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The Bard 8602-058BX is an OEM mixed air temperature sensor used to monitor air temperature in the mixed air stream so Bard wall-mounted equipment can control heating and cooling operation accurately and protect the system under changing load conditions. This factory Bard sensor is commonly specified as a 20K temperature sensor and is built to match the correct resistance curve and wiring connection expected by the unit controls, which helps avoid nuisance faults and inaccurate readings that can happen with generic substitutes. If you are troubleshooting erratic staging, improper economizer or ventilation temperature control, or temperature sensor error codes, replacing with the correct Bard 8602-058BX sensor is a reliable fix, and you should confirm compatibility by matching your unit model and serial number to the Bard parts list before ordering.
Bard uses suffixes like "BX" to manage parts internally. These do not change the physical form or function of the part.
A part number ending in "BX" simply means it is packaged in a box for shipping, rather than for internal assembly use.
Example: 8406-142BX is physically identical to 8406-142.