Wholesale Metric Series Minature Ball Bearing Manufacturer
Shanghai Yinin Bearing & Transmission Company is a China-based manufacturer and exporter of metric series miniature ball bearings. With over 20 years in the bearing industry, we supply compact, high-precision bearings for applications where space is limited and reliability is critical. Our range covers 60, 62, 63, 68, 69, and MR series, available in chrome steel and stainless steel, with options for open, shielded, or sealed configurations.
As a Wholesale Metric Series Minature Ball Bearing supplier, we serve OEMs, distributors, and plant engineers across automation, medical devices, home appliances, and automotive sectors. We combine in-house manufacturing with a dedicated QC system to deliver consistent dimensional accuracy and low noise operation.
Our Metric Series Range
Each series is designed for specific bore sizes and load requirements. Below is a quick reference to help you match the right series to your application.
| Series |
Typical Bore Range (mm) |
Application Fit |
| 60 Series |
1 – 10 |
General low-load, high-speed applications like small motors and instruments. |
| 62 Series |
1 – 10 |
Higher radial load capacity; common in power tools and gearboxes. |
| 63 Series |
3 – 10 |
Heavier loads for compact spaces; used in pumps and conveyors. |
| 68 Series |
1 – 8 |
Ultra-thin cross-section for miniature precision devices. |
| 69 Series |
2 – 8 |
Very light load, high-speed; ideal for dental handpieces and small spindles. |
| MR Series |
1 – 6 |
Inch-dimension equivalents; widely used in RC hobbies and small appliances. |
Materials and Configurations
We manufacture our metric miniature ball bearings in two primary materials:
- Chrome steel (GCr15): Standard choice for general industrial use, offering high hardness and wear resistance.
- Stainless steel (AISI 440C): For corrosive environments, food processing, and medical devices where rust resistance is essential.
Available with metal shields (ZZ), rubber seals (2RS), or open. We also supply flanged variants if you need axial location without a shoulder—see our Flange Series for more.
Engineering and Quality Control
Our factory in Jiangsu Province operates with modern equipment and precision measuring tools. We follow a strict QC system: each process is inspected, and finished bearings undergo full inspection per customer requirements and international standards. Our technical team of 12 engineers supports custom modifications, including non-standard bore sizes, special clearances, and preload adjustments.
We understand that miniature bearings often run at high speeds with minimal lubrication. Therefore, we control raceway surface finish and ball roundness to minimize noise and vibration. For applications requiring low torque or high rigidity, we can adjust internal geometry.
Application Fit and Integration
Metric series miniature ball bearings are used across many industries. Here are typical scenarios:
Automation & Robotics
Supporting guide rollers, encoders, and small servo motors where precision and low friction are key.
Medical Devices
In surgical tools, dental drills, and diagnostic equipment requiring stainless steel and quiet operation.
Home Appliances
In vacuum motors, mixers, and cooling fans where compactness and long life are essential.
Capacity and Lead Times
Our annual production capacity reaches 8 million sets across all bearing types. We maintain stock for popular sizes, enabling shipment within 3 working days for in-stock items. For custom orders, lead time depends on complexity and quantity; we provide realistic schedules with every quotation.
Minimum order quantity is flexible—starting from 100 pieces for standard sizes—so you can test samples or manage inventory without overcommitting.
Installation and Maintenance Guidance
Proper installation is critical for miniature bearings. We recommend using an arbor press to apply force evenly on the ring being fitted, avoiding direct hammer blows. For maintenance, periodic re-lubrication with high-quality grease extends life; sealed bearings are pre-lubricated and require no re-greasing.
We provide technical documentation and can advise on shaft and housing tolerances to ensure correct fits. Our team is available for pre-sales engineering support to help you avoid common pitfalls like misalignment or excessive preload.
Information We Use to Configure Your Solution
To prepare an accurate quotation and technical proposal, we need the following details:
- Bearing series and bore size (e.g., 6200, MR63)
- Material preference (chrome steel or stainless steel)
- Sealing/shielding requirement (open, ZZ, 2RS)
- Operating speed, load, and temperature range
- Lubrication type and any special grease requirements
- Noise or vibration limits if specified
- Annual quantity and target delivery schedule
With this information, we can recommend the optimal series and configuration, confirm dimensional tolerances, and provide a competitive wholesale price.
FAQs
What is the difference between 60 and 62 series miniature ball bearings?
60 series bearings have a thinner cross-section and are lighter, making them suitable for low-load, high-speed applications. 62 series have a larger ball complement and deeper raceways, providing higher radial load capacity at moderate speeds. Choose 62 when load is a primary concern.
Do you offer stainless steel metric miniature bearings?
Yes, we manufacture all series in AISI 440C stainless steel, which offers excellent corrosion resistance and is ideal for medical, food, and marine applications. Stainless steel bearings are also available with seals or shields.
What is the minimum order quantity for wholesale purchases?
Our MOQ is 100 pieces for standard sizes, allowing you to test or use for small production runs. For non-standard or custom bearings, MOQ may be higher depending on manufacturing complexity.
Can you provide custom bore sizes or special tolerances?
Yes, we support customization. Our engineering team can modify bore diameters, widths, and internal clearances to meet your specific requirements. We also produce non-standard high-end bearings for specialized equipment.
How do you ensure quality consistency across large orders?
We implement a multi-stage inspection process from incoming materials to final assembly. Each batch is tested for dimensional accuracy, noise, and running torque. We can provide inspection reports upon request.
English
日本語
Français
Español
