TSUNEISHI IRON WORKS Co., Ltd. (Fukuyama, Hiroshima, Japan) announced to receive the certification for Approval of Manufacturers for vessel of propeller shafts and intermediate shafts from the Nippon Kaiji Kyokai (Chiyoda-ku, Tokyo; hereafter ‘ClassNK’) on December 4th, 2024. ClassNK approved for manufacturer of propeller shafts and intermediate shafts for vessels is the first case in the world as of January 2025.

Until now propeller shafts and intermediate shafts for vessels manufactured by TSUNEISHI IRON WORKS have been subject to certification inspections by each classification society for each product. We were aware of the problems with this inspection method from the point of view of manpower shortages and operational improvements and with this background, we stepped up our efforts to acquire the certification. TSUNEISHI IRON WORKS was valued for our production with constant quality over many years and for the proper operation of our quality control system.

With this approval, efficient inspections by a combination of on-site inspection by ClassNK and self-inspection by TSUNEISHI IRON WORKS have been achieved, and various operational improvements will be expected including reduced time and costs related to inspections.

TSUNEISHI IRON WORKS continues to be committed to improving quality and productivity in order to provide customers with higher-quality shaft products in the future.

■TSUNEISHI IRON WORKS Co., Ltd.
TSUNEISHI IRON WORKS produces various outfitting products, including hull blocks and stern frames, and is responsible for supplying them to TSUNEISHI SHIPBUILDING and its overseas subsidiaries in the shipbuilding business, as well as for outfitting work. In addition to the shipbuilding business, we also produce onshore structures such as floating piers and bridges. The Wakamatsu Steel Plant (Wakamatsu-ku, Kitakyushu, Fukuoka, Japan), which started operations in April 2014, utilises large facilities such as electric furnaces to develop the steel ingot and cast steel product manufacturing business and has an integrated production system from materials to processing.

Company info: https://www.tsuneishi-iw.jp/
Headquarters: 1083 Tsuneishi, Numakuma-cho, Fukuyama, Hiroshima, Japan
President: SHIMOMURA Naoya
Founded: January 1963
Capital: 100 million yen
Employees: 330 (as of the end of December 2024)
Business: Steel structure manufacturing, machining, pipes manufacturing, marine outfitting, steel ingot and casting manufacturing

For further information, please contact:
Corporate Communication and Group Branding Dept.
TSUNEISHI HOLDINGS CORPORATION
Email: pr@tsuneishi.com