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The Bard 8602-078 is an OEM Belimo actuator crank arm designed for 1/2 inch damper shaft linkage in Bard wall mount equipment, helping the economizer or damper actuator translate motor rotation into smooth, repeatable damper movement. This crank arm is used as part of the actuator linkage hardware and is a common wear or damage item during actuator replacement, damper service, or linkage realignment. Using the correct Bard factory part helps maintain proper damper travel, calibration, and dependable outdoor air control when paired with the specified actuator and linkage components for your unit.