Features

Production technology of the world's
best ultrafine springs, born from the
Japanese culture of "Monozukuri".

The outer diameter of these
springs is a mere 0.06mm.

Our springs are the smallest in the world, finer than a strain of hair, and these springs are built with the "Monozukuri" spirit of FineParts Co., Ltd., an enterprise in Japan.
"Monozukuri" is a word that refers to a worker applying time and effort and putting his or her heart and soul into work while aiming for a perfect result, but this word also refers to an "attitude for handling manufacturing" that is characteristic of the Japanese.
While receiving demands from manufacturers all over the world who are concerned with the further decrease in size and further refinement of products, we continue to handle the challenges of FineParts.

The spring masters breathe life into the coiling machines.

Being able to produce the smallest springs in the world is solely thanks to spring masters.
The skills of technicians who make use of coiling machines while making minute adjustments to the machinery
are indispensable to the production of these springs. Also, parts,
such as "core arbors" that are the heart of coiling machines, are handmade and ground one at a time.
Try to imagine the size of a "core arbor" that forms the inner diameter of a spring with an outer
diameter of 0.06 mm. The height is no larger than 0.028 mm, and fine processing
that is not possible in machinery is expected.
The technologies of these various skills are gathered to complete these FineParts products.

The size of the "core arbor" is decided by the inner diameter of the spring.

All of our over 100 coiling machines are used for extremely small spring sizes with wire diameters of 0.2 mm or less.

Regular stock of wires

Open the table

We are able to respond to requests that have
difficult specifications and require short deadlines.

Design

Please inquire regarding the functionality (load, durability, etc.) of contact probes and the dimensions of components (plungers, barrels, etc.) that you are looking for. Making use of know-how from our many years of experience, we are able to create the most suitable design proposal for you speedily.

Manufacturing

We are able to respond to orders of any size, from a small amount of prototypes to large-scale productions. Because we have introduced over a hundred coiling machines in our production facilities, we provide a production capability of up to 70 million units per month (including units for ballpoint pen tips). The skill of the worker is contained in each spring.

Surface treatment

We can provide nickel plating and gold plating in-house.
Because we are able to reduce the length of time necessary for performing custom plating, we offer a significant short delivery time.

Inspection

The external appearance, as well as the measurements of all dimensions and of the load, are strictly inspected in the final inspection that is conducted in a class 10,000 clean booth. Also, with thoroughness of traceability, it is possible to trace back to the very beginning of the manufacturing process.

Inquiry for springs

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Production technology of the world's best ultrafine springs, born from the Japanese culture of "Monozukuri".

The outer diameter of these springs is a mere 0.06mm.