SF681x
SF Series Stainless Steel Flanged Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
SF681x
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.12 g
Tolerance class
ABEC1
Seal type
Open
For load direction
Radial
Main Dimensions
Bore diameter
1.5 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
4 mm
Outside diameter tolerance
-0.008mm to 0
Width
1.2 mm
Width tolerance
-0.12mm to 0
Inner Ring Dimensions
Inner ring type
Standard
Outer Ring Dimensions
Flange outer diameter
5 mm
Flange thickness
0.4 mm
Ball & Washer Dimensions
Ball diameter
0.6 mm
Ball quantity
7
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
19 lbf
Radial static load rating
5 lbf
Limiting speed
90 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
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 19.4
/ each
In Stock
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
SF681x Bearing Product Overview & Core Advantages
The SF681x is a miniature deep groove ball bearing designed for ultra-compact, high-precision applications. Engineered with a single row construction and open design, it excels in handling radial loads efficiently. Its exceptionally small dimensions—1.5 mm bore and 4 mm outside diameter—make it an ideal solution for space-constrained assemblies requiring reliable performance. Manufactured entirely from stainless steel, it offers excellent corrosion resistance, making it suitable for demanding environments.
SF681x Bearing Model Code Explained, Specifications & Naming Convention
| Code Element | Technical Significance |
|---|---|
| SF681x | Standard series designation for miniature deep groove ball bearings. |
| Open | No integral seals or shields, allowing for higher speeds and custom lubrication schemes. |
| ABEC1 | Defines the tolerance class, ensuring standard precision for smooth operation. |
| MC3 | Specifies the radial internal clearance group, optimized for general operating conditions. |
SF681x Bearing Structural Features & Performance Benefits
- High-Speed Capability: The open design, combined with a stainless steel cage and seven precision balls, enables a limiting speed of 90,000 rpm, which is critical for miniature high-speed devices.
- Robust Construction: All components—rings, balls, and cage—are made from stainless steel, providing consistent performance, corrosion resistance, and durability.
- Precision Engineering: Manufactured to ABEC1 tolerances with controlled radial internal clearance (MC3), ensuring reliable and smooth rotation in precision instruments.
- Flange Design: The integrated flange (5 mm outer diameter) simplifies mounting and positioning, enhancing assembly accuracy and stability.
- Lightweight & Compact: Weighing only 0.12 g with a 1.2 mm width, it minimizes inertia and is perfect for weight-sensitive applications.
SF681x Bearing Typical Application Areas
This miniature bearing is indispensable in sectors where small size, low weight, and reliability are paramount. Key applications include:
- Small Precision Motors: Used in miniature DC motors and stepper motors.
- Medical Devices: Ideal for surgical handpieces, dental tools, and miniature pumps.
- Optical and Instrumentation: Supports precise movements in encoders, scanners, and gauges.
- Consumer Electronics: Found in small fans, miniature drones, and precision mechanisms.
- Robotics: Used in miniature joints, sensors, and actuators.
