Würth #8 x 2-1/4" Flat Head Assembly Screw Square Drive - Type 17 Auger Point Coarse Thread Black, 3670000359961 2500 - 2500/Box

Wurth #8 Flat Head Assembly Screw For Wood Joints

Wurth #8 x 2-1/4" flat head assembly screw gives you a square drive, coarse thread fastener designed for wood assembly work where consistent bite matters. The square drive uses #2 square drive bits, which helps the bit stay engaged under torque during assembly. The screw uses a coarse thread, so it pulls wood parts together efficiently in typical woodworking substrates. The length is 2-1/4", giving added reach for thicker build-ups compared with shorter sizes in the series. The screw is case hardened, so the outer surface is hardened for drive strength while the core supports driving loads. A Type 17 auger point is specified, which is shaped to start into wood while clearing material at the tip. The screw is finished in black, providing a dark appearance where a black fastener head is preferred.

Key Details That Support Assembly Results

• The #8 screw size with coarse thread engages wood fibers firmly, helping joints draw tight in typical cabinet and woodworking assembly where pull strength is important.
• The 2-1/4" length gives extra depth compared with shorter options, which lets you fasten through thicker components or multiple layers in one pass.
• The flat head design allows the screw head to sit flush in a countersunk hole, keeping surfaces even when fastening face frames or structural components.
• The square drive uses #2 square drive bits, so the bit fits positively in the recess and helps reduce cam-out during powered driving.
• The Type 17 auger point is formed to cut into wood fibers at the tip, which supports smoother starts into many wood-based materials.
• The screw is case hardened, so the hardened outer shell supports the drive recess and shank while the core supports torque during installation.
• The black finish provides a dark head color, which helps the fastener blend visually in applications using darker surfaces.

Installation Behavior And Drive Interface Details

This Wurth #8 x 2-1/4" flat head assembly screw is driven with #2 square drive bits, so installers can work with a common bit size across this screw line. The coarse thread pattern is suited to wood-based materials, helping the screw advance quickly as it is driven. The Type 17 auger point shape works at the tip to remove wood as the point advances, which supports entry into many substrates. The case hardened construction reinforces the drive recess and shank surface during powered driving, which supports repeated installation tasks. The 2-1/4" length in a flat head format lets the head seat in a countersink while the shank spans thicker workpieces.

Using This Screw In Woodworking And Assembly Work

Where This Wurth Assembly Screw Is Typically Applied

This Wurth #8 x 2-1/4" flat head assembly screw with coarse thread is suited to woodworking and general assembly tasks where a wood-friendly thread is preferred. The coarse thread is designed to bite into wood fibers, making it appropriate for many cabinet, fixture, or furniture assemblies that use wood or wood-based panels. The 2-1/4" overall length allows fastening through thicker rails, cleats, or combined layers when shorter screws in the same family might not reach. The flat head geometry lets the head sit flush when a countersunk hole is prepared, which is useful when surfaces need to remain even for fitting adjacent parts.

Details That Support Consistent Driving And Joint Quality

The square drive recess on this screw works with #2 square drive bits, which creates a positive interface between bit and screw head and supports steady torque transfer during installation. This helps the coarse thread pull components together without frequent bit slippage. The Type 17 auger point is formed to start into wood and clear material at the tip, which supports cleaner entry as the screw advances into the substrate. Case hardened construction strengthens the screw surface and drive recess, which supports powered driving when working through dense or layered materials. The black finish offers a dark head color, which can be selected when a black fastener appearance is preferred on exposed or semi-exposed joints in woodworking projects.

Common Questions About This Wurth Assembly Screw

Select This Screw For Coarse-Thread Wood Assemblies

This Wurth #8 x 2-1/4" flat head assembly screw pairs a coarse thread with a Type 17 auger point and #2 square drive, giving woodworkers and installers a practical fastener for wood-based assemblies. The case hardened construction and 2-1/4" length support driven installation into thicker components while the flat head seats in a countersink for a flush finish. For cabinet shops, fixture builders, or serious DIY users needing a black, square-drive assembly screw for wood applications, this configuration offers a focused option for everyday fastening work.