MR74
MR Series Miniature Bearings
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Part No.
Part No.
MR74
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.23 g
Tolerance class
ABEC1
Seal type
Open
For load direction
Radial
Main Dimensions
Bore diameter
4 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
7 mm
Outside diameter tolerance
-0.008mm to 0
Width
2 mm
Width tolerance
-0.12mm to 0
Inner Ring Dimensions
Inner ring type
Standard
Ball & Washer Dimensions
Ball diameter
1 mm
Ball quantity
8
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
59 lbf
Radial static load rating
21 lbf
Limiting speed
60 X 1000 rpm
Lubrication
Required
Radial internal clearance
0.002mm to 0.013mm
Radial internal clearance
MC3
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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MR74 Bearing Product Overview & Core Advantages
The MR74 is a metric miniature ball bearing designed for applications requiring compact size and reliable performance. As a single row deep groove ball bearing, it excels at handling radial loads and is engineered for high-speed operation. Its open design allows for versatile lubrication options, making it suitable for a wide range of precision instruments and small machinery where space is at a premium and operational reliability is critical.
MR74 Bearing Model Code Explained, Specifications & Naming Convention
The model designation MR74 follows a standard industry coding system for miniature bearings. Below is a breakdown of its key characteristics:
- MR: Series prefix indicating a miniature, radial ball bearing.
- 74: Denotes a specific size within the MR series, corresponding to the 4mm bore, 7mm OD, and 2mm width dimensions.
- Open: The bearing does not include integrated seals or shields, offering flexibility for custom lubrication.
- ABEC1: Specifies the precision tolerance class, ensuring consistent dimensional accuracy for reliable performance.
- MC3: Indicates the standard radial internal clearance group.
MR74 Bearing Structural Features & Performance Benefits
- High-Speed Capability: The combination of a stainless steel cage, eight precision balls, and an optimized internal geometry enables a high limiting speed of 60,000 rpm, making it an ideal high-speed bearing for miniature applications.
- Radial Load Capacity: Engineered with a deep groove raceway and chrome steel construction, this bearing provides a dependable radial dynamic load rating of 59 lbf, ensuring durability under operational stresses.
- Precision and Stability: Manufactured to ABEC1 tolerance standards with controlled internal clearance (MC3), the MR74 delivers smooth, low-vibration rotation essential for sensitive equipment.
- Compact and Lightweight: With an outer diameter of just 7mm and a weight of only 0.23g, it is designed for applications where minimizing size and mass is paramount.
MR74 Bearing Typical Application Areas
The MR74 miniature bearing is commonly specified in:
- Small Precision Motors (e.g., drones, RC models)
- Medical and Dental Handpieces
- Office Automation Equipment (e.g., printers, scanners)
- Instrumentation and Measurement Devices
- Small Fans and Pumps
