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The Würth ASSY Flat Head Screw Kit gives cabinet shops, installers, and woodworking professionals a hands-on way to evaluate ASSY G4 flat head screws before stocking them in volume. The kit includes a curated selection of ASSY flat head screws, RW20 drive bits, and a bit holder, so everything needed to run a test drive is in one package.
ASSY screws are built for cabinet assembly, casework, face frames, drawer boxes, and hardwood or softwood panel fastening. The flat head profile seats flush when driven into a countersink, making it well suited for finished interior surfaces where a proud head is not acceptable. This sample kit is specifically useful when you want to confirm that ASSY screw sizes, thread behavior, and countersink results work as expected in your shop's materials before placing a production order. It is also a practical way to introduce the RW drive system to a crew that has not used it before, since the included bits and holder remove the need to source tooling separately.
The RW20 drive is a Würth-proprietary system, not a standard star or Torx recess. Its deeper socket and wider wing contact area are engineered to work specifically with ASSY screws, delivering better torque transfer and longer bit life than a generic hexalobular bit in the same application. One RW20 bit covers the ASSY screw diameter range in this kit. The ASSY thread design reduces the friction and driving resistance that can slow production in dense hardwoods or slow the start in engineered panels like MDF and melamine-faced particleboard. Together, the drive and thread are intended to function as a system rather than as interchangeable commodity parts, which is why the kit pairs them.
Cabinet shops evaluating a new screw system, project managers specifying fasteners for a casework run, and finish carpenters adding a flush-head wood screw to their kit will all find this a low-friction way to assess the ASSY G4 line. It is also a sensible choice for installers who work across a range of wood species and panel products and need to confirm screw behavior in each before committing to a large quantity. Because the bits and holder are included, it doubles as a starter kit for crews new to the RW drive system.
The RW20 is a Würth-proprietary drive designed specifically for ASSY screws. It has a deeper recess and larger contact surfaces than a generic hexalobular or star drive, which improves torque transfer and reduces cam-out. Standard star or Torx bits are not the correct tool for this recess.
ASSY flat head screws are suited for hardwoods, softwoods, and engineered panel products including MDF, particleboard, and melamine-faced panels. The thread geometry is engineered to reduce driving force across that range of materials.
Yes. The kit includes ASSY G4 flat head screws in multiple sizes, RW20 drive bits, and a bit holder. No separate bit purchase is needed to test the system.
No. ASSY screws require the RW drive bit. The RW recess is not interchangeable with standard star or Torx bits, and using the wrong bit risks cam-out and head damage. The correct bits are included in this kit.
The kit is positioned as a sample and evaluation package. Once you have confirmed the right ASSY sizes and thread behavior for your application, production quantities are available separately.
The ASSY G4 Flat Head Screw Kit with RW bits and holder gives you a complete, ready-to-use introduction to the Würth ASSY system, so you can make a confident stocking decision based on real results in your shop.
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