HP 51A & 51X Toner Cartridges
Keep your office workflow moving smoothly with our compatible HP 51A and 51X toner cartridges, engineered specifically for high-capacity monochrome printing across the LaserJet P3005 and M3027/M3035 series. Choose between standard and high-yield variants to suit your monthly print demands, or opt for multi-packs to lower running costs further. Our 4.8 Google Star rating shows that our customers consistently receive high-quality cartridges backed by reliable performance.
Printers Compatible with HP 51A & 51X Toner Cartridges
Expected page output and replacement cycles
The standard HP 51A (Q7551A) delivers up to 6,500 pages, while the high-yield 51X (Q7551X) provides up to 12,000 pages based on the ISO/IEC 19752 standard for monochrome laser printers.
| Cartridge Number | Type | Colour | Page Yield | Cost Per Page |
|---|---|---|---|---|
| 51A | Standard | Black | 6,500 | $0.003 |
| 51X | High Yield | Black | 12,000 | $0.003 |
Cost Per Page = Total Cartridge Price ÷ Page Yield (at 5% coverage). Prices based on Compatible cartridges.
High-yield efficiency vs standard capacity
Selecting the high-yield 51X (Q7551X) cartridge nearly doubles your printed output from 6,500 to 12,000 pages, reducing total cartridge swaps by roughly 45% over the printer's lifetime. Buying a 2-pack of 51A cartridges provides an immediate discount compared to single units, ensuring you always have spare toner on hand to eliminate unexpected downtime during heavy print runs.
What to know about compatible toner cartridges
Using high-grade compatible HP 51A and 51X cartridges offers substantial savings over original manufacturer options without compromising on print density or text sharpness. Under Australian Consumer Law, using compatible cartridges does not void your printer warranty. Read our comprehensive genuine vs compatible cartridge guide to learn how third-party options match OEM standards.
Fast delivery and money-back assurance
All compatible toner cartridges purchased from Ink Depot are covered by a 90-day money-back guarantee, allowing you to buy with total peace of mind. Check our full returns policy for details. Free delivery applies on all orders over $99, dispatched rapidly from our central warehouse network located in Perth, Brisbane, Sydney, Melbourne, and Adelaide. Browse our full range of HP toner cartridges today.
Pro Tip
Before installing a new 51A or 51X cartridge, gently rock it horizontally 5 to 6 times to evenly distribute the internal toner powder; this prevents light patches on your initial print batch after storage.
Frequently Asked Questions
Will the high-yield 51X (Q7551X) cartridge fit in the exact same slot as the standard 51A?
Yes, the 51X cartridge shares the same physical external housing dimensions and rail locking mechanism as the standard 51A (Q7551A). The additional toner volume inside the 51X does not alter its external shell size, allowing it to drop into the cartridge bay of any compatible LaserJet P3005 or M3027/M3035 printer.
Can I switch from standard 51A cartridges to high-yield 51X without changing printer settings?
No driver updates or setting adjustments are required when upgrading to the 51X. Your printer will automatically recognise the cartridge and adjust internal toner level tracking accordingly.
Why does my printed page output differ from the rated 6,500 or 12,000 page yields?
Page yield figures are calculated using the ISO/IEC 19752 standard at 5% coverage per page (roughly equivalent to a short, standard business letter). Printing dense black graphics, bold legal documents, or full-page text blocks increases toner consumption per page, naturally resulting in fewer total printed pages per cartridge.
