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Black ribbon cartridge in a rectangular plastic housing

Oki Data

Oki Data 42377801 printer ribbon black 7.5 million character ML420 421 490 491

SKU CH-V2XA-XW116 MPN 42377801

Black matrix nylon ribbon with re-inker yields 7.5 million characters for Microline 420, 421, 490 and 491 printers

  • Ribbon SeriesML400 Series
  • CompatibilityML420 / 421, ML490 / ML491 printers
  • Type SpecificationsRibbon Cartridge - Black - 7.5 million character life - ML42
  • TypeRibbon
  • ColorBlack
  • Selling UnitEACH
  • High-yield ribbon prints 7.5 million characters before replacement
  • Matrix nylon with re-inker keeps output consistent across long runs
  • Fits ML420, ML421, ML490 and ML491 dot-matrix printers
  • Single black cartridge installs without assembly
  • Manufactured in Japan to Oki Data specifications

Ribbon cartridge for ML420 and ML490 series

This Oki Data ribbon cartridge, model 42377801, is a black matrix nylon ribbon with an integrated re-inker. It is designed for dot-matrix printers in the Microline 420 and 490 families. The sealed cartridge installs without assembly and is sold as a single unit.

Compatibility and yield

The cartridge fits Microline 420, 421, 490 and 491 printers and delivers a rated yield of 7.5 million characters. Buyers who need a ribbon for a different printer series or a higher-capacity cartridge should look at other supplies.

Rated character life

The decisive specification is the 7.5 million character rating, which determines how long the ribbon lasts before replacement. Verify that your printer model appears in the compatibility list before ordering.

Highlights

  • High-yield ribbon prints 7.5 million characters before replacement
  • Matrix nylon with re-inker keeps output consistent across long runs
  • Fits ML420, ML421, ML490 and ML491 dot-matrix printers
  • Single black cartridge installs without assembly
  • Manufactured in Japan to Oki Data specifications

Specifications

BrandOki Data
Model42377801
Ribbon SeriesML400 Series
CompatibilityML420 / 421, ML490 / ML491 printers
Type SpecificationsRibbon Cartridge - Black - 7.5 million character life - ML420 / 421, ML490 / ML491 printers
TypeRibbon
ColorBlack
Selling UnitEACH
Quantity1
Shipping weight0.04 kg
Package size84 × 71 × 25 mm

Questions about this item

How do I install the 42377801 ribbon cartridge in my ML420 printer, and what step is often missed?

Open the printer cover, remove the old cartridge, insert the new ribbon cartridge until it clicks into place, then manually turn the ribbon-tension knob clockwise to remove slack before closing the cover.

When will the 42377801 ribbon need replacement, and is any maintenance required before then?

The ribbon is rated for 7.5 million characters; no maintenance is required — simply replace the cartridge when print quality fades or the character count is reached.

What limit appears first during continuous high-volume printing with the 42377801 ribbon?

The 7.5 million character yield is the first limit; once reached, the ribbon is exhausted and must be replaced.

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