Order by 24/7 by web, contact our sales reps or call by phone.
What you need, when you need it, all in one place.
Most orders ship same day.
Advice and support from knowledgeable professionals.
The Würth #8 x 1-3/8" ASSY flat head assembly screw is engineered for wood-to-wood fastening in cabinet boxes, drawer components, and casework panels where a clean countersink and reliable seating in 3/4-inch material matter. The 1-3/8" length gives thread engagement through the full depth of standard 3/4-inch sheet goods while keeping the tip clear of opposite faces — a common fit problem in cabinet panel assembly. Packed 500 to the box with a compatible RW20 bit included.
Length selection in cabinet assembly is often more consequential than it looks. Too short and the screw lacks thread engagement; too long and the tip breaks through a finished face or panel back. At 1-3/8", this screw lands in the practical range for a #8 gauge fastener driven through or into 3/4-inch material. It works well for joining cabinet box sides to tops and bottoms, attaching nailers and stretchers, and securing interior partition panels — situations where a clean seating depth and a flush head are the priority. The flat head with milling nibs handles that flush seating by cutting a small countersink as the head drives home, which is particularly useful in melamine and MDF where pre-countersinking adds a step.
The RW20 is a Würth-proprietary drive system with a wider wing contact area and deeper recess than a standard star or Torx profile. That geometry means less bit wobble, better torque transfer, and longer bit life when you are running screws repeatedly through a production run. The included bit covers the box from the first screw. The zinc finish suits dry interior environments, which covers the vast majority of cabinet and casework assembly work. This screw is not intended for exterior applications or treated-lumber contact.
Cabinet shops assembling frameless or face-frame boxes in plywood, melamine particleboard, or MDF will find the 1-3/8" length a natural fit for panel-to-panel joints in 3/4-inch stock. Finish carpenters and installers doing site work on built-ins and casework reach for this size when driving into a single panel thickness or through thin stock into a cleat. The 500-piece box suits a shop working through a steady volume of carcass assemblies rather than occasional one-off fastening. The sharp point handles the softwood and engineered-panel substrates typical in that work, and the coarse thread pulls those materials together reliably without the stripping risk that a fine thread would bring in low-density panels.
Yes. Each 500-piece box includes a compatible RW20 drive bit so the box is ready to use without a separate purchase.
Yes. The sharp point starts cleanly in MDF, melamine-faced particleboard, and softwood plywood without pre-drilling in most applications. For very dense hardwood substrates, a pilot hole is advisable.
The milling nibs cut a small countersink as the head seats, allowing the screw to sit flush in wood and engineered panels without a separate countersink step in most materials.
This screw has a coarse thread, a sharp point, and a flat head — a combination suited to softwood and engineered panels, not hardwood face frames. For hardwood maple, oak, or cherry face-frame work, a fine-thread face-frame screw with a controlled point is the appropriate choice.
No. The zinc finish is suited to dry interior woodworking. For exterior or pressure-treated lumber applications, choose a screw with a corrosion-resistant coating rated for that exposure.
When the job is cabinet carcass assembly in 3/4-inch panels, the Würth #8 x 1-3/8" ASSY screw delivers the length, thread, and head geometry to keep the line moving — flush heads, clean countersinks, and an RW20 drive that stays engaged through 500 pieces.
Sold In: 500 Each
Quantity | Unit Price | Catalog | ||||
|---|---|---|---|---|---|---|
Sold in: 10 Each |  WW06147020 Mfr# 061470 20 961 10 | RW20 ASSY Insert Drive Bit |
