MR72
MR Series Miniature Bearings
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Part No.
Part No.
MR72
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.43 g
Tolerance class
ABEC1
Seal type
Open
For load direction
Radial
Main Dimensions
Bore diameter
2 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
7 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
1.2 mm
Ball quantity
7
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
74 lbf
Radial static load rating
23 lbf
Limiting speed
63 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:
$ 1.91
/ each
In Stock
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MR72 Bearing Product Overview & Core Advantages
The MR72 is a metric single row deep groove ball bearing engineered for high-speed radial load applications. Characterized by its compact dimensions (2 mm bore, 7 mm OD) and lightweight construction (0.43 g), this bearing offers a reliable and efficient solution for precision mechanisms. Its open design allows for versatile lubrication options, while the ABEC1 tolerance class ensures consistent performance suitable for a wide range of industrial applications requiring dependable rotational motion.
MR72 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| MR72 | Standard model designation for this specific bearing size and series. |
| Open (Seal Type) | No integral seals or shields. This allows for higher limiting speeds and custom lubrication schemes but requires a clean operating environment. |
| MC3 | Specifies a radial internal clearance group (0.002mm to 0.013mm), suitable for applications with moderate operational temperatures and fits. |
MR72 Bearing Structural Features & Performance Benefits
- Optimized Load Capacity: The single row deep groove raceway design is primarily engineered to support significant radial loads (74 lbf dynamic, 23 lbf static), making it a robust choice for compact assemblies.
- High-Speed Capability: Featuring a stainless steel cage and an open construction, the bearing achieves a high limiting speed of 63,000 rpm, ideal for demanding, fast-rotating applications.
- Precision Engineering: Manufactured to ABEC1 precision tolerances with consistent bore and outside diameter control, ensuring smooth operation and reduced vibration.
- Durable Material Construction: Both rings and ball material are made from chrome steel, providing excellent wear resistance and longevity under standard operating conditions.
MR72 Bearing Typical Application Areas
This bearing is ideally suited for applications where compact size, light weight, and high-speed performance are critical. Key sectors include:
- Small Precision Motors (e.g., in drones, miniature fans)
- Medical and Dental Handpieces
- Instrumentation and Control Devices
- Office Automation Equipment (e.g., printers, scanners)
- High-Speed Spindles in small-scale machinery
