SMF84zz
SMF Series Stainless Steel Flanged Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
SMF84zz
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.64 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
8 mm
Outside diameter tolerance
-0.008mm to 0
Width
3 mm
Width tolerance
-0.12mm to 0
Inner Ring Dimensions
Inner ring type
Standard
Outer Ring Dimensions
Flange outer diameter
9.2 mm
Flange thickness
0.6 mm
Ball & Washer Dimensions
Ball diameter
1.2 mm
Ball quantity
7
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
68 lbf
Radial static load rating
23 lbf
Limiting speed
50.4 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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SMF84zz Bearing Product Overview & Core Advantages
The 684ZZ is a miniature shielded ball bearing designed for applications requiring compact dimensions and reliable performance. As a single row deep groove ball bearing, it excels at handling radial loads and is constructed entirely from stainless steel for enhanced corrosion resistance. Its key advantages include a compact design with a 4 mm bore, making it ideal for space-constrained assemblies, and integrated shields that protect against contamination. This bearing is engineered for high reliability in precision instruments and small machinery.
SMF84zz Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning | Benefit |
|---|---|---|
| 684 | Standard bearing series designation indicating the size and type (miniature, deep groove). | Defines the compact bearing dimensions (4mm bore, 8mm OD). |
| ZZ | Indicates the bearing is equipped with shields on both sides. | Provides effective protection against dust and debris, enhancing bearing life and reliability. |
SMF84zz Bearing Structural Features & Performance Benefits
- Deep Groove Raceway & Single Row Design: Optimized for handling radial loads efficiently. The geometry ensures smooth operation and low torque.
- Full Stainless Steel Construction: The rings, balls, and cage are made from stainless steel, offering excellent corrosion resistance and suitability for various environments.
- Shielded Design (ZZ): Non-contact steel shields on both sides help retain lubrication and exclude contaminants, contributing to maintenance-free operation in many applications.
- Precision Engineering: Manufactured to ABEC1 tolerance class with controlled radial internal clearance (MC3), ensuring consistent performance and smooth rotation.
- High-Speed Capability: With a limiting speed of 50,400 rpm, it is suitable for high-speed miniature spindles and motors.
SMF84zz Bearing Typical Application Areas
This miniature 684ZZ bearing is widely used in:
- Small Precision Motors (e.g., drone motors, small DC motors)
- Office Automation Equipment (e.g., printers, scanners, copiers)
- Medical Devices and Instrumentation (e.g., surgical handpieces, small pumps)
- Radio Control Models and Hobbyist Applications
- Precision Mechanical Assemblies requiring compact, reliable rotary support
