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Rectangular cyan toner cartridge in HP branded box

HP

HP C9731A 645A Cyan Toner Cartridge 12000 Pages

SKU CH-J2NK-WMASD MPN C9731A

Cyan toner cartridge for HP LaserJet 5500 and 5550 series printers, yielding approximately 12000 pages

  • Cartridges includedSingle Pack
  • Ink or toner colorCyan
  • Estimated page yield12000 Pages
  • Print coverage5%
  • Operating humidity range20 to 80% RH
  • Storage humidity range10 to 90% RH
  • ~12,000 pages per cartridge for high-volume printing
  • Cyan toner produces sharp, professional colour output
  • Genuine HP cartridge ensures reliable, consistent performance
  • Smart printing technology gives automatic alerts and easy ordering
  • Compatible with HP LaserJet 5500 and 5550 series printers

HP 645A Cyan Toner for LaserJet 5500/5550

This genuine HP C9731A cyan toner cartridge delivers approximately 12000 pages at 5% coverage. It is designed for the HP Color LaserJet 5500 and 5550 series printers. Offices and workgroups needing reliable, professional colour output for everyday documents will find this single-pack cartridge matches the printer’s rated speed and quality.

Installation and common issues

The cartridge uses HP’s Smart printing technology and all-in-one architecture for straightforward front-access replacement; the printer provides automatic alerts when toner runs low. Problems usually arise only if the cartridge is installed in a non-listed model or if the printer firmware does not recognise the genuine chip, which can stop printing until the correct supply is fitted.

Yield and environmental limits

The 12000-page yield assumes continuous printing at 5% coverage; heavy graphics or frequent short jobs will reduce the actual page count. Reliable operation requires an environment of 59 to 77°F and 20 to 80% relative humidity, while storage limits are -4 to 104°F and 10 to 90% humidity. Buyers who need higher capacity or a different colour must select a separate cartridge.

How it compares

Measured against everything we stock in OEM Laser Toner, at today’s prices. Recalculated every night.

Price $460.99
Pricier than about 91% of the 3,670 comparable items (median $112.99).

Specifications

Product
Brand nameHP
Model nameHP C9731A (645A)
Part numberC9731A
Ink or toner colorCyan
Performance
Estimated page yield12000 Pages
Print coverage5%
Size & build
Shipping weight2.90 kg
Package size500 × 264 × 160 mm
Compatibility
Replacement forHP
For use withHP Color LaserJet 5500, 5500dn, 5500dtn, 5500hdn, 5500n, 5550, 5550dn, 5550dtn, 5550hdn, 5550n
In the box
Cartridges includedSingle Pack
Environment & compliance
Operating humidity range20 to 80% RH
Storage humidity range10 to 90% RH
Operating temperature range59 to 77 °F (15 to 25 °C)
Storage temperature range-4 to 104 °F (-20 to 40 °C)

Other versions of this model

3 more in the same range

Questions about this item

How can I verify the cartridge is printing correctly after installing it in my HP LaserJet 5550?

The printer will run its automatic calibration cycle and the on-screen supply status should show the new cyan cartridge at full level with no error messages.

What comes in the box and do I need to purchase any additional components?

The single pack contains one HP C9731A cyan toner cartridge only; no drum unit, waste bottle or other consumables are included or required.

Which cartridge version should I choose for an HP Color LaserJet 5500dn?

Select the HP 645A cyan cartridge (part number C9731A) rated for approximately 12000 pages at 5% coverage.

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