Description
Genuine HP M0H51AA Original Black GT Inkjet Printhead for HP Smart Tank & Ink Tank Printers
The Genuine HP M0H51AA Black Replacement GT Printhead is an original HP replacement printhead designed for selected HP Smart Tank, Ink Tank and DeskJet GT inkjet printers.
Also identified as the HP M0H51A Black GT Printhead, this genuine component uses pigment-based black ink technology to produce crisp text, strong black density and dependable everyday document output.
The printhead is designed to snap securely into the compatible printer carriage, allowing users to replace a damaged, blocked or non-functioning black printhead without replacing the entire printer.
Important: This product is the Black printhead only. It does not contain an ink bottle, and it does not replace the separate Tri-Colour printhead.
Key Features
- ✔ 100% Genuine HP Original Printhead
- ✔ HP Part Number: M0H51AA
- ✔ Product Model: HP M0H51A
- ✔ Printhead Colour: Black
- ✔ Pigment-Based Black Ink Technology
- ✔ HP Thermal Inkjet Printing Technology
- ✔ Produces Crisp Black Text and Graphics
- ✔ Designed for Selected HP Smart Tank and Ink Tank Printers
- ✔ User-Replaceable Snap-In Design
- ✔ Helps Restore Normal Black Printing
- ✔ Brand New Genuine HP Product
Compatible HP Printer Families
The HP M0H51AA Black GT Printhead is compatible with selected models from the following HP printer families:
- HP DeskJet GT 5800 Series
- HP Ink Tank 300 Series
- HP Ink Tank Wireless 400 Series
- HP Smart Tank 300 Series
- HP Smart Tank 500 Series
- HP Smart Tank 600 Series
- HP Smart Tank 7000 Series
- HP Smart Tank 7300 Series
- HP Smart Tank 7600 Series
- Selected HP Smart Tank Plus Models
Compatibility varies by printer model and sales region. Please confirm that your printer uses the HP M0H51A / M0H51AA Black GT printhead before ordering.
Common Compatible Models
- HP Smart Tank 500 All-in-One Series
- HP Smart Tank 510 Wireless Series
- HP Smart Tank 530 All-in-One Series
- HP Smart Tank 6005
- HP Smart Tank 610 / 615 / 617 Series
- HP Smart Tank 670 / 675 Series
- HP Smart Tank 7005
- HP Smart Tank 7305
- HP Smart Tank 7605
- HP Smart Tank Plus 550 / 571
- HP Smart Tank Plus 650 Series
- HP Ink Tank 310 / 315 / 319 Series
- HP Ink Tank Wireless 410 / 415 / 419 Series
- HP DeskJet GT 5810 / 5820 Series
Please do not rely on printer appearance alone. Match the existing black printhead number or consult the printer's HP support documentation before purchasing.
Product Specifications
| Manufacturer | HP |
| Product Name | HP M0H51A Black Replacement GT Printhead |
| Manufacturer Part Number | M0H51AA |
| Product Type | Replacement Inkjet Printhead |
| Printhead Colour | Black |
| Ink Type | Pigment-Based Black |
| Print Technology | HP Thermal Inkjet |
| Print Resolution Technology | TIJ 2.x |
| Approximate Dimensions | 116.26 × 36.46 × 100.94mm |
| Approximate Weight | 0.03kg |
| Package Contents | 1 × Black Replacement Printhead |
| Condition | Brand New Genuine HP |
| Brand Type | Genuine OEM |
What Does the Printhead Do?
The printhead receives ink from the printer's refillable ink tank and places microscopic ink droplets onto the paper. Unlike a conventional ink cartridge, the printhead is a separate component from the ink bottle.
If the black printhead becomes blocked, electrically damaged or worn, the printer may produce faded black output, missing text, streaks, blank pages or a printhead error message.
Common Reasons for Replacement
- Black ink does not print
- Black text appears faded or incomplete
- Repeated printhead cleaning does not improve output
- Vertical streaks or missing lines remain after alignment
- The printer displays a Black Printhead Error
- The existing printhead is physically damaged
- The printer no longer recognises the installed black printhead
Genuine HP Print Quality
Genuine HP printheads are engineered together with HP ink-tank printers and Original HP inks. Correct nozzle design, electrical contacts and ink-flow characteristics help provide reliable installation, consistent black output and dependable printer performance.
Using the correct genuine printhead also reduces the risk of recognition errors, leakage, poor ink flow or inconsistent print quality associated with unsuitable replacement components.
Installation Guidance
Before Installation:
- Confirm the printer specifically supports M0H51A / M0H51AA.
- Ensure sufficient black ink is available in the printer tank.
- Do not touch the electrical contacts or ink nozzles.
- Remove all protective tape and caps before installation.
- Install the printhead only in the Black printhead position.
- Complete the printhead alignment procedure after installation.
HP recommends replacing the printhead only when it is damaged or no longer functioning correctly. Follow the instructions shown on the printer display, HP Smart application or the relevant HP support guide.
Black vs Tri-Colour Printhead
| Black Printhead | HP M0H51A / M0H51AA |
| Tri-Colour Printhead | HP M0H50A / M0H50AA |
The two printheads are separate components and are installed in different carriage positions. This listing includes the Black M0H51AA printhead only.
Ink Bottles Sold Separately
The M0H51AA printhead does not contain a full supply of black ink. It draws ink from the printer's refillable ink tank.
Replacement HP black ink bottles are sold separately, and the required ink bottle number varies depending on the printer model and sales region.
Package Contents
- 1 × Genuine HP M0H51A Black Replacement GT Printhead
- HP Part Number: M0H51AA
Important Compatibility Notice
- This product is compatible only with selected HP ink-tank printer models.
- Printer compatibility may vary between regional versions of the same model.
- Match both the printer model and existing printhead number before ordering.
- This product is not an ink cartridge or refill bottle.
- This listing includes the Black printhead only.
- The separate Tri-Colour printhead is not included.
Why Buy From OzToner ?
- ✔ 100% Genuine HP Original Product
- ✔ Australian Stock
- ✔ Brand New Genuine Replacement Part
- ✔ Fast Australia-Wide Delivery
- ✔ Secure Protective Packaging
- ✔ Experienced HP Printer Specialists
- ✔ Friendly Local Customer Support
Frequently Asked Questions
Is this a genuine HP printhead?
Yes. This is a genuine HP M0H51A Black Replacement GT Printhead with manufacturer part number M0H51AA.
Is this an ink cartridge?
No. It is a replacement printhead. The printer's black ink bottle and refillable ink tank are separate.
What colour does this printhead print?
This printhead is for Black ink only.
Does it include the colour printhead?
No. The separate HP M0H50A / M0H50AA Tri-Colour printhead is not included.
When should I replace the printhead?
Replacement may be required if black output remains missing, faded or streaked after normal cleaning and alignment, or if the printer displays a black printhead failure message.
Can a blocked printhead be cleaned instead?
Run the printer's built-in printhead cleaning and alignment procedures first. If print quality does not improve after the recommended cleaning process, replacement may be necessary.
Does a new printhead include black ink?
The printhead may contain only the small amount required for manufacturing and protection. It relies on ink from the printer's refillable black ink tank for normal printing.
Can I install it myself?
Yes. It is designed as a user-replaceable component. Follow HP's instructions carefully and avoid touching the electrical contacts or print nozzles.
Will it work with every HP Smart Tank printer?
No. HP Smart Tank printers use different printhead generations. Confirm that your exact printer model supports M0H51A / M0H51AA before purchasing.
What should I do after installation?
Allow the printer to initialise the new printhead, then complete the printhead alignment and print-quality diagnostic procedures.
Can a printhead error also be caused by low ink?
Yes. Low ink, air in the ink system, dirty electrical contacts or incorrect installation can sometimes produce similar symptoms. Check the ink level and follow HP troubleshooting instructions before replacing the component.
Technical Specs
| Weight (Approximate) | 30 g |
| Product Type | Printhead |
| Manufacturer Part Number | M0H51AA |
| Manufacturer Website Address | http://www.hp.com/au/ |
| Manufacturer | HP Inc. |
| Product Model | M0H51A |
| Product Name | M0H51A Black Replacement GT Printhead |
| Brand Name | HP |
| Product Condition | Original |
| Compatibility |
HP Smart Tank Printers:
|
| Country of Origin | Malaysia |
| Print Color | Black |
| Print Technology | Inkjet |

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Refund Policy
The OZ Toner Return Policy applies to all purchases made on this website.
We recommend you read our Returns Policy carefully prior to placing an order and retain a copy of these terms and your order so you are familiar with our policy on refunds, returns and exchanges and your rights under the Australian Consumer Law.
We recommend you immediately examine goods delivered to you to ensure that there are no visible signs of damage or fault and that the goods received match the order you placed. Our exchange/return window is within 30 days of receiving your order. All incorrectly ordered or unwanted returns will incur a minimum 20% restocking fee.
Our Return Address
52A/5 Gladstone Rd, Castle Hill, NSW 2154
Exchange/Return (Consumables)
OZ Toner allows exchange/return within 30 days of receiving your order. This applies to consumable products purchased from us: inks, toners, printing and fax supplies and paper. Please scroll down to read our policy on exchange/return for scanners and printers.
If any consumable goods purchased from OZ Toner are damaged, lost in transit, incorrect or faulty, please contact us at support@oztoner.com with this information:
- Your order number
- Detailed description of the reason for return/exchange request
- Photo proof (if applicable).
For exchanges, the product/s must be in the original (new/unused) condition that you received it, in its original packaging. The customer is responsible for the postage fee to send the product/s back to us. OZ Toner will pay the postage to send the new product/s to the customer. All product/s sent back to us must use tracked post, we are not responsible for product/s lost in transit.
Exchange/Return (Hardware)
OZ Toner allows exchange/return within 30 days of receiving your order. This applies to hardware products purchased from us: scanners and printers.
If any hardware goods purchased from OZ Toner are damaged, lost in transit, incorrect or faulty, please contact us at support@oztoner.com with this information:
- Your order number
- Detailed description of the reason for return/exchange request
- Photo proof (if applicable).
Please ensure to contact us via email at support@oztoner.com before returning any items to obtain a Return Authorization Number. Return Authorizations are only valid for 14 days.
It is your obligation to pack returned products satisfactorily to prevent any damage to the items or boxes. You have a legal obligation to take reasonable care of the product/s while they are in your possession until they reach our warehouse.
When returning your purchase, we ask that you provide a Proof of Purchase (Order Confirmation Email) and where possible the product/s in original unopened packaging.
Once received back, we will issue a replacement or full/partial refund depending on actual case.
Change of Mind Returns
Please choose carefully as we do not provide a refund if you have simply changed your mind or made a wrong selection.
If you wish to exchange product/s which you have purchased in error, we will happily exchange provided that:
- You return the product/s within 30 days of purchase.
- You provide Proof of purchase (Your Order Confirmation Email)
- Product/s are unopened, unused and in its original packaging.
- A minimum of 20% restocking fee applies.
- You must bear the risk of return and is responsible for the costs of return postage.
- You must confirm the product/s are received and notify us before returning the product/s, the product/s being returned must satisfy all the return requirement stated above.
- The initial shipping fee charged, or any outbound postage incurred to ship to the customer will not be refunded or credited.
We reserve the right not to offer an exchange if the above requirements are not met.
Return shipping and costs are the responsibility of the customer. We recommend customers to send the item back with a tracked service. For high value products, the customer is also advised to use an insured shipping method.
Faulty or Damaged items
We provide refund or replacement on defective and damaged products.
You MUST contact us within 30 days of product/s being received and believed to be faulty. We will provide the contact information of manufacturer. Customer MUST contact manufacturer to request return authorization letter / DOA letter. Once we received the RA letter or DOA letter from the customer, we will initiate the return process and send customer our return instruction. When the goods are returned to us, we will offer either refund or replacement for the customer.
Items with Manufacturer Warranty:
Buyers must contact manufacturer of the item for all the warranty service within the warranty period. We will provide contact details of the manufacturer to the buyer. We have no other responsibility (including DOA) for items covered with manufacturer warranty.
Items with Onsite Manufacturer Warranty:
Buyers must contact manufacturer of the item for all the on-site warranty service within the warranty period. We will provide contact details of the manufacturer to the buyer. We have no other responsibility (including DOA) for items covered with manufacturer warranty.
Items with Return to Base Warranty:
Buyers are responsible to send back the faulty item to us. Items with valid warranty within the warranty period will be replaced with fully functional unit after checking. Please allow up to 2 weeks for replacement. We have no guarantee on product compatibility with buyers own equipment unless specified on the item listing.
Any other issues and queries, customers are welcome to send us message and email to discuss further.
Refund Conditions
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Refunds are only issued under certain circumstances, such as:
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DOA products where no exchange/replacement is possible
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Incorrect supply where the proper model cannot be provided
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Approved cases where neither replacement nor upsell option is available
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All refunds must be pre-approved by OzToner.au management before processing.
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Refunds are made via the original payment method and typically processed within 7 business days after approval.
Delivery Charges
Any product/s replaced under the Returns Policy due to being damaged, faulty or incorrect will be delivered to you free of charge.
Any returns due to you changing your mind about your purchase will incur a re-delivery fee.
Consumer Guarantees
Under the Australian Consumer Law, you have Consumer Guarantees for Goods and Services You purchase. Our product/s come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and for compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the product/s repaired or replaced if the product/s fail to be of acceptable quality and the failure does not amount to a major failure.
Where you believe an item is faulty, you must contact manufacturer to for it to be assessed within a reasonable period of time, and you must request return authorization letter from the manufacturer if the item is confirmed faulty. If there is a major failure with the item, and you have forwarded the return authorization letter granted by manufacturer to us, you may choose a refund or exchange. If the failure is minor, manufacturer will honor the warranty and repair the item for you within a reasonable time.
Where an item is damaged through misuse or abnormal use, OZ Toner cannot provide a refund, exchange or repair, whether the fault is identified by OZ Toner, the manufacturer or their service agent.
OZ Toner will require satisfactory proof of purchase before providing a remedy under the Australian Consumer Law.
For further information about the Australian Consumer Law and Consumer Guarantees, visit www.consumerlaw.gov.au.




