HP 45 Ink Cartridges (51645A)

Find HP 45 black ink cartridges (51645A) in single-cartridge and multipack options. Compare remanufactured and OEM Surplus listings, plus combo packs pairing HP 45 black with HP 23 or HP 78 color cartridges. Check each listing for its condition, pack contents, and compatible printers.

Choose HP 45 black ink or a two-pack

Replacing black ink only? Compare the HP 45 / 51645A singles and black two-packs. A black two-pack contains two black cartridges, not a black-and-color combination. Match the exact cartridge reference and your printer model before ordering.

HP 45/23 or HP 45/78 combo packs?

Choose the combination required by your printer. HP 23 and HP 78 are different color-cartridge options and should not be treated as interchangeable. Combo listings identify the color cartridge included; three-packs in this collection contain two black cartridges and one color cartridge, as labeled.

Remanufactured and OEM Surplus options

Compare the condition stated on each product. Remanufactured and OEM Surplus are distinct options; review the individual product description and photographs for condition and packaging details rather than assuming every listing is supplied the same way.

Regular black ink and specialty MICR

Specialty MICR cartridges are labeled separately from regular HP 45 black ink. Select the ink type required for your printing application and check the product details before purchasing.