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The Quickscrews #9 x 2-1/2-inch flat head assembly screw is a coarse-thread, square-drive fastener built for joining cabinet panels, solid wood frames, and structural wood assemblies where a flush-seated, holding screw is needed through typical 3/4-inch material and into a second member.
At 2-1/2 inches, this screw is well matched to cabinet carcass construction where both thickness and depth matter. Driving through a 3/4-inch panel leaves approximately 1-3/4 inches of thread in the receiving member, providing solid engagement in a second panel, a face-frame rail, or a structural stretcher. That thread depth suits side-panel-to-bottom-panel connections, upper cabinet hanging strips, and anywhere a single-pass fastener needs to span a material interface and lock the joint without racking. It is also a practical length for attaching nailer strips and blocking inside a cabinet box where shorter screws would not reach and longer ones would risk breakthrough.
The flat head seats flush through the combination of its countersunk profile and the underhead nibs, which mill the countersink as the screw is driven. This avoids a two-step drill-then-drive workflow in most softwood, plywood, and MDF applications. The Type 17 Auger point adds a longitudinal flute that cuts wood fiber and clears material ahead of the thread, which reduces both driving torque and the splitting pressure a plain sharp point can create near edges or end grain. The zinc finish provides corrosion protection suitable for controlled indoor environments. This screw is for dry, interior woodworking and cabinet assembly — not for outdoor or pressure-treated lumber applications.
This screw is a natural fit for cabinet manufacturers, shop carpenters, and millwork installers who drive a high volume of fasteners through standard 3/4-inch sheet goods and into solid wood or engineered panel members. The 2500-count box supports extended production runs without frequent restocking. Square drive keeps bit changes to a minimum and the #2 recess is compatible with the square bits common in most production and installation kits. For shops building frameless or face-frame cabinets in softwood species, plywood, MDF, or particleboard, the coarse thread and auger point combination handles the material mix without requiring separate screws for each substrate.
The 2-1/2-inch length is well matched to driving through 3/4-inch stock and into a second member, leaving about 1-3/4 inches of thread engagement in the receiving piece. It works for panel-to-panel joints, nailer strips, and structural connections inside a cabinet box.
In most softwood, plywood, MDF, and particleboard applications, the nibs mill the countersink as the screw seats, so a separate countersink step is typically not needed. In very hard or dense wood, a pilot countersink can improve the result.
Yes. The #2 square recess fits the standard #2 Robertson-style square bit common in most shop and installation driver kits. Bit retention works best with a correctly sized, unworn bit.
No. The zinc finish is suited for dry indoor environments. For exterior work or pressure-treated lumber, a corrosion-rated coating is required.
Coarse thread is the right choice for softwood, plywood, MDF, and particleboard. It grips wood fiber and engineered panel material effectively. For dense hardwood, a fine-thread option would reduce splitting risk.
The Quickscrews #9 x 2-1/2-inch flat head assembly screw gives cabinet shops and wood assembly operations a reliable, volume-ready fastener that starts cleanly, seats flush, and holds in the materials they work with most.
Sold In: 2500 Each