HP 10 Black Ink Cartridge (C4840A) – Compatible Replacement | Castle Ink

This compatible ink cartridge replaces the HP Office C4840 inkjet cartridge. Every ink cartridge is fully guaranteed and designed to offer outstanding print quality. These compatible ink cartridges are the perfect option for brand users who wish to cut their cartridge costs without compromising quality.

Frequently Asked Questions

Will the C4840A ink cartridge void my HP printer warranty?
No. Under the U.S. Magnuson-Moss Warranty Act, HP cannot void your printer warranty solely because you installed a compatible (non-OEM) ink cartridge. The C4840A is designed to drop in as a direct replacement for the OEM part.

How does print quality compare to the genuine HP C4840A?
The C4840A is engineered to match the OEM cartridge's ink chemistry and head-firing characteristics, so day-to-day output should look essentially identical to the original HP C4840A. If you ever see a difference, our 100% satisfaction guarantee covers a free replacement or refund.

Which printers use the C4840A?
The C4840A fits a range of HP models (HP OfficeJet series), including the BUSINESS 3000DTN, 2000c Professional, 2000cn Professional. The full compatibility list is in the Compatible Printers section above - check your printer model there before ordering.

How much will I save versus a genuine HP C4840A?
At $17.95, the Castle Ink C4840A is about 49% less than the typical OEM retail price of $34.95. For users printing regularly, that saving compounds quickly across replacements.

When will my C4840A order ship?
Orders placed before 2pm ET ship the same business day from our U.S. warehouse with free standard shipping on orders over $50. Most U.S. customers receive their order in 2-3 business days. Expedited shipping is available at checkout.