Remanufactured for HP 45 Dark Black Pigment Ink Cartridge – Accufast, Buskro, Secap & Other Addressing Systems

HP 45 Dark Black Pigment Ink Cartridge at a glance: a dark black pigment ink cartridge for addressing and mailing systems. Remanufactured: a genuine HP 45 (51645A) shell, cleaned, refilled with fast-drying dark black pigment ink and print-tested. Fits Accufast, Buskro, Secap, Pitney Bowes, Rena, Bryce and AstroJet systems that take HP 45 / TIJ 2.5 cartridges. 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 × Dark Black pigment ink cartridge (remanufactured HP 45 shell) — about 42 ml

Compatible Printers (73 models)

• Accufast Freehand / CKx / LPx
• Buskro Apollo HP1600
• Pitney Bowes AddressRight DA400 / DA500 / DA50S / DA55S / DA550 / DA550e
• Pitney Bowes AddressRight DA700 / DA70S / DA75S / DA750 / DA750e / DA80F / DA900 / DA95F / DA950
• Pitney Bowes AddressRight W400 / W660 / W680 / W707 / W790 / W803 / W990
• Rena DA608 / DA610 / DA612 / DA615 / DA620
• Rena Envelope Imager I / II / III
• Rena PS-2000 / XPS-80 / XPS-90 / XPS-2000
• Secap 9K / 9K-L / 22K / 24K / 24KPSV / 26K / 30K
• Secap PrintStream I / II
• Secap V250 / V300
• Bryce 9K / 9K-L / 11K / 13K / 13K-C / 22K / 24K / 24K-P / 24K-PC / 26K / 30K
• AstroJet 300P / 500P / 1000 / 1000P / 2650P / 2800 / 2800P / 3600P / 3800 / 3800P
• AstroJet IB9000 / Imaging System II / Image Blaster

Don't mix these up: Dark black is a dense pigment black for addresses and barcodes on envelopes. For coated or glossy stock, HP C8842A Versatile Black or CQ849A Durable Black may suit better.

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

Part Numbers & Also Known As

This cartridge replaces or is also searched for as: dark black addressing ink, HP 45 dark black, 51645A dark black, dark black pigment ink cartridge, Accufast dark black ink, Secap dark black ink, Buskro dark black ink, 11251H

Chips, Printer Messages & Installation

Installing: open the print head cover on your addressing or coding system and release the empty cartridge. Pull the protective tape off the new cartridge by its tab without touching the nozzles or copper contacts, press it into the holder until it clicks and close the cover.

Printhead built in: this is an HP TIJ 2.5 cartridge (the same body as the HP 45), so the printhead is part of the cartridge and a new cartridge also renews the printhead. If print is broken, wipe the nozzle plate gently with a lint-free cloth dampened with distilled water and run a purge or prime from the system.

Between jobs: fast-drying and specialty inks dry quickly on the nozzles. Cap the cartridge or leave it in the capped station when the system sits idle.

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

Remanufactured vs. Compatible vs. Original

Original (OEM) cartridges are new from the printer brand and cost the most. Remanufactured cartridges, like this one, start as genuine original shells that are cleaned, refilled with high-quality ink and print-tested, so they fit and print like the original at a fraction of the price. Compatible cartridges are built new by a third party with their own chip. Castle Ink sells remanufactured inkjet cartridges and compatible (newly manufactured) toner.

Other Options for the Same Printers

• HP 45 Red Pigment Ink Cartridge
• HP 45 Blue Pigment Ink Cartridge
• HP 45 Green Pigment Ink Cartridge
• HP 45 Purple Pigment Ink Cartridge
• HP 45 Orange Pigment Ink Cartridge
• HP 45 Pink Pigment Ink Cartridge

Frequently Asked Questions

Will it fit my addressing system?

It fits any addressing or mailing system that takes HP 45 (51645A) / TIJ 2.5 cartridges, including Accufast, Buskro, Secap, Pitney Bowes AddressRight, Rena, Bryce and AstroJet.

Does it include a printhead?

Yes. HP 45 cartridges have the printhead built in, so every cartridge comes with fresh nozzles.

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?

Store it sealed, at room temperature and out of direct sunlight, and use it within about 24 months for best results. Once opened, install it promptly.

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.