GT55 Shaft Key OS29708200 for O.S. Engine  [OS29708200]

GT55 shaft key — precision machined

This O.S. Engine parallel key is intended for GT55 RC engine use and is precision machined from steel to transmit torque between crankshaft and mounted hubs such as flywheels or clutch parts. It keeps rotational components indexed to reduce the risk of slippage under load.

Fitting is simple: match the shaft keyway to the hub slot, slide the key in until it seats as required by the hub fit, then assemble the hub and confirm there is no wobble. Periodically check the key for wear after bench tuning or high-RPM runs and replace if any deformation is visible.

For tuning consistency, use the key to preserve timing and orientation of external components. Do not force the part into an undersized slot; gentle seating methods are recommended. This product serves as a dependable spare for GT55 engine maintenance.