Würth #8 x 2-1/4" Flat Head Assembly Screw Square Drive - Type 17 Auger Point Coarse Thread Black, 3670000095961 3500 - 3500/Box

Wurth #8 x 2-1/4 Flat Head Assembly Screw

Wurth #8 x 2-1/4 Flat Head Assembly Screw describes a case hardened fastener built for assembly work where a consistent bite and drive control matter. The #8 size and 2-1/4 inch length give you a familiar, versatile format when pulling typical woodworking components together in one pass. The flat head configuration lets the screw sit flush once driven, which helps when you need panels, cleats, or framing parts to meet cleanly without proud fastener heads. The black finish provides a dark, uniform appearance at the head, which is useful when you want fasteners to visually recede on darker materials or hardware details. Because this is an assembly screw, it is suited to jobs where you are fastening components as part of a repeatable build process rather than one-off temporary connections.

Key Assembly Screw Details That Drive Results

• The screw uses a #2 square drive bit, so the recess matches a common driver size, which helps maintain positive engagement at the bit and reduces the tendency for the driver to slip under load.
• The thread form is coarse thread, which means the screw advances with fewer turns into typical assembly materials, saving drive time while still generating holding power over the threaded section.
• The point style is a Type 17 auger point, which is designed to start into material efficiently, helping the screw begin cutting its path quickly so you can advance into the workpiece without excessive pre-start effort.
• The screw is case hardened, so the outer surface has been hardened, enhancing resistance to head damage and drive recess wear while the screw is being driven during assembly.
• The 3/4 inch and 1 inch lengths in this product line are threaded fully, which means their threads run the full length of the shank, giving shorter fasteners continuous engagement along their entire length in the material.
• All other sizes in this line are threaded two-thirds from the bottom of the screw, so the unthreaded portion near the head can help draw pieces together as the threaded lower section bites into the receiving material.

Threading, Drive, And Point Features In Use

The coarse thread on this Wurth assembly screw advances more material per turn, which translates into quicker run-down when you are driving multiples across a cabinet, fixture, or frame. The #2 square drive interface uses a square recess that fits a matching bit closely, which helps the bit stay centered under torque and supports more controlled driving in tighter or awkward positions. The Type 17 auger point cuts its own entry path as it is driven, so the tip begins to remove material at the start of insertion and helps the screw establish a track into the work with less initial resistance. With the shank threading pattern running fully on 3/4 inch and 1 inch lengths and two-thirds from the bottom on other lengths in the line, the screw behavior shifts from full-length grip on short fasteners to a combination of pull-together and bite on longer versions, supporting different assembly approaches.

Assembly Screw Details Applied To Real Work

Where This Wurth Assembly Screw Fits Best

This Wurth #8 x 2-1/4 flat head assembly screw operates within a product family where threading style and point design stay consistent, so workflow habits carry across sizes. In that line, the coarse thread layout means that each length, including this 2-1/4 inch version, engages quickly into typical assembly materials while you are building out runs of components. The full threading on 3/4 inch and 1 inch sizes supports shorter fasteners that grip along their entire length, which is useful where material thickness is limited and you want every millimeter of penetration contributing to holding power. For longer screws in the same line, the two-thirds-from-bottom threading pattern changes how the fastener behaves as it cinches parts together, allowing the non-threaded upper shank to move through the first piece while the lower threads take hold.

Why These Features Support Repeatable Assembly Results

The coarse thread design means each revolution of the driver moves the screw forward more aggressively, so on repetitive assembly tasks you spend fewer seconds at each fastener location while still developing clamping force through the threaded zone. The #2 square drive bit interface keeps the driver bit seated firmly in the recess, which supports steadier torque transfer when you are driving the screw in series during production-style work. With the Type 17 auger point doing the initial cutting at the tip, the screw begins to enter the material with less hesitation, helping maintain a consistent driving cadence across multiple joints. Case hardening adds a tougher outer shell to the screw, which helps the head and drive recess better tolerate the torsional loads from power drivers as you cycle through jobs. The combination of threading schemes across lengths in the line and the flat head profile supports assemblies where you want flush seating and predictable pull-together behavior on a wide range of part thicknesses.

Common Questions On Wurth Assembly Screw Details

Selecting This Screw For Assembly Workflows

This Wurth #8 x 2-1/4 flat head assembly screw combines a coarse thread, Type 17 auger point, case hardened construction, and #2 square drive in a single fastener, so your assembly process benefits from quick entry, firm driver engagement, and flush seating. The way threading is arranged across the lengths in the line gives you options between full-length grip on shorter screws and pull-together behavior on longer sizes, supporting different joint designs while keeping drive feel consistent. For repetitive assembly runs where speed and control are priorities, this screw configuration is suited to building a reliable, repeatable fastening routine.