Remanufactured for HP 21 Black (C9351AN) Ink Cartridge

U.S.-remanufactured HP 21 Black ink cartridge (C9351AN). We start with an original HP 21 — including its built-in printhead — then clean, refill and test it to match the original's ink level and print quality, for sharp black text at a lower price.

What's in the Box

• 1 × HP 21 Black (C9351AN) remanufactured ink cartridge — approx. 190 pages

Page yields are estimates based on ISO/IEC test standards at about 5% page coverage. Your results will vary with what you print.

Part Numbers & Also Known As

This cartridge replaces, or is also searched for as: C9351AN, C9351AN#140, C9351A, C9351AE, HP 21, HP21, HP No. 21, HP 21XL (C9351CE), C9508FN (HP 21 twin pack), C9509FN (HP 21/22 combo pack)

Remanufactured to a High Standard

• Genuine HP cartridges, reused: each one starts as an original HP cartridge, so you get a fresh HP printhead built into the cartridge along with the original fit.
• Cleaned and inspected: every cartridge is emptied, cleaned and checked for wear.
• Premium ink: refilled with high-quality ink formulated to match OEM color, density and page yield.
• Print-tested: each cartridge is tested for print quality before it ships.
• Better for the planet: reusing a cartridge keeps it out of a landfill.
• Guaranteed: if it doesn't print right, we'll replace it or refund you under our 1-year 100% satisfaction guarantee.

Specifications

Good to Know

HP 21 (black) and HP 22 (tri-color) work as a pair. They look like the older HP 56 and HP 57, but the families aren't interchangeable — each printer accepts only its own cartridges.

For color, pair it with our remanufactured HP 22 Tri-Color.

Compatible Printers

HP DeskJet 3900 & D-Series

• DeskJet 3910
• DeskJet 3915
• DeskJet 3918
• DeskJet 3920
• DeskJet 3930
• DeskJet 3930v
• DeskJet 3938
• DeskJet 3940
• DeskJet 3940v
• DeskJet D1311
• DeskJet D1320
• DeskJet D1330
• DeskJet D1341
• DeskJet D1360
• DeskJet D1368
• DeskJet D1415
• DeskJet D1420
• DeskJet D1430
• DeskJet D1445
• DeskJet D1455
• DeskJet D1460
• DeskJet D1468
• DeskJet D1470
• DeskJet D1520
• DeskJet D1530
• DeskJet D1550
• DeskJet D1555
• DeskJet D1558
• DeskJet D1560
• DeskJet D1568
• DeskJet D2320
• DeskJet D2330
• DeskJet D2345
• DeskJet D2360
• DeskJet D2368
• DeskJet D2430
• DeskJet D2445
• DeskJet D2460
• DeskJet D2466
• DeskJet D2468

HP DeskJet F-Series

• DeskJet F300
• DeskJet F310
• DeskJet F325
• DeskJet F335
• DeskJet F340
• DeskJet F350
• DeskJet F370
• DeskJet F375
• DeskJet F378
• DeskJet F379
• DeskJet F380
• DeskJet F385
• DeskJet F388
• DeskJet F390
• DeskJet F394
• DeskJet F2110
• DeskJet F2120
• DeskJet F2128
• DeskJet F2140
• DeskJet F2179
• DeskJet F2180
• DeskJet F2185
• DeskJet F2187
• DeskJet F2188
• DeskJet F2210
• DeskJet F2212
• DeskJet F2214
• DeskJet F2224
• DeskJet F2235
• DeskJet F2238
• DeskJet F2240
• DeskJet F2250
• DeskJet F2275
• DeskJet F2276
• DeskJet F2280
• DeskJet F2288
• DeskJet F2290
• DeskJet F4135
• DeskJet F4140
• DeskJet F4150
• DeskJet F4172
• DeskJet F4175
• DeskJet F4180
• DeskJet F4185
• DeskJet F4188
• DeskJet F4190
• DeskJet F4194

HP OfficeJet

• OfficeJet 4311
• OfficeJet 4314
• OfficeJet 4315
• OfficeJet 4315v
• OfficeJet 4315xi
• OfficeJet 5600
• OfficeJet 5605
• OfficeJet 5605z
• OfficeJet 5607
• OfficeJet 5608
• OfficeJet 5609
• OfficeJet 5610
• OfficeJet 5610v
• OfficeJet 5610xi
• OfficeJet 5615
• OfficeJet J3508
• OfficeJet J3606
• OfficeJet J3608
• OfficeJet J3625
• OfficeJet J3635
• OfficeJet J3640
• OfficeJet J3650
• OfficeJet J3680
• OfficeJet J5508
• OfficeJet J5520

HP PSC & Fax

• PSC 1401
• PSC 1402
• PSC 1403
• PSC 1406
• PSC 1408
• PSC 1410
• PSC 1410v
• PSC 1410xi
• PSC 1417
• Fax 1250
• Fax 3180

Don't see your printer? Look it up on our Find Ink by Printer page, or contact us and we'll confirm the right ink for you.

Frequently Asked Questions

Will the HP 21XL work in the same printers?
Yes. The HP 21XL holds more ink but fits every printer that takes the standard HP 21.

Will an HP 56 work instead of an HP 21?
Not in the DeskJet D-series, F-series or 3900 series. Those printers are designed for the HP 21 only.

Are remanufactured cartridges as good as the original?
Yes, when they're done right. A remanufactured cartridge reuses the original manufacturer's shell, so it fits and works like the original. Ours are refilled, print-tested before shipping and covered by our 1-year 100% satisfaction guarantee.

Will using it void my printer warranty?
No. Under the U.S. Magnuson-Moss Warranty Act, a printer maker can't void your warranty just because you used a non-original cartridge.

Will my printer show a message when I install it?
Some printers display a notice that a non-original or previously used cartridge is installed. Select OK or Continue and print as usual. If a cartridge isn't recognized, remove it, make sure any protective tape is off, wipe the contacts and reinstall it. See our guide to fixing a cartridge that isn't recognized, or contact us and we'll make it right.

How much will I save?
Remanufactured cartridges typically cost far less than OEM cartridges with the same yield. Estimate your yearly savings with our Printer Ink Cost Calculator.

When will my order ship?
Orders placed by 4 PM ET, Monday through Friday, ship the same business day from Long Island, NY. Standard USPS delivery takes 2–5 business days, and shipping is free on orders over $50. Expedited 1–2 day delivery is available at checkout.