MR93
MR Series Miniature Bearings
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Part No.
Part No.
MR93
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.75 g
Tolerance class
ABEC1
Seal type
Open
For load direction
Radial
Main Dimensions
Bore diameter
3 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
9 mm
Outside diameter tolerance
-0.008mm to 0
Width
2.5 mm
Width tolerance
-0.12mm to 0
Inner Ring Dimensions
Inner ring type
Standard
Ball & Washer Dimensions
Ball diameter
1.588 mm
Ball quantity
6
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
109 lbf
Radial static load rating
34 lbf
Limiting speed
56 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
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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MR93 Bearing Product Overview & Core Advantages
The MR93 is a metric miniature ball bearing designed for applications requiring compact dimensions and reliable performance. As a single row deep groove ball bearing, it excels at handling primarily radial loads while also accommodating moderate axial loads in both directions. Its open design allows for versatile lubrication options, making it suitable for high-speed operation up to 56,000 rpm. Manufactured with chrome steel rings and balls and a stainless steel cage, this bearing offers excellent durability and corrosion resistance, ideal for precision instruments and small machinery where space and weight are critical constraints.
MR93 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| MR93 | Standard model number for a metric series miniature bearing with a 3mm bore, 9mm OD, and 2.5mm width. |
| Open (Seal Type) | No integral seals or shields, allowing for higher speeds and custom lubrication schemes. |
| ABEC1 | Specifies the tolerance class, indicating standard precision levels for runout and dimensional accuracy. |
| MC3 | Denotes the radial internal clearance group (C3), which is greater than normal, suitable for applications with thermal expansion or where interference fits are used. |
MR93 Bearing Structural Features & Performance Benefits
- High-Speed Capability: The combination of a stainless steel cage, six precision balls, and an open design enables a limiting speed of 56,000 rpm, making it an excellent choice for high-speed applications.
- Robust Load Capacity: With a dynamic load rating of 109 lbf and a static load rating of 34 lbf, this bearing provides reliable performance under significant radial loads for its compact size.
- Precision Engineering: Manufactured to ABEC1 tolerance class with a controlled radial internal clearance (0.002mm to 0.013mm), ensuring smooth and consistent operation with minimal vibration.
- Durable Construction: The use of chrome steel for rings and balls provides high hardness and wear resistance, while the stainless steel cage enhances corrosion resistance and cage integrity.
- Versatile Application Range: An operating temperature range from -30°C to 110°C and compliance with RoHS and REACH make it suitable for various industrial and electronic environments.
MR93 Bearing Typical Application Areas
- Small Precision Motors: Ideal for spindle support in miniature DC motors and stepper motors.
- Medical and Dental Devices: Used in handheld tools, pumps, and scanners where compact size and reliability are paramount.
- Office Automation Equipment: Critical components in printers, scanners, and copiers for paper feed rollers and scanner heads.
- Instrumentation and Control Systems: Supports shafts in encoders, gauges, and other precision measurement devices.
- Radio-Controlled Models and Drones: Provides smooth rotation for motor shafts and gearboxes in hobbyist and professional-grade models.
