HP 970 Black Ink Cartridge (CN621A)

The HP 970 Black Original Ink Cartridge (CN621A) delivers exceptional print performance for HP OfficeJet Pro X series printers. Using HP’s pigment-based ink and smart-chip technology, it provides sharp, water-resistant, fade-resistant text and graphics. Ideal for professional offices requiring high-volume printing, this cartridge produces approximately 3,000 pages per ISO standards and encourages sustainable disposal through HP’s Planet Partners program.

Product Features

High-capacity Standard-yield

Prints up to 3,000 pages at 5% coverage—delivering a long-lasting supply and reducing downtime

Professional pigment-based ink

Produces laser-quality, crisp black text that resists highlighting, smudging, and water exposure

Smart-chip intelligence

Includes integrated chip for accurate ink-level tracking, cartridge authentication, and smooth printer integration.

Water- and fade-resistant prints

Ink formulation ensures durable output that remains vibrant and clear for years

Eco-conscious recycling

Cartridges and packaging are recyclable through HP’s Planet Partners program.

Product Specifications

• Part number: CN621A (also labeled CN621AM/CN621AA)
• Color: Black
• Ink type: Pigment-based
• Page yield: ~3,000 pages at 5% ISO/IEC 24711 coverage (tested on OfficeJet Pro X451dw)
• Printhead nozzles: 42,240
• Ink volume: 56.5 mL
• Ink drop size: 17 pL
• Print technology: HP Thermal Inkjet (TIJ 4)
• Print head swath: 8.575 in (218 mm)
• Operating temperature: 5–35 °C (41–95 °F)
• Operating humidity: 10–90 % RH
• Storage temperature: –40–60 °C (–40–140 °F); humidity 10–90 % RH
• Package dimensions: 241.7 × 28.7 × 71.6 mm
• Package weight: 0.21 kg
• Compatible printers: HP OfficeJet Pro X451dw, X476dw/dn, X551dw, X576dw
• Included: One genuine HP 970 black cartridge
• OEM status: Genuine HP original standard-yield cartridge