The A ring H 16321 is a precision retaining and positioning element used in selected assemblies of the Sulzer ASL25 engine to ensure secure axial or radial fixation of components. Designed to operate reliably under vibration, thermal variation, and continuous mechanical loading, this ring prevents unintended movement during engine operation. Manufactured to tight tolerances from durable material, the H 16321 A ring supports assembly integrity, reduces wear on mating parts, and contributes to stable, long-term performance in demanding marine and industrial applications.