Physical Attributes
The serial number is printed on the back of every YubiKey in the YubiKey 5 Series, YubiKey 5 FIPS Series, YubiKey 5 CSPN Series, Yubikey 5 Enhanced PIN Series, Security Key Series, and YubiKey Bio Series. The 2D barcode (Data Matrix code) of the serial number is also printed on the back of every YubiKey in the 5 Series, Security Key Series, and Bio Series except on the 5C Nano form factor, which is too small to accommodate the 2D barcode.
All current YubiKeys have been IP68-rated under the IEC standard 60529.
YubiKey NFC
Important
The attributes listed below also apply to the YubiKey 5 NFC FIPS, YubiKey 5 NFC CSPN, YubiKey 5 Enhanced PIN, and Yubico Security Key.
YubiKey - NFC and USB-A Form
- Dimensions: 18mm x 45mm x 3.3mm
- Weight: 3.7g
- Physical Interfaces: USB-A, NFC
- Operating Temperatures: 0 °C - 40 °C (32 °F - 104 °F)
- Storage Temperatures: -20 °C - 85 °C (-4 °F - 185 °F)
For more information:
YubiKey Nano
Important
The attributes listed below also apply to the YubiKey 5 Nano FIPS, the YubiKey 5 Nano CSPN, and YubiHSM.
YubiKey Nano - USB-A Form
- Dimensions: 12mm x 13mm x 3.1mm
- Weight: 0.5g
- Physical Interfaces: USB-A
- Operating Temperatures: 0 °C - 40 °C (32 °F - 104 °F)
- Storage Temperatures: -20 °C - 85 °C (-4 °F - 185 °F)
For more information:
YubiKey 5C
Important
The attributes listed below also apply to the YubiKey 5C FIPS and the YubiKey 5C CSPN.
YubiKey - USB-C Form
- Dimensions: 12.5mm x 29.5mm x 5mm
- Weight: 1.8g
- Physical Interfaces: USB-C
- Operating Temperatures: 0 °C - 40 °C (32 °F - 104 °F)
- Storage Temperatures: -20 °C - 85 °C (-4 °F - 185 °F)
For more information:
- In this guide:
- Our Support article on the YubiKey 5C.
YubiKey 5C Nano
Important
The attributes listed below also apply to the YubiKey 5C Nano FIPS and the YubiKey 5C CSPN.
YubiKey Nano - USB-C Form
- Dimensions: 12mm x 10.1mm x 7mm
- Weight: 0.7g
- Physical Interfaces: USB-C
- Operating Temperatures: 0 °C - 40 °C (32 °F - 104 °F)
- Storage Temperatures: -20 °C - 85 °C (-4 °F - 185 °F)
For more information:
YubiKey 5Ci
Important
The attributes listed below also apply to the YubiKey 5Ci FIPS and the YubiKey 5Ci CSPN.
YubiKey - USB-C and Lightning Form
- Dimensions: 12mm x 40.3mm x 5mm
- Weight: 2.9g
- Physical Interfaces: USB-C, Lightning®
- Operating Temperatures: 0 °C - 40 °C (32 °F - 104 °F)
- Storage Temperatures: -20 °C - 85 °C (-4 °F - 185 °F)
For more information:
- In this guide:
- Our Support article on the YubiKey 5Ci.
YubiKey C NFC
Important
The attributes listed below also apply to the YubiKey 5C FIPS, YubiKey 5 NFC CSPN, YubiKey 5 Enhanced PIN, and Yubico Security Key.
YubiKey - NFC and USB-C Form
- Dimensions: 18mm x 45mm x 3.7mm
- Weight: 4.3g
- Physical Interfaces: USB-C, NFC
- Operating Temperatures: 0 °C - 40 °C (32 °F - 104 °F)
- Storage Temperatures: -20 °C - 85 °C (-4 °F - 185 °F)
For more information:
- In this guide:
- Our Support article on the YubiKey 5C NFC.
YubiKey Bio Series
Important
The YubiKey Bio - FIDO Edition and the YubiKey Bio Multi-protocol Edition are available in the USB-A format. The YubiKey C Bio - FIDO Edition and YubiKey Bio C Multi-protocol Edition are available in the USB-C format. All YubiKey Bio Series keys have a maximum transfer rate of 12 Mbps. The sensors and LEDs behave the same way in both formats.
YubiKey Bio Series - NFC and USB-A Form
YubiKey Bio C Series - NFC and USB-C Form
- Dimensions:
- YubiKey Bio: 18mm x 45mm x 3.35mm
- YubiKey C Bio: 18mm x 45mm x 3.75mm
- Weight:
- YubiKey Bio: 4.3g
- YubiKey C Bio: 5.0g
- Physical Interfaces:
- YubiKey Bio: USB-A
- YubiKey C Bio: USB-C
- Operating Temperatures: 0 °C - 40 °C (32 °F - 104 °F)
- Storage Temperatures: -20 °C - 85 °C (-4 °F - 185 °F)
For more information on each YubiKey Bio option, see:
In this guide: YubiKey Bio Series Overview and YubiKey Bio Series Specifics
Our Support articles:
YubiKey Enhanced PIN Series
Important
The YubiKey Enhanced PIN series are available in both Yubico NFC forms: YubiKey NFC with a USB-A connector and YubiKey C NFC with a USB-C connector, both in addition to the Near Field Communication (NFC) connection.
YubiKey Enhanced PIN Series - NFC and USB-A Form
YubiKey Enhanced PIN Series - NFC and USB-C Form
For more information, see:
- In this guide: YubiKey 5 Series - Enhanced PIN
- Our Support article: YubiKey Hardware FIDO2 AAGUIDs
Security Key Series
Important
The Yubico Security Key series are available in both Yubico NFC forms: YubiKey NFC with a USB-A connector and YubiKey C NFC with a USB-C connector, both in addition to the Near Field Communication (NFC) connection.
Security Key Series - NFC and USB-A Form
Security Key Series - NFC and USB-C Form
For more information, see:
In this guide: Security Key Series Overview
Our Support articles:
YubiKey Markings
To aide in distguishing the YubiKeys, the back of selected YubiKeys have specific markings.
FIPS-Specific Marking
All of the keys in the YubiKey 5 FIPS Series have the acronym FIPS inscribed on the backs of the YubiKeys, underneath the Data Matrix code. v5 runs up on the left side of the Data Matrix code, except for the YubiKey 5C Nano, which has it on the right.
YubiKey Series 5 FIPS-Specific Markings
CSPN-Specific Marking
All of the keys in the YubiKey 5 CSPN Series have the acronym CSPN inscribed on the backs of the YubiKeys, underneath the Data Matrix code.
YubiKey Series 5 CSPN-Specific Markings
Enhanced PIN Marking
All of the keys in the YubiKey 5 Enhanced PIN Series have the acronym EPIN and the serial number inscribed on the backs of the YubiKeys, underneath the Data Matrix code.
YubiKey Enhanced PIN Series Markings
Security Key Series Marking
All of the keys in the YubiKey 5 Security Key Series have the acronym FIDO inscribed on the backs of the Security Keys. This applies to both the Enterprise Edition and non-enterprise Security Keys.
As of January 2023, the markings on the back of the security keys are different for the non-enterprise and enterprise editions.
- Non-Enterprise edition of the security key series the back only has FIDO inscribed.
- Enterprise Edition security key series the back has FIDO, scan code, and serial number inscribed.
Non-Enterprise Security Key Series Markings
Enterprise Security Key Series Markings
Click for Yubico Support.