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The Würth #8 x 2-1/2" Flat Head Assembly Screw is a production-ready fastener built for wood joints that need full-depth thread engagement. The 2-1/2" length reaches deep enough to pull thick panels, frames, and stacked stock tight without relying on adhesive alone. Coarse thread, a Type 17 Auger point, underhead nibs, and a #2 Phillips drive work together to make this a fast, clean choice for cabinet shops running these joints in volume.
Most cabinet assembly screws in the 1" to 1-1/2" range are sized for face-to-face panel joints in 3/4" stock. When the joint stacks thicker material — a hardwood face frame over a plywood box, a solid-wood edge banding against a doubled panel, or a structural interior partition built from 1-1/2" material — a shorter screw runs out of thread before the head seats. The 2-1/2" length keeps thread engagement high through the full joint depth, so the head pulls the surfaces together the way it should. It also works well for attaching cabinet boxes to wall blocking or framing where the fastener has to pass through a panel before reaching the structure behind it.
The Type 17 Auger point is an extended version of the standard Type 17, with a longer, more aggressive auger-style flute. That flute clears chips ahead of the thread, which lowers the torque needed to drive the screw and reduces the pressure that causes splitting near edges and ends. Paired with the coarse thread, which displaces material efficiently in wood fiber, the screw drives with less pushback in both softwood and hardwood. The flat head carries underhead nibs that act as milling cutters as the head spins down into the surface, producing a clean, flush countersink in wood and wood-based panels without a pilot step.
The zinc finish on this screw is right-sized for the application: dry, climate-controlled shop and site conditions where standard corrosion protection is sufficient. For cabinet shops assembling frames, boxes, and interior components in a controlled environment, there is no need to pay for a heavier exterior coating. The pail pack of 2,500 pieces supports production use — keep it at the bench or on the cart and reload without counting. Pail packaging is convenient for movement around the shop or to the job site. Designers and contractors specifying interior casework for kitchen, bath, or commercial millwork projects will find the gauge, length, and pack size aligned with medium-to-heavy production output.
When the joint involves stacked or thicker stock — a face frame over a plywood box, a doubled panel, or a through-panel-to-framing connection — a 1" or 1-1/2" screw may not reach enough material to seat the head properly. The 2-1/2" length keeps thread engagement high through the full depth so the joint closes the way it should.
The Type 17 Auger point has an extended flute that removes chips ahead of the thread as the screw drives. This lowers driving torque and reduces the splitting pressure that a sharp gimlet point creates, especially in dense wood or when fastening close to an edge.
Not in most wood and wood-based substrates. The nibs on the underside of the flat head mill their own countersink as the screw seats, so the head ends up flush without a separate drill step. In very dense hardwood, a shallow pilot may improve the result.
No. The zinc finish on this screw is rated for dry indoor conditions. For pressure-treated lumber, exterior decking, or high-moisture environments, use a screw with a corrosion-resistant coating rated for those exposures.
A standard #2 Phillips bit drives this screw. That size is the most common Phillips bit in both shop and field kits, so no special tooling is needed.
When the stock is thick and the joint needs full engagement, the 2-1/2" reach of this screw keeps the assembly tight, flush, and ready for the next step on the line.
Sold In: 2500 Each
Quantity | Unit Price | Catalog | ||||
|---|---|---|---|---|---|---|
Sold in: 10 Each |  WW614176461 Mfr# 0614176461005 10 | #2 x 1" Phillips Drive Insert Bit (10/Bag) |