Episode 1: Birth of Japan’s First Torque Wrench

For Tohnichi, which started out as a subcontractor of Hitachi, the development of its own original products was a major dream at the time of its establishment. At that time, the use of impact wrenches by automobile manufacturers was mainstream and difficulties had to be overcome for the introduction of torque wrenches. However, the advantages of Tohnichi’s product, such as the accuracy of the torque and the strength of the arm, were recognized, and this greatly contributed to setting the course of the management at the time of the company’s establishment. Afterwards, the product lineup was rapidly broadened through the addition of ratchet mechanisms, and of click methods using toggling mechanisms.