SF684
SF Series Stainless Steel Flanged Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
SF684
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.74 g
Tolerance class
ABEC1
Seal type
Open
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
2.5 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
0.6 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
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 Bearing Product Overview & Core Advantages
The SF684 is a miniature metric ball bearing designed for applications requiring compact dimensions and reliable performance. As a single row radial ball bearing with an open design, it excels in handling radial loads efficiently. Manufactured entirely from stainless steel, it offers excellent corrosion resistance. Its extremely small size, with a 4 mm bore and 2.5 mm width, makes it ideal for space-constrained, high-precision mechanisms. The bearing is supplied without lubrication, providing flexibility for specialized application requirements.
SF684 Bearing Model Code Explained, Specifications & Naming Convention
| Code Element | Technical Significance |
|---|---|
| SF684 | The base model number, defining the core bearing dimensions (4mm bore, 9mm OD, 2.5mm width). |
| Open (Seal Type) | No seals or shields, allowing for higher limiting speed and easy re-lubrication. Suitable for clean environments. |
| Flange | An integral flange (10.3mm OD) simplifies mounting and provides secure axial location in the housing. |
SF684 Bearing Structural Features & Performance Benefits
- Compact & Lightweight Design: With a width of just 2.5 mm and a weight of 0.74 g, this bearing is engineered for miniature assemblies where space and weight are critical factors.
- Stainless Steel Construction: All components, including rings, balls, and cage, are made from stainless steel, ensuring high corrosion resistance and suitability for harsh environments.
- High-Speed Capability: The open design and ABEC1 precision class contribute to a high limiting speed of 47,700 rpm, making it suitable for fast-rotating spindles.
- Radial Load Capacity: Optimized with 7 balls of 1.588 mm diameter, it provides a dynamic load rating of 110 lbf and a static load rating of 37 lbf for its size.
- Precision & Clearance: Built to ABEC1 tolerance standards with an MC3 radial internal clearance (0.002mm to 0.013mm), ensuring smooth and consistent operation.
SF684 Bearing Typical Application Areas
- Precision Instruments: Optical encoders, small gauges, and laboratory equipment.
- Small Motors & Drives: Stepper motors, coreless motors, and miniature DC motors.
- Office Automation: Printers, scanners, and copiers.
- Medical Devices: Dental handpieces, small pumps, and diagnostic equipment.
- Robotics: Miniature joints, actuators, and drone gimbals.
