MR128zz
MR Series Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
MR128zz
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.99 g
Tolerance class
ABEC1
Seal type
Shielded
For load direction
Radial
Main Dimensions
Bore diameter
8 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
12 mm
Outside diameter tolerance
-0.008mm to 0
Width
3.5 mm
Width tolerance
-0.12mm to 0
Inner Ring Dimensions
Inner ring type
Standard
Ball & Washer Dimensions
Ball diameter
1.2 mm
Ball quantity
12
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
104 lbf
Radial static load rating
49 lbf
Limiting speed
40 X 1000 rpm
Lubrication
Required
Radial internal clearance
MC3
Radial internal clearance
0.002mm to 0.013mm
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Stainless Steel
Shield material
300 Series Stainless Steel
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 1.13
/ each
In Stock
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MR128zz Bearing Product Overview & Core Advantages
The MR128zz is a metric miniature ball bearing engineered for precision applications requiring compact dimensions and reliable performance. As a single row deep groove ball bearing, it is primarily designed to support radial loads efficiently. Its shielded construction ensures contamination protection, making it a robust solution for high-speed, low-torque operations. This bearing is characterized by its small bore diameter of 8 mm and overall compact design, offering a balance of performance and space-saving attributes for demanding miniature assemblies.
MR128zz Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| MR | Miniature Bearing Series |
| 128 | Standardized size code for 8mm bore, 12mm OD, 3.5mm width |
| zz | Bearing is equipped with shields on both sides (non-contact type) for basic contaminant exclusion |
MR128zz Bearing Structural Features & Performance Benefits
- High-Speed Capability: The combination of a stainless steel cage, 12 precision balls, and optimized internal geometry enables a limiting speed of 40,000 rpm, making it suitable for high-rotation applications.
- Radial Load Capacity: With a dynamic load rating of 104 lbf and a static load rating of 49 lbf, this bearing provides reliable support for radial forces in compact designs.
- Precision & Stability: Manufactured to ABEC1 tolerance class with a controlled MC3 radial internal clearance (0.002mm to 0.013mm), ensuring smooth and consistent operation.
- Durability & Corrosion Resistance: Components made from chrome steel and a 300 series stainless steel shield offer excellent wear resistance and protection against corrosive environments.
- Compact & Lightweight: With a total weight of only 0.99 grams and minimal cross-section, it is ideal for space-constrained and weight-sensitive applications.
MR128zz Bearing Typical Application Areas
- Small Precision Motors: Ideal for spindle support in miniature DC motors and stepper motors.
- Medical Devices: Used in dental handpieces, surgical tools, and small pump systems.
- Office Automation Equipment: Critical component in printers, scanners, and small fans.
- Instrumentation & Robotics: Supports precise rotary motion in encoders, sensors, and miniature robotic joints.
- Consumer Electronics: Found in high-speed cooling fans, drones, and small power tools.
