Which situation requires the use of a castle nut as a locking device on a machine part?
When a split pin is needed to prevent nut loosening
A castle nut (castellated nut) has slots (castellations) cut across its top face.
These slots are meant to line up with a hole drilled through the bolt or stud shank.
A split pin (cotter pin) is then passed through the slot and the hole and its legs are bent open, mechanically locking the nut so it cannot rotate loose under vibration.
Therefore a castle nut is chosen exactly when a split pin is needed to prevent the nut from loosening, such as on axle nuts and wheel-hub assemblies subject to vibration.
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