Bearings literally keep the world turning with any two components operating in contact with each other needing them. Vessels are no exception with the majority of ships running a traditional shaft based propulsion system with an oil lubricated stern tube containing white metal bearings. As a plain rather than a rolling element, or ball bearing – good alignment, adequate cooling and lubrication is essential to maintain a lifetime of performance. Being essential to ship operation and safety – white metal bearings are a particular area of interest for Classification Society Surveys.