MR128
MR Series Miniature Bearings
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Basic Information
Main Dimensions
Inner Ring Dimensions
Ball & Washer Dimensions
Performance
Materials
Environment & Compliance
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MR128 Bearing Product Overview & Core Advantages
The MR128 is a metric single row deep groove ball bearing engineered for precision radial load applications. This compact bearing features a minimal cross-section with just 2.5mm width, making it ideal for space-constrained assemblies requiring reliable performance. Manufactured to ABEC1 precision class with MC3 radial internal clearance, it delivers consistent operation in various mechanical systems. The open design allows for customized lubrication strategies to optimize performance across its operating temperature range of -30° to 110°C.
Model Code Technical Breakdown
| Code Element | Technical Meaning | Performance Implication |
| MR128 | Standard metric bearing designation | 8mm bore, 12mm OD, 2.5mm width |
| Open | No seals or shields | Allows for custom lubrication and high-speed operation |
| MC3 | Radial internal clearance group | 0.002mm to 0.013mm clearance for operational stability |
MR128 Bearing Structural Features & Performance Benefits
This bearing's single row deep groove construction provides excellent radial load capacity (104 lbf dynamic, 49 lbf static) while maintaining minimal cross-sectional dimensions. The stainless steel cage ensures precise ball guidance and contributes to the high limiting speed of 40,000 rpm. With 12 precision chrome steel balls of 1.2mm diameter, the MR128 achieves smooth rotation and reduced vibration. The MC3 radial clearance (0.002mm to 0.013mm) accommodates thermal expansion while maintaining operational precision. The open design, combined with ABEC1 tolerance class, makes this bearing suitable for applications requiring custom lubrication solutions and high rotational accuracy.
MR128 Bearing Typical Application Areas
- Small precision motors and miniature DC motors
- Office automation equipment including printers and scanners
- Medical devices and laboratory instrumentation
- Robotic joints and miniature automation systems
- Optical equipment and precision positioning mechanisms
- Consumer electronics requiring compact bearing solutions
