
Original Epson Ink Cartridge
Epson T966 XXL Black Ink Cartridge (WorkForce Pro WF-M52xx / WF-M57xx)
The WF-M5299 and WF-M5799 are Epson’s monochrome business inkjets — built to replace a mono laser in a busy workgroup. Heat-Free Technology means no fuser and no warm-up, so power draw is a fraction of a laser’s and the first page is out almost immediately.
This is the XXL black cartridge, rated at 40,000 pages. It is the lowest cost per page in the range by a wide margin, and holds enough for months of ordinary workgroup printing.
Quick Glance
Key Features
Heat-Free, low power
No fuser to heat means no warm-up wait and markedly lower energy use than a comparable mono laser, with fewer moving parts and less to go wrong over the life of the machine.
Pigment ink, sharp text
Epson’s pigment black dries on the surface of the paper, so documents come out smudge-proof, water resistant and crisp enough for small type and fine rule lines.
Three yield tiers
The same ink is sold at 5,000, 10,000 and 40,000 pages. The jump to XXL is the big one — see the Need-to-Know table below for yields and part numbers.
Detailed Specifications
- Epson WorkForce Pro WF-M5299DW
- Epson WorkForce Pro WF-M5799DWF
Both models above take every tier in this range. These are mono-only machines, so there is one cartridge to stock rather than four. They do not share ink with the newer WF-M5399DW or WF-M5899DWF, which take T12D, T12E and T12F packs instead.
Page yields are Epson’s own approximate figures, measured to ISO/IEC 19752. Actual yield varies with what you print and how the machine is used — Epson publishes the detail at epson.eu/pageyield.
These WorkForce Pro models also consume a maintenance box (C13T671600), which collects waste ink and is shared across the WF-C5xxx, WF-M52xx and WF-M57xx ranges. We can supply it — ask us to add one to your ink order.
Specifications are provided by the manufacturer and may be updated or changed without prior notice. AtomOffice is not responsible for any discrepancies between the information shown here and the manufacturer's official documentation.
Need-to-Know
The same black ink is sold in three yield tiers. Higher tiers cost less per page and need changing less often; the part number changes with the tier, so order against the right code.
| Colour | L (T964) | XL (T965) | XXL (T966) — this page |
|---|---|---|---|
| Black | C13T964140 (5,000 pages) | C13T965140 (10,000 pages) | C13T966140 (40,000 pages) |
The step from XL to XXL is four times the yield, so for any workgroup printing steadily it is usually the one worth costing out. All three tiers fit both printers, and you can move between them at any time.
Frequently Asked Questions
Check the label on the cartridge currently in the printer, or the consumables list in your WorkForce Pro manual, and match it against the T966 XXL part number, C13T966140. If you would rather have us confirm it, send us your WF-M model number and our UAE team will check for you.
The T966 cartridge fits the Epson WorkForce Pro WF-M5299DW and WF-M5799DWF. It does not fit the newer WF-M5399DW or WF-M5899DWF, which take T12D, T12E and T12F instead.
It is the same black ink — only the amount in the cartridge changes. L gives 5,000 pages, XL 10,000 pages and XXL 40,000 pages. Higher tiers cost less per page and interrupt printing less often. This page is the XXL tier; we also stock the L (T964) and XL (T965).
Heat-Free Technology is the short answer: there is no fuser to bring up to temperature, so the machine uses considerably less electricity, starts printing almost immediately, and has fewer consumable parts — no drum, no toner waste bottle, just a cartridge and a maintenance box. Send us your monthly volume and we can work through the running cost with you.
Yes — this is 100% original Epson ink, sourced through official Epson channels. Epson inks are developed to work with Epson printers to deliver crisp, smudge-proof output, and these are not compatible or refilled alternatives.
Need ink for your Epson WorkForce Pro mono printer?
Send us your WF-M model number and monthly print volume, and our UAE team will confirm the right yield tier, quote it, and add a maintenance box if you are due one.

