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This Würth #8 x 3-inch flat head assembly screw is built for wood joints where extra depth is needed to reach the material below. A coarse thread, Type 17 Auger point, flat head with nibs, and #2 Phillips drive make it a dependable choice for cabinet carcass assembly, wood panel joinery, and structural woodworking in thicker lumber and panel stacks.
A 3-inch length is the right call when standard shorter screws cannot reach deep enough to anchor the joint. Cabinet back panels laminated to thick substrates, doubled-up plywood carcass walls, and furniture frames built from 2x stock all create joint depths that shorter assembly screws cannot bridge. This screw drives through the near face and threads fully into the second member, giving the joint a long thread engagement zone that shorter lengths cannot provide. For cabinet shops working with thick panel goods or structural woodworking that combines multiple layers, keeping a box of 3-inch assembly screws on hand covers the jobs where nothing shorter will do.
The black finish on this screw is well suited to interior woodworking where a dark fastener blends with stained or painted cabinet interiors. Hardened steel construction gives the screw the torsional strength to drive through dense panel stacks without twisting the shank. The flat head profile with underhead nibs countersinks cleanly in wood-based panel materials, leaving the head flush at the surface without additional prep work. The coarse thread is optimized for fibrous wood substrates, including softwood solid lumber, plywood, MDF, and particleboard, where fine threads would offer less pull-out resistance.
Cabinet shops assembling deep carcass boxes, furniture makers working with built-up panel sections, and finish carpenters joining thick structural members will find the 3-inch length covers situations that come up regularly in production. It is well suited to indoor, dry environments. The 2000-piece box supports production volume without frequent restocking, making it practical for shops that move through assembly screws at pace. This is an interior fastener, best reserved for protected woodworking applications where exposure to moisture is not a factor.
Three inches gives you the thread depth to fasten through thick panel stacks, doubled carcass walls, or 2x lumber where a 1-1/2 or 2-inch screw would not reach far enough into the receiving member to hold reliably.
The auger-style flute at the tip cuts and ejects wood fibers as the screw enters, which reduces the torque needed to drive through dense or layered stock and lowers the risk of splitting along the grain.
No. The nibs mill their own countersink as the head seats, so the flat head sits flush without a separate countersink operation in most wood-based panel materials.
This is an interior screw. The black finish is not rated for exterior exposure or use with ACQ-treated lumber. For outdoor work, choose a screw with a corrosion-resistant coating rated for exterior conditions.
It accepts a standard #2 Phillips bit, which is the most commonly stocked driver bit in shops and on job sites.
When the joint is deep and a shorter screw will not bridge it, this Würth #8 x 3-inch assembly screw provides the thread engagement, point geometry, and head design to drive cleanly, seat flush, and hold in thick-stock interior woodworking.
Sold In: 2000 Each
Quantity | Unit Price | Catalog | ||||
|---|---|---|---|---|---|---|
Sold in: 10 Each |  WW614176461 Mfr# 0614176461005 10 | #2 x 1" Phillips Drive Insert Bit (10/Bag) |