Thermo King 559032 Crankshaft Key

The Thermo King 559032 crankshaft key is a precision-machined woodruff key designed for large shaft compressor applications. Manufactured from hardened alloy steel, it withstands high mechanical stress, vibration, and elevated temperatures within the compressor drive assembly. The key secures the drive gear, pulley, or flywheel to the crankshaft, maintaining critical rotational timing. It features a standard 5/8-inch (15.875 mm) shaft slot configuration. This component is essential for compressor rebuilds and scheduled maintenance on Thermo King transport refrigeration units. Direct OEM replacement for Thermo King part numbers 55-9032 and 559-032. Compatible with X426 LS and X430 LS compressor models used across SB, SLX, SL, SMX, T-Series, and TK-Series refrigeration units. Installation requires cleaning of crankshaft keyway to remove debris prior to assembly.