SKU:

CS-HP-11A--Black

Printer Brand:

Hewlett Packard

OEM Number:

Q6511A Q6511X

Ink Color:

Black

Page Yield:

Black: 6000

Printer Type:

Laser Cartridge

Condition:

New Compatible

Frequently Asked Questions

Why does this listing carry two cartridge codes?

Because this supply is listed under both of its identities: Q6511A and Q6511X — the HP 11A cartridge, sold here as a single unit at $45.41. If the cartridge you are removing is stamped with either of those codes, this is the listing that corresponds to it. The dual naming is there so the cartridge can be found by whichever code your machine's old unit happens to carry.

Which code should I match against my printer?

Whichever one is printed on your existing cartridge. Read the stamp before ordering — some units in this family are marked Q6511A, others Q6511X — and either stamp leads you to this same cartridge. Matching the code on the physical unit in your hand is always the reliable route, rather than going by the printer's paperwork alone.

Which printers does this cartridge serve?

The 2400-series LaserJets — machines such as the LaserJet 2400 and the 2420 and 2430 models in the same family. These are long-serving departmental workhorses, and this cartridge is their standard black supply: it installs in the same slot, in the same way, as the unit it replaces.

How will I know when the cartridge is running low?

The printer's toner gauge gives the first estimate, and the print itself gives the verdict: pages that fade evenly from top to bottom are a cartridge nearing its end. Rocking the unit gently side to side redistributes the remaining powder and restores density for a final stretch of printing while the replacement is arranged.

Does fitting this cartridge involve anything else?

No. The imaging drum is built into the cartridge on this platform, so the swap renews the whole print path in one motion — pull the old unit, slide this one in, close the cover. There is no separate drum to order and no settings to change afterwards.

What warranty and returns cover applies?

A 1-year warranty and 1-year free returns, with the full terms on our shipping and returns page. We deliver from warehouses in Illinois, Pennsylvania, Georgia and California, and support is staffed Monday through Friday, 9 AM to 5 PM CST if you want a hand confirming the code before you order.

About This HP 11A Cartridge

This compatible cartridge for the 2400-series platform is listed under its two working identities, Q6511A and Q6511X, within our HP toner cartridges range. However your old unit is stamped, this is the black supply those machines were built around — a straightforward replacement that keeps a long-serving printer in service.