The Würth #8 x 1-5/8" flat head assembly screw is a coarse-thread, zinc-plated fastener built for cabinet carcass construction, panel assembly, and general woodworking joinery. At 1-5/8 inches, it drives cleanly through 3/4-inch sheet goods and into a second panel with enough thread engagement to pull the joint tight and hold it.
The 1-5/8-inch length positions this screw squarely in the range used for joining 3/4-inch cabinet panels. Driving through one 3/4-inch side and into a mating piece, the screw puts nearly a full inch of thread into the second member — enough engagement to hold a cabinet carcass joint under load without bottoming out or blowing through a thinner panel back. Cabinet shops building face-frame boxes, carcass sides, and partition panels reach for this length repeatedly throughout a production day because it covers the most common panel-to-panel scenario without needing to switch to a longer screw.
The flat head countersinks flush, and the milling nibs on its underside cut a clean seat in wood-based materials as the head descends — useful in hardwood face frames and laminated surfaces where a rough countersink would show through a finish. The Type 17 Auger point handles the entry. Its longitudinal flute clears wood fibers as the screw starts, reducing the radial pressure that splits material near edges and in denser engineered panels. The result is a screw that starts cleanly, drives without fighting the material, and finishes flush.
This is a production interior screw. Cabinet shops assembling plywood or particleboard carcasses, finish carpenters fastening solid-wood components to panel substrates, and millwork installers joining MDF trim and built-in components will find the combination of coarse thread, Type 17 point, and flat head with nibs well matched to those materials. The zinc finish is suited to dry, climate-controlled environments — interior cabinetry, shop-built furniture, and finished millwork. For outdoor or high-humidity applications, choose a screw with a corrosion-resistant coating rated for that exposure.
Driving through 3/4 inch of material leaves roughly 7/8 inch of thread in the second panel. That thread engagement is enough to pull the joint tight and hold it under typical cabinet load, while stopping well short of penetrating a 3/4-inch back panel on the far side.
The nibs are small milling ridges on the underside of the flat head. As the head seats, they cut a countersink in the surrounding material rather than compressing or tearing it. In hardwood and laminated surfaces this produces a cleaner, flatter seat than a plain flat head would leave.
Yes. The coarse thread is well matched to the fiber structure of MDF and particleboard. The Type 17 Auger point reduces driving torque, which matters in denser MDF where standard sharp-point screws can require more force and risk head stripping.
This is a coarse-thread screw with a flat countersunk head, which suits softwood and engineered-panel face-frame applications. For hardwood face frames in maple, oak, or cherry, a fine-thread face-frame screw with a washer or pan head is the better choice — the fine thread resists splitting in tight-grained hardwood, and the broader head pulls the joint without wedging.
Yes. The drive size is #2 Phillips, which is standard across most shop and site drivers. Use a properly sized bit in good condition — a worn bit increases the chance of cam-out at the torque levels needed to fully seat a flat-head screw flush.
With 5,500 screws per box, this Würth assembly screw is stocked for the pace of a working cabinet shop — enough volume to carry through a run of carcasses without counting inventory mid-job.
Sold In: 5500 Each
