S684
600 Series Stainless Steel Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
S684
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.65 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
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:
$ 1.35
/ each
In Stock
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S684 Bearing Product Overview & Core Advantages
The S684 is a metric miniature ball bearing designed for precision applications requiring compact dimensions and reliable performance. As a single row deep groove ball bearing with an open design, it excels in handling radial loads efficiently. Manufactured entirely from stainless steel, it offers excellent corrosion resistance. Its small bearing dimensions (4mm bore, 9mm OD, 2.5mm width) and light weight make it ideal for space-constrained, high-speed mechanisms. The bearing operates effectively within a wide temperature range and complies with RoHS and REACH standards, ensuring suitability for modern electronic and industrial applications.
S684 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S684 | The base model number indicating a specific series of miniature bearings with a 4mm bore diameter, 9mm outside diameter, and 2.5mm width. |
| Open | Specifies the bearing has no seals or shields, allowing for higher limiting speeds and easy re-lubrication, but requiring a clean operating environment. |
| ABEC1 | The tolerance class defining standard precision levels for runout and dimensional accuracy. |
| MC3 | Specifies the radial internal clearance group (C3), which is greater than normal, making it suitable for applications with thermal expansion or where interference fits are used. |
S684 Bearing Structural Features & Performance Benefits
- Compact & Lightweight Design: With a width of just 2.5mm and a weight of 0.65g, this bearing is engineered for applications where minimizing size and mass is critical.
- High-Speed Capability: The open structure, combined with a stainless steel cage and 7 precision balls, enables a high limiting speed of 47,700 rpm, making it a capable high-speed bearing.
- Corrosion Resistance: Constructed entirely from stainless steel (rings, balls, and cage), the S684 provides excellent resistance to rust and corrosion, enhancing longevity in harsh or wash-down environments.
- Radial Load Capacity: The deep groove raceway and stainless steel construction provide a radial dynamic load rating of 110 lbf and a radial static load rating of 37 lbf for its size class.
- Standard Internal Clearance (C3): The MC3 radial internal clearance (0.002mm to 0.013mm) accommodates thermal expansion and interference fits, preventing premature failure due to preload in specific applications.
S684 Bearing Typical Application Areas
- Precision Small Motors: Ideal for spindle support in miniature DC motors, stepper motors, and coreless motors.
- Medical and Dental Devices: Used in surgical handpieces, dental drills, and small pump mechanisms due to its corrosion resistance and compact size.
- Office Automation Equipment: Critical component in scanners, printers, and copiers for guiding rollers and paper feed mechanisms.
- Robotics and RC Models: Provides smooth, low-friction rotation in small joints, gearboxes, and drive systems for drones and hobbyist models.
- Instrumentation and Gauges: Supports rotating elements in precision measuring devices and sensitive instruments.
