Lennox 31K74 Blower Shaft
The Lennox 31K74 Blower Shaft is a critical replacement component engineered for heavy-duty rotation in residential and commercial air handlers. Measuring 18 inches in length with a 1-inch diameter, this shaft is manufactured from 1045 or C45 carbon steel to provide superior torsional strength and resistance to bowing under high-torque loads. As a genuine OEM Lennox part, it ensures precise tolerance matching for blower wheel hubs and bearing assemblies, preventing harmonic vibration and premature bearing failure. This component is essential for restoring the mechanical link between the blower motor and the fan assembly, maintaining design-spec CFM across the heat exchanger. Whether you are performing a seasonal overhaul or a reactive repair, this direct replacement blower shaft eliminates fitment issues common with generic alternatives. Verified for use in popular Lennox LGA, LGC, and KGA series units, it provides the structural integrity required for 24/7 air circulation in demanding HVACR environments.
Key Benefits- Precision Machined Diameter: The 1-inch shaft diameter ensures a snug fit with standard HVAC bearings and blower wheels, reducing mechanical play.
- High-Grade Steel Construction: Built from 1045 carbon steel to withstand constant rotational stress without deforming or cracking.
- OEM Compatibility: Specifically designed as a Lennox 31K74 replacement to maintain original equipment performance and airflow efficiency.
- Corrosion Resistance: Engineered to hold up in high-humidity air stream environments within furnace blower assemblies.
Is the Lennox 31K74 compatible with 5/8" or 3/4" bore blower wheels?
No, this shaft features a 1-inch diameter and requires matching 1-inch bore blower wheels and bearings. Always verify the hub size of your existing fan before installation.
Can this shaft be cut down if 18 inches is too long for my cabinet?
While technically possible, we recommend using the exact 18" blower shaft specified for your model to ensure proper balance and alignment with the motor mount and support brackets.
Does this shaft include the woodruff keys or set screws?
This is the individual Lennox blower shaft. We recommend sourcing new high-tensile set screws during replacement to ensure the blower wheel remains securely locked to the new flat-milled sections of the shaft.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Original: $76.77
-65%$76.77
$26.87Lennox 31K74 Blower Shaft
The Lennox 31K74 Blower Shaft is a critical replacement component engineered for heavy-duty rotation in residential and commercial air handlers. Measuring 18 inches in length with a 1-inch diameter, this shaft is manufactured from 1045 or C45 carbon steel to provide superior torsional strength and resistance to bowing under high-torque loads. As a genuine OEM Lennox part, it ensures precise tolerance matching for blower wheel hubs and bearing assemblies, preventing harmonic vibration and premature bearing failure. This component is essential for restoring the mechanical link between the blower motor and the fan assembly, maintaining design-spec CFM across the heat exchanger. Whether you are performing a seasonal overhaul or a reactive repair, this direct replacement blower shaft eliminates fitment issues common with generic alternatives. Verified for use in popular Lennox LGA, LGC, and KGA series units, it provides the structural integrity required for 24/7 air circulation in demanding HVACR environments.
Key Benefits- Precision Machined Diameter: The 1-inch shaft diameter ensures a snug fit with standard HVAC bearings and blower wheels, reducing mechanical play.
- High-Grade Steel Construction: Built from 1045 carbon steel to withstand constant rotational stress without deforming or cracking.
- OEM Compatibility: Specifically designed as a Lennox 31K74 replacement to maintain original equipment performance and airflow efficiency.
- Corrosion Resistance: Engineered to hold up in high-humidity air stream environments within furnace blower assemblies.
Is the Lennox 31K74 compatible with 5/8" or 3/4" bore blower wheels?
No, this shaft features a 1-inch diameter and requires matching 1-inch bore blower wheels and bearings. Always verify the hub size of your existing fan before installation.
Can this shaft be cut down if 18 inches is too long for my cabinet?
While technically possible, we recommend using the exact 18" blower shaft specified for your model to ensure proper balance and alignment with the motor mount and support brackets.
Does this shaft include the woodruff keys or set screws?
This is the individual Lennox blower shaft. We recommend sourcing new high-tensile set screws during replacement to ensure the blower wheel remains securely locked to the new flat-milled sections of the shaft.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
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Description
The Lennox 31K74 Blower Shaft is a critical replacement component engineered for heavy-duty rotation in residential and commercial air handlers. Measuring 18 inches in length with a 1-inch diameter, this shaft is manufactured from 1045 or C45 carbon steel to provide superior torsional strength and resistance to bowing under high-torque loads. As a genuine OEM Lennox part, it ensures precise tolerance matching for blower wheel hubs and bearing assemblies, preventing harmonic vibration and premature bearing failure. This component is essential for restoring the mechanical link between the blower motor and the fan assembly, maintaining design-spec CFM across the heat exchanger. Whether you are performing a seasonal overhaul or a reactive repair, this direct replacement blower shaft eliminates fitment issues common with generic alternatives. Verified for use in popular Lennox LGA, LGC, and KGA series units, it provides the structural integrity required for 24/7 air circulation in demanding HVACR environments.
Key Benefits- Precision Machined Diameter: The 1-inch shaft diameter ensures a snug fit with standard HVAC bearings and blower wheels, reducing mechanical play.
- High-Grade Steel Construction: Built from 1045 carbon steel to withstand constant rotational stress without deforming or cracking.
- OEM Compatibility: Specifically designed as a Lennox 31K74 replacement to maintain original equipment performance and airflow efficiency.
- Corrosion Resistance: Engineered to hold up in high-humidity air stream environments within furnace blower assemblies.
Is the Lennox 31K74 compatible with 5/8" or 3/4" bore blower wheels?
No, this shaft features a 1-inch diameter and requires matching 1-inch bore blower wheels and bearings. Always verify the hub size of your existing fan before installation.
Can this shaft be cut down if 18 inches is too long for my cabinet?
While technically possible, we recommend using the exact 18" blower shaft specified for your model to ensure proper balance and alignment with the motor mount and support brackets.
Does this shaft include the woodruff keys or set screws?
This is the individual Lennox blower shaft. We recommend sourcing new high-tensile set screws during replacement to ensure the blower wheel remains securely locked to the new flat-milled sections of the shaft.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
