CS-2550

The CS-2550 is a monochrome copier sold under Kyocera's Copystar badge in the United States — the same machine Kyocera-badged offices know as the KM-2550. It runs on one black cartridge with two names: TK-421 is the family name and 370AR011 is the part number on the cartridge label. This page stocks that cartridge four ways — a single, a three pack, a standard five pack and a premium five pack — so the only real decision is how many your office wants on the shelf.

A shared monochrome copier in a busy work area goes through toner on a rhythm set by the whole department, not by one user. The CS-2550 usually anchors a copy corner or a small mail room, and its supply list could not be shorter: one cartridge, one color, no set of options to sort through when the warning light comes on. That simplicity is exactly why the multipacks exist — a department that changes toner every few weeks orders the five pack and stops thinking about it, while a quieter office can run cartridge to cartridge with singles and three packs.

Toner Cartridges for CS-2550

Cartridge	Color	Type	Page Yield
TK-421 (370AR011) Toner Cartridge Black	Black	Toner cartridge	See product page
TK-421 (370AR011) Toner Cartridges Black 3 Pack	Black	Toner cartridges, 3 pack	See product page
TK-421 (370AR011) Toner Cartridges Black 5 Pack	Black	Toner cartridges, 5 pack	See product page
TK-421 (370AR011) Premium Quality Toner Cartridges Black 5 Pack	Black	Toner cartridges, 5 pack	See product page

Which cartridge should you buy?

Fit is settled — every listing here is the same TK-421 cartridge — so choose by how fast your office burns through toner. A single cartridge suits a lightly used machine or a first order to confirm the cartridge in hand. The three pack covers a shared copier for a good stretch without tying up much shelf space. The five pack is the steady-state choice for departments that reorder on a cycle, and the premium five pack holds the same quantity in the premium-quality grade of the line. All four are compatible cartridges backed by a one-year warranty and one-year returns, so the grade and quantity are the only differences to weigh.

Chip, toner and everyday use

Changing the cartridge is a front-of-machine job: the copier recognizes the new unit once it is fully seated, so push it in firmly until it stops. Before installing, hold the cartridge level and rock it gently from side to side to distribute the toner evenly — this helps the first pages come out at full density. Keep unopened spares in a cool, dry cabinet rather than on top of the machine where heat builds up. When copies start to fade evenly across the page, that is the cartridge running low rather than a machine fault; a gentle shake can buy a few more days while the replacement ships.

Frequently Asked Questions

Are TK-421 and 370AR011 two different cartridges?

No, they are two names for one cartridge. TK-421 is the family name used across the Kyocera Mita line and 370AR011 is the part number; a cartridge under either name fits the CS-2550.

Is there a high-yield version of this cartridge on the page?

No separate high-yield code is listed for the CS-2550 here. The shelf holds one cartridge in three quantities — single, three pack and five pack — plus the premium-grade five pack, so capacity choices are made by pack size rather than by a different cartridge.

Will the cartridge from a KM-2550 fit my CS-2550?

Yes. The KM-2550 is the same copier under the Kyocera badge, and both machines take the TK-421. The badge on the front panel changes; the cartridge does not.

What does the premium five pack give me over the standard five pack?

Both packs contain five TK-421 cartridges for the same machine. The premium pack is the premium-quality grade of the cartridge line, while the standard pack is the regular grade — same fit, same count, different grade.