HP 27X Black Toner Cartridge (C4127X) – High-Yield Compatible | Castle Ink

HP 27X Black (C4127X) at a glance: a high-yield black toner cartridge rated at about 10,000 pages. Compatible: newly manufactured to HP's specifications. Fits the HP LaserJet 4000 and 4050. The imaging drum is built in. Backed by a 1-year 100% satisfaction guarantee; orders by 4 PM ET (Mon–Fri) ship the same day from Long Island, NY.

Key Facts

What's in the Box

• 1 × HP 27X Black (C4127X) compatible toner cartridge — about 10,000 pages

Page yields are the manufacturer's rating for the matching original cartridge, measured at roughly 5% page coverage under ISO/IEC 19752 or 19798 testing. Your results will vary with what you print.

Compatible Printers (10 models)

• HP LaserJet 4000 / 4000n / 4000t / 4000tn / 4000se
• HP LaserJet 4050 / 4050n / 4050t / 4050tn / 4050se

Don't mix these up: HP 27A (about 6,000 pages) and HP 27X (about 10,000 pages) both fit the LaserJet 4000 and 4050. They are not the same as HP 61A/61X (LaserJet 4100) or HP 38A (4200).

Not sure? Look up your exact model on our Find Ink by Printer page, or contact us and we'll confirm the right toner for you.

Printer guides: HP LaserJet 4050 toner guide

Part Numbers & Also Known As

This toner cartridge replaces or is also searched for as: C4127X, HP C4127X, HP 27X black, HP27X black, 27X black toner, HP 27X toner, HP27X, 27X toner, C4127X toner

Chips, Printer Messages & Installation

Installing: open the printer's top or front cover, pull out the empty cartridge by its handle, then rock the new cartridge gently side to side five or six times to spread the toner. Pull the sealing tape straight out by its tab, slide the cartridge in until it seats and close the cover.

Supply messages: if the printer shows a "non-HP supply" or "used supply" notice, press OK or Continue to keep printing. If the cartridge isn't recognized, check that all packing material is off and reseat it firmly.

Streaks or faint print: rock the cartridge again to redistribute toner and print a cleaning page from the printer menu. See laser printer streaks and lines.

Still stuck? See our guide to fixing a cartridge that isn't recognized or contact us and we'll make it right.

Compatible vs. Remanufactured vs. Original

Original (OEM) toner is new from the printer brand and costs the most. Compatible toner, like this cartridge, is newly manufactured by a third party to the original's size and page-yield specifications, so it drops into the same slot at a much lower price. Remanufactured toner is an emptied original cartridge that has been rebuilt and refilled. Castle Ink sells compatible (newly manufactured) toner and remanufactured inkjet cartridges.

Other Options for the Same Printers

• HP 27A Black Toner Cartridge (C4127A)

Frequently Asked Questions

How many pages does the HP 27X black print?

About 10,000 pages, based on HP's rating for the original C4127X at roughly 5% coverage.

Will this void my printer warranty?

No. Under the U.S. Magnuson-Moss Warranty Act, a manufacturer can't void your printer warranty just because you used a third-party or remanufactured supply. If a non-original supply directly caused damage, that specific repair might not be covered.

How long can I store it?

Sealed toner keeps for about two years at room temperature. Keep it in its bag, away from heat and direct sunlight, and store it flat.

When will my order ship?

Orders placed by 4 PM ET, Monday through Friday, ship the same business day from Long Island, NY, by USPS (2–5 business days). Expedited 1–2 day delivery is available at checkout, and shipping is free on orders over $50.