Production Process

Akishima Plant Production Line

Our products are manufactured at our Akishima Plant, where the Production Administration Division manages the overall production process starting from form working, heat treatment, forming, assembly, coating, and up to quality inspection. Based on a safe and reliable operation system, we manage to provide a wide range of high quality products.

Form Working

Forming of Leaf-end, Eye Forming
Eye forming process is conducted
Heavy Duty Rolling Machine
Long Taper Leaf Spring is shaped by the Heavy Duty Rolling Machine

Heat Treatment

The curve (arch) of the leaf is formed by the Camber Forming Machine


Anti-rust coating is applied.

Load Testing
Various tests are conducted at the final stage to confirm all results are within the acceptable standards.

Why we can offer High Quality and High Reliability

The know-how and experience which we have accumulated over the years making products for many kinds of vehicles and for various uses at our safe and reliable factory enables us to offer quality products which meets our customer’s high standards.

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11-17, 4Chome, Shibaura, Minato-Ku,
Tokyo 108-0023 Japan
TEL +81-(0)3-3451-3920
FAX +81-(0)3-3451-3978