MICROLINE® 490 and 491

SKU: MICROLINE® 490 and 491 (Oki)

Reliable and fast with letter-quality output

Product Enquiry

  • Rated at 20,000 hours MTBF
  • Crisp, clear printing – on letterhead or 5-part forms
  • Rated at 20,000 hours MTBF
  • 3-year standard warranty
  • Print speeds up to 475 cps1
  • Integrated USB and IEEE Parallel connectivity standard
  • Optional OkiLAN® 6120i 10/100 Base-T Ethernet® internal print server
  • Crisp, clear printing – on letterhead or 5-part forms
  • Expandable head gap – accommodates multi-part forms and cut-sheet stock including labels and stiff index stock
  • 128 KB receive buffer/memory
  • 7.5 million-character ribbon life
  • 400-million character printhead life
  • Small footprint – ideal for retail countertops
  • Uses the same accessories as ML390/ 391 Turbo Series (except ribbons)


  • A forms printer with letter-quality output, designed to perform in demanding environments.
  • High-volume versatility in forms and correspondence.
  • Whether you need regular output of continuous multi-part forms, fine business correspondence—or combinations of both—24-pin OKI® ML490/491 printers are the single solution. They handle the printing needs of the most demanding environments—including point-of-sale, automation and utility applications such as wholesale or retail sales counters, financial departments, and manufacturing or ware-house sites. Yet they also produce letter-quality type and high-resolution graphics for the office and executive suite.
  • Unequaled performance technology.
  • The ML490/491 sport features that give them a strong edge over their predecessors as well as the competition:
    • An internal cooling fan provides continuous airflow for the printhead— maximizing throughput productivity for long, unattended print jobs
    • Additional feed rollers provide precise forms handling and printed-character placement accuracy
    • 3-piece top cover provides easy access and unsurpassed break resistance.
  • Fast, with finesse. ML490/491 printers run the gamut of paper types and envelopes at lightning speed—reaching 475 cps in Utility/Draft mode and 105 cps in Letter-quality. Their rugged printhead (200 million-character average life expectancy) is made up of powerful samarium magnets and stored-energy pins that deliver precise, sharp characters all the way through to the last page of a 5-part form.
  • The patented OKI closed-loop feedback system assures character placement accuracy. And a zero-tear feature accurately positions continuous forms for a clean tear at the perforation to eliminate wasted stock.
  • Sturdy and sophisticated.
  • Field-proven reliability is just one reason OKI MICROLINE printers are the most widely-used impact printers in North America.1 The rugged, reliable OKI ML490/491 printers are sure to win you over, too!
  • Built to last, inside and out.
  • The performance-optimized power supply of the OKI® MICROLINE® 490/491 has been enlarged to easily handle harsh printing conditions. Its energy management capabilities match power expenditures to print-job size, maximizing the life of the 24-pin printhead and other components. A long-lasting rack-and-pinion drive system ensures print quality longer than belt or cable systems.
  • And the ergonomically-designed, impact-resistant chassis protects the ML490/491 from damage, even in the toughest working environments.
  • All this performance is user-friendly.
  • Controls are conveniently placed on the front panel for fast access. The automatic loading of continuous and cut stock makes every print job easier, and the design of the internal sheet separator enables easy loading of tractor-fed paper into the rear push tractor.
  • OKI provides the edge in performance no competing printer can claim—and backs it with 3 years of warranty coverage 2 and a network of authorized OKI Dealer Service Centers and Service Depots.
  • The high-quality, highly reliable and highly affordable ML490/491 Impact printers from OKI. Put them to work in your office or behind the counter—and watch them drive your productivity to new limits while they improve the look of your forms printing.

Product Specifications

SKU* 62418901 62418903 62419001 62419003
Print Speed And Quality
Super Speed Draft (cps)** 475 475 475 475
High Speed Draft (cps) 420 420 420 420
Utility Speed (cps) 315 315 315 315
Near Letter Quality Speed (cps) N/A N/A N/A N/A
Letter Quality Speed (cps) 126 126 126 126
Number Of Colors 1 1 1 1
Maximum Graphics Resolution (dpi) 360 x 360 360 x 360 360 x 360 360 x 360
Fonts and Bar Codes
Resident Scalable Fonts Yes Yes Yes yes
Resident Bar Code Fonts Yes Yes Yes Yes
Paper Handling
No. Of Copies 5 5 5 5
Automatic Paper Forms Loading Yes Yes Yes Yes
Short Tear Off Yes Yes Yes Yes
Zero Tear Off Yes Yes Yes Yes
Rear Feed Yes Yes Yes Yes
Bottom Feed Optional Optional Optional Optional
Pin Feed Platen N/A N/A N/A N/A
Top Pull Tractors Optional Optional Optional Optional
Push Tractors Optional Optional Optional Optional
Paper Feed Rate (inch per second) 4.5 4.5 4.5 4.5
Cut Sheet Feeder Option Optional Optional Optional Optional
Roll Paper Stand Option Optional Optional Optional Optional
Parallel Interface Standard Standard Standard Standard
Serial Interface Optional Optional Optional Optional
Network-Ready Optional Standard Optional Standard
USB Standard Standard Standard Standard
Number of Pins 24 24 24 24
Autogapping Printhead No No No No
Expanded Head Gap Yes Yes Yes Yes
Printhead Life (characters) 400 million 400 million 400 million 400 million
Memory Buffer Size 128K 128K 128K 128K
Reliability/ MTBF (hours) 20,000 20,000 20,000 20,000
Monthly Workload (pages) 20,000 20,000 12,000 12,000
Operating / Physical Specifications
Noise Level In Operating Mode (dBA) 56 56 56 56
Ribbon Life (characters) 7.5 million 7.5 million 7.5 million 7.5 million
Power Voltage 120v or 220v 120v or 220v 120v or 220v 120v or 220v
EPA Energy Star Compliance Yes Yes Yes Yes
Dimensions Of Narrow Carriage w/out Box (W x D x H) (inches) 15.7 x 13.6 x 6.0 15.7 x 13.6 x 6.0 N/A N/A
Dimensions Of Wide Carriage w/out Box (W x D x H) (inches) N/A N/A 21.7 x 13.6 x 6.0 21.7 x 13.6 x 6.0
Weight Of Narrow Carriage w/out Box (lb.) 16.4 16.4 N/A N/A
Weight Of Wide Carriage w/out Box (lb.) N/A N/A 21.2 21.2
Additional Features
Front Panel Direct Access Controls Yes Yes Yes Yes
Front Panel Limited Function Mode Yes Yes Yes Yes
Warranty 3-year standard warranty parts and labor; 2-year printhead
Toll Free Telephone Support (hours/days) 24 / 7 24/7 24 / 7 24/7
Emulations Epson® LQ, IBM® ProPrinter®, IBM AGM, IBM XL24
OS Compatibility Windows® XP, 2000, 98/95, 3.x and NT® 4.0; MS-DOS®