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The Quickscrews #9 x 3-inch flat head assembly screw is built for wood-to-wood connections that demand full thread engagement through thicker material. With a coarse thread, Type 17 auger point, milling nibs, and a #2 square drive, it handles the kind of deeper joinery that shorter screws cannot reach.
At 3 inches, this screw reaches into joints where a shorter fastener runs out of thread before it runs out of material. Attaching a face frame to a box built from 3/4-inch material, running a screw through a stacked panel, or pinning a cabinet back into a thicker cleat are exactly the situations where this length is the right call. It also handles through-fastening on built-up sections of dimensional lumber, pulling two pieces together with enough thread engagement to resist racking and withdrawal over time. Cabinet shops assembling larger carcasses or framers joining heavier stock will find the length suits the work without leaving thread hanging in open air.
The coarse thread is matched to the fibrous structure of softwood, plywood, particleboard, and MDF, providing reliable pull-out resistance in the materials that make up most cabinet boxes and casework panels. The Type 17 auger point goes to work before the thread engages, slicing into the material and ejecting chips so the screw drives with less resistance and less risk of splitting the substrate near an edge. The flat head with milling nibs does the same job at the other end of the fastener, milling its own countersink as it seats so the head ends up flush rather than proud. The zinc finish is appropriate for the dry, climate-controlled conditions typical of a shop or interior install.
This SKU ships 2,000 screws to a box, a quantity that makes sense for cabinet manufacturers, millwork shops, and installers who are going through screws on every job rather than pulling from a small jar. A #2 square drive bit fits the recess and is the standard bit in most cabinet shop setups, so there is no retooling to put these to work. Keep a box at the bench and another staged for site work and the supply is rarely the reason the job slows down.
A 3-inch screw drives well past the face frame and deeply into the box side, which is more thread engagement than most face-frame-to-box connections require. For that joint, a shorter screw typically gives the right thread depth. The 3-inch length is better suited to thicker stock, stacked panels, or situations where a longer reach into the receiving material is the goal.
Yes, in most softwoods, plywood, MDF, and particleboard the Type 17 auger point self-starts without a pilot hole. In very dense hardwood or near a thin edge, a pilot hole reduces splitting risk.
In most softwoods and sheet goods, yes. The nibs cut a countersink as the head seats, leaving the flat head flush without a separate operation. In harder materials, a light countersink beforehand will produce a cleaner result.
No. The zinc finish is rated for dry interior conditions. For outdoor or high-humidity applications, choose a screw with a corrosion-resistant coating designed for exterior exposure.
A #2 square drive bit. It is the standard square drive size and is widely available in shop and site bit sets.
When the connection calls for more reach, more thread, and more holding depth than a shorter screw can deliver, the Quickscrews #9 x 3-inch assembly screw is the size to pull from the box.
Sold In: 2000 Each