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The Würth #10 x 4" flat head assembly screw is a heavy-gauge, full-length fastener for joining thick panels, cabinet carcasses, and wood assemblies where shorter screws won't reach. The coarse thread grips wood and engineered panel materials, the sharp point self-starts without a pilot hole, and the lubricated finish reduces driving torque so the screw seats cleanly under power tools.
At 4 inches and #10 gauge, this screw is suited to connections where material thickness demands a longer fastener: assembling cabinet boxes from 3/4-inch panels with backing, joining thick case goods and face-frame boxes, or pulling heavy-wall subassemblies together. The coarse thread provides strong withdrawal resistance in plywood, MDF, solid wood, and OSB — the materials most commonly found in cabinet and furniture carcass work. The flat head countersinks flush when a pre-drilled countersink is used, keeping exposed surfaces clean on visible interior faces.
The lubricated finish on this screw is a practical advantage in production work. Driving a long, heavy-gauge screw through dense or multi-layer material generates significant friction. The lubricant on the thread and shank reduces that resistance, helping the screw seat fully without excessive torque that can strip a Phillips recess or overdrive the head. This matters most in repetitive assembly runs where driver fatigue and bit wear are real costs. The finish is dry to the touch, so screws handle cleanly in high-volume use.
Cabinet shops assembling thick-panel carcasses, millwork operations joining case components, and contractors installing built-ins or heavy casework will find this length and gauge useful when standard 2-inch or 2-1/2-inch screws fall short. The #2 Phillips drive matches the most common driver bits already in rotation, and the 800-count box supports a sustained production run without frequent restocking.
The sharp point self-starts in most wood and engineered panel materials without a separate pilot hole. For hardwood or fastening very close to an edge, a pilot hole helps prevent splitting.
The lubricant reduces friction between the screw thread and the material as it drives, lowering the torque needed to fully seat a long, heavy-gauge screw. It is dry to the touch and does not affect surface finishing around the fastener.
A flat head requires a matching countersink to sit flush. Without one, the head will stand proud of the surface. In soft materials it may self-countersink partially, but a pre-drilled countersink is recommended for a clean, flush result.
Coarse thread performs well in solid wood, plywood, OSB, and most engineered panel materials. It is the standard thread form for wood-to-wood and panel assembly applications.
Each box contains 800 screws.
When the joint is thick and the material is dense, this Würth #10 x 4" assembly screw delivers the length, gauge, and lubricated performance to close the connection without fighting the driver.
Sold In: 800 Each
