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  6. Gemstone (Alumina Bearings) for Machine Tools

Gemstone (Alumina Bearings) for Machine Tools

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last updated:Jan 28, 2026

Citizen Finedevice Co.,Ltd
Citizen Finedevice Co.,Ltd
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Supports high-speed rotation! Achieves both wear resistance and high precision.

In the machine tool industry, high precision and durability are required. Particularly in areas involving high-speed rotation, wear and precision degradation of bearings significantly affect product quality and lifespan. Abnormalities in bearings can lead to processing defects and machine stoppages, potentially reducing production efficiency. Citizen Fine Devices' gem (alumina bearings) achieve high wear resistance and high dimensional accuracy, contributing to the performance improvement of machine tools. 【Application Scenarios】 - Bearings for machine tools requiring high-speed rotation - Areas requiring high-precision positioning - Areas demanding stable operation over long periods 【Benefits of Implementation】 - Extended lifespan due to high wear resistance - Improved processing accuracy due to high dimensional precision - Increased productivity through stable machine operation

    Plastic bearings
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Gemstone (Alumina Bearings) for Machine Tools

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  • Related Link - https://cfd.citizen.co.jp/aluminaruby/
  • Special site - Product/service details - https://pr.mono.ipros.com/cfd-citizen/product/

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**Features** - Achieves high wear resistance and high dimensional accuracy - Consistent processing from granulation to molding, firing, and completion for a wide variety of mass production - Transparency that is extremely close to synthetic ruby - Near-net shape molding allows for the provision of blanks with dimensions close to completion - Hole diameters can be accommodated from Φ0.06 to 1.18mm, outer diameters from Φ0.5 to 2mm, and thicknesses from 0.2 to 0.8mm **Our Strengths** Citizen Fine Devices nurtures "people" through manufacturing, creates "valuable products," and contributes to a "rich future." Leveraging metal processing technology rooted in watch manufacturing, we have consistently supplied small, high-precision components to our customers for many years through a dedicated production line that encompasses process design, processing, assembly, and functional testing, along with the unique development of our own processing machines.

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Applications/Examples of results

【Usage Examples】 ■Movement for wristwatches ■Signal indicator ■Analog meter *For more details, please refer to the PDF document or feel free to contact us.

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Aluminaruby (alumina bearing)

Aluminaruby (alumina bearing)

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High-performance, high-precision ceramic components of Citizen Fine Devices.

High-performance, high-precision ceramic components of Citizen Fine Devices.

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Company information

Citizen

Citizen Finedevice Co.,Ltd

Ceramics

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The area where Citizen Fine Devices demonstrates its strength is in the realm of functional components that require small size, precision, high accuracy, and high detail. We believe that our mission is to continue providing high-value-added microdevice products by leveraging the unique technologies we have developed over many years. Utilizing metal processing technology rooted in watch manufacturing, we have consistently supplied small, high-precision components to our customers for many years through a fully integrated production line that encompasses process design, machining, assembly, and functional testing, along with the unique development of our own processing machines. Additionally, mass-producing components with high precision and efficiency using brittle materials is also one of our core technologies. By integrating material technology with ultra-precision machining, thin-film technology, and bonding technology, we produce not only high-precision components such as ceramics and quartz but also high-quality functional device products like liquid crystal devices and sensing devices. Continuing to provide high-value-added products to the market is a significant dream for our employees. We will contribute to the creation of new value through manufacturing driven by the challenge spirit of each individual, working towards the realization of that dream.

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