The locking spring washer, code 515151, is a critical fastening component used in the MAN L21/31 engine to prevent the loosening of bolted joints caused by vibration, thermal cycling, and dynamic mechanical loads. Designed with elastic spring characteristics that maintain continuous preload, it helps preserve the strength and stability of mechanical connections during long periods of engine operation. Manufactured from hardened, wear-resistant materials and protected against corrosion, the locking spring washer delivers dependable performance in demanding marine and industrial environments. By ensuring fastening integrity and reducing the risk of connection failure, this component contributes to improved operational safety, lower maintenance costs, and extended service life of engine assemblies.