SF688 2rs
SF Series Stainless Steel Flanged Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
SF688 2rs
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
4.51 g
Tolerance class
ABEC1
Seal type
Sealed
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
5 mm
Width tolerance
-0.12mm to 0
Inner Ring Dimensions
Inner ring type
Standard
Outer Ring Dimensions
Flange outer diameter
18 mm
Flange thickness
1.1 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
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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SF688 2rs Bearing Product Overview & Core Advantages
The SF688-2RS is a metric miniature ball bearing engineered for precision applications requiring compact dimensions and reliable performance. This single row deep groove ball bearing features integral contact seals (2RS) for effective contamination protection. Constructed entirely from stainless steel (rings, balls, and cage), it offers excellent corrosion resistance. Its core advantages include the ability to handle radial loads efficiently, compact bearing dimensions (8mm bore, 16mm OD, 5mm width), and suitability for applications demanding ABEC1 precision and moderate speeds.
SF688 2rs Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| SF688 | The base bearing designation, indicating a specific series of miniature deep groove ball bearings with standard dimensions. |
| 2RS | Signifies that the bearing is equipped with two (2) Nitrile Rubber (NBR) Contact Seals (RS) on both sides. These seals provide superior protection against dust and moisture compared to non-contact shields, making the bearing pre-lubricated and largely maintenance-free. |
SF688 2rs Bearing Structural Features & Performance Benefits
- Robust Sealed Construction: The double-sided contact seals (2RS) effectively retain lubricant and exclude contaminants, enhancing bearing life and reliability in challenging environments. This contributes to its low-maintenance characteristic.
- Corrosion Resistance: The use of stainless steel for all critical components (rings, balls, cage) ensures high resistance to rust and corrosion, making it ideal for applications exposed to moisture or certain chemicals.
- Precision Performance: Manufactured to ABEC1 tolerance class with a controlled radial internal clearance (MC3 group), this bearing provides consistent running accuracy and smooth operation, which is critical for precision instruments.
- Optimized Load Capacity: The deep groove raceway and complement of 10 balls enable efficient handling of radial dynamic loads up to 216 lbf and radial static loads up to 96 lbf, despite its miniature size.
SF688 2rs Bearing Typical Application Areas
- Small Precision Motors: Ideal for spindle support in small DC motors, stepper motors, and servo motors.
- Medical and Dental Equipment: Used in handheld tools, pumps, and scanners where corrosion resistance, compact size, and reliability are paramount.
- Office Automation: Suitable for printers, scanners, and copiers.
- Instrumentation and Control Systems: Applied in encoders, sensors, and small gearboxes requiring precision bearings.
- Radio Control Models and Small Machinery: Provides durable performance in drones, RC cars, and other compact mechanical assemblies.
