SF684 2rs
SF Series Stainless Steel Flanged Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
SF684 2rs
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
1.15 g
Tolerance class
ABEC1
Seal type
Sealed
For load direction
Radial
Main Dimensions
Bore diameter
4 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
9 mm
Outside diameter tolerance
-0.008mm to 0
Width
4 mm
Width tolerance
-0.12mm to 0
Inner Ring Dimensions
Inner ring type
Standard
Outer Ring Dimensions
Flange outer diameter
10.3 mm
Flange thickness
1 mm
Ball & Washer Dimensions
Ball diameter
1.588 mm
Ball quantity
7
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
110 lbf
Radial static load rating
37 lbf
Limiting speed
47.7 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
Nitrile Rubber
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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SF684 2rs Bearing Product Overview & Core Advantages
The SF684 2RS is a metric miniature deep groove ball bearing engineered for precision applications requiring compact design and reliable performance. Featuring a single row construction and integral rubber seals (2RS), this bearing is optimized for radial load applications and offers protection against contamination. Manufactured entirely from stainless steel for enhanced corrosion resistance, it is an ideal solution for applications demanding high reliability in limited spaces. Its ABEC1 precision class ensures consistent operation, making it a superior choice for sensitive mechanical systems.
SF684 2rs Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| SF684 | The base bearing designation, indicating a specific series with a 4mm bore, 9mm OD, and 4mm width. |
| 2RS | Signifies that the bearing is equipped with contact rubber seals on both sides. This provides excellent protection against dust and moisture ingress, making the bearing suitable for harsh environments. |
SF684 2rs Bearing Structural Features & Performance Benefits
- Robust Sealing: The Nitrile Rubber (2RS) seals effectively shield the internal components from contaminants, significantly extending bearing service life and reducing maintenance needs.
- Corrosion Resistance: Constructed entirely from stainless steel (rings, balls, and cage), this bearing offers superior performance in corrosive or wash-down environments.
- Precision Engineering: Manufactured to ABEC1 tolerance class with a controlled radial internal clearance (MC3), ensuring smooth, low-vibration, and quiet operation.
- High-Speed Capability: With a limiting speed of 47,700 rpm, it is well-suited for high-speed miniature applications such as small motors and precision spindles.
- Compact and Lightweight: The miniature bearing dimensions (4x9x4mm) and low weight (1.15g) make it perfect for space-constrained designs without sacrificing performance.
SF684 2rs Bearing Typical Application Areas
- Small Precision Electric Motors and Fans
- Medical and Dental Handpieces
- Office Automation Equipment (e.g., printers, scanners)
- Robotics and RC Models
- Instrumentation and Measurement Devices
- Textile Machinery Guides
