The shaft K 73123 is a precision-machined drive component of the raw water pump in the Sulzer/Adriadiesel/Jugoturbina/Zgoda ZV40/48 engine, responsible for transmitting rotational power from the drive system to the pump impeller. Designed to operate under continuous load, vibration, and exposure to seawater-side conditions, the shaft ensures accurate alignment and smooth torque transfer. Manufactured from high-strength, corrosion-resistant material, K 73123 minimizes wear on bearings and seals, supports stable pump performance, and plays a key role in maintaining reliable engine cooling under demanding marine and industrial operating conditions.