Security Key NFC



Note: This article lists the technical specifications of the Security Key NFC. If you're looking for setup instructions for your Security Key NFC, see


The Security Key NFC provides the FIDO2 application as well as the U2F application, and can communicate using near-field communication (NFC), allowing for greater flexibility.



YubiKey Application Firmware 5.7+ Firmware 5.0 - 5.6
FIDO2 Up to 100 discoverable credentials (unlimited non-discoverable) Up to 25 discoverable credentials (unlimited non-discoverable)
FIDO U2F Unlimited credentials Unlimited credentials



The Security Key NFC uses a USB 2.0 interface as well as an NFC interface. All of the applications are available through both interfaces.




The FIDO2 application allows for secure single and multi-factor authentication, and can store up to 25 discoverable credentials (100 with firmware 5.7+). These credentials, which are protected by a PIN, enable passwordless login, where the YubiKey, unlocked by a PIN and authorized by touch, can log you in to your accounts without entering a username or password. For FIDO certification information, see YubiKey Hardware FIDO2 AAGUIDs.


USB Interface: FIDO


More about FIDO2



The U2F application can hold an unlimited number of U2F credentials.


USB Interface: FIDO


To find out if an application is compatible with the Security Key NFC, browse to the Works With YubiKey Catalog, and in YubiKey drop-down, select Security Key NFC to only display services that are compatible with it.


Physical Specifications

Form Factor

Connector: USB-A
Dimensions: 18mm x 45mm x 3.35mm
Weight: 3.6g



Operational range: 0 °C to 40 °C (32 °F to 104 °F)
Storage range: -20 °C to 85 °C (-4 °F to 185 °F)