Kobe Steel Ltd's tampering with specifications has led to a scramble among the 525 customers currently affected to check the safety of their cars, planes, trains and other products.
The metals from Kobe Steel whose specifications have been falsified have been used in a dizzying array of products including air conditioners, Blu-ray discs, car doors, computer chips, copper pipes, heat exchangers, gear boxes, nuclear power plant parts, ship engines and space ships.
Toyota Motor Corp , Nissan Motor Co , Honda Motor Co , Mazda Motor Corp , Subaru Corp , Mitsubishi Motors Corp and Daihatsu Motor Co Ltd .
Honda said affected products have been used in its HondaJet, the first aircraft developed by an automaker since World War Two.
Other affected manufacturers include the world's biggest maker of passenger jets Boeing Co , Mitsubishi Heavy Industries Ltd and IHI Corp .
Railway operators across Japan including Central Japan Railway Company Co (JR Tokai), East Japan Railway Co (JR East), West Japan Railway Co (JR West), Tokyo Metro Co Ltd and Hankyu Hanshin Holdings Inc .
Chugoku Electric Power Co Inc , Hokuriku Eletric Power Co , Japan Nuclear Fuel Ltd, Kansai Electric Power Co Inc , Kyushu Electric Power Co Inc and Tokyo Electric Power Company Holdings Inc (Tepco).
Aircraft parts and engine components from Kawasaki Heavy Industries Ltd .
Defense equipment from makers MHI, IHI, Kawasaki Heavy and Komatsu Ltd .
Heat exchangers from Toyota-affiliated parts manufacturer Denso Corp .
Kobe Steel is integrated into global supply chains, supplying metals to companies including Bosch Ltd , Hyundai Motor Co , Kia Motors Corp (000270.KS), Ford Motor Co and Rolls-Royce Holdings PLC .
The steelmaker makes wire rod for engine valve springs found in half the world's cars, aluminum discs for half of the world's hard drives and 40 percent of the engine crankshafts used in large ships.