Zebra GK420T / GC420t ribbon — size, core and grade
The Zebra GK420T / GC420t takes 110mm × 74m ribbon on a ½" core, outside wound (ink side out).
Codewell Image manufactures that ribbon in Badli, New Delhi — wax, wax-resin and resin grades, slit to your label width, with a free sample before you order.
About the GK420T
The GK420t is the desktop Zebra with the largest installed base in India, and the model most often found in small retail and clinic settings. It takes only 74m ribbon on a half-inch core, so it burns through rolls quickly — buyers frequently try to fit a 300m industrial roll and find the spindle will not accept it. If ribbon changes are eating your day, the honest answer is usually a different printer rather than a different ribbon. The GC420t takes the same 74m ribbon on a ½-inch core, and can only use ribbon coated on the outside.
Zebra GK420T / GC420t specifications for ribbon
| Print method | Thermal transfer (uses ribbon) |
|---|---|
| Resolutions | GC420t: 203 dpi |
| Print width | GC420t: 104mm |
| Ribbon width range | GK420t: 33.8–109.2mm; GC420t: 33.8–110mm |
| Maximum ribbon length | 74m |
| Core | ½" |
| Winding | Outside (ink out) |
Ribbon specification
110mm × 74m is the standard size for this model. Because we slit in-house you are not restricted to it: you can order a narrower width that is still a few millimetres wider than your label, so less ribbon overhangs and goes to waste.
Which grade for a GK420T
The printer does not decide the grade — the label material and the conditions it has to survive do.
Paper labels — shipping, retail, inventory (Zebra GK420t, ZD420)
Pharma and compliance labels on coated paper (Zebra ZT230, ZT410)
Synthetic labels — polyester, polypropylene (Zebra ZT420, ZT610)
Nylon and satin garment labels (Zebra GX430t)
Unsure? The ribbon selector narrows it in two questions, or see the full size chart listing the printer models we have checked.
Loading ribbon in a Zebra printer
Core sizes: ½ inch and 1 inch. Winding: Zebra desktops (GK, GX, GC) take outside-wound ribbon only. For the ZD series, Zebra's guides do not state the ink side, so we confirm the winding against your roll before dispatch. The ZT230, ZT231 and 105SL Plus are outside only; the ZT410, ZT420, ZT610 and ZT620 take outside wound as standard, and inside wound only with Zebra's optional spindle. Specify your model when ordering for confirmed compatibility.
Zebra GK420T / GC420t ribbon — common questions
What ribbon size does the Zebra GK420T / GC420t use?+
110mm × 74m on a ½" core, outside wound (ink side out). At 74m a roll covers roughly 740 labels at 100mm pitch. We slit 25mm – 160mm, so a non-standard width for your label is not a problem.
Is the GK420T inside or outside wound?+
Outside wound — the ink side faces out. Load an inside-wound roll instead and the ink faces away from the label, so the label comes out blank; that reads as a printer fault but is a winding problem.
Which ribbon grade should I use in a GK420T?+
Grade follows the label, not the printer. Desktop units like the GK420T are most often paired with paper stock, where wax (CW-11 or CW-12) is the right grade. Move to wax-resin only if the label is coated or synthetic.
Can I get a free sample for my GK420T?+
Yes. We manufacture in Badli, New Delhi and send samples so you can print on your own GK420T with your own label stock before ordering volume. Wash-care and resin grades in particular are worth testing rather than taking on spec.
Need a size the GK420T does not take as standard? We slit 25mm – 160mm.
Ask for a custom size