The Harman 3-50-00465 is the correct old-style auger shaft for a wide range of Harman pellet stoves manufactured before 2009. If your stove is showing feed problems, grinding noises, or a worn or broken auger shaft, this is the OEM-spec replacement part to restore reliable pellet delivery. Also cataloged as NBK Parts 20218.
The auger shaft is the mechanical backbone of your pellet stove's fuel delivery system. It transfers rotational force from the auger motor to the auger flights, pushing pellets from the hopper into the burn pot at a controlled rate. When the shaft wears, bends, or breaks, pellet feed becomes inconsistent -- leading to weak flames, excessive ash buildup, or stove shutdowns.
The 3-50-00465 is specifically designed for the older auger assembly configuration used in Harman stoves built prior to the 2009 design revision. It is NOT interchangeable with the newer-style shaft used in post-2009 production. Confirm your stove's serial number and manufacture date before ordering.
Direct factory-specification replacement for the original old-style auger shaft. No modifications required for compatible models.
Receiving shaft outer diameter is 5/16 inch -- confirm this matches your existing hardware before installing.
Fits more than 15 Harman pellet stove and furnace models, including freestanding, insert, and whole-home heating configurations.
Cross-referenced as NBK Parts number 20218, useful when sourcing through HVAC wholesale or parts distributor channels.
The auger shaft connects the auger motor gearbox to the helical auger flights inside the fuel tube. As the motor turns, the shaft rotates the auger, which moves pellets in a steady, metered flow into the burn pot. Feed rate is controlled by the stove's control board and combustion blower logic -- but none of that matters if the shaft itself is damaged.
Common failure symptoms include: rattling or grinding from the fuel tube area, inconsistent or no pellet feed, pellets bridging in the tube, or visible damage to the shaft connection point. If your motor spins freely but pellets aren't moving, a broken or stripped shaft is a likely culprit.
The Harman 3-50-00465 fits the following stove and furnace models. Where a serial number prefix is listed, the part applies only to units with a serial number lower than the cutoff shown:
Auger shaft replacement is a moderate DIY repair. The stove must be fully cooled and unplugged before beginning. Access typically requires removing the back panel or dropping the fuel tube assembly, depending on model. The shaft slides into the auger motor gearbox output and connects to the auger flight tube. Secure per your model's service procedure.