hp 51a vs 51x — same HP black toner family for the same printers. The only real difference is page yield (and cost per page).
51A (Q7551A) is the standard-yield black — about 6,500 pages. Buy this when print volume is moderate.
51X (Q7551X) is the high-yield black — about 13,000 pages. Same fit. Fewer swaps. Better cost per page if the printer runs hard.
| Feature | 51A (Q7551A) | 51X (Q7551X) |
|---|---|---|
| Black yield | ~6,500 | ~13,000 |
| Best for | Moderate office volume | Heavy / shared printers |
| Printers | LaserJet P3005 / P3005d / P3005dn / P3005n / P3005x; MFP M3027 / M3027x · M3035 / M3035xs | |
Mono black only — there is no 51 color pack in this series. Not 05A / 55A / 80A. Read the label on the cartridge already in the printer.
We sell a compatible 51A black and a compatible 51X high-yield black, chips installed.
When to buy which: replace toner more than a couple of times a year, or the printer is shared → start with 51X (about 2× the pages). Lighter duty → 51A is enough. If the label says 51X / Q7551X, stay on X unless you intentionally want fewer pages per cartridge.
FAQ
What is hp 51a vs 51x in one sentence?
Same LaserJet P3005 / MFP M3027 / M3035 printers; 51A is standard yield (~6,500), 51X is high yield (~13,000).
Are 51A and 51X for the same printers?
Yes. Same family. Only the yield changes.
Is there a 51A 4-pack?
No. These are single black cartridges only.
Does compatible toner void the printer warranty?
Using a third-party cartridge does not by itself void HP’s limited printer warranty. Damage HP attributes to a non-HP cartridge is a different question.
Ready to order: compatible HP 51A or compatible HP 51X.