The self-locking nut K 32380 is a specialized fastening component designed for the worm K 32323 within the associated mechanism of the Adriadiesel/Jugoturbina/Zgoda/Sulzer ZV40/48 engine. Its principal function is to securely retain the worm and maintain the required fastening condition while resisting unintended loosening caused by vibration, repeated mechanical loading, and operational movement. This locking capability is particularly important in heavy-duty engine mechanisms, where loss of fastening integrity could lead to excessive axial movement, misalignment, irregular engagement, accelerated wear, or damage to related components. Accurate thread geometry, suitable mechanical strength, and reliable self-locking characteristics are therefore essential for the K 32380 to perform consistently throughout its intended service period. During maintenance or overhaul, the nut, corresponding threads, worm, and associated contact surfaces should be inspected carefully, and the fastening arrangement should be restored according to the specified assembly requirements. By helping maintain secure positioning of the worm K 32323, the K 32380 self-locking nut contributes to reliable mechanical engagement, stable operation, and long-term durability of the associated ZV40/48 engine mechanism.