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The Würth #8 x 3" flat head assembly screw is built for wood-to-wood connections where extra length is needed to span thick stock, multilayer panels, or deep joinery. It combines a Type 17 auger point, coarse thread, milling nibs under the head, and a combination Phillips/square drive in a zinc-plated flat head profile sized for production cabinet and furniture work.
Most cabinet and furniture work runs on 1-1/4" to 2" screws, but certain assemblies demand more reach. Joining two layers of 3/4" sheet good, fastening a carcass panel to a thick solid-wood member, running a screw through a face frame into the cabinet box, or anchoring a heavy hardwood component to a substrate all put standard-length screws at a disadvantage. Three inches of shank length means the threaded portion stays fully engaged in the receiving member even after passing through significant material thickness, keeping the joint tight and the withdrawal load where it needs to be.
The Type 17 auger point features a longitudinal flute that cuts and ejects wood fibers as the screw enters, which matters most in dense or layered material where a plain sharp point would build pressure and risk splitting. The coarse thread follows with a pitch tuned for solid wood and structural panels, maximizing the surface area in contact with wood fibers for holding power. At the surface, the flat head carries milling nibs on its underside that ream the countersink clean as the head seats. In hardwood and dense composites, that milling action means a flush result without stopping to drill a separate countersink.
The combination drive recess accepts a #2 square bit or a #2 Phillips bit. The square recess is designed to hold the screw on a correctly sized bit for controlled one-handed placement, and it handles the torque of a power driver without cam-out. Phillips compatibility keeps the screw usable when the tool situation changes on a busy shop floor or install site. At 2000 screws per box, this pack is sized for cabinet shops and production environments that burn through fasteners on every run.
Cabinet shops building face-frame boxes with thick solid-wood rails, millwork teams joining substantial hardwood components, and installers attaching cabinet carcasses to substrate walls will find this length covers the applications that shorter screws cannot. It is an indoor fastener: the zinc finish handles the dry, climate-controlled environments where cabinet and furniture assembly happens. For exterior or treated-lumber work, a corrosion-resistant coating rated for that exposure is the right call.
When you are driving through two layers of material before reaching the receiving member, a shorter screw may not leave enough thread engagement to hold the joint under load. Three inches keeps the coarse thread fully buried in the second member even after passing through thick face material or a stacked panel.
The milling nibs on the underside of the head are designed to cut their own countersink as the screw seats in wood and wood-based panels. In hardwood, the nibs remove material so the head can land flush without a separate countersink operation, though pre-drilling is always an option when working in very dense stock.
The Type 17 auger point carries a flute along the tip that cuts and clears wood fibers as the screw starts. That chip-clearing action reduces the pressure that builds ahead of the point in dense or layered material, which lowers the risk of splitting and reduces the torque needed to drive the screw fully home.
Yes. The combination drive recess accepts both a #2 Phillips and a #2 square bit. Either will drive the screw, though a correctly sized square bit offers better torque transfer and reduced cam-out under power driving.
This screw carries a zinc finish rated for dry indoor environments. It is not the right choice for exterior exposure or contact with pressure-treated lumber, where a corrosion-resistant coating designed for outdoor conditions is needed.
When the assembly calls for reach, the Würth #8 x 3" flat head combo-drive screw delivers full thread engagement, a self-countersinking head, and a drive that holds up to production-pace driving, all in a 2000-piece box ready for the shop floor.
Sold In: 2000 Each
