High Speed Miniature Bearings are precision-engineered for applications requiring exceptionally high rotational speeds while maintaining compact form factors. With bore diameters typically ranging from 2 mm to 12 mm, these bearings are designed to operate at DN values (bore mm × RPM) exceeding 500,000, making them ideal for high-performance micro-rotating systems.
Characteristics: Lightweight cages (phenolic or PEEK); low viscosity grease/oil mist; controlled internal clearance (C2 to C3).
Advantages: 30% lower heat generation at 400,000 rpm vs. standard bearings. Enables electric turbochargers and dental drills to exceed 500k rpm without seizure.
Technical Ceiling: Speed factor (DN) 1.8 million; dynamic capacity retention 85% after 10^9 revolutions; temperature rise <30°C above ambient at max speed.
Caution: Standard bearings with steel cages will fail within minutes. Must use oil-air lubrication above DN 1.2M. Even slight imbalance (G1.0 vs G2.5) drastically shortens life.
Precision miniature bearings engineered for high DN values, controlled heat generation, and stable operation in dental, turbocharger, high-speed motor, and precision equipment applications.
OEM customization available | Fast engineering response | Global supply
Request an Engineering Evaluation — Send your bearing model, drawing, or operating conditions. Our engineering team will recommend a suitable configuration.
Performance values depend on bearing size, load, lubrication, speed, and test conditions.
| Parameter | Specification |
| Bore Size Range | 2 mm – 12 mm |
| Speed Factor (DN) | Up to 1.8 million, application- and configuration-dependent |
| Internal Clearance | C2 to C3, controlled |
| Cage Material | Phenolic / PEEK |
| Lubrication | Low viscosity grease / Oil mist / Oil-air |
| Dynamic Capacity Retention | ~85% after 10⁹ revolutions, tested configuration |
| Temperature Rise | < 30°C above ambient at maximum rated speed under rated conditions |
| Heat Generation | Up to 30% lower at 400,000 rpm under rated conditions |
| Speed Capability | Exceeds 500,000 rpm in optimized applications |
High-speed performance depends on more than bearing size. MTWB high speed miniature bearings are engineered around three core capabilities:
High-speed capability — optimized internal geometry and lightweight cage designs support stable operation at elevated rotational speeds.
Controlled heat generation — low-drag lubrication and precision raceway geometry help manage friction and temperature rise.
Configurable cage, clearance and lubrication — phenolic or PEEK cages, controlled C2 to C3 clearance, and low-viscosity grease, oil mist, or oil-air lubrication can be selected according to application requirements.
These three factors work together to address the heat, vibration, lubrication, and stability challenges that conventional miniature bearing configurations may face in high-DN applications.
At very high speeds, conventional steel-cage designs may become less suitable as centrifugal loading, cage friction, and ball skidding become more difficult to control. MTWB uses phenolic or PEEK cages to reduce centrifugal loading and support stable ball guidance.
High-speed operation can change bearing internal geometry through thermal expansion. Clearance that is too tight may increase preload and seizure risk, while excessive clearance can contribute to vibration and noise. MTWB provides controlled C2, C3, or application-specific clearance.
Lubrication selection becomes increasingly important as speed increases. Excessive grease churning can generate heat, while insufficient lubricant supply can lead to starvation. MTWB offers low-viscosity grease, oil mist, and oil-air lubrication. For applications above approximately DN 1.2 million, oil-air lubrication is typically recommended.
Raceway waviness and roundness influence vibration, friction, and heat generation. MTWB controls raceway geometry to support stable ball-race contact in demanding high-speed applications.
The appropriate configuration depends on bearing size, load, speed, lubrication, operating temperature, shaft and housing accuracy, and assembly conditions.
| Application Condition | Recommended Configuration |
| High speed with heat concerns | High speed miniature bearing |
| DN above approximately 1.2 million | Oil-air lubrication evaluation |
| Speed-sensitive precision equipment | Controlled clearance and precision raceway |
| Dental / medical high speed | Phenolic cage + low-viscosity grease |
| Turbocharger / micro-turbine | PEEK cage + suitable oil lubrication |
| High speed with electrical insulation requirements | Ceramic hybrid configuration |
| Long-life high-speed operation | PEEK cage + controlled clearance + precision raceway |
Where applicable, MTWB performance testing can evaluate heat generation, temperature rise, running smoothness, vibration, and other application-specific requirements. For example, the stated heat-generation and dynamic-capacity figures apply only to the tested configurations and specified operating conditions.
Rotor balance is also important at high rotational speeds. The required balance grade should be determined according to the complete rotating assembly and application requirements.
MTWB provides configurable high speed miniature bearing solutions according to application requirements.
| Configuration | Supply Options |
| Bore Size | 2 mm – 12 mm |
| Cage Material | Phenolic / PEEK / Customized |
| Internal Clearance | C2 / C3 / Controlled |
| Lubrication | Low-viscosity grease / Oil mist / Oil-air |
| Precision Grade | ABEC 5 / ABEC 7 / ABEC 9 |
| Bearing Structure | Open / Shielded / Sealed |
| Ring Material | Chrome steel / Stainless steel |
| Ball Material | Steel / Ceramic hybrid |
| Ceramic Hybrid | Si₃N₄ balls for reduced friction and electrical insulation |
MTWB can evaluate an existing bearing model, drawing, or sample for replacement and OEM production. If the exact bearing model is unknown, customers can provide the required bore, outer diameter, width, speed, load, and operating conditions for engineering evaluation.
MTWB high speed miniature bearings are used where compact bearing dimensions must be combined with high rotational speed, controlled heat generation, low vibration, or continuous operating stability.
| Application | Typical Requirement |
| Dental handpieces | High speed, low noise, smooth rotation |
| Electric turbochargers | High DN and heat control |
| High-speed motors | Stable operation at elevated rotational speed |
| Micro-turbines | Continuous high-speed operation |
| Semiconductor equipment | Precision and low vibration |
| Precision spindles | Smooth, stable rotation at high speed |
For high-speed miniature bearings, consistency is essential. MTWB quality control includes:
Dimensional Control
Bore accuracy
Outer diameter tolerance
Width measurement
Clearance verification
Rotation Performance
Noise testing
Vibration testing
Running smoothness inspection
Cage stability checks
Batch Reliability
Production traceability
Inspection records
Shipment verification
These controls support consistent assembly quality and batch-to-batch performance for OEM and replacement customers.
MTWB supports customers requiring:
Existing bearing replacement
New equipment development
Prototype samples
Customized specifications
Special tolerance requirements
Long-term OEM supply
Customization can include bearing dimensions, cage material, internal clearance, lubrication solution, precision grade, and packaging.
For replacement projects, customers can send an existing bearing, drawing, or sample for evaluation. For new equipment, MTWB can review the application conditions and recommend a suitable bearing configuration.
For an accurate quotation or engineering evaluation, please provide:
Bearing model or drawing, if available
Required quantity
Operating speed (rpm)
Load condition
Temperature range
Lubrication requirement
Rotor balance grade, if applicable
No bearing model? No problem. Send your speed, load, temperature, and application information. MTWB can evaluate the operating conditions and recommend a suitable configuration.
Can MTWB replace my existing high speed bearing supplier?
Yes. MTWB can evaluate an existing bearing model, drawing, sample, or application requirements for replacement and OEM supply.
Do you supply OEM high speed miniature bearings?
Yes. MTWB supports prototype development, customized specifications, and batch production for OEM customers.
What is the maximum speed?
MTWB configurations can reach DN values up to 1.8 million and speeds exceeding 500,000 rpm in optimized applications. Actual capability depends on bearing size, lubrication, load, balance, and operating conditions.
What lubrication is required?
Low-viscosity grease or oil mist can be used for many high-speed applications. For applications above approximately DN 1.2 million, oil-air lubrication is typically recommended.
What information is needed for quotation?
Send the bearing model or drawing, quantity, speed, load, temperature, lubrication requirements, and relevant application information. If no model is available, MTWB can evaluate the operating conditions.
Looking for a supplier for high speed miniature bearings, phenolic or PEEK cage bearings, ceramic hybrid bearings, dental handpiece bearings, electric turbocharger bearings, or OEM high-speed bearing solutions?
Send your bearing model, drawing, or operating conditions to MTWB.
Our engineering team can help evaluate:
Bearing configuration
Speed and lubrication requirements
Cage and clearance selection
OEM and replacement supply
[Request a Quote] [Send Your Drawing] [Ask an Engineer]
