Custom Springs

We are ready to take on any challenge!

From large springs to small springs, here we introduce our springs that never fail to live up to expectations.

Volute Springs

Only Tokai Spring continues to pass down the manufacturing
technology for large volute springs.

Features Of Our Springs

Volute springs (bamboo springs) are springs shaped like bamboo shoots that have a rectangular cross-section wound in a conical shape. They are capable of producing a large load and absorbing energy relative to the space and volume they occupy, making them a suitable spring for shock absorbers. Plate thickness varies from 1 mm or less to thick ones of up to about 32 mm. Large volute springs can support loads up to 500 kN.

Thorough Data Management

Volute springs have been used for decades, and we receive many requests to make an identical product.
We store the manufacturing data used at that time, and so we can always provide the same volute spring as ones in the past.

Key Points on Our Devotion to Handmade Springs

We are the only company that continues to pass on the manufacturing techniques for large volute springs. A heated metal plate is formed into a spiral shape with the skill of our craftsmen, and our years and years of expertise establishes the shape and dimensions while creating “gaps”, which are the most essential parts of the volute spring, to produce the load characteristics required. We do this in a majestic and delicate fashion. All the work that goes into finishing the volute spring is true craftsmanship! If you have any problems with volute springs, please contact us at Tokai Spring.


How to Make a Volute Spring?


a. Preparations for materials
The materials of the volute spring are really long and thin boards.
We coil this around a coiling arbor to make form.

b. Coiling
We heat the materials at a high temperature after we coil it up in a spiral.
At this time, it is “a gap” to be important.


c. After coiling
This gap will be a big influence on shape, dimensions and load properties.
It is the time when experience and the skill of craftsmen stand out.
And this is a volute spring after coiling.
If you interested in this, check out our YouTube Channel!
You can see the coiling of the volute spring!

  • We support design and production even for small lots of one or two springs
    In the spring industry, our “complete custom-made production & high-mix, low-volume manufacturing” is an extremely unique production system which has not changed since our founding.
    We guarantee to deliver the quantity you need, when you need it, at high quality.
  • We support all kinds of environments with the likes of heat resistance, corrosion resistance, and durability
    Springs are very sensitive to high and low temperatures and corrosive atmospheres such as rust. Tokai Spring conducts daily verification tests to properly maintain the performance of our springs in any environment such as at temperatures of 100°C or higher, -20°C or lower, as well as for applications in which our springs are exposed to seawater or industrial water!

Specifications for Our Volute Springs

Spec category Item Specification
Non-contact specifications Load characteristics Load Max. 47ton
Load allowance Standard ±15% as installed and at max.
Travel allowance Standard ±15% as installed and at max.
Dimensional ranges Plate thickness 5.0∼32.0
Outer diameter Max. 450mm
Free length allowance Standard Min. ±2.0%
Coil diameter allowance Standard Min. ±3.0%
Durability Standard durability improvement processing Shot peening
Material SUP10(Correspond to 51CrV4,6150) Chrome-Vanadium steel for spring Material length: 4 m
Conditions of use Indoor working temperature -50∼180℃ *1
Rustproofing Standard Dipping in Acron
  • *1:Product allowable stress varies according to temperature. For more information, speak with a Tokai Spring industries engineer.

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