K20
A direct replacement for the Zünd Z20 (3910313), Esko BLD-SF420 / i-420 (G42421974), Gerber MCT SE20 (895020), Colex T00420, and Summa L25 (500-9811), with no holder modification needed. Single edge oscillating blade for through cutting on Zünd, Esko, Gerber / MCT, Colex, and Summa flatbed cutting systems.
Sold individually.
Direct OEM replacement
The K20 matches the Zünd Z20 (3910313), Esko BLD-SF420 / i-420 (G42421974), Gerber MCT SE20 (895020), Colex T00420, and Summa L25 (500-9811) on form, fit, and geometry. Same blade body, same mounting, same cut profile. No holder modifications needed before you load it.
What is oscillating through cutting?
Through cutting means the blade passes completely through all layers of the material, including any backing or liner. The cut piece separates fully from the sheet.
The K20 does this with an oscillating action: the blade moves up and down at high speed while it cuts rather than dragging through the material. On corrugated board, honeycomb, sandwich board, and similar materials, this matters. A drag blade deflects or stalls in dense or layered stock. The oscillating stroke keeps the cut path clean and the edge consistent through the full depth.
Fine grain tungsten carbide
The K20 is made from fine grain tungsten carbide. On production work, corrugated board especially, carbide holds a sharp edge through far more cuts per shift than standard steel. You get cleaner cut edges for longer before drag sets in and cut quality starts to fall off.
Common questions
How do I know this fits my machine?
If your machine uses any of these part numbers, the K20 is a direct fit: Zünd Z20 / 3910313, Esko BLD-SF420 / i-420 / G42421974, Gerber MCT SE20 / 895020, Colex T00420, or Summa L25 500-9811. If you are not sure, contact us before you order. We would rather confirm the fit than send you the wrong blade.
What materials does it cut?
The K20 is rated for corrugated board, foamboard, folding carton, felt, leather, display board, foam rubber, carpet, sandwich board, honeycomb, sandblasting mask, varnish blankets, and 3M VHB tape. For thin films, vinyl, or label stock where you only need to cut through the face material and leave the liner intact, a drag blade is a better fit for that application. Not sure which blade your job calls for? Contact us.
What do the 63° and 84° angles mean?
The K20 features a 63° cutting angle and an 84° wedge angle. These are two separate properties of the same blade, not two blade options. The 63° cutting angle determines how the edge engages the material on each oscillating stroke. The 84° wedge angle is the geometry of the blade body itself, which gives the edge the durability to hold up through production cycles on dense and layered materials.
How do I know when to replace it?
Watch for the cut to start dragging across the surface rather than driving cleanly through. On corrugated board and foam, a worn blade often crushes and compresses the material at the cut edge before it actually cuts through. Torn edges, incomplete cuts, or material sticking rather than releasing are all signs it is time for a fresh blade.
Getting the most from your cutting table
A fresh blade is a good start. But if you are going through blades faster than expected, or cut quality has become inconsistent, the blade is rarely the whole story. Cut depth, speed, pressure, and machine condition all affect how long a blade lasts and how clean it cuts.
It is worth asking: When was your machine last serviced? Are your parameters dialed in for this material? Is this the right blade geometry for what you are cutting? Could your operators use time with someone who runs these machines every day?
Flatbed Tools offers machine service, preventive maintenance, operator training, and workflow consulting. If something is not cutting right, reach out. We have probably seen it before.