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The Würth #8 x 2-1/4 inch flat head assembly screw is a coarse-thread wood fastener with a Type 17 Auger point, underhead nibs, and a #2 square drive. It is designed for production woodworking and cabinet assembly where screws need to reach through thicker substrates and seat flush in a single pass.
Most cabinet assembly screws top out at 1-1/4 or 1-1/2 inches, which is enough for single-layer panel work. The 2-1/4 inch length is the right tool when the job involves something thicker: face frames attached through 3/4-inch box sides into 3/4-inch rails, double-layered carcass panels, blocking built up from two plies, or hardware backing strips that need a fastener to reach well past the face material. It is also a practical choice when joining 3/4-inch stock to solid-wood components thicker than nominal one-inch material. The extra length delivers thread engagement deep enough to hold under load without relying on the near-side material alone.
The flat head profile with underhead nibs is built for flush installation. As the screw is driven, the nibs mill the countersink seat into the surrounding wood, so the head finishes at or below the surface without a separate countersink operation in most cases. The Type 17 Auger point clears chips ahead of the thread, which matters in hardwoods and denser sheet goods where a plain sharp point would require noticeably more force and risk splitting the grain. The coarse thread provides solid withdrawal resistance in solid wood and structural-grade plywood. The black finish suits dark or finished cabinet interiors where a zinc or bright head would stand out. This is an indoor fastener — not rated for exterior or treated-lumber applications.
Cabinet shops running production lines keep this length on hand for the joining steps that come up once the main carcass is built: attaching face frames to boxes with thick stock, adding nail rails or utility blocking, and fastening backs on built-up panels. Custom woodworkers use it where solid-wood components are thick enough that a 1-5/8 or 2 inch screw would leave too little thread in the second member. The 2500-count pail suits any shop that burns through hardware across a full day of assembly. Pail packaging is convenient for movement around the shop or to the job site.
When you are fastening through a thick face frame into a solid-wood stile, or through double-layer carcass material, the extra quarter inch of thread engagement makes a real difference in holding power. A 2 inch screw in that situation may leave only a few threads biting into the second member.
In most solid woods and structural plywood, yes — the nibs mill their own seat as the screw is driven. In very hard species like hard maple or hickory, a shallow countersink pilot speeds things up and produces a cleaner entry, especially at production volume.
The #2 square drive fits any standard #2 Robertson bit. The screw is designed to seat on a correctly sized bit for placement control — a worn or off-spec bit will reduce that grip, so using a fresh, properly sized bit gives you the best results.
No. The black finish on this screw is suited for dry indoor environments. For exterior work or pressure-treated lumber, a corrosion-rated coating is required.
The Auger variant has a longer, more aggressive flute that clears chips more efficiently through the full depth of the cut. This is especially useful in thicker stock, where the screw travels a longer path before the thread fully engages.
When the joint requires real depth — thick stock, layered panels, or a face frame that needs to stay put — the Würth #8 x 2-1/4 inch assembly screw gives you the thread engagement to back up the connection, paired with a drive and point geometry that keeps installation fast and clean at production volume.
Sold In: 2500 Each
Quantity | Unit Price | Catalog | ||||
|---|---|---|---|---|---|---|
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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 | ||||
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