Bore Diameter from 1 mm
Ultra-Compact Bearing Solutions
From blood pumps to micro surgical tools, from precision sensors to miniature motors — available installation space is the most fundamental design constraint in these applications. At the extreme scale of a 1 mm bore diameter, simultaneously maintaining precision, load capacity, and lubrication reliability is the most challenging engineering task in miniaturization. myonic and the MinebeaMitsumi Group possess mature miniature bearing manufacturing capabilities, providing complete miniature bearing solutions starting from 1 mm bore diameter.
Engineering challenges for ultra-compact applications
As dimensions shrink to the millimeter scale, every engineering parameter approaches physical limits, and standard bearings often reach their design boundaries.
Ultra-Compact Installation
Installation spaces with bore diameters below 3 mm impose stringent constraints on bearing ring wall thickness, cage design, and seal structures. Available space becomes the primary design constraint, and standard products often cannot be directly applied — requiring customized geometry designs and complex component solutions.
Precision Requirements
Maintaining ABEC 7 / 9 precision grades at micro scales demands extremely tight absolute manufacturing tolerance values. For bearings with 1-3 mm bore diameters, any raceway geometry errors or ball diameter deviations have a far greater relative impact at small sizes compared to standard-sized bearings — precision grinding technology is the core manufacturing capability threshold.
Load Capacity Constraints
As size decreases, static and dynamic load capacities drop significantly, yet applications such as prosthetics, surgical robots, and blood pumps often need to transmit relatively large forces within extremely small spaces. The combination of load configuration design, contact angle optimization, and material strength is key to overcoming load limitations.
Lubrication Challenges
Grease fill quantities for miniature bearings are measured in milligrams or even micrograms, and precise fill quantity control is critical to miniature bearing life. Excess fill creates churning resistance and noise; insufficient fill leads to lubrication failure. The application of biocompatible lubricants in medical miniature bearings adds additional selection constraints.
Industry-leading capability for ultra-compact applications
myonic leverages the MinebeaMitsumi Group's global miniature bearing manufacturing capabilities to provide a complete miniature bearing product line starting from 1 mm bore diameter, along with customized design services.
Miniature Bearing Series (from 1 mm Bore Diameter)
myonic miniature bearings cover the complete range from 1 mm bore diameter to standard miniature sizes, including deep groove ball bearings, angular contact bearings, and thin-section bearings, adapting to all extreme space installation requirements.
- Minimum bore diameter: 1 mm (typical configuration 1×3×1 mm)
- Miniature instrument bearings: outer diameter < 9.525 mm (3/8 inch)
- Thin-section bearings: uniform cross-section design for extreme space savings
- Angular contact miniature bearings: combining high-speed and axial load capability
- Precision ground, available in ABEC 7 / 9 precision grades
MinebeaMitsumi Group Micro Manufacturing Capability
As a member of the MinebeaMitsumi Group, myonic draws upon decades of global manufacturing expertise in micro precision components, providing one-stop miniature bearing supply from standard specifications to fully customized solutions.
- Collaborative support from sister factories within the group for complex components
- Complex bearing sub-assembly custom development
- Hybrid ceramic balls: low density effectively reduces centrifugal forces at micro scales
- Full process traceability supporting medical and aerospace certification requirements
- In-house dental turbine component manufacturing (including spindles) for one-stop supply
Real-world ultra-compact bearing applications
The following showcases typical scenarios, installation challenges, and technical solutions of miniature precision bearings in ultra-compact applications.
Some images on this page are AI-generated illustrations used where authentic photographs are not readily available. They are for visual reference only and do not represent actual product appearance or specifications.
Need a miniature bearing solution?
Our engineering team can help with selection and custom design