Carrier KR11AZ406 Blower Pulley

The Carrier KR11AZ406 Blower Pulley is a critical mechanical drive component engineered for precise torque transmission in commercial HVAC blower systems. This factory authorized part is manufactured to exact tolerances, featuring a 4.25-inch diameter and a 5/8-inch bore size to ensure a secure fit on standard motor shafts. Designed for heavy-duty rotation, the KR11AZ406 fixed pitch pulley provides consistent belt alignment, reducing lateral stress on the blower motor and extending the service life of V-belt drive assemblies. Its robust construction resists corrosion and wear, maintaining operational integrity in high-static pressure environments. Field technicians typically utilize this Carrier OEM replacement pulley to restore factory-spec airflow in rooftop units (RTUs) and large air handlers where maintaining RPM accuracy is essential for system balance. The lightweight 1.15 lb design minimizes rotational inertia, supporting energy-efficient motor operation and quiet performance during peak load cycles.

• Precise 5/8" Bore: Ensures a tight, non-slip interface with the motor shaft for reliable power transfer.
• OEM Compatibility: Designed specifically for Carrier, Bryant, and Payne blower assemblies to maintain original equipment certification.
• Durable Construction: High-grade materials resist deforming and grooving, which prevents premature HVAC belt wear.
• Optimized Airflow: Fixed-pitch design keeps the blower wheel at the specified RPM for consistent CFM delivery.

• Is this pulley adjustable? No, the KR11AZ406 is a fixed-pitch pulley designed for specific RPM requirements. For variable speed needs, an adjustable sheave would be required.
• What tools are needed for installation? A standard hex key (Allen wrench) is typically required to secure the set screw onto the motor shaft keyway.
• Will this fit a 1/2" shaft? No, this part is specifically machined for a 5/8-inch blower motor shaft.

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.