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The Würth #8 x 3" flat head assembly screw is built for cabinet and woodworking applications where full thread engagement through thicker stock is the job. The extra length pulls joints tight in doubled-up panels, deep carcass walls, and stacked material — situations where shorter screws simply run out of bite before the head seats.
Most cabinet assembly screws top out at 2 inches or shorter, which is the right call for a single 3/4-inch panel. When the job involves two panels laminated together, a thick face-frame attached to a 3/4-inch box side, or a backing rail let into deeper stock, the screw needs to travel further before the threads do their work. The 3-inch length keeps the threaded section in solid material even when the near-side stock is an inch or more thick. That matters for pull-out resistance and for drawing the joint closed. Cabinet shops building custom furniture pieces, island carcasses with reinforced sides, or commercial casework with doubled end panels keep this length on hand specifically for those moments.
Driving a screw 3 inches into wood-based material generates more friction and more heat than a shorter drive. The turbo thread profile reduces the torque needed to advance the screw, and the factory lubricant lowers friction along the full shank. Together they make deep driving noticeably smoother and reduce the risk of stripping the head recess before the screw seats. The flat head with underhead nibs does the countersinking work as it drives — the nibs mill the wood fibers so the head finishes flush without a separate countersink operation in softwood, plywood, MDF, and particleboard. For applications where a flush result matters on visible or painted surfaces, that saves a step and removes the risk of an off-center countersink.
Production cabinet shops running 3/4-inch and thicker carcass material will find the most use here, particularly when building reinforced end panels, attaching thick sub-tops, or joining any assembly where two or more layers of sheet stock stack up. Furniture builders working in solid wood or laminated panels for benches, islands, and media units use the length for the same reason. The 1,000-piece box suits shops going through volume on a run of identical pieces. The combo drive keeps the line moving regardless of whether the driver is loaded with a Phillips or a square bit.
The combo recess accepts both a #2 Phillips bit and a #2 square bit in the same opening. You do not need a specialty bit — either of the two most common drive sizes in a woodworking shop will engage the head.
The lubricant on Würth assembly screws is a dry-to-the-touch coating on the thread and shank. It is not a wet oil. It does not typically interfere with wood glue or finish, but if glue bond at the screw location is critical, drive the screw before applying glue rather than into a wet glue line.
The sharp point is optimized for softwood, plywood, MDF, and particleboard. In dense hardwoods like maple or oak, pre-drilling is recommended to reduce splitting risk and protect the head recess from stripping on the deep drive. The turbo thread and lubricant help, but a pilot hole is the safer call in tight-grained hardwood.
For a standard 3/4-inch near-side panel, approximately 2-1/4 inches of thread engages the receiving piece — well beyond what most joints require. For doubled 3/4-inch panels (1-1/2 inches total near-side), about 1-1/2 inches of thread reaches the substrate. Match the near-side thickness to the joint so the threaded section fully enters the receiving material.
This is an indoor assembly screw. The finish is not rated for exterior or high-moisture environments. Keep it on interior cabinet, furniture, and casework applications.
When the joint is deeper than a standard screw can handle, the Würth #8 x 3" assembly screw delivers full thread engagement, a flush-seating flat head, and the combo drive flexibility to keep assembly moving without slowing down to swap bits.
Sold In: 1000 Each
