The nut K 73025 is a robust fastening component used to secure shaft K 73023 within the cooling water pump assembly of the Sulzer ZV40/48 engine. Engineered to maintain axial positioning and clamping force under vibration and continuous mechanical load, this nut ensures stable retention of rotating components during operation. Manufactured from high-strength material with precise threading, it enables secure installation, reliable torque transmission, and long-term resistance to loosening. As a critical locking element, K 73025 plays an essential role in preserving shaft alignment, mechanical integrity, and dependable pump performance.