Industries & Applications

Examples of Where Our Springs Have Been used By utilizing our spring manufacturing technology that we have nurtured over the years,

we have solved a whole host of spring-related issues in various fields.

Case No need to replace all! Just replace the spring and it will be restored. The cost is 1/3.

No need to replace all! Just replace the spring and it will be restored. The cost is 1/3.

Client Data

Private residence

Use Spring:Torsion spring

Period:1 month

Torsion spring ordered instead of replacing a doorknob

Examples of Tokai Spring achievements

Tokai Spring Industries offers unique manufacturing technologies and services for the furniture and interior industry based on our abundant experience. There are many things that look broken and unusable at first glance, but can actually be used again if only the spring is replaced. Our springs are used to revive broken items and restore them to their original state.

Problems and challenges

The doorknob on the door of the customer’s house was broken, and the cause was a broken spring. When the customer contacted the manufacturer, they were told that the part had already been discontinued and that it was necessary to replace the entire doorknob. However, the customer liked the design and needed a custom-made spring to match the current doorknob. Moreover, no manufacturer was ready to produce the spring because the quantity required was only one.


The broken spring was sent to us, we took detailed measurements and made a drawing. The shape and spring characteristics were left unchanged, the best material was selected and the spring was manufactured to ensure longevity.


The door can now be used in the same way as before with just the right amount of force familiar to the hand, without replacing the complete doorknob. Also, the cost was much lower than the cost of replacing the doorknob.

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