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The Würth #8 x 2-1/2" flat head assembly screw is a coarse-thread, lubricated fastener with a sharp point and #2 square drive. The extra length makes it the right reach for thicker stock joints, cabinet case assembly through panel stock, and anywhere you need the screw to fully engage the second member without switching to a longer fastener.
Most assembly screws in the 1-1/4 to 2 inch range are sized for single-thickness panel joinery. At 2-1/2 inches, this screw reaches through one layer of 3/4-inch panel stock and bites deep into the second member, giving the joint the thread engagement it needs to stay tight under load. That makes it a natural fit for cabinet box assembly where carcass sides, tops, and bottoms come together, for attaching wood cleats and mounting rails to cabinet backs, and for built-up panel applications where combined material thickness calls for more screw. Shops building frameless cabinets in volume often keep a 2-1/2 inch screw alongside shorter sizes specifically for the cases where a shorter fastener would leave the threads short of full engagement.
Coarse thread is the right choice when the material is softwood lumber, plywood, melamine-faced particleboard, MDF, or pine. The wider thread pitch grabs more fiber per revolution and pulls the joint together efficiently. The lubricated finish on this screw reduces the friction load during driving, which matters most when you are running screws back to back on a production cabinet line. Lower driving torque means less heat at the bit, less fatigue on the driver motor, and a head that seats cleanly without burying. The flat head profile keeps the surface flush, which is important in visible cabinet interiors and anywhere a proud head would interfere with a drawer box, shelf, or fitting.
This is a production shop screw. The 1000-piece box is sized for cabinet manufacturers, millwork shops, and frameless casework builders who go through assembly screws in volume and need a consistent, ready-to-drive fastener that does not slow the line. The #2 square drive is standard on most cabinet shop driver setups, so there is no bit change required when moving between tasks. Installers assembling pre-finished cabinets on site will also find the 2-1/2 inch length useful for attaching mounting rails and backing strips where a shorter screw would not reach solid material behind the panel face. This screw is for indoor, dry applications — the lubricated finish is a friction reducer, not a corrosion coating.
The 2-1/2 inch length threads fully through 3/4-inch panel stock and into the second member with enough depth to hold the joint under load. Shorter screws work fine for single-thickness applications, but built-up stock or through-panel joinery often needs the extra reach this length provides.
Coarse thread is well suited for softwood lumber, plywood, particleboard, MDF, melamine panels, and pine. It grips the fiber structure of these materials efficiently. Fine thread is the better choice for hardwood face frames where splitting is a concern.
The lubricant coating reduces friction between the screw threads and the material as the screw is driven. That lowers the torque required to fully seat the screw, which is most noticeable in production work where hundreds of screws are driven per day. It is not a corrosion-protection coating.
No. The lubricated finish provides friction reduction only and offers no meaningful corrosion resistance. This screw is for dry, indoor woodworking and cabinet assembly. For outdoor or treated-lumber work, use a fastener rated for exterior exposure.
In softer materials like pine and particleboard, the flat head will typically self-countersink as the screw is driven. In harder woods or laminated panels, pre-drilling a countersink will produce a cleaner, more consistent flush seat.
When the assembly calls for a screw that reaches through panel stock and locks the joint without slowing the line, the Würth #8 x 2-1/2" flat head assembly screw in a 1000-piece box is stocked for exactly that purpose.
Sold In: 1000 Each
