HP 51A Q7551A Black LaserJet Toner Cartridge Genuine OEM High Yield Sealed

The HP 645A Black Original LaserJet Toner Cartridge (C9730A) delivers professional-quality black-and-white printing for busy offices that need sharp, consistent results and dependable performance on every job.hp+1

Key features

• Genuine HP 645A black toner cartridge, model C9730A, designed for precise, high-quality laser printing.

• Standard yield of up to approximately 13,000 pages at 5% coverage, ideal for high-volume environments that print reports, invoices, and marketing materials regularly.

• Produces crisp text and clear graphics, giving your documents a professional look suitable for client-facing presentations and internal use.

• Engineered to work seamlessly with compatible HP Color LaserJet printers to help reduce downtime, minimize reprints, and maintain consistent performance from the first page to the last.

• Original HP cartridge construction supports reliable operation and helps protect your printer investment, with easy, user-friendly installation and replacement.

Compatibility

This HP 645A Black toner is compatible with a range of HP Color LaserJet printers commonly used in business settings, including: HP Color LaserJet 5500, 5500n, 5500dn, 5500dtn, 5500hdn, 5550, 5550n, 5550dn, 5550dtn, and 5550hdn models (check your printer manual or existing cartridge for “C9730A” to confirm before ordering).

Ideal use cases

• Offices and workgroups that print large volumes of black-and-white documents and need consistent, reliable output.

• Businesses producing proposals, financial documents, forms, and everyday correspondence that must look clean, sharp, and professional.

• Users who prefer original HP toner for proven compatibility, stable performance, and to help maintain optimal printer health over time.

Environmental and quality notes

Original HP cartridges are manufactured to meet HP’s quality and reliability standards, and many use materials from recycled HP cartridges to help reduce plastic waste, making them a strong choice for offices that care about print quality and sustainability.