- Please contact the following phone number if you have any question for Jewel Bearings
- Miyota Works +81-267-31-1133 Open hours: 8:30-17:30 (Except weekends and holidays)
- If you have any problems for Jewel Bearing to solve, please feel free to contact to us.
- By inquiry form
Jewel bearings have been the backbone behind the watch industry for almost 70 years after receiving technical guidance by Swiss companies.
We strive to continue working to improve customer satisfaction even more.
Many years of experience of jewel bearing manufacturing
Lower price when compared to single-piece crystals.
Multi-kind large quantity production
We sell high-quality jewel bearings with the know-how of miniature parts manufacturing and detailed process control that
we have built up over the years as a watch parts manufacturer.
We have developed ultra-precise core processing technology and carry out integrated production, from raw material composition, granulation, molding, and sintering, through to final processing.
In addition to granulation technology and near net shape molding, we utilize powder molding, extrusion molding,and CIP (Cold Isostatic Pressing) molding technologies.
With precision finishing processes, we manufacture jewel bearings with sub-micron dimensional accuracy that is not available elsewhere in the market. We use ruby-colored alumina material and continue to produce and develop jewel bearings as close to single crystal quality as possible.
Near Net Shape Technology Enables Significant Process Reduction and Cost Savings
We utilize near net shape molding technology to efficiently manufacture even complex-shaped jewel bearings. This approach eliminates unnecessary processing steps, allowing us to offer high-precision products at lower costs. With our advanced capabilities in precision machining of small components, we are able to meet a wide range of customer needs.
Our jewel bearings for watches and measuring devices are available in a wide
variety and can be mass-produced to meet diverse customer needs.
CITIZEN FINEDEVICE uses our mold design knowhow that we built over years, and we are available to propose a variety of designs to meet customer needs. We run integrated production from, granulation, molding, firing, machining, process complete through inspection, and we can design the ideal design for manufacturing process according to the shape of the product.
We support the dimensions in addition to dish shape according to customer requests. We can process more complicated shapes such as cylinder or olive. Our production capacity is among the highest in the world, and we meet the demands of up to hundreds of millions products per a year.
|
Available Size |
|
|---|---|
| Inner Diameter | Φ0.06～1.2mm |
| Outer Diameter | Φ0.5～2mm |
| Thickness | 0.2～0.8mm |
| ※Other sizes can also be considered upon request | |
CITIZEN FINEDEVICE can manufacture jewel bearings according to the different usages. Please contact us.
- Please contact the following phone number if you have any question for jewel bearings
- Miyota Works +81-267-31-1133 Open hours: 8:30-17:30 (Except weekends and holidays)
- If you have any problems for jewel bearings to solve, please feel free to contact to us.
- By inquiry form
Technological characteristics of jewel bearings manufacturing
This curvature is the olive
In order to improve inner diameter accuracy, which is the key for bearings, we manufacture wire used for super-precision processing with our original wire manufacturing technology.
By giving the inner surface of the jewel bearing a rounded shape, the olive shape reduces friction and improves the retention of lubricating oil. In addition, it is highly resistant to shaft misalignment, contributing to increased efficiency and precision.
Jewel Bearing Case Study
Company name: Confidential Industry:Watch industry, measuring instrument industry, etc…
Concerns about Jewel Bearings
The customer built a system to increase the production; however, the vendors were in a difficult situation to increase the production due to the problems of production capacity and control systems; therefore, the customer was looking for a second vendor. The customer checked manufactures all over the world via the internet, but could not find a reliable company. Eventually, the customer happened to find our company and made the judgment that all the necessary conditions were met. Subsequently, the customer contacted us.
Rough estimation – Site visit to our company and marketing
The customer sent detailed specifications and drawings via e-mail, and we were asked if we are capable of performing this project and also asked to present a rough estimation. We called each member in charge and decided to accept the project and presented a rough estimation after multiple discussions regarding mass production. Since the customer was in rush enter mass production, the customer immediately visited our site and became satisfied by checking the actual state of our quality control system and technological capabilities. Later, we asked the customer to talk about the detailed business story, and we also listened to the customers enough. Both sides agreed with the business plan, made a schedule for industrialization and started making the prototype.
Production - Delivery process
To meet the strict requirements, we gathered detailed data and made improvements at the same time to each manufacturing process, and submitted test samples multiple times. We also discussed problems with the customer each week and solved any problems. We were able to attain approval from not only the customer, but also from the certification authority.
Pricing and Delivery date
When we decided the final mass production volume, we proposed the official estimation and cost roadmap. The initial price for the mass production was a slightly expensive compare to the 1st vendor’s estimate; however, we were able to show the roadmap along with the price, and we could reach agreement. We could also delivered the product by the specific delivery date.
Customer feedback
The customer acknowledged our capability of quality and technique and promised to first come to us when making new product inquiries in the future. We continue to gain 100% score in “Vendor assessment” based on initial delivery. CITIZEN FINEDEVICE is recognized as the top vendor for satisfaction and credit improvement.
We are capable of dealing with the industries that require high quality and high precision.
- Please contact the following phone number if you have any question forJewel Bearings
- Miyota Works +81-267-31-1133 Open hours: 8:30-17:30 (Except weekends and holidays)
- If you have any problems for Jewel Bearings to solve, please feel free to contact to us.
- By inquiry form
FAQ about Jewel Bearings
Can I purchase all Jewel Bearings which are necessary for watches?
Please feel free to ask us according to your needs.
Which color can you produce?
Red, white, black, grey, blue, etc… (Translucency is adjustable for red and white)
Characteristics comparison for ceramics (hardness, wear resistance, etc…)
| Material name | Sialon | Zilconia | Alumina | Silicon nitride |
High-carbon chrome bearing steel (SUJ2) |
| Specific gravity | 3.2 | 6.0 | 3.9 | 3.2 | 7.8 |
| Vickers hardness value (Hv) | 1600 | 1300 | 1700 | 1500 | 700 |
| Vickers hardness value (Hv) | 6.0 | 5.8 | 3.0 | 6.0 | 15 |
| Thermal expansion coefficient | 3 | 10 | 8 | 3 | 10 |
What kind of materials can you use for the products?
Alumina , Zilconia , Sialon
What is the best dimension accuracy?
Hole dimension accuracy up to 6 μm is available as standard.
Please ask for further information.
CITIZEN FINEDEVICE can manufacture Jewel Bearings according to the usage. Please feel free to ask us.
- Please contact the following phone number if you have any question forJewel Bearings
- Miyota Works +81-267-31-1133 Open hours: 8:30-17:30 (Except weekends and holidays)
- If you have any problems for Jewel Bearings to solve, please feel free to contact to us.
- By inquiry form