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K390-550 drag blade replaces Summa 390-550

K390-550

$32.00 - $32.00
$32.00
$32.00 - $32.00
$32.00

A direct replacement for the Summa 390-550, with no holder modification needed. Single edge drag blade for kiss cutting on Summa, Zund, Gerber / MCT, Esko, and Cutworx Apex flatbed cutting systems.

Sold individually.

Cut Method
Kiss Cut
Cut Angle
35° / 40°
Made Of
Fine Grain Tungsten Carbide
Blade Specifications
Knife Type
Drag
Edge Configuration
Single Edge
Stock Form
Round Stock
Max Cutting Depth
0.039in / 1.0mm
Start Overcut
None
End Overcut
0.057in / 1.45mm
Compatibility
Machine Brand
Cutworx, Cutworx Apex, Esko, Gerber/MCT, Summa, Zund
Compatible Materials
3M VHB (Very High Bond Tape), Magnetic Foil, Polycarbonate, Polyester, Pre-Mask, Self Adhesive Vinyl, Transfer Paper, Windows Perf
OEM Cross References
Summa 390-550

Direct OEM replacement

The K390-550 is a direct drop-in for the Summa 390-550. Same form, same fit, same geometry. No holder modification is required. If Summa 390-550 is the part number on your current blade, this replaces it.

What is kiss cutting?

Kiss cutting means the blade cuts through the face material — the vinyl, film, or label stock — without cutting through the liner underneath. The finished piece peels cleanly from the sheet. This blade is built specifically for kiss cut work. It is not a through-cut blade.

Fine grain tungsten carbide

The K390-550 is ground from fine grain tungsten carbide. On a flatbed table running production volume, carbide holds an edge far longer than steel. You get more cuts per shift, more consistent cut quality across a run, and less time stopping to swap blades.

Common questions

How do I know this fits my machine?

This blade replaces the Summa 390-550. If that is the part number on your current blade, this is the direct replacement. Not sure? Contact us before you order.

What materials does it cut?

This blade is rated for self adhesive vinyl, polycarbonate, polyester, masking film, window prep vinyl, magnetic media, transfer paper, and 3M VHB. Cutting something not on this list? Reach out and we can tell you whether a different blade geometry is a better fit.

What do the two cutting angles mean?

[TEAM CONFIRM REQUIRED — See Team Question #1. Spec table shows 35° / 40°. Zoho shows 60°. Once angles are confirmed and labeled, complete this answer using the dual-angle template: The [X]° cutting angle helps the blade track smoothly through the material, while the [Y]° wedge angle provides the balance of sharpness and edge durability for production kiss cut work.]

How do I know when to replace it?

Watch cut quality, not run time. If the blade is dragging or tearing through the face material, or the cut piece is not releasing cleanly from the liner, it is time to swap. A dull blade will also tend to leave a rough or lifted edge on detail work.

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.