Würth #8 x 1-3/8" Flat Head Assembly Screw Combo Drive - Sharp Point Turbo Thread Lubricated, 3670000111961 1000 - 1000/Box

A 1-3/8 Inch Assembly Screw Sized for Standard 3/4-Inch Panel Joinery

The Würth #8 x 1-3/8 inch flat head assembly screw is a production-ready fastener built for cabinet boxes, drawer boxes, and panel joinery where 3/4-inch material is the standard stock thickness. Turbo thread, a sharp point, milling nibs, and a lubricated finish combine to deliver fast driving and clean head seating across engineered panels, softwoods, and hardwoods alike.

Key Features

• 1-3/8 inch length seats solidly through 3/4-inch panels with enough thread engagement to hold without over-penetrating.
• Turbo thread is engineered for reduced driving torque in particleboard, MDF, softwood, and hardwood cabinet materials.
• Sharp point self-starts quickly in panel materials without a pilot hole in most substrates.
• Flat head with milling nibs cuts its own countersink as the head seats, leaving a flush finish without a separate countersink step.
• Combo drive (#2 Phillips and #2 square) accepts either a Phillips or square bit in the same recess, so the crew uses whatever is already loaded.
• Lubricated finish lowers driving resistance during high-volume assembly runs, reducing bit wear and driver fatigue.

Where 1-3/8 Inches Does Its Best Work

The 1-3/8 inch length is a practical match for assembly joints in 3/4-inch sheet goods: cabinet carcass panels, drawer box sides, shelf standards, and similar interior joinery where a screw needs to pass through one face and bite firmly into the adjacent edge or panel. The extra thread engagement over a 1-1/4 inch screw makes a measurable difference in pull-out resistance in low-density substrates like particleboard and MDF without the risk of breakthrough on a standard 3/4-inch workpiece. It also handles 1/2-inch stock joined to a 3/4-inch back panel cleanly. Production cabinet shops running high volumes of carcass assembly will find this length covers the majority of their box-joining work in a single SKU.

Turbo Thread, Nibs, and Lubricated Finish

The turbo thread geometry reduces the torque required to seat the screw, which matters when driving hundreds of fasteners in a shift. The lubricated finish works alongside the thread design to cut friction further, extending bit life and reducing the heat buildup that accelerates stripping in high-production environments. The flat head carries milling nibs on its underside that relieve material as the head approaches flush, producing a clean, level countersink in particleboard, melamine, MDF, and solid wood without a separate countersink operation. That combination of thread, finish, and head geometry keeps the assembly line moving without sacrificing the clean appearance that finished cabinetry requires.

Who Reaches for This Screw

Cabinet shops assembling frameless or face-frame carcasses in volume are the primary buyers. The box of 1000 suits shops that measure screw consumption by the case rather than the jar. Millwork teams building drawer boxes and interior casework at the bench will use this length throughout the day. Installers who bring their own fasteners to the job site and need a reliable flat head that seats flush on the first pass without extra prep steps will also find the combo drive and lubricated finish worth keeping on the truck. The sharp point and turbo thread handle the full range of domestic cabinet materials, from soft pine to dense maple, without switching screws mid-project.

Frequently Asked Questions

The Right Screw for Every Carcass Joint on the Line

When the workday is built around 3/4-inch panel assembly, the Würth #8 x 1-3/8 inch flat head assembly screw handles the full range of those joints cleanly, quickly, and without added prep steps — one SKU covering the majority of what a production cabinet shop needs at the bench.