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HP Inkjet Print Cartridges - HP 45 Inkjet Print Cartridge Specifications

Product name and part number

Product name
Product number
HP Inkjet print cartridge, black
HP 45 (51645A)

HP Inkjet printers and inkjet print cartridge compatibility

The HP 45 print cartridge is compatible with the following HP printers:

Color multifunction products

  • HP Officejet R40xi printer/copier/scanner
  • HP Officejet R80xi print/fax/copy/scanner
  • HP Officejet T45xi all-in-one
  • HP Officejet R60
  • HP Officejet T65xi printer/fax/copier/scanner
  • HP Officejet G95, G85xi, and G55xi series
  • HP Officejet Pro 1170 and 1175 series
  • HP Officejet Pro 1150C
  • HP Designjet 700, 750C, and 755CM
  • HP Designjet 750C Plus

HP Deskjet printers

  • HP Deskjet 1600CN
  • HP Deskjet 1220C and 1220C/PS professional series
  • HP Deskjet 1120Cxi professional series
  • HP Deskjet 1000C series
  • HP Deskjet 970C, 960C, 950C, and 930C series
  • HP Deskjet 890C, 880C, 870C, 855C, 830C, and 820C series
  • HP Deskjet 720C, and 710C series

Personal copiers

  • HP Color Copier 260
  • HP Color Copier 280
  • HP Color Copier 180
  • HP Color Copier 160

HP Photosmart

  • HP Photosmart P1100xi printer
  • HP Photosmart P1218xi printer

Ink volume and page count

Actual print cartridge life will vary depending on the type of printing that is done and on the printer used. The table below provides a guideline to determining how many pages the print cartridge will print. To calculate the approximate cost per page, divide the number of pages into the cartridge price.
Ink volume
Page count
HP 45
42 ml
833 (based on 5% coverage)

Maintenance of the cartridge

On HP Deskjet printers, opening the access door of the printer automatically moves the print cartridge to the center of the mechanism for easy access.
The printer automatically performs priming, cleaning, and capping the print cartridge to maintain optimum print quality. These operations are not visible to the user.
Proper use and handling will provide optimum print quality and print cartridge life. To keep the print cartridges in good working order, print with the cartridge once a month to keep the nozzles clear, and observe the following table:
Do not
Keep print cartridges sealed in the original packaging until ready to use. Ink can evaporate through the nozzles and through the plastic print cartridge body, reducing print cartridge life. Print cartridges have a longer life when sealed in the packaging.
After opening a print cartridge, store it in the printer in the "home position" to help prevent ink from drying out in the nozzles. This will minimize the risk of contamination with airborne dust particles.
Press the POWER button to turn off the printer rather than unplugging the printer or powering the unit off via a surge protector.
Do not cut power to the printer without turning off the POWER button. Pressing the POWER button caps the print cartridge in the service station, preventing ink from drying in the print cartridge nozzles.
Store print cartridges at room temperature.
Do not re-tape the print cartridge if you remove it from the printer. If you must remove a print cartridge, store it at room temperature in a rigid sealed plastic container. Make sure that the nozzles on the bottom of the print cartridge don't touch the side of the container.
Store unopened print cartridges in an upright position.
Do not store an unopened print cartridge on its side for long periods of time.

Recommended storage conditions

Operational temperature/humidity:
Room temperature (no extreme temperatures)
Min = -15 degrees Celsius
Max = 35 degrees Celsius
Min = -40 degrees Celsius
Max = 60 degrees Celsius

Altitude restrictions (all cartridges)

The HP 45 Inkjet print cartridge is not designed to be transported in the printer at high altitudes, such as on an airplane. Print cartridges may be transported in a rigid, sealed plastic container.
The HP 51633M and C6628A Inkjet print cartridges are the only print cartridges designed to be transported in a printer. See the document titled, "Printer/Cartridge compatibility tables," for a listing of the printers that can use the HP 51633M and C6628A print cartridge.

Installation dates

Be sure to use the HP Inkjet print cartridge by the install by date on the ink cartridge package.


HP Inkjet print cartridges are backed by HP's limited warranty. If the product is defective, contact HP or an HP retailer before the end of the warranty date. All HP Inkjet print cartridges and kits are warranted to be free from defects in materials and workmanship until the end of warranty date.
The end of warranty date is found in YYYY/MM/DD format on the print cartridge (see Figure 1 below).
Figure : Locating the "End of Warranty date"
For complete warranty information, refer to the document titled HP Ink Cartridges - Limited Warranty for HP Cartridges.

Related information

Click here to purchase the HP 45 cartridge from HP’s Store online.
For a complete selection of HP Printing Supplies, visit HP's Store online. Here you will find part numbers, specifications, and prices.
Material safety data sheets (MSDS) can be obtained from our Web site at: