The self-locking nut identified by code number K 32381 is a specialized fastener used in the barring engine assembly of the ZV40/48. Designed to resist loosening under vibration and torque fluctuations, this nut incorporates a locking mechanism that maintains a secure hold without the need for additional locking devices. This is especially important in barring engines, where consistent performance and precise alignment are crucial for safe engine turning and maintenance operations. Its robust construction and self-securing function help extend maintenance intervals and enhance the safety of engine handling procedures.