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Copyright © 2004-2026, Würth Baer Supply Company. All Rights Reserved.
Copyright © 2004-2026, Würth Baer Supply Company. All Rights Reserved.
The Würth #8 x 3" flat head assembly screw is built for joints that need full thread engagement through thicker material. A coarse thread, Type 17 auger point, flat head with nibs, and #2 Phillips drive make this a reliable workhorse for cabinet carcass assembly, case goods, and solid-wood construction where a shorter screw simply won't reach.
Most cabinet and case assembly calls for a 1-1/4" or 1-5/8" screw. The 3-inch length exists for situations where those fall short: fastening through a double-thick back panel, pulling a solid-wood face component into a deep substrate, connecting carcass members that are stacked or laminated, or driving into end grain where maximum thread engagement is the only way to get reliable holding power. When a joint demands depth, this is the length to reach for.
The screw body is carbon steel with a zinc finish. That combination covers standard interior woodworking, shop-built cabinetry, case goods manufacturing, and general indoor construction where the material stays dry. The milling nibs on the underside of the flat head mill their own countersink as the head seats, which keeps the face flush in hardwood, plywood, and panel materials without an extra operation. The coarse thread is sized for softwoods and engineered sheet goods. For hardwood face frames, a fine-thread screw is a better fit.
Cabinet shops running production on thick or laminated panels keep a box of 3-inch screws on hand for the joints where shorter screws come up light. Millwork crews use them when assembling deep carcasses or built-in components with extra material thickness. Custom furniture builders reach for the 3-inch when end-grain or cross-grain connections need more bite than a standard-length fastener can provide. The 2000-piece box supports shops that cycle through longer screws regularly, keeping the bin full without constant reordering.
For single 3/4-inch panels, a shorter screw is typically the better choice. The 3-inch length is most useful when driving through doubled stock, laminated panels, or into end grain where deeper thread engagement is needed for holding power.
The milling nibs on the flat head are designed to mill a countersink as the head seats in most wood and panel materials, so a separate countersink step is often unnecessary. In very hard or brittle materials, a pilot hole can still help prevent surface cracking around the head.
The Type 17 auger point has a longitudinal flute near the tip that removes wood fibers as the screw enters the material. This reduces the driving torque required and lowers the risk of splitting, particularly in denser or thicker stock where a sharp point alone would build up more pressure.
This screw carries a coarse thread, which is designed for softwoods, plywood, MDF, and particleboard. Hardwood face frames in maple, oak, cherry, or similar species call for a fine-thread screw to prevent splitting and provide adequate holding power in tight-grained material.
The zinc finish on this screw is intended for dry indoor applications. For exterior use, treated lumber, or high-moisture environments, choose a screw rated for those conditions.
When the joint calls for more reach, this 3-inch flat head assembly screw delivers full thread engagement, a flush-seating head, and the Type 17 auger point to get there without fighting the material.
Sold In: 2000 Each
