HP DeskJet F340 Ink Cartridges
Your HP DeskJet F340 printer uses the HP 21 black ink cartridge. Ink Depot has been supplying genuine consumables for this printer since Sep 2026. The HP DeskJet F340 is a compact all-in-one inkjet printer designed for basic home document printing, scanning, and copying. Our 4.8 Google rating reflects a long-standing track record of premium cartridge performance. For routine text printing and everyday home tasks, the HP 21 (C9351AA) black ink cartridge delivers consistent text clarity.
Expected page output and usage
Standard page yield figures for inkjet cartridges are measured using ISO/IEC 24711 standard testing under 5% A4 page coverage. Actual page yield varies depending on print density, font size, and printing frequency in everyday home environments.
| Cartridge Number | Type | Colour | Page Yield | Cost Per Page |
|---|---|---|---|---|
| 21 | Standard | Black | 185 | $0.24 |
Cost Per Page = Total Cartridge Price ÷ Page Yield (at 5% coverage). Prices based on Genuine cartridges.
Ordering ink and delivery options
If you print text documents regularly, keeping a spare HP 21 (C9351AA) black cartridge on hand prevents unexpected downtime. All products are backed by our straight-forward Returns policy. Orders are dispatched quickly from fast-fulfilment warehouses located in Perth, Brisbane, Sydney, Melbourne and Adelaide. Free delivery applies on all orders over $99. Browse our comprehensive range of HP ink cartridges to keep your printer running smoothly.
Smart cartridge tip
Verify your exact printer model code before purchase; inserting cartridges from physically similar HP families can lead to non-recognition errors, so ensure you choose the HP 21 (C9351AA) code specifically designed for the DeskJet F340.
Frequently Asked Questions
Can the HP DeskJet F340 print using only the HP 21 black cartridge?
Yes, the HP DeskJet F340 supports single-cartridge printing mode. If the colour cartridge is depleted or missing, the printer can operate using solely the HP 21 (C9351AA) black cartridge to produce monochrome text documents.
What page yield should I expect from an HP 21 black ink cartridge?
The HP 21 (C9351AA) standard black ink cartridge provides an estimated yield of 185 pages based on standard 5% coverage on A4 paper. Heavy page coverage or frequent printing will reduce total output.
How long does an unopened HP 21 ink cartridge remain usable?
When stored upright in its original sealed foil packaging in a cool, dry area away from direct light, a genuine HP 21 cartridge retains print quality for 18 to 24 months from manufacture.
