Oki MICROLINE 321 Turbo 9-pin Dot Matrix Impact Printer
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OKI MICROLINE 321 Turbo Serial Impact Dot Matrix Printer

Product Details

Tank Tough® reliability and expanded head gap for dedicated forms printing


The MICROLINE® 320/321 Turbo builds on the heritage of Tank-Tough® reliability established by OKI's ML320/321, our best-selling dot matrix printer all around the world.


This 9-pin dot matrix printer is blazing new trails in productivity. Engineered for dedicated printing in the most demanding point-of-sale, automation and utility applications, the ML320/321 Turbo can easily run twice as long as most printers in its class! It can simplify any job on virtually any stock, and it's economical enough to put wherever you need data on the spot.


The ML320/321 Turbo puts the "work" in workstations for financial departments, wholesale or retail sales counters, even for warehouse or manufacturing environments.


Set it up with a box of forms — even 6-part invoices! — and let it run and run and run.


Its relentless performance comes from the rugged printhead design that keeps your print images sharp for a 200-million character life. A lighter, stronger, more efficient motor reduces friction, heat build-up and wear. The long-lasting rack and pinion drive system ensures print quality longer than belt or cable systems. Plus, an impact-resistant chassis protects the entire mechanism, even in the harshest environments.


When it comes to endurance, dependability and efficiency, the ML320/321 Turbo sets a new standard.


Unmatched paper-handling capability

Specifically designed to offer enhanced paper-handling capabilities, the ML320/321 Turbo can be set with an expanded gap between printhead and platen, accommodating multi-part forms and stock that are up to twice as thick as those that fit our nearest competitor. A bottom feed feature* keeps the paper path short and straight when running stiff card stock or labels.


The ML320/321 Turbo printhead has a lightweight samarium cobalt magnet and powerful, spring-activated pins to deliver a stronger punch — right to the last page of a 6-part form!


For precisely formed output, a patented optical sensor accurately positions the printhead on the page, first time and every time. And the auto-tear feature accurately positions continuous forms for a clean tear at the perforation — eliminating wasted forms.


This reliable, flexible 9-pin dot matrix printer can meet your needs today and in the future, because it's the perfect replacement for the ML320/321. It's exactly the same size, built to stand up to harsh factory conditions, and is compatible with virtually all custom and "off-the-shelf" software.


The ML320/321 Turbo. A lot of tank-tough performance for dedicated forms printing.


* Requires optional push tractor


Print Speed And Quality
Super Speed Draft (cps)435   
High Speed Draft (cps)390   
Utility Speed (cps)300   
Near Letter Quality Speed (cps)75   
Letter Quality Speed (cps)N/A   
Number Of Colors1   
Maximum Graphics Resolution (dpi)240 x 216   
Fonts and Bar Codes
Resident Scalable FontsYes   
Resident Bar Code FontsYes (8 Types)   
Paper Handling
No. Of  Copies6   
Automatic Paper Forms LoadingYes   
Short Tear OffYes   
Zero Tear OffYes   
Rear FeedYes   
Bottom Feedw/Pull or Bott. Trac.   
Pin Feed PlatenN/A   
Top Pull TractorsOptional   
Push TractorsRear / (Opt. Bott.)   
Paper Feed Rate (inch per second)5   
Cut Sheet Feeder OptionN/A   
Roll Paper Stand Optionno   
Parallel InterfaceStandard   
Serial InterfaceOptional   
Number of Pins9   
Autogapping PrintheadN/A   
Expanded Head GapYes   
Printhead Life (characters)200 million   
Memory Buffer Size128K   
Reliability/MTBF (hours)10,000   
Monthly Workload (pages)13,000   
Operating / Physical Specifications
Noise Level In Operating Mode (dBA)57   
Noise Level In Quiet Mode (dBA)55   
Ribbon Life (characters)3 million   
Power Voltage120v or 220v   
EPA Energy Star ComplianceYes   
Dimensions Of Narrow Carriage w/out Box (W x D x H) (inches)N/A   
Dimensions Of Wide Carriage w/out Box (W x D x H) (inches)21.7 x 13.6 x 4.6   
Weight Of Narrow Carriage w/out Box (lb.)N/A   
Weight Of Wide Carriage w/out Box (lb.)20.9   
Additional Features
Front Panel Direct Access ControlsYes   
Front Panel Limited Function ModeYes   
Warranty1-year parts, labor and printhead   
Toll Free Telephone Support (hours/days)24 / 7   
EmulationsEpson FX, IBM PPR III and OKI MICROLINE   
OS CompatibilityWindows® XP, 2000, 98/95, 3.x and NT® 4.0; MS-DOS®; Novell® – NDS®, NDPS, NLSP; IPX/SPX protocol; UNIX; HP® JetAdmin®, Web JetAdmin® compatible   


Product Comparison


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Product Brochure

General Information

Microline 321 Turbo is a point-of-sale impact printer with automation and utility applications, IEEE parallel connection. Tank-Tough reliability, expanded head gap and zero-tear capability are designed for dedicated forms printing. This nine-pin, dot matrix printer blazes new trails in productivity with the richness of features. It handles paper stock twice as thick as similar standard printers and eliminates wasted forms. Relentless performance comes from the rugged printhead design that keeps your print images sharp for a 200-million character life. A lighter, stronger, more efficient motor reduces friction, heat buildup and wear. The long-lasting, rack-and-pinion drive system ensures print quality longer than belt or cable systems. Printer generates 435 black/white characters per second with 240 x 216 dpi.

Technical Information
Print Color Capability:Monochrome
Maximum Mono Print Speed (cps):435
Maximum Print Resolution:288 x 144 dpi
Number of Pins:9-pin

Standard Memory:128 KB

Parallel Port:Yes

Media Types & Handling
Media Type:Label
Media Type:Envelope
Media Type:Cut Sheet
Media Type:Card Stock
Media Type:Continuous Form
Media Type:Multiple Part Form

Fonts & Emulation
Language Emulation:Epson FX
Language Emulation:IBM ProPrinter III
Language Emulation:Oki Microline

Operating System Supported:Windows® 8, Windows 7, Vista® 32/64, XP, 2000

MTBF:10000 Hour
Duty Cycle:13000

Power Description
Power Source:AC Supply
Input Voltage:120 V AC
Maximum Power Consumption:100 W

Physical Characteristics
Form Factor:Desktop
Weight (Approximate):20.94 lb

Additional Information:
  • Receive Buffer: 28K
  • Number of Copies: 6
  • Front Panel Limited Function Mode
  • Front Panel Direct Access Controls

Code Pages:

  • Standard ASCII
  • Epson Character Set I and II
  • IBM Character Set I, I and All
  • Code Page 850, 860, 863, 865, 437

Paper Handling:

  • Thickness:
  • Rear Feed: 0.014" (0.36 mm) maximum
  • Bottom Feed: 0.017" (0.43 mm)maximum expandable to 0.031" *

Software Drivers:

  • HP JetAdmin
  • Web JetAdmin
  • OkiVIEW 32

*Requires Optional Push or Pull Tractor

Platform Supported:PC
Recycled Content:0%
Assembly Required:No
Energy Star:Yes
Environmentally Friendly:Yes
Environmental Certification:ENERGY STAR
Country of Origin:Thailand

Limited Warranty:1 Year

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Shipping Restrictions
  • This item cannot be shipped to PO Boxes.
  • This item can be shipped only within the U.S.

  • UPC: 051851450087 
  • Mfr's Part #: 62411701