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The Würth #8 x 1-5/8 inch flat head assembly screw is a coarse-thread fastener built for joining 3/4-inch panels, cabinet boxes, and interior wood assemblies where a flush-seated head and reliable holding power are the priority. The combo drive recess accepts a #2 Phillips or a #2 square bit in the same head, and the Type 17 Auger point starts cleanly in both softwood and engineered panels without a pilot hole.
At 1-5/8 inches, this screw reaches comfortably through one layer of 3/4-inch material and drives firmly into a second, which is the joint geometry that shows up repeatedly in cabinet box assembly: side panel to bottom, stretcher to side, rail to gable. The length gives enough thread engagement to hold the joint without over-penetrating a panel back or punching through a face frame. It also works well for attaching drawer guide strips, nailers, and interior blocking where a shorter screw would not reach and a longer one would risk blow-through. Production cabinet shops that build primarily with 3/4-inch sheet goods will find this length covering the widest range of recurring connections on the box.
The combo recess is designed to hold the screw on a correctly sized bit for placement, which matters when one hand is steadying a panel and the other is on the driver. The square geometry resists cam-out under the higher torque that a production driver produces, while Phillips compatibility means the screw remains accessible when a square bit is not at hand. The Type 17 Auger point does more work at startup than a standard sharp point: the extended auger flute cuts and evacuates wood fiber ahead of the thread, which is why this point style is the default choice for dense substrates and engineered panels where a plain tip tends to wander or stall. Once the shank is seated, the flat head nibs mill the countersink on the way down, so the head finishes flush in most wood-based materials without a pre-drilled recess.
Cabinet shops running 3/4-inch sheet goods day in and day out are the natural home for this screw. The 5,000-piece box matches production volume and avoids the constant restocking that smaller packs require. Finish carpenters and installers working site-built casework, built-ins, or shop-built millwork will find the length, head style, and drive combination handles the majority of panel-to-panel and panel-to-frame connections that come up on a typical job. For interior work in dry environments, the zinc finish is the right choice: it provides standard indoor corrosion protection without the added cost of a heavier coating that an interior application does not need.
The combo drive recess accepts both a #2 Phillips and a #2 square bit in the same head. Either works; a correctly sized square bit will give better torque transfer and less cam-out under power driving.
The coarse thread and Type 17 Auger point are well suited to MDF, particleboard, and plywood in addition to softwood. These engineered panels make up most of the material in a production cabinet box, which is the primary use case for this screw.
Not in most wood-based materials. The nibs on the underside of the flat head mill the countersink as the screw seats, so the head finishes flush without a separate countersink step in typical cabinet panel stock.
This screw is intended for dry, indoor applications. Zinc plating provides adequate protection in climate-controlled shop and interior install environments. For outdoor or high-moisture applications, a corrosion-resistant coating rated for that exposure is the right choice.
Driving through one 3/4-inch panel leaves roughly 7/8 inch of thread in the receiving piece, which is enough engagement to hold the joint firmly without the tip punching through the far face of a standard panel. That balance makes 1-5/8 inch the go-to length for panel-to-panel cabinet box connections.
When most of what you build is 3/4-inch sheet goods and the work is indoors, this Würth assembly screw covers the joints that matter: the right length for the stock, a head that seats flush without extra setup, a point that starts reliably in engineered panels, and a drive that works with the bits you already carry.
Sold In: 5500 Each
