Desktop thermal printers · Media requirements
Zebra GK420d labels
The GK420d user guide identifies direct thermal printing at 203 dpi. Use heat-sensitive stock and review its roll, continuous and fanfold loading instructions. A complete numeric media-width envelope has not been established from this reviewed guide; no exact label SKU is confirmed here.
Last Verified: · Market: See source scope
What to check before buying
- A ZD421 specification must not be reused for this model.
Search aliases: GK420d, GK 420d, Zebra GK420d. Always match the identifier printed on the device; an alias is a search aid, not a substitute model.
Product lifecycle and support
In North America, Zebra discontinued GK420d sales on January 31, 2022, and service and support on April 30, 2025. Zebra retains the product resources but says they will no longer be updated. These dates concern product support; they do not change the documented media requirements of an existing printer. Other regions have different dates; check the linked manufacturer notice.
Documented media specifications
| Requirement | Documented value | Qualification | Evidence |
|---|---|---|---|
| Printing technology | Direct thermal | Introduction. Select heat-sensitive media for direct thermal printing; thermal transfer mode requires ribbon. | Source reference |
| Print resolution | 203 dpi | Introduction. | Source reference |
| Roll core range | 12.7–38.1 mm | Media Types table; check holders, optional accessories and the rest of the feed requirements. | Source reference |
Specific media products
No exact SKU relationships are confirmed in this edition. Use the documented specification requirements above and obtain full media specifications from the supplier. This is an evidence gap, not a declaration of incompatibility.
Sources and verification
- GK420d Desktop Printer Support — regional discontinuation datesZebra Technologies · manufacturer product · Retrieved · North America
Lifecycle notice reviewed on September 22, 2026. North American sales ended January 31, 2022; service and support ended April 30, 2025. This is lifecycle evidence, not a new media-compatibility verification.
- User Guide — Zebra GK420d Desktop Printer (P1129574-01EN)Zebra Technologies · manufacturer manual · Retrieved
Manufacturer source retrieved again and relevant specifications reviewed on 2026-09-06. Original retrieval date is preserved.
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