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The Würth #8 x 2-1/2" flat head assembly screw is a coarse-thread fastener designed for wood-to-wood and panel assembly where the joint demands more thread engagement than shorter screws can deliver. It drives with a combo Phillips/square recess, seats flush with milling nibs, and starts cleanly with a Type 17 auger point.
At 2-1/2 inches, this screw has enough shank to bridge thicker assemblies: a cabinet carcass side screwed through a 3/4-inch panel into a solid-wood cleat, back panels fastened through doubled material, or structural members where a shorter screw would lack the thread engagement needed to hold under load. It also works well when driving at an angle through pocket geometry in thicker stock, where the screw needs to travel farther before the threads fully seat. For standard 3/4-inch panel-to-panel joints, this length provides extra holding margin in applications that see racking or repeated stress.
The milling nibs on the underside of the flat head do the countersink work as the screw is driven. In hardwoods, softwoods, plywood, and MDF, the nibs mill a clean recess so the head sits flush without a separate countersink drill pass. That matters most in high-volume shops where eliminating an extra step at every fastener location adds up across a full cabinet run. The combo recess gives you the option to run a square bit for better bit retention on a correctly sized square driver, or to grab the Phillips when that is what is loaded. Either way, the same screw accepts both without a parts change at the bin.
Cabinet shops and millwork teams building face-frame carcasses, drawer boxes, or wood panel assemblies that call for a longer #8 will find this length covers the joints a 1-1/2" or 2" screw cannot. Installers securing cabinet components to backing, wood blocking, or stacked material also rely on this length when the joint depth demands it. The black finish blends into dark cabinet interiors and keeps the head from drawing the eye in finished work. With 1,000 screws per box, the pack is sized for production use rather than occasional repairs.
The extra length increases thread engagement in thicker stock and stacked panel assemblies. For joints where 3/4-inch panels meet solid wood cleats, blocking, or doubled material, 2-1/2 inches puts more thread in the receiving member than a 1-1/2" or 2" screw can reach.
The recess accepts a #2 Phillips or a #2 square bit. A correctly sized square bit is designed to hold the screw on the tip for one-handed placement. Either bit will drive the screw; use whichever is already loaded in your driver.
No. The auger point is designed to self-start in wood without a pilot hole. The fluted tip cuts through wood fiber as the screw enters, reducing the force needed to drive in and lowering the risk of splitting near the edge of a panel.
In most wood-based materials, yes. The milling nibs under the flat head cut a countersink as the screw seats. On very hard surfaces, a light pre-countersink will improve the result, but in softwood, plywood, and most MDF the nibs handle it in one pass.
The black finish on this screw is rated for interior use. For outdoor work or contact with pressure-treated lumber, choose a screw with a corrosion-resistant coating rated for that environment.
When the joint is deep enough that a shorter screw leaves thread engagement on the table, the Würth #8 x 2-1/2" assembly screw gives you the reach, the clean-seating head, and the drive flexibility to keep production moving without an extra setup step.
Sold In: 1000 Each
