HP C4129A

Not every office printer handles oversized paper, but HP's tabloid-capable LaserJet 5000 and LaserJet 5100 families do — and the black toner behind both is the HP 29 series. The family's standard-yield cartridge is the 29A (C4129A); the shelf on this page is built around its high-yield sibling instead, the C4129X (HP 29X), the larger-load cartridge that print rooms running these wide-format machines usually standardize on so swaps interrupt production less often.

Paper size never changes the cartridge. A 5000 or 5100 printing letter pages on Monday and tabloid spreadsheets on Tuesday takes the identical unit either way, because compatibility follows the print engine, not the sheet. That makes this family an easy one to stock for: read the badge on the printer — 5000 series or 5100 series — and the cartridge question is already answered. What remains is a volume question. Wide-format pages lay down more toner per sheet than letter pages, so shops that live on oversized output drain cartridges faster than their page counts suggest, which is exactly the workload the high-yield 29X line exists for.

Toner Cartridges for HP C4129A

C4129X High Yield Black MICR — single cartridge — Black. Page yield: See product page.
C4129X High Yield Black — 2 Pack — Black. Page yield: See product page.
C4129X High Yield Black — 3 Pack — Black. Page yield: See product page.
C4129X High Yield Black — 5 Pack — Black. Page yield: See product page.
C4129X Premium Quality High Yield Black — 5 Pack — Black. Page yield: See product page.

Which cartridge should you buy?

Start with the honest shape of this shelf: the listings here are the high-yield 29X line. The family's standard-yield 29A is the cartridge these printers shipped with, but for busy 5000 and 5100 machines the higher-capacity build is the practical default, and it is the line stocked on this page. Within it, the real choice is quantity and build. A single-machine shop that wants plain toner should look at the multipacks, because the only single cartridge listed here is the MICR version — a specialty build whose toner is magnetic, made for printing checks, not a general-purpose upgrade. Offices running several of these printers usually take the 3-pack or 5-pack so a spare is always on the shelf, and the Premium Quality 5-pack is the same high-yield cartridge in the premium build for sites that standardize on it.

Chip, toner and everyday use

These are big cartridges for big printers, and the swap itself is unhurried work: open the top cover, lift the spent unit out by its handle, rock the new cartridge gently side to side so the toner inside sits evenly, pull the sealing tape straight out, and slide the cartridge in until it seats. The printer's chip contact reads the new unit on its own — there is nothing to register or reset by hand. Because tabloid pages consume toner faster than letter pages, the low-toner warning on a 5000 or 5100 tends to arrive sooner than the same warning on a desktop machine; treat the first warning as your reorder signal rather than waiting for faded output, and store the spare flat in its sealed bag, out of direct sun and away from radiator heat.

Frequently Asked Questions

We print wide-format pages — does that change which cartridge I need?

No. Paper size does not affect cartridge choice: the 5000 and 5100 families use the 29A/29X family whether they print letter, legal or tabloid pages. Pick the cartridge by printer model, never by paper size.

Is the standard 29A cartridge itself sold on this page?

The listings on this page are the high-yield C4129X (29X) line — singles in the MICR build and plain high-yield cartridges in multipacks. The standard-yield 29A (C4129A) is the family's other cartridge; if your machine is a light-duty 5000 or 5100, the 29X still fits it and simply lasts longer between swaps.

What is the MICR listing for?

MICR toner is magnetic toner formulated for printing bank checks, so the check's code line can be read by bank scanners. If your 5000 or 5100 prints checks, the MICR single is the one to buy; for ordinary documents it offers no advantage over the plain high-yield cartridge.

My printer is a LaserJet 5100TN — is this the right family?

Yes. Every 5100 variant, including the 5100TN, 5100DTN and 5100N, shares the same engine and the same cartridge family as the 5000 series. The full roster is in the list below.