The lockring, code 06.29020-0202.0, is a precision retaining element designed to secure components in position within the MAN L21/31 engine assembly. Installed in designated grooves, it provides reliable axial retention, preventing movement of rotating or stationary parts under vibration, thermal expansion, and dynamic loads. Manufactured from high-strength spring steel and engineered for exact dimensional fit, the lockring ensures long-term stability and safe operation of critical assemblies. Its simple yet highly effective design enables quick installation and removal during maintenance, making it an essential component for maintaining alignment, structural integrity, and operational reliability in marine and power-generation applications.