1. Printer Ink
  2. Ink Cartridges
  3. HP 21 Black Ink Cartridge

Where do I find my printer model?

The model is nearly always found on the front or top of your printer. It usually has the manufacturer name followed by letters & numbers.

Check this ink fits your printer:

HP 21 Black Ink Cartridge (C9351AE)

£22.61 (£18.84 ex VAT)
with FREE UK Delivery

Free, Fast Delivery

Orders go by Royal Mail post, normally taking 1-2 days and guaranteed to arrive within 5 working days.

Need It Faster?

Select "Next Day" at the checkout for a guaranteed next-working-day service (morning delivery also available).

(Some orders may be sent by courier depending on availability.)

99+ In Stock
  • A original black HP ink cartridge for your printer
  • GUARANTEED to work in your HP Deskjet F4180, HP Deskjet F2180, HP Deskjet F380, and more - see all printers
  • 100% MONEY BACK GUARANTEE up to 12 months after receiving your order
  • Quality product - manufactured by HP for the best performance possible in your printer
  • HP SILVER PARTNER - we are an approved HP partner, providing only the best genuine and replacement HP products
See more product details
£22.61 inc VAT & FREE UK Delivery
  • Free UK Delivery
  • Money Back Guarantee
99+ In Stock
0 in basket
Multi-buy discount
2 - 3 £21.92 each
4+ £21.48 each
Stock up, worry free! Happily store these for 1 year

This ink cartridge is guaranteed to work in the following HP printers

View all printers

Compare With Similar HP Ink

HP 21 Black Ink Cartridge
This item: HP 21 Black Ink Cartridge
High Capacity HP 21XL Black Ink
Refilled High Capacity HP 21 Black Ink
Customer Rating
(6 reviews)
(9 reviews)
(37 reviews)
Contains Black Black Black
Page Yield 190 pages 475 pages 380 pages
Running Cost 11.9p per page 8.11p per page 3.42p per page
Type Genuine HP Product Genuine HP Product Money Saving Compatible
Product Guarantee Full 1 Year Moneyback Guarantee Full 1 Year Moneyback Guarantee Full 1 Year Moneyback Guarantee
Delivery Free Delivery Free Delivery Free Delivery
190 pages

Page Yield Up To 190 Pages

This HP 21 Black Ink Cartridge is quoted as doing up to 190 pages before needing to be replaced.

The page yield is calculated by manufacturers using ISO/IEC 24711 standards, where they print set documents of 5% page coverage until the cartridge is empty. The standard means you can compare yields between cartridges and manufacturers.

HP 21 Black Ink Cartridge can be recycled!

Every ink cartridge and toner sold by Stinkyink can now be recycled. Please let us to fight plastic waste by recycling your used cartridges. There are two ways to recycle depending on the product you have purchased. Learn more about the Stinkyink recycling scheme.

Product Description

This is an original HP 21 Black Ink Cartridge.

Designed for families and personal users who are looking for an affordably priced printing solution to satisfy modest printing needs .

Containing pigmented black inks, this C9351AE cartridge provides crisp sharp text for your letters and reports.

This cartridge contains 5ml of black ink and enjoys free delivery and our 12-month guarantee.


Capacity 5ml of ink
Page Yield 190 pages
Running Cost 11.9p per page

Running Cost

This value is calculated from manufacturer's estimates of how many pages a cartridge will print, and should only be used to compare cartridge running costs.

Page yields are estimated using the ISO standard of 5% coverage on a plain A4 page, which is roughly the length of a short letter.

GTIN 00050507470622
Colour Black
Compatibility HP Original
Brand HP
Condition New

Customer Reviews

Customer reviews for the HP 21 Black Ink Cartridge
5 star
4 star
3 star
2 star
1 star
Average customer rating
(6 reviews)

Ordering was very easy. Delivery was prompt. Great to be able to purchase ink for an old HP printer. Fantastic to be able to return the used cartridge for recycling. Will definitely continue to use Stinkyink.


Very good product ad quick delivery . All perfect !


Great price and positive experience - as always !


Easy to order with, good product, simple payment, fantastic follow up after sales. Would like a cheap next day option on royal mail for when I Have run out. Definitely continue to purchase with.


Everything fine as I would have expected from an original brand cartridge. No problem with service either. Prompt delivery only screwed up by post office.


HP 21 Black Ink. These cartridges are always reliable, and always print well. Have used them for 5 or more years now, and very pleased with them.

Show more reviews

Customer Questions & Answers

Something stopping you buying this product? Ask and we shall answer.

Responses are typically ~10 minutes between 9am and 5pm, weekdays.

Ask a question about this product
No matching questions were found.

Why we’re UK #1 For Printer Ink

Making customers happy is what motivates us all at Stinkyink which is why we’re thrilled to have the highest number of positive reviews on TrustPilot. That’s right, no printer ink supplier has received more positive customer feedback than us. We’ll continue to offer a service that is second to none. Thank you to all our loyal customers.


Buy More & Save!

All inks can be stored for 1 year

It's best to keep a spare, so you'll save money when buying 2 of any item.

These inks can be stored for 1 year without affecting performance + are covered by our money back guarantee to give you full peace of mind.

Plus there's Free Delivery on everything!