Nippon Kaiji Kyokai, or simply ClassNK, is a ship classification society. The Society offers a broad range of services aimed at realizing the safety of life and property at sea and the protection of the marine environment. This includes the survey of the hull, engine and other shipboard systems of new and existing ships as well as other marine structures to ensure their full compliance with classification rules developed by the Society. ClassNK also conducts a wide range of statutory surveys and inspections on behalf of Flag States. Other activities include technical consulting, appraisal and certification of ships and offshore structures, quality and environmental system assessments, as well as numerous cutting-edge R&D projects. These extensive services and activities all comprise part of the total ship care approach taken by ClassNK to help ensure the comprehensive safety of ships throughout their operating lives together with the protection of the marine environment.
Currently, some 6,800 ships totaling over 153 million gross tons are on the NK register. ClassNK is the only classification society in the world to surpass the 150 million gross tonnage mark. Based in Japan, ClassNK supports clients 24/7 through a network of 100 exclusive surveyor sites across the globe.