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, 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 (as well as on the FIPS and CSPN) except on the 5C Nano form factor, which is too small to accommodate the 2D barcode.
In addition, all of the keys in the YubiKey 5 FIPS Series have the acronym “FIPS” underneath the Data Matrix code on the back, along with “v5” running up the left side of the Data Matrix code, except on the YubiKey 5C Nano, which has it on the right.
All current YubiKeys have been IP68-rated under the IEC standard 60529.
YubiKey 5 NFC
Important
The attributes listed below also apply to the YubiKey 5 NFC FIPS and YubiKey 5 NFC CSPN.
- 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 5 Nano
Important
The attributes listed below also apply to the YubiKey 5 Nano FIPS and the YubiKey 5 Nano CSPN.
- 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.
- 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.
- 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.
- 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 5C NFC
Important
The attributes listed below also apply to the YubiKey 5C FIPS and YubiKey 5C NFC CSPN.
- 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, while 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.
- 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:
Security Key Series
Important
The Security Key NFC and Security Key NFC - Enterprise Edition are available in the USB-A format, while the Security Key C NFC and Security Key C NFC - Enterprise Edition are available in the USB-C format. The attributes listed below apply to both the Security Key Series and Security Key Series - Enterprise Edition.
- Dimensions:
- Security Key NFC: 18mm x 45mm x 3.3mm
- Security Key C NFC: 18mm x 45mm x 3.7mm
- Weight:
- Security Key NFC: 3.7g
- Security Key C NFC: 4.3g
- Physical Interfaces:
- Security Key NFC: USB-A, NFC
- Security Key C NFC: 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, see:
In this guide: Security Key Series Overview
Our Support articles:
FIPS-Specific Marking
CSPN-Specific Marking
Security Key Series Marking
As of January 2023, to distinguish the keys in the security key series:
- non-Enterprise edition of the security key series: the back is black.
- YubiKey 5 Series security key series: the word FIDO is inscribed on the backs of both the Enterprise Edition and non-enterprise keys.
- Enterprise edition security key series: Have the serial number inscribed on the back of each Enterprise Edition key.
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