The Würth #8 x 3" flat head assembly screw reaches where shorter screws can't — making it the right choice when stock thickness, layered panels, or joint depth calls for more thread engagement. It combines a coarse thread, Type 17 auger point, flat head with nibs, and a #2 Phillips drive in a black finish, packed 2000 to the box.
Most assembly screws in this gauge top out at 2 or 2-1/2 inches, which is enough for standard 3/4-inch carcass work. The 3-inch length is the right call when you're fastening through thicker substrates — joining two 3/4-inch panels with a backing cleat, running a screw through a face frame into a thicker secondary rail, or anchoring a cabinet box to a nailer or wall cleat where you need the thread to reach well past the near face. It's also a common length for attaching hardware-backing blocks inside cabinet interiors, where the screw needs to penetrate deep enough to hold under repeated load. The coarse thread and Type 17 auger point work together to pull the joint tight without requiring a pilot hole in most softwood and plywood applications.
The flat countersunk head is designed to sit flush with or just below the wood surface. The underhead nibs do the countersinking work as the screw seats, milling away wood fiber so the head drops in cleanly — especially useful in hardwood and dense plywood where a standard flat head would stand proud without a pre-drilled countersink. The black finish reduces the visual contrast of the fastener head against dark cabinet interiors, melamine-lined boxes, and stained or painted wood surfaces. It's not a corrosion coating, so this screw is for interior woodworking and assembly work.
At 2000 screws per box, this SKU is aimed at shops and installers who go through fasteners in volume. The #2 Phillips drive means any technician on the line can grab a standard bit and keep moving — no specialty drive required. This screw suits cabinet production shops, millwork operations, and site installers who need a reliable deep-reach screw for carcass assembly, panel lamination, and interior wood-to-wood connections. It's not the screw for deck work or exterior exposure, but for dry indoor assembly it covers a wide range of situations where 3 inches of reach makes the difference.
When you're fastening through stacked panels, thick face-frame stock, or into a nailer or cleat behind the cabinet box, the extra length keeps the thread engaged well past the near surface. For standard 3/4-inch carcass panels joined face-to-face, a shorter screw is typically enough. The 3-inch length is the better call when depth of engagement is the priority.
In softwood and most plywood, yes — the nibs mill the countersink as the head seats. In harder materials like maple or oak, a pre-drilled pilot and countersink will give a cleaner result and reduce the chance of surface tearout around the head.
No. The black finish on this screw is not rated for exterior exposure or contact with ACQ pressure-treated lumber. Keep it to dry interior assembly work.
The Type 17 point has a longitudinal flute that clears wood fiber as the screw drives. In thick or dense stock — exactly where a 3-inch screw is most likely to be used — that chip-clearing action reduces driving torque and lowers the risk of splitting near the tip.
Yes. A #2 Phillips bit in a drill/driver or impact driver works fine. Keep in mind that impact drivers at high torque can overdrive flat head screws past flush, especially in softer materials, so a clutch-equipped drill or a driver set to a controlled torque is the better choice for finish-visible surfaces.
When the joint calls for more than a standard-length screw can deliver, this #8 x 3" Würth assembly screw provides the depth, the thread engagement, and the flat seated finish that interior cabinet and panel work demands.
Sold In: 2000 Each
