GK420 GT800
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If you need fast 4-inch thermal printers that are easy to use, easy to deploy and easy to manage, then choose the ZD420. Building on the legacy of the industry-leading GK Series printers, the ZD420 Series printers deliver features and functionality that take deployment and management simplicity, ease-of-use, application flexibility and total cost of ownership (TCO) to a new level. Faster, higher-quality printing that keeps your business moving.

And when ease of use, flexibility and management simplicity matter, the ZD420 ribbon cartridge printer is the easiest thermal transfer printer to load, period – so users can replace the ribbon and get back to work in seconds.

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  • Thermal Transfer print method
  • ZPL and EPL programming languages
  • 5 status icon, 3 button user interface
  • USB 2.0, USB Host
  • OpenACCESS™ for easy media loading
  • Dual-wall frame construction
  • ENERGY STAR qualified


  • Dimensions: 10.5 in. L x 8.0 in. W x 7.5 in. H 267 mm L x 202 mm W x 192 mm H Weight 5.3 lb./2.4 kg PRINTER SPECIFICATIONS
    Operating System Link-OS®
  • Resolution: 203 dpi/8 dots per mm Optional 300 dpi/12 dots per mm Resolution can be factory installed or changed on site via accessory kits. Resolution can be changed from 300 dpi to 203 dpi, as well as from 203 dpi to 300 dpi
  • Memory: 512 MB Flash; 256 MB SDRAM for factory Installed network connectivity options 256 MB Flash; 128 MB SDRAM for printers without factory installed network connectivity options
  • Maximum Print Width: 4.09 in./104 mm for 203 dpi 4.27 in./108 mm for 300 dpi
  • Maximum Print Speed: 6 in./152 mm per second (203 dpi) 4 in./102 mm per second (300 dpi)
  • Media Sensors: Full width, moveable reflective/black mark sensor; multi-position transmissive/ gap sensor
  • Firmware ZPL II; EPL 2; XML; ZBI


  • Maximum Label Length: 39.0 in./991 mm
  • Media Width: 0.585 in./15 mm to 4.65 in./118 mm
  • Media Roll Size: Maximum outer diameter: 5.00 in./127 mm Core inner diameter: 0.5 in. (12.7 mm) and 1.0 in. (25.4 mm) standard, 1.5 in. (38.1), 2.0 in., (50.8 mm) and 3.0 in. (76.2 mm) using optional adapters
  • Media Thickness: 0.003 in. (0.08 mm) min.; 0.0075 in. (0.1905 mm) max.
  • Media Types: Roll-fed or fan-fold, die cut or continuous with or without black mark, tag stock, continuous receipt paper, and wristbands
  • Ribbon Outside Diameter: 2.6 in./66 mm (300 m); 1.34 in./34 mm (74 m)
  • Ribbon Standard Length: 984 ft. (300 m); 244 ft. (74 m)
  • Ribbon Ratio: 1:4 media to ribbon (300 m); 1:1 media to ribbon (74 m)
  • Ribbon Width: 1.33 in./33.8 mm ― 4.3 in./109.2 mm
  • Ribbon Core I.D.: 300 meter ribbon 1 in./25.4 mm; 74 meter ribbon 0.5 in./12.7 mm


  • Operating Temp. : 40° to 105° F/4.4° to 41° C
  • Storage Temp. : -40° to 140° F/-40° to 60° C
  • Operating Humidity: 10% to 90% non-condensing
  • Storage Humidity: 5% to 95% non-condensing
  • Electrical: Auto-detectable (PFC Compliant) 100-240VAC, 50-60Hz; ENERGY STAR qualified


  • Media Handling: Field installable dispenser – label peel and present with label present sensor; field installable cutter
  • Communications: Field installable RS-232 auto-sensing Serial, DB-9; Ethernet – 10/100 internal; factory installed wireless dual radio: 802.11ac Wi-Fi and Bluetooth 4.1; Bluetooth Low Energy included as standard on network connected models
  • Real Time Clock: Real time clock included as standard on network connected models
  • Keyboard Display Unit: ZKDU keyboard display units for stand-alone printing solutions
  • Mounting Plate: Optional accessory to secure ZD Series printers to countertops or shelves.


  • Bar Code Ratios: 2:1 and 3:1
  • 1D Bar Codes: Code 11, Code 39, Code 93, Code 128, ISBT128, UPC-A, UPC-E, EAN-8, EAN-13, UPC and EAN 2-or 5-digit extensions, Plessey, Postnet, Standard 2-of-5, Industrial 2-of-5, Interleaved 2-of-5, Logmars, MSI, Codabar and Planet Code
  • 2D Bar Codes: Codablock, PDF417, Code 49, DataMatrix, MaxiCode, QR Code, MicroPDF, Aztec
  • Fonts and Graphics: 16 resident expandable ZPL II bitmap fonts Two resident scalable ZPL fonts Five resident expandable EPL2 fonts Native open-type font support Unicode compliant for multi-language, on demand thermal printing China units include SimSun simplified Chinese font 64 MB user available non-volatile memory, 8 MB user available SDRAM


For industry-leading quality, service and thermal printing expertise, choose Zebra Certified Supplies to ensure consistent, optimized performance for your Zebra printer.


  •  IEC 60950-1, EN55022 Class B, EN55024, EN61000-3-2, EN610003-3, FCC Class B, ICES-003, FCC 15.209; 15.247(d), IC RSS 247, EN 300 328, EN 301 893, EN 62311, cTUVus
  •  CE Marking, VCCI, C-Tick, S-Mark, CCC, CU, BSMI, KCC, SABS, INMetro, BIS, NOM

The ZD420 is ideal in:

Light Manufacturing

  • Agency labels/ nameplates
  • Product labels
  • Apparel tags
  • Work-in-Process (WIP)
  • Inventory labels
  • Agency labels
  • Shipping labels

Transportation & Logistics

  • Asset labels
  • Shipping labels
  • Receiving labels
  • Packing slips


  • Prescriptions
  • Lab and specimen labels
  • Patient ID wristbands
  • Asset labels
  • Blood and IV bag labels
  • Patient record labels


  • Return tags
  • Asset labels
  • Shelf labels
  • Price markdowns
  • Information labels


  • Asset labels
  • Record labels


  • Service reminder labels
  • Ticketing
  • Purchase transactions