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This Würth M4 x 39mm truss head machine screw is built for mounting cabinet knobs, pulls, and decorative hardware where the fastener needs to pass through thicker stock or a spacer before threading into the hardware fitting. The fine-thread M4 shank, Phillips/slotted combination drive, and wide truss head make it a practical choice for production shops and installers working with hardware that demands a longer reach.
Most cabinet hardware mounting calls for a 25mm or 30mm screw, but some jobs require more. When a pull or knob mounts through a thick solid-wood drawer front, a decorative escutcheon plate, a spacer block, or a built-up panel, the standard short machine screw falls short. The 39mm length closes that gap, giving the threaded shank enough engagement to seat the hardware firmly without needing a different fastener mid-install. It is the right length to keep in the drawer when the job involves anything thicker than standard 3/4-inch stock.
The truss head sits flat against the back face of the panel or mounting surface and spreads the load across a broad footprint, which helps the hardware seat evenly without pulling through. No countersink prep is needed. The Phillips/slotted combination drive means a #2 Phillips bit handles most installations, and a flat-blade driver works when that is all that is handy. Zinc plating keeps the screw presentable in visible interior locations and protects the steel in a dry, climate-controlled environment. These screws are for indoor cabinetry work.
Cabinet shops that stock a full range of hardware mounting screws keep the 39mm on hand for the jobs where shorter screws do not reach. Installers finishing kitchens and baths encounter thick drawer fronts and specialty hardware regularly enough that having the longer screw in the bag prevents a trip back to the supply house. Designers specifying hardware with integral backplates or escutcheons should call out this length to ensure the installer has what is needed before the job starts.
This screw uses a fine-thread M4 metric standard, which is common on European-specification cabinet hardware. If your knobs or pulls are specified for M4 threads, this screw is compatible. North American cabinet hardware typically uses 8-32 UNC threads, which is a different standard, so confirm the thread specification of your hardware before ordering.
The 39mm length is useful when the fastener must pass through thick stock, a spacer, or a built-up panel before reaching the hardware fitting. If your drawer front or door is thicker than standard 3/4-inch material, or if you are mounting hardware with an escutcheon or backplate, the extra length provides the thread engagement that shorter screws cannot.
No. The truss head is a non-countersunk profile designed to bear flat against the surface. It does not seat into a countersink and does not require one.
The zinc finish is suited to dry indoor environments. For exterior or high-humidity applications, a screw with a heavier corrosion-resistant coating would be the better choice.
The combination recess accepts a #2 Phillips driver or a standard flat-blade driver. Either works, though the Phillips recess is the better choice for powered driving.
Stocking the 39mm alongside shorter M4 machine screws means the right fastener is already in the box when a thick drawer front or built-up panel enters the shop, keeping the install moving without a detour for a longer screw.
Sold In: 100 Each
Quantity | Unit Price | Catalog | ||||
|---|---|---|---|---|---|---|
Sold in: 100 Each |  WW48450 Mfr# 0231011430961 100 | Würth M4-30mm Truss Head Machine Screw Phillips/Slotted Drive - Blunt Point Fine Thread Zinc, 0231011430961 100 - 100/Box | ||||
Sold in: 100 Each |  WW48400 Mfr# 0231011425961 100 | Würth M4-25mm Truss Head Machine Screw Phillips/Slotted Drive - Blunt Point Fine Thread Zinc, 0231011425961 100 - 100/Box |