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Close up image of an NFC 20mm On-Metal PPS Disc Tag
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Side view of the NFC 20mm On-Metal PPS Disc Tag
Works with:
Android
iPhone
This product is part of our NFC Disc Tags range
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20mm On-Metal PPS Disc Tag

  • 20mm diameter and IP68 waterproof
  • Built durably for metal and securely fixed
  • Specialised chip options available
Measuring 20mm in diameter, this robust NFC disc tag features an integrated screw hole for secure mechanical fixing, making it ideal for applications where adhesive alone is not suitable. Its durable design is well suited to asset identification, product authentication, equipment tracking, inventory management, traceability and digital engagement.

Manufactured from high-performance PPS engineering plastic, the tag is fully waterproof to IP68 and engineered to withstand harsh environments. It operates from -25 to +85°C and can withstand long-term exposure from -40 to +120°C, providing dependable performance across a wide range of industrial and commercial applications.

Designed for use on metal, the tag provides reliable NFC performance when attached to metallic surfaces. A range of NFC chip options is available, including authentication-ready chips for brands requiring secure product verification and anti-counterfeit protection.

Advanced authentication features require specialist encoding and verification software. Ixkio tag management users can encode tags using the Ixkio mobile app for both redirect and API applications, with full authentication support.

The integrated screw hole provides a simple and secure alternative to adhesive mounting, allowing the tag to be screwed, riveted or otherwise mechanically fixed to the required surface, subject to the chosen fixing method and application.

On-Metal Tags Explained

Normal NFC tags do not work when placed directly onto metal surfaces. Therefore, when using NFC tags on metal you either need to create a gap of at least 0.5 cm between the tag and the metal or you can use a special tag - called an 'on-metal' tag - which has an additional ferrite barrier material between the NFC tag and the adhesive. 

On-metal tags will work on both metal and non-metal surfaces. However, on-metal tag scan distances always tend to be slightly less than standard NFC tags so unless you need tags that will (or might) go on metal, we would strongly recommend that you go with standard tags. 

For more information and details of how on-metal tags compare with normal tags, read our on-metal NFC tag guide. 

Encoding NFC Tags

Encoding Yourself

You can encode your tags with a smartphone and it's quick and easy.

1. Download the Seritag Encoder app - it's free for both iPhone and Android users
2. Open the app and tap 'Encode', then add your URL
3. Tap 'Encode'
4. Hold your phone over the tag, and your tag will encode. That's it !

For more information, have a look at our How to encode tags with an iPhone and How to encode tags with an Android phone pages. 

Encoding by Seritag

Seritag have fast and accurate encoding services when you need a large number of tags encoded or you want to be absolutely sure that the encoding is handled correctly. 

For full information on how to order your NFC tags encoded by Seritag, read our Ordering NFC Tags with Encoding advice page. 

Encoding for Ixkio or TapStart

If you are using our Ixkio NFC tag management platform, then you can select 'Encode for ixkio' as the encoding option and we will encode to work with your ixkio account. You need to send us an email with the Folder and Tag Group where you want your tags created. 

If you would like to use our free TapStart dynamic link system, then select 'TapStart Encoding'. We will provide your unique PIN code when we send your tags. (TapStart is not available on all products)

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.

 

This is a Special Order product which we will manufacture specifically for you. Current production time is estimated at 3 weeks.

Pricing

Seritag Product Code : ST1300

Price per tag : 
250 - 499£0.93
500 - 999£0.68
1,000 - 1,999£0.56
2,000 - 4,999£0.49
5,000 - 9,999£0.45
10,000 - 19,999£0.44
20,000 +Contact Us
(price excludes VAT)Show prices with VAT 
(You can encode the tags yourself)
Total Cost :
£-

(excludes VAT)

 

Product Data

NFC Chip Various
Interface Specification Various
Total Memory Various
Data Retention Various
Metal Surfaces (?)Yes
Unique Print (?)Not Available
Real ScanStrength (?)31mm - 40mm
On-Metal ScanStrength (?)21mm - 25mm
Printing Option Laser etched ID
Thickness 2.9 mm
Adhesive Optional
Construction Material PPS High Performance Plastic
Weather Resistance High
Operating Temperature -25C to +85C
IP Rating IP68
Water Rating Waterproof
Availability 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.