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Black nylon printer ribbon cartridge for Oki ML621 and 691 dot matrix printers

Oki Data

Oki Data 44173404 printer ribbon ML621/691 13M chars

SKU CH-BCYT-3S4J9 MPN 44173404

Nylon ribbon for Oki ML621 and 691 dot-matrix printers yields up to 13 million characters

  • Type detailsThermal Transfer
  • Compatible withML621 / 691
  • Product typeRibbon
  • Sold asEACH
  • Pack quantity1
  • Delivers up to 13 million characters per ribbon
  • Compatible with Oki ML621 and ML691 printers
  • Nylon fabric construction for reliable dot-matrix output
  • Green compliant with zero recycled content
  • Ready to install with no assembly required

Direct replacement for ML621 and 691 printers

This nylon ribbon is built specifically for the Oki ML621 and 691 dot-matrix printers. It installs without tools and delivers up to 13 million characters in utility mode. The cartridge ships new and ready for immediate use in compatible machines.

Drop-in cartridge that keeps legacy output running

The ribbon slots straight into the printer’s existing carriage with no assembly required. It frees the operator from frequent ribbon changes during high-volume runs such as invoices, shipping labels or multi-part forms. Green-compliant construction meets environmental standards without recycled content.

Upgrades worn or dried-out ribbons on the same

When print quality fades or the advance mechanism slips, this cartridge restores crisp output on the installed ML621 or 691. The jump is worth it whenever the current ribbon falls short of the rated 13 million-character yield. It does not add colour, speed or connectivity beyond the printer’s native design.

How it compares

Measured against everything we stock in Ribbon Cartridges for Printers, at today’s prices. Recalculated every night.

Price $33.99
Pricier than about 71% of the 1,004 comparable items (median $17.99).

Specifications

Product
Brand nameOki Data
Model name44173404
Product typeRibbon
Size & build
Shipping weight0.21 kg
Package size476 × 97 × 33 mm
Compatibility
Compatible withML621 / 691
In the box
Pack quantity1
More details
Type detailsThermal Transfer

Questions about this item

How many characters can the ribbon print before it needs replacing?

The ribbon yields up to 13 million characters in utility mode before replacement is required.

Does the ribbon generate noticeable heat or noise during continuous dot-matrix printing?

The ribbon itself is a passive nylon cartridge; heat and noise come from the printer mechanism, not the ribbon.

Which OKI MICROLINE printers must I already own for this ribbon to fit?

The ribbon is compatible only with the ML621 and ML691 models.

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