Monroe Systems for Business

Monroe P51S Ribbon Cartridges (Black, Red)

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  • Front view of Monroe P51S Super Saturated Black/Red Ribbon Cartridges
  • Side view of Monroe P51S Super Saturated Black/Red Ribbon Cartridges



Monroe P51S Super Saturated Black/Red Printing Calculator Ribbon Cartridges

Introducing the Monroe P51S Super Saturated Black/Red Printing Calculator Ribbon Cartridges - the epitome of high-quality calculator supplies. These easy-to-install ribbon cartridges are designed specifically for Monroe calculators but are also compatible with various other brands and models.

Monroe, a name synonymous with the highest standards in the calculator industry, takes pride in producing the darkest printing black/red ribbon cartridges on the market. The Monroe P51S Ribbon Cartridges are a testament to this commitment. Engineered with the highest possible inking degree, these cartridges ensure a smudge-free experience, offering you the cleanest and most precise prints.

The Monroe P51S Ribbon Cartridges are not just about quality prints; they are also about convenience. Monroe's engineers have developed the most user-friendly calculator ribbon to install. They have created the first-ever cartridge containing a calculator ribbon, which provides you with the easiest installation process.

To maintain the darkest print on their paper tape, users of Monroe products are suggested to change their P51S ribbon cartridges after replacing 3 paper tape rolls. This ensures that your calculator always delivers the best printing results.


What is a printer ribbon cartridge? A printer ribbon cartridge is a component of a printer that contains a long strip of fabric saturated with ink. The ink is transferred to the paper during the printing process. The Monroe P51S Ribbon Cartridges are an example of high-quality printer ribbon cartridges designed for calculators.

Those who know, choose Monroe.

For use in the following Monroe printing calculators:
  • Monroe Classic
  • Monroe Pro
  • Monroe Ultimate**
  • Monroe 8130**
  • Monroe 8145**
  • Monroe 7130
  • Monroe 7140
  • Monroe 7150*
  • Monroe 5130
  • Monroe 5140

*Older Monroe 7150 purchased prior to 2006, use Monroe P65M Black/Red Universal Ribbon Spools

**Monroe X Series printing calculator models (Monroe UltimateX, Monroe 8130X, and Monroe 8145X are not compatible with the Monroe P51S ribbon cartridge. Click here to find the ribbon cartridge that corresponds with each Monroe calculator model. The Monroe P51S also replaces the Monroe P51M and GRC E205BR ribbons.

How do I remove and replace the P51S ribbon cartridge for the Monroe Ultimate Printing Calculator?

Still have questions on how to remove and replace the P51S in your Monroe printing calculator?

Contact the Monroe team at (267) 580-2600. We're here to help!


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Additional Information

For Use With:
Monroe Classic, Monroe Pro, Monroe Ultimate, Monroe 8130, Monroe 8145, Monroe 7130, Monroe 7140, Monroe 7150 (after 2006), Monroe 5130, Monroe 5140
Not For Use in:
Any current "X" series calculator
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8 Reviews

  • 5

    Posted by Stephanie Rivera on Apr 15, 2024

    The shipment was fast and I have always used Monroe products. Have always had great products

  • 5
    All is...

    Posted by Nelson Rutherford on Dec 14, 2023

    All is good

  • 5
    Always the best!

    Posted by Jennifer McCalla on Dec 14, 2022

    These Monroe P51S ribbons are our go-to item. Always dependable, easy to order, fast shipping!

  • 5
    Satisfied User

    Posted by Monroe Customer on Jul 11, 2022

    I'm very happy with the Ribbon Cartridge(s) I received. These do not appear to be old and dried up like the ones received from the store we normally buy from. The first ribbon was nearly unusable. Dry when I used it and the second one was worse than the first. Waste of money and time. Will continue to use Monroe going forward. Ordering online was fast and easy and received promptly. Great Job!

  • 5
    Monroe Products

    Posted by Darryl Johnson on Jun 20, 2022

    I've used Monroe calculators exclusively at work since 1978 and personally I own two. They are simply the BEST, as are the ribbons.

  • 5

    Posted by Monroe Customer on Mar 29, 2022

    I have been through a lot of ribbon that was so faded I had to think I was replacing used ribbon with used ribbon. Finally a ribbon that is dark and lasts a long while.

  • 5
    Calculator ribbon

    Posted by Monroe Customer on Feb 09, 2022

    Excellent product, great price and fast shipping!

  • 5
    Monroe P51S

    Posted by Cindy Fulkerson on May 09, 2021

    Good quality replacement ribbon.

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