SF688
SF Series Stainless Steel Flanged Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
SF688
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
3.53 g
Tolerance class
ABEC1
Seal type
Open
For load direction
Radial
Main Dimensions
Bore diameter
8 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
16 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
18 mm
Flange thickness
1 mm
Ball & Washer Dimensions
Ball diameter
2 mm
Ball quantity
10
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
216 lbf
Radial static load rating
96 lbf
Limiting speed
32.4 X 1000 rpm
Lubrication
Required
Radial internal clearance
0.002mm to 0.013mm
Radial internal clearance
MC3
Materials
Ring material
Stainless Steel
Ball material
Stainless Steel
Cage material
Stainless Steel
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 1.59
/ each
In Stock
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SF688 Bearing Product Overview & Core Advantages
The SF688 is a metric single row deep groove ball bearing engineered for precision and reliability in compact applications. Constructed entirely from stainless steel, it offers excellent corrosion resistance. Its primary advantage lies in its ability to efficiently support radial loads while maintaining a minimal cross-section, characterized by its 8 mm bore, 16 mm outside diameter, and a remarkably slim 4 mm width. The bearing is supplied as an open type, requiring lubrication, and adheres to ABEC1 precision class, making it a cost-effective solution for applications demanding high rotational accuracy and durability.
SF688 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| SF688 | The base model number, defining the bearing dimensions (8x16x4 mm). |
| (No Suffix) | Indicates the bearing is of open construction with no seals or shields, requiring external lubrication. |
| - | The standard radial internal clearance is C0 (MC3 group: 0.002mm to 0.013mm). |
SF688 Bearing Structural Features & Performance Benefits
- Compact & Lightweight Design: With a width of just 4 mm and a weight of 3.53 g, this single row bearing is ideal for space-constrained and weight-sensitive applications.
- High-Speed Capability: The stainless steel cage and optimized internal geometry contribute to a high limiting speed of 32,400 rpm, supporting smooth operation at high velocities.
- Robust Load Capacity: Despite its small size, it features a dynamic load rating of 216 lbf and a static load rating of 96 lbf, providing reliable performance under significant radial loads.
- Corrosion Resistance: Manufactured from stainless steel for rings, balls, and cage, the bearing is suitable for environments where corrosion is a concern, operating within a temperature range of -30°C to 110°C.
- Precision Engineering: Built to ABEC1 tolerance class, it ensures consistent running accuracy and low vibration, which is critical for precision mechanisms.
SF688 Bearing Typical Application Areas
This SF688 bearing is commonly specified in:
- Small Precision Motors (e.g., stepper motors, DC micromotors)
- Medical and Dental Handpieces
- Office Automation Equipment (e.g., scanners, printers, small fans)
- Instrumentation and Control Devices
- Radio Control Models and Drones
- Low-Torque, High-Speed Spindles
