SMF74zz
SMF Series Stainless Steel Flanged Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
SMF74zz
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.4 g
Tolerance class
ABEC1
Seal type
Shielded
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
2.5 mm
Width tolerance
-0.12mm to 0
Inner Ring Dimensions
Inner ring type
Standard
Outer Ring Dimensions
Flange outer diameter
8.2 mm
Flange thickness
0.6 mm
Ball & Washer Dimensions
Ball diameter
1 mm
Ball quantity
8
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
44 lbf
Radial static load rating
17 lbf
Limiting speed
54 X 1000 rpm
Lubrication
Required
Radial internal clearance
MC3
Radial internal clearance
0.002mm to 0.013mm
Materials
Ring material
Stainless Steel
Ball material
Stainless 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:
$ 1.59
/ each
In Stock
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SMF74zz Bearing Product Overview & Core Advantages
The 4 mm bore miniature ball bearing is a single-row deep groove ball bearing designed for precision applications requiring compact dimensions and reliable performance. Constructed entirely from stainless steel, it offers excellent corrosion resistance. Its shielded design provides effective protection against contamination while maintaining low running torque. This bearing is engineered to support primarily radial loads and is ideal for applications demanding high rotational accuracy and long service life in constrained spaces.
SMF74zz Bearing Model Code Explained, Specifications & Naming Convention
| Feature | Designation | Technical Significance |
|---|---|---|
| Seal Type | Shielded | Non-contact metal shields protect the bearing interior from dust and debris while minimizing friction. |
| Tolerance Class | ABEC1 | Defines standard precision levels for dimensional accuracy and running performance. |
| Internal Clearance | MC3 | Specifies a greater than normal radial internal clearance (0.002mm to 0.013mm), suitable for applications with significant thermal expansion. |
SMF74zz Bearing Structural Features & Performance Benefits
- Full Stainless Steel Construction: The bearing rings, balls, and cage are manufactured from stainless steel, providing superior corrosion resistance and making it suitable for harsh environments and washdown applications.
- Deep Groove Raceway: The geometry of the deep groove raceway enables the bearing to handle not only radial loads but also moderate axial loads in both directions.
- Optimized Miniature Design: With an ultra-compact 4x7x2.5 mm footprint and a lightweight of just 0.4 g, it is engineered for space-constrained miniature applications.
- Integrated Flange: The outer ring flange (8.2 mm diameter) facilitates secure and simplified mounting, ensuring precise axial location within a housing.
- High-Speed Capability: The combination of a stainless steel cage, precision-ground components, and MC3 clearance allows for a limiting speed of 54,000 rpm.
SMF74zz Bearing Typical Application Areas
This miniature flanged bearing is ideally suited for:
- Small Precision Motors: Used in stepper motors, coreless motors, and miniature DC motors.
- Medical and Dental Devices: Ideal for surgical handpieces, dental drills, and pump systems requiring corrosion resistance.
- Office Automation Equipment: Critical component in scanners, printers, and copiers.
- Instrumentation and Control Systems: Used in encoders, sensors, and precision guidance systems.
- Radio-Controlled Models and Drones: Provides reliable performance in motor and gearbox assemblies.
