Zebra GK420D (Ethernet) direct thermal printer

Code: Zebra GK420D Ethernet

The Zebra GK420D is no longer available. We instead suggest the TSC TE210.

Zebra GK420D

Direct thermal printer


The Zebra GK420D direct thermal printer offers the best value in a basic desktop printer, featuring a fast 5 inches per second print speed to meet your low- to medium-volume printing requirements. The GK420D has a sleek and compact design, boasts the smallest footprint in a 4-inch desktop printer, and supports a variety of applications and industries.

The GK420D comes standard with EPL and ZPL programming languages, and dual connectivity (USB, serial) for easy integration into existing systems. For additional flexibility, 10/100 internal Ethernet is also available. Well-suited to any industry, the reliable GK420D desktop printer is a smart investment that’s always a perfect fit.


Zebra GK420D direct thermal printer benefits

  • Best value in a desktop printer
  • Enhanced performance and speed
  • Built for ease-of-use and durability

Standard features

  • Print methods: direct thermal
  • Programming language: EPL and ZPL are standard construction: Dual-wall frame
  • Tool-less printhead and platen replacement
  • OpenACCESS™ for easy media loading
  • Quick and easy ribbon loading
  • Auto-calibration of media
  • Triple connectivity: USB, parallel, serial
  • Ethernet Connectivity

Print speed 

  • 127 mm per second

Print width

  • 104 mm

Print lenght

  • 991 mm


  • 203 dpi


  • Standard: 8 MB SDRAM (3 MB available to user); 4 MB Flash (1.5 MB available to user)
  • Optional: 64 MB Flash (68 MB total) Flash with RTC

Media sensors

  • Standard: Fixed reflective and transmissive sensors
  • Optional: Adjustable reflective black line sensor (GX models)

Media characteristics

  • Maximum Label and Liner Length: Maximum non-continuous: 39”/990 mm
  • Maximum Label and Liner Width: 0.75”/19 mm to 4.25”/108 mm
  • Maximum Media Roll Size 5”/127 mm O.D.
  • Media Thickness 0.003”/0.08 mm to 0.0075”/0.19 mm
  • Media Types Roll-fed or fan-fed, die-cut or continuous direct thermal labels with or without black lin

Networking and connectivity 

  • Ethernet—10/100 internal (optional) offered in combination with USB and serial interface (replaces parallel port)
  • Wireless—802.11 b/g or Bluetooth® (optional) with LCD display offered in combination with USB and serial interfaces 

Fonts and character sets

  • 16 resident expandable ZPL II bitmap fonts
  • One resident scaleable ZPL font
  • Five resident expandable EPL2 fonts
  • Native open type font support
  • Unicode™ compliant for multi-language, ondemand thermal printing

Barcode symbologies

  • Barcode Ratios: 2:1 (non-rotated) and 3:1
  • Linear Barcodes: Codabar, Code 11 (ZPL), Code 128, Code 39, Code 93, Code 93, EAN-13, EAN-8, EAN-14 (ZPL), German Post Code (EPL), Industrial 2-of-5 (ZPL), Interleaved 2-of-5, Japanese Postnet (EPL), ISBT-128 (ZPL), Logmars (ZPL), MSI, Plessey, Postnet, GS1 DataBar (RSS-14), Standard 2-of-5 (ZPL), UCC/EAN-128 (EPL), UPC and EAN 2 or 5 digit extensions (ZPL), UPC-A, UPC-A and UPC-E with EAN 2 or 5 digit extensions, UPC-E, and GS1 Databar (formerly RSS)
  • 2-Dimensional: Codablock (ZPL), Code 49 (ZPL), Data Matrix, MaxiCode, QR Code, PDF417, MicroPDF417, Aztec (For EPL and ZPL except where noted)

Physical characteristics

  • Width: 171mm
  • Depth: 209mm
  • Height: 152mm
  • Weight: 1.4kg (of printer only: no media or options)

Options and accesories

  • Dispenser—label peel and present with label present sensor
  • ZebraNet® 10/100 Print Server—Internal Ethernet for network communication and printing
  • Bluetooth wireless, includes LCD for visual communication—GX models only
  • 802.11b/g wireless radio, includes LCD for visual communication—GX models only
  • Adjustable media sensor for black line media— GX models only
  • Cutter for various media types—GX models only
  • 300 dpi print resolution printing for fine detail and crisp images (GX430t™)
  • 64 MB Flash memory with real-time clock (for total of 68 MB)—GX models only
  • Font Packs—Asian and other international font kits
  • KDU Plus™ and KDU™ keyboard display units for stand-alone printing solutions
  • Interface cables and adapters

Communication and interface capabilities

  • G-Series models triple interface standard
  • RS-232 auto-sensing serial interface, DB-9
  • USB V1.1, bi-directional
  • Centronics® parallel
  • Ethernet—10/100 internal (optional) offered in combination with USB and serial interface (replaces parallel port)
  • Wireless—802.11 b/g or Bluetooth (optional) with LCD display offered in combination with USB and serial interfaces (replaces parallel port)— GX models only

Please Note: specifications and options vary according to printer model and are subject to change without prior notice.


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