Ultra-reliable – Highly durable 9-pin print head, long ribbon life

Renowned for durable design, OKI’s reliable dot matrix printers deliver fast, efficient results. The ML320 Elite features a highly-durable 9-pin print head and has a confirmed high mean time between failures (MTBF) of 5,000 hours.

  • Unique, high-durability 9-pin print head
  • Reliable performance, 5,000 hours MTBF
  • Ribbon life of 3 million characters (re-inking cartridge)

Easy-to-use – Ideal for labels, listings and point-of-service applications

The versatile ML320 Elite is ideal for a range of customer-facing and office documents, including labels, listings and other point-of-service applications.

  • Ideal for labels, listings and point of service applications
  • Narrow 80-column carriage width
  • Choice of typefaces and fonts including NLQ-Courier, NLQ-Sans Serif, High Speed Draft, Utility

Fast throughput – Up to 360 characters per second print speed

Ideal for applications where speed is more important than letter quality and with a compact design ideal for the desktop, the ML320 Elite efficiently delivers high-speed, high-volume output.

  • Up to 360 characters per second print speed
  • Compact design (116mm height x 398mm width x 345mm length)

Multi-part forms – Efficiently prints up to 5 copies on demand

Quickly and efficiently producing multi-part continuous forms and other fast throughput, the ML320 Elite prints up to 5 copies on demand.

  • Multi-part forms handling (original + 4 copies)
  • Narrow carriage width: 80 columns (10cpi), 160 columns (compressed mode)


Printing Technology Serial Impact Dot Matrix Method
Print Head 9 Pin
Dot Wire Diameter 0.34 mm
Print Direction Bidirectional/Unidirectional printing, Short line-seeking printing
Graphic Resolution Max. 240(H) x 216(V) dpi
Print Speed Super Speed Draft : 360 cps, High Speed Draft : 300 cps, Utility : 250 cps, Near Letter Quality : 63 cps
Line Feed Pitch 4.23mm (1/6 “), 3.18mm (1/8 “), n x 0.35mm(n/72 “) (n=1-85), n x 0.18mm(n/144 “) (n=0-255), n x 0.12mm(n/216 “) (n=0-255)
Feed Speed 4.5 inches per second
Feed Rate 4.23mm(1/6”) line feed: Approx. 70 milliseconds
Paper Route Manual (Top), Tractor feeder (Rear), Tractor feeder (Bottom), Cut sheet feeder (Rear), Roll paper stand
Character Pitch Super Speed Draft : 12.0 cpi
High Speed Draft : 10.0 cpi, 12.0 cpi, 15.0 cpi, 17.1 cpi, 20.0 cpi
Utility : 10.0 cpi, 12.0 cpi, 15.0 cpi, 17.1 cpi, 20.0 cpi, Propotional
Near Letter Quality : 10.0 cpi, 12.0 cpi, 15.0 cpi, 17.1 cpi, 20.0 cpi, Propotional
Printing Width 80 characters/line at ANK 10 cpi
Interface Centronics Parallel, (Optional) RS-232C (25pin), (Optional) RS-422
Emulation ESC/P emulation, IBM ProPrinter emulation, IBM Graphics Printer emulation
Receive Buffer Max. 27KB
Resident Font High Speed Draft, Utility, NLQ Courier, NLQ Gothic
Font Style Bold, Double Width, Double Height, Emphasized, Italics, Over score, Underline
Paper Type Continuous paper, Continuous copying paper, Cut sheet, Card, Envelope, Label
Paper Weight Adjustment Manual
Paper Weight Continuous paper : 45 – 90 gsm
Single part paper : 45 – 90 gsm
Multi part paper : 34 – 41 gsm
Copy Capability Normal print mode: original + 3sheets(Total Thickness < 0.36mm)
Dimensions(WxDxH) 398 x 345 x 116 mm
Operating Environment Operating: 5 – 40 °C, 20 – 90 %RH
Storage: -40 – 70 °C, 5 – 95 %RH
No condensation
Power Source Single phase 230 – 240 VAC ±10%, 50/60 Hz ±2%
Power Consumption Operating: Max. 145W (ISO10561 (Utility, Range1) Printing Approx. 75W)
Idle: Approx. 25W
Safety & Environment Regulation EMC-Directive, CE Mark
Noise Level Operating :Approx. 57 dBA
Idle: < 0 dBA
Power Save: < 0 dBA or Background level
Quiet Mode: < 52 dBA
MTBF(Mean Time Before Failure) 5,000 hours
Ribbon Life Black : 3 million characters
Print Head Life *1 Approx. 300 million strokes/ pin
In the Box Ribbon cartridge, Power cable, CD-ROM, Others


*1 Average in 10cpi utility mode at 25%duty and 35% page density