Order by 24/7 by web, contact our sales reps or call by phone.
What you need, when you need it, all in one place.
Most orders ship same day.
Advice and support from knowledgeable professionals.
The Würth #8 x 3-inch flat head assembly screw is built for wood-to-wood joints where the fastener needs to reach well into the second member. With a #2 square drive, coarse thread, lubricated finish, and a flat head designed to sit flush, this screw handles the deeper-penetration work in cabinet carcass assembly, face-frame attachment, and built-up panel joinery.
Most cabinet assembly screws land in the 1-inch to 2-inch range, which is enough for joining panels of standard thickness edge-to-face. When the joint involves thicker stock, two layers of 3/4-inch material, or a connection that needs serious pull strength, a 3-inch screw changes the outcome. The full inch of additional penetration into the second member means more thread engagement, more withdrawal resistance, and less chance of the joint working loose over time. That matters in cabinet box construction where the bottom panel carries shelf load, in carcass-to-wall attachments, and in any assembly where the wood on the far side of the joint is doing real work. For shops running cabinets with solid wood or thicker engineered panel components, having this length in the drawer is not a workaround — it is the right tool for a specific joint type.
The lubricated finish on this screw reduces the friction between the thread and the wood as it drives. In a single-piece install that difference is minor. Across a full day of cabinet assembly — hundreds of screws, repeated driving cycles, and a driver motor that accumulates heat — the lower torque per screw adds up to less fatigue and more consistent seating depth. The #2 square drive complements that by staying in the recess cleanly. The square socket geometry is designed to hold the screw on the bit, which matters when you are reaching into a cabinet interior or driving at an angle where the other hand is occupied holding the workpiece. Neither feature is a substitute for the right technique, but both support faster, more consistent work at volume.
This screw works well anywhere coarse-thread wood fastening is done in softwood, plywood, MDF, particleboard, or pine and the joint calls for more reach than a standard-length screw provides. Cabinet shops building face-frame cabinets with solid wood sides will use this length when attaching the face frame to the box, where the combined thickness of the face-frame stock and the panel edge makes a shorter screw insufficient. Site installers building out custom closet systems, entertainment walls, or built-in shelving encounter the same situation when securing a structure to a backing panel or joining a stile to a thicker upright. The 1500-count box is sized for shops that move through fasteners at production pace, not for the occasional single-project purchase.
When the joint involves two layers of thick stock, a solid wood face frame applied to a panel edge, or a connection where maximum thread engagement matters, a 3-inch length puts significantly more thread into the second member than a 1-1/2 or 2-inch screw would. That additional penetration improves withdrawal resistance where the joint carries real load.
The lubrication reduces friction during installation but does not meaningfully reduce holding power once the screw is seated. Thread engagement and coarse-thread geometry in the wood fibers determine withdrawal resistance after driving.
Coarse thread performs well in softwood, plywood, MDF, particleboard, and pine — the most common cabinet construction materials. It is not the preferred thread for dense hardwoods like maple or oak, where fine thread provides better holding power without splitting risk.
No. This version of the flat head assembly screw does not include nibs. A countersink in the workpiece is recommended for a clean, flush seating result.
No bit is included with this box. A standard #2 square drive bit fits the recess and is widely available separately.
When the assembly calls for depth — thick panels, face-frame attachment, or any joint where more thread engagement is the difference between solid and marginal — the Würth #8 x 3-inch flat head assembly screw is the length that gets the job done without compromise.
Sold In: 1500 Each
