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The Würth #8 x 2-1/2 inch flat head assembly screw is a coarse-thread wood screw built for cabinet box construction, case assembly, and other joinery where reach matters. The 2-1/2 inch length handles material stacks that shorter screws cannot bridge, and the square drive, Type 17 auger point, and milling nibs work together to seat the head cleanly in a single pass.
Cabinet box assembly sometimes calls for a fastener that pushes past a face layer and still gets meaningful thread engagement in the panel behind it. At 2-1/2 inches, this screw covers situations like fastening a nailer through a finished panel, pinning a back into stacked material, or driving through a thick substrate into a secondary member. It also suits shelving units, furniture carcase construction, and millwork frames where shorter screws would leave thread engagement too shallow to hold under load. For shops running cabinet production, this length fills the gap between the 2 inch general-purpose screw and the 3 inch structural screw.
The Type 17 auger point carries a longitudinal flute that clears chips as the screw advances, cutting rather than wedging its way into the material. That matters most in dense softwood, edge-glued panels, and the faces of plywood where fiber resistance is highest. The milling nibs on the underside of the flat head do their job at the end of the drive stroke, reaming the countersink clean so the head seats flush without tearing the surface. The #2 square drive completes the picture: the tapered socket geometry is designed to keep the screw seated on a correctly sized bit during placement, which helps when both hands are managing a panel and a driver at once.
A 2500-count pail is sized for operations that go through assembly screws in volume. Cabinet shops running box production, millwork crews assembling large runs of casework, and installers setting multiple cabinet banks in a single day will all burn through a smaller package quickly. Pail packaging is convenient for movement around the shop or to the job site. The zinc finish and coarse thread make this screw a straightforward choice for the dry indoor work that makes up the bulk of cabinet and casework production.
The extra half inch provides deeper thread engagement when you are fastening through a thick substrate, stacked panels, or a face layer into a secondary member. In applications where a 2 inch screw would leave less than an inch of thread in the receiving material, stepping up to 2-1/2 inches gives you more holding power.
Yes. The coarse thread and Type 17 auger point are both well suited to the fiber structures of plywood, MDF, and particleboard. These are the materials that make up most cabinet box and casework panels, so the screw is designed with those substrates in mind.
Not typically. The milling nibs on the underside of the head are designed to cut their own countersink as the screw seats, so in most wood and engineered panel applications you can drive to flush without a separate countersink step. Very dense hardwood may benefit from a pilot hole.
No. The zinc finish provides standard indoor corrosion resistance. For outdoor work or contact with pressure-treated lumber, use a screw with a corrosion-resistance coating rated for those conditions.
It uses a #2 square drive bit. Using a correctly sized bit is important for the square drive to hold the screw during placement.
When your assembly line does not stop, your fastener supply should not either. The 2500-count pail of this #8 x 2-1/2 inch square drive assembly screw keeps the box full through long production runs, reducing the trips to the bin that slow a busy shop down.
Sold In: 2500 Each
Quantity | Unit Price | Catalog | ||||
|---|---|---|---|---|---|---|
Sold in: 1 Each |  WW90210 Mfr# 0614176153961 1 | #2 x 1" Square Drive Insert Bit, 2 Piece Bit | ||||
Sold in: 1 Each |  WW90220 Mfr# 0614176139961 1 | #2 x 2" Square Drive Insert Bit, 2 Piece Bit | ||||
Sold in: 1 Each |  WW90230 Mfr# 0614176140961 1 | #2 x 3" Square Drive Insert Bit, 2 Piece Bit | ||||
Sold in: 1 Each |  WW90240 Mfr# 0614176142961 1 | #2 x 4" Square Drive Insert Bit, 2 Piece Bit | ||||
Sold in: 1 Each |  WW90260 Mfr# 0614176143961 1 | #2 x 6" Square Drive Insert Bit, 2 Piece Bit |