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Bard part number 5501-013 is an OEM cast iron drive pulley used on belt driven assemblies in Bard HVAC equipment to maintain proper speed ratio and reliable power transfer. This pulley is specified as 7 inch diameter with a 3/4 inch bore, making it a common fit for motor or blower shaft applications where correct alignment and belt tracking are critical for airflow and overall unit performance. When replacing a worn, wobbling, or damaged pulley, confirm your existing belt profile and shaft size to ensure proper fit, then verify the pulley position and set screw or key engagement during installation to help prevent vibration and premature belt wear.