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The Würth #8 x 3" Flat Head Assembly Screw is a coarse-thread wood screw built for cabinet assembly, furniture joinery, and woodworking applications where 3-inch penetration is the right call. The combo drive accepts both a #2 Phillips and a #2 square bit, and a Type 17 Auger point with milling nibs under the flat head rounds out the package.
Most assembly screws top out at 2 or 2-1/2 inches, which is enough for standard panel-to-panel joints in 3/4-inch stock. The 3-inch length is the right reach when stock thickness stacks up: attaching a face frame to a cabinet box where the combined depth runs past two inches, securing thick solid-wood components, fastening carcasses built from doubled panels, or anchoring blocking and nailers that need to land well into the framing behind them. The extra length also makes this screw a natural choice for through-panel connections where pull-out resistance matters more than minimal penetration.
The combo drive accepts a #2 Phillips or a #2 square bit in the same recess, which keeps the screw usable whether the driver at hand is loaded with one or the other. The square recess is designed to hold the screw on a correctly sized bit for steadier one-handed placement in tight spots. The Type 17 Auger point goes to work before the thread does: its extended flute cuts into wood fibers ahead of the thread lead, reducing the torque needed to drive a 3-inch screw through thick material and lowering the risk of splitting near the end of a long drive. Once the head approaches the surface, the nibs under the flat head mill the countersink clean, so the head seats flush without tearing the face of the panel.
Cabinet shops building face-frame boxes in solid wood or mixed-material carcasses, furniture makers joining thick stock, and finish carpenters fastening through assemblies where shorter screws come up short will find the 3-inch length fills a specific gap in their fastener rotation. The 1,000-count box suits production environments where a consistent, high-quality screw at this length needs to be available in volume. The black finish fits naturally into shops that prefer a low-visibility fastener in stained or painted interiors. This screw is for interior woodworking and cabinet assembly; it is not rated for exterior or wet environments.
A 3-inch length works when stock thickness adds up past what a 2 or 2-1/2-inch screw can bridge effectively — doubled panels, face-frame-to-box joints in thick hardwood, or any connection where you need deeper thread engagement for pull-out resistance.
Both a #2 Phillips and a #2 square bit fit the same recess. The square geometry is designed to hold the screw on a correctly sized bit for one-handed placement; a well-fitted Phillips bit will drive the screw reliably but does not offer that same retention.
On a 3-inch screw, the extended auger flute matters more than it does on shorter lengths because the driver has to push through more material. The flute clears wood fibers ahead of the thread, reducing driving torque and lowering the chance of splitting as the screw works deeper into the stock.
Not in most wood substrates. The milling nibs under the flat head cut the countersink as the screw seats, so the head sits flush without a separate countersink step. In very hard hardwoods or dense engineered panels, a shallow pilot can help the head seat cleanly.
No. The black finish on this screw is for interior woodworking and cabinet assembly. For exterior applications, choose a screw with a corrosion-rated coating appropriate to the exposure and lumber type.
When the joint calls for 3 inches of reach, this Würth assembly screw delivers it with a drive that fits the bits already on your belt, a point that handles thick stock without fighting it, and a head that seats flush and stays unobtrusive.
Sold In: 1000 Each
