Labels & Ribbons for the Zebra GK420

The Zebra GK420 takes labels 19mm to 108mm wide in rolls up to 127mm across, and (on the GK420t) 74m ribbons up to 109mm wide. Here's exactly what fits, and what to buy.

First, which GK420 do you have?

Model How it prints Ribbon
GK420d Direct thermal None needed
GK420t Thermal transfer 74m only

The GK420 has been replaced by the Zebra ZD421, which takes the same 4-inch labels and also 300m ribbons. Your GK420 supplies below are still widely available.

Labels that fit the GK420

Specification GK420
Label width 19mm to 108mm (maximum print width 104mm)
Label length Up to 990mm
Core size 12.7mm, 25mm or 38mm
Maximum roll diameter 127mm
Label thickness 0.08mm to 0.19mm

For shipping labels, 4 x 6 inches (102 x 152mm) on a 25mm core fits both models:

Ribbons for the GK420t

Specification GK420t
Ribbon length 74m only
Ribbon width 33.8mm to 109mm
Ribbon core 12.7mm
Grade Best for Example
Wax Paper labels: shipping, product and shelf labels Zebra 2300 wax, 110mm x 74m
Wax-resin Coated paper and some synthetics, more rub resistance Zebra 3200 wax-resin, 84mm x 74m
Resin Polyester and polypropylene labels facing heat, chemicals or abrasion Zebra 5095 resin, 84mm x 74m
300m ribbons don't fit the GK420t. If you're changing ribbons often, the ZD421t takes 300m ribbons.

Common questions

Will my GK420 labels fit a new ZD421? Yes. The ZD421 takes the same 4-inch label sizes and cores, so you can keep using your existing labels and 74m ribbons.

Can I use 4x6 labels on a GK420? Yes, on a 25mm core. Use direct thermal labels on the GK420d.

Can you supply other label sizes? Yes. Our Genie labels are made in our own UK factory. Tell us the size and material you need and we'll quote.

Not sure? We'll match it for you

Send us your printer model and label size, or a photo of your current label roll, and we'll confirm the right labels and ribbon.

Request a sampleAsk us

Specifications from Zebra's GK420 technical specifications.