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The Quickscrews #9 x 3-inch Flat Head Assembly Screw gives cabinet shops and installers the extra length needed to fasten through thicker panels and stacked assemblies while still seating flush at the surface. A coarse thread, Type 17 Auger point, nibs, and #2 square drive work together to make a clean, flush installation in wood-based materials.
Most assembly screws top out at 2 or 2-1/2 inches, which is enough for single-layer panels. The 3-inch length steps in when the joint demands more: fastening a face frame through a thick cabinet side, anchoring a back panel into a solid wood cleat, securing a shelf support through two layers of plywood, or running a screw through nominal lumber into a substrate beneath. The coarse thread engages enough material across that full depth to hold the joint securely without relying on the tip alone for grip. The Type 17 Auger point clears chips efficiently over that longer travel, which helps keep driving torque manageable even as the screw works deeper into the material.
The flat head profile countersinks cleanly across softwood, plywood, particleboard, and MDF. The nibs on the underside of the head mill wood fibers as the screw seats, helping the head settle flush without a pre-drilled countersink in most wood-based substrates. The black finish keeps heads visually subdued in cabinet interiors, dark-stained panels, and finished casework where a silver or zinc head would stand out. These screws are suited to dry indoor assembly work.
Cabinet shops running production on thicker panel assemblies, face-frame-to-box construction, or furniture carcasses that call for screws through doubled stock will get the most from this size. Installers pulling cabinets together on site or securing cleats and blocking into existing structures benefit from the length when access is limited and the joint needs to hold without a second fastener. At 2,000 screws per box, the pack quantity suits shops that go through assembly screws regularly rather than by the handful.
The 3-inch length is the right call when the joint passes through more than one layer of material or when the receiving substrate is set back from the fastening face. A shorter screw may not reach enough material for a secure hold in those situations.
The Type 17 Auger point has a flute near the tip that cuts wood fibers and clears chips as the screw advances. On a longer screw traveling through thick stock, that chip clearing helps keep driving torque lower and reduces the risk of splitting near the end of the travel.
In softwood, plywood, MDF, and particleboard, the nibs typically mill a clean countersink as the head seats. In very hard or dense materials, a pre-drilled countersink will produce a cleaner result.
This screw has a coarse thread, which is best matched to softwood, plywood, and engineered panels. For hardwood face frames in maple, oak, or similar species, a fine-thread screw is a better fit to avoid splitting and provide adequate holding power.
It accepts a #2 square drive bit. The square recess is designed to hold the screw on a correctly sized bit for one-handed placement.
When the joint is thicker than a single panel and a standard screw length leaves the connection short, this Quickscrews #9 x 3-inch assembly screw gives you the reach to fasten through with a flat, flush head and the grip to hold it there.
Sold In: 2000 Each