The lock nut, designated by code number K 28038, is a critical safety element in the construction of the Sulzer ZV40/48 engine. Designed to secure the special bolt K 28035, this nut prevents the bolt from loosening during engine operation, thereby protecting vital components from potential damage. Its robust construction and precise threading ensure consistent clamping force and assembly stability, even under intense vibrations and load changes. Regular checks of its tightness are vital for engine safety and operational durability.