Würth #8 x 3" Flat Head Assembly Screw Square Drive - Type 17 Auger Point Coarse Thread Black, 3670000350961 2000 - 2000/Box

3-Inch Assembly Screw for Thick Stock and Deep Panel Joints

The Würth #8 x 3" Flat Head Assembly Screw is a coarse-thread wood screw built for cabinet and casework joints where the connection spans substantial material thickness. The square drive, Type 17 Auger point, and flat head with nibs work together to seat cleanly and hold reliably across the full 3-inch length.

Key Features

• #2 Square drive holds the screw on a correctly sized bit for controlled placement in tight assembly positions.
• Type 17 Auger point clears wood fibers as the screw drives, reducing splitting in dense stock and thick panels.
• Flat head with nibs mills a clean countersink as the head seats, leaving a flush surface without a separate countersink step.
• Coarse thread provides strong pull-out resistance in solid wood, plywood, and engineered panels.
• Black finish reduces visual contrast against dark interior surfaces and painted cabinet interiors.
• 2000-piece box supports continuous production runs without frequent restocking.

Where the 3-Inch Length Earns Its Place

A 3-inch screw reaches into material that shorter screws cannot. That extra length matters when fastening through a full 3/4-inch panel into a solid wood cleat, connecting doubled-up stock, or anchoring cabinet components where the joint demands deep thread engagement to resist racking and pull-out. Typical cabinet screws in the 1-1/4 to 1-5/8 inch range are sized for thinner stock. This one is sized for the applications where penetration depth is the deciding factor: thick face frame material, stacked lumber, sub-top attachment, and similar joints that need a screw that runs deep.

Black Finish, Flat Head, and Nibs

The black finish on this screw keeps fastener heads visually quiet on dark melamine interiors, painted cabinet boxes, and natural wood surfaces where a silver screw head would stand out. The flat head design seats flush at the surface when driven into a countersink. The nibs under the head do the countersink work themselves, cutting into the wood fiber as the head approaches the surface so the screw seats cleanly in solid wood, plywood, and hardwood panels without a separate prep step. The coarse thread engages the wood fiber efficiently across the 3-inch shank, and the Type 17 Auger point clears chips to reduce the splitting risk that longer screws can create in dense material.

Production Volume and Who This Is For

Cabinet shops running thick-panel assemblies, millwork teams fastening sub-tops and cleats, and installers connecting structural cabinet components to framing are the natural audience for this SKU. The 2000-piece box size aligns with production volumes where running out mid-job creates a real problem. Because this screw handles the heavier-duty end of interior wood assembly, it pairs well with shops that keep shorter assembly screws for lighter joinery and reach for the 3-inch size when the joint calls for it. All applications here are interior. This screw is not rated for exterior or treated-lumber use.

Common Questions

The Right Reach for Deep Wood Joints

When the joint is thick, the stock is dense, or the connection has to hold under load, the Würth #8 x 3" Flat Head Assembly Screw gives you the length, point, and head geometry to drive cleanly and seat flush — box of 2000 ready for the work ahead.