-treated lumber applications require a corrosion-resistant coating such as a hot-dip galvanized or ACQ-compatible finish.
When the joint needs more than a surface connection, the 2-1/2" length, coarse thread, and Type 17 Auger point combine to deliver the holding depth that production cabinet and casework assembly demands.
Sold In: 1000 Each
