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Image of NFC 6mm On-Metal PCB NTAG424
Close up image of an NFC 6mm On-Metal PCB NTAG424
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Side view of the NFC 6mm On-Metal PCB NTAG424
Works with:
Android
iPhone
This product is part of our Authentication range
Datasheets
Product Datasheets
NTAG424 Datasheet
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6mm On-Metal PCB NTAG424

  • Extremely small form factor
  • On-metal capable
  • Authentication NTAG424 chip
This is a round 6mm diameter PCB (printed circuit board) NFC tag. Supplied with a genuine NXP NTAG424 DNA chip. This tiny tag is supplied with an on-metal ferrite barrier and adhesive, so that this tag can be stuck onto both metal and non-metal surfaces. Thickness of 0.85mm. Supplied as individual units.

Designed specifically for integration into jewelry and watches but would suit applications where space is extremely tight.

Scan Distance on this tiny tag is extremely short. It is possible that some Android phones - particularly with a case - will not be able to scan at all. This tag is not designed for customer facing use cases but rather as security integration where the person scanning will know how and where to scan - or be using a higher powered USB reader. It will scan with a very carefully positioned iPhone, but touching is almost certainly required.

Note that the NTAG424 is an advanced chip that requires specialised software for encoding and verifying the anti-counterfeit features. Usual NFC mobile apps cannot encode these chips to work with authentication. Ixkio tag management users can use the ixkio mobile app to encode for both redirect or API with full authentication.

We can provide high-speed encoding services for these tags for ixkio users and in some cases other verification systems.

Ixkio NFC Tag Management

What is tag management ?

NFC tag management allows you to dynamically control the destination URL or landing page of your NFC tags. It provides tracking and stats, authentication services for anti-counterfiet tags, and a host of features to assist in getting the right tags in the right locations or products. Ixkio even allows you to encode your own NTAG213, iCODE or NTAG424 tags with our mobile App. 

Using ixkio

Ixkio can be used as either a redirect platform where tags are scanned and then redirected via ixkio to your landing pages, or as a Direct Response platform, where ixkio delivers the landing page. 

It's powerful, flexible software that provides a host of features to enable simple and dynamic management of your NFC tags. 

Getting started

Find out more about our ixkio NFC tag management platform or contact us for more information. 

Authentication Tags Explained

A quick guide

A normal NFC chip, such as the NTAG213, NTAG215 or iCODE SLIX can store a URL (web link) in it's memory. When scanned, it presents this link to the scanner (a mobile phone for example). It presents the same link every time, in a similar way to a QR Code. 

An authentication NFC chip, such as the NTAG424, works differently. When the URL is encoded onto the tag, a secret key is also encoded, along with some other settings. When the tag is scanned, it presents the URL but also a unique code which is generated using this secret key. This unique code changes on every scan and can be verified using an authentication server which will hold the same secret key. 

Note that the full name for the NTAG424 chip is the NTAG424 DNA. We usually just refer to it as the NTAG424 chip. 

Using authentication chips

As this code is unique for each scan, these NTAG424 NFC tags can be used for anti-counterfeit and authentication. It makes them extremely powerful as they can be used to ensure that the tag is the exact tag that you expect it to be. All from a simple scan with a mobile phone (no special app required).

Authentication chips have a huge range of use cases from the obvious protection of luxury goods, artwork and pharmacuiticals to supply chain security, document authentication, ticketing, proof of physical presence, secure log-on and more. 

Encoding authentication chips

While standard NFC tags can be easily encoded with any of the free mobile phone applications, encoding NTAG424 chips is substantially more complicated. You have four choices : 

  1. Use NXP's TagXplorer desktop software to encode the tags (note that NXP no longer support this software but at the time of writing it was still available to download)
  2. Build your own encoding system.
  3. Get Seritag to encode your tags for you
  4. Use our Ixkio Tag Management platform and encode with our ixkio mobile app.

More information

For more information on buying and using NTAG424 or other authentication chips, contact us or read more about NFC tag authentication.

 

Pricing

Seritag Product Code : ST946
Current Stock : 77 (need more?)We can typically supply additional stock of this product within 12 weeks. However, we very strongly advise you to contact us for exact production schedules for non-stock items before ordering.

Price per tag : 
10 - 99$2.81
100 - 249$2.57
250 - 499$2.28
500 - 999$2.21
1,000 - 1,999$1.95
2,000 +Contact Us
(price excludes VAT)Show prices with VAT 
(You can encode the tags yourself)
Total Cost :
$-

(excludes VAT)

 

Product Data

NFC Chip NTAG424
Interface Specification ISO 14443 / 13.56 MHz / NFC Forum Type 4
Total Memory 416 Bytes (User)
Data Retention 50 years (estimated)
Metal Surfaces (?)Yes
Unique Print (?)Not Available
Real ScanStrength (?)< 5mm
On-Metal ScanStrength (?)< 5mm
Printing Option None
Label Size 6mm Circular
Thickness 0.86 mm
Thickness (Chip Section) 0.85mm
Adhesive Yes
Antenna Type PCB
Operating Temperature -25C to +85C
Availability Stock & Special Order
Delivery Format Single Units
Customer Information
NFC Applications
Seritag
Contact
©Copyright 2026 Seritag.
Seritag is a trading name of TabDesk Ltd, a UK Registered company 10474154. VAT Registration Number GB256328005.
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Ordering Tags with Custom Print

Seritag have worked on thousands of custom print NFC projects. We will always provide recommendations and advice if we think your tags won't look great !

Creating artwork

We prefer high resolution images or vector format artwork. To help you get started, you can download our artwork guide. If you don't have access to artwork software, many of our users just use canva. And we are always here to help !

Providing artwork

You can upload artwork files here with your order, or place your order now and contact us to send files or for advice.

Production process

Once we have your artwork, we check it over and provide you on email with a pdf 'proof'. This is a visual of exactly what we will print. You can then confirm and we go to production.

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UID Scan Explained

What is a UID ?

Every genuine NFC chip (we only sell genuine chips) contains a fixed 'serial number' in it's memory. This is unique and defined by the chip manufacturer which, in most cases, is NXP. It's called the Unique ID or UID and on genuine chips, it can't be changed.

What is a UID Scan ?

Some software, typically asset management applications, uses this unique UID to identify the tag. In these cases, we can provide the list of the supplied tag UIDs as a spreadsheet so you know what they are. This is a UID scan.

Do you need a UID scan ?

Unless you are using this type of software and it specifically needs it - no.

How can you find/read the UID of a tag ?

You can't see the UID just by scanning/reading a tag. You need to use an app. To see your tag's UID, download our Seritag NFC Encoder app and use the read function.

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ID Print Explained

What is an ID Print ?

It's where we visually print a unique ID, number, QR code and/or text onto each custom printed NFC tag.

The purpose of ID Print

If you have uniquely encoded NFC tags then a visual ID or matching QR code can be printed to align with the encoding. This can help identification and deployment.

Ordering colour printed tags with ID/QR code print

If you are ordering with custom full colour artwork, then add the first ID and/or QR code onto the artwork. We then dynamically swap this out when printing. Upload your ID print/QR sequence with your encoding data. See our ID Print guide for details on creating the spreadsheet.

Ordering ID Express white labels with simple black ID/QR code print

In most cases, you don't need to provide a layout. Just upload your encoding data (see our ID Print guide). We will send a pdf proof on the layout so you can check.

Multiple ID/QR code printing

You can have one or two unique IDs, a QR code or a mix. If you have more complex requirements with a larger number of unique elements, contact us first.

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Encoding

Encoding is the action of writing data onto the NFC tag, for example a URL/weblink or some text.

Option 1 : Encode yourself

It's easy to encode small quantities of NFC tags yourself. Download the Seritag NFC Encoder app, enter a URL and hold over the tag. Note: you can't encode authentication grade NTAG424 chips with normal mobile apps.

Option 2 : Seritag encoding

We have developed and built some of the most advanced encoding machines in the industry. For larger orders or where you prefer to leave encoding to us, choose Seritag encoding. You can upload/enter encoding data with your order, or send it through to us later with your order reference.

Single or Variable encoding

Single encoding is where every tag is encoded with the same data. Variable encoding is where we encode different data onto each tag, for example a sequence or unique codes. We can also encode in batches - where a set number of tags are encoded with each data, etc. See our in-depth guide to ordering NFC tags with encoding.

Locked, Unlocked or Password Protected ?

For standard chips (NTAG213, 215, ICODE), if we lock your tags, then nobody (even us) can change the data. If the tags are unlocked then anyone with a phone can change the data (and then lock them). In some cases, we also offer password protection where the data is locked - and can be changed - with a password.

In short: if you are using the tags personally or within your company, you might choose to leave unlocked. If they in public - lock them !

Encode for Ixkio

If you are using our ixkio tag management platform, then we can encode both standard (NTAG213, 215, ICODE) tags and authentication (NTAG424) tags direct to the platform.