S691
600 Series Stainless Steel Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
S691
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.11 g
Tolerance class
ABEC1
Seal type
Open
For load direction
Radial
Main Dimensions
Bore diameter
1 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
4 mm
Outside diameter tolerance
-0.008mm to 0
Width
1.6 mm
Width tolerance
-0.12mm to 0
Inner Ring Dimensions
Inner ring type
Standard
Ball & Washer Dimensions
Ball diameter
0.8 mm
Ball quantity
5
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
24 lbf
Radial static load rating
6 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:
$ 17.64
/ each
In Stock
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S691 Bearing Product Overview & Core Advantages
The S691 is a miniature metric ball bearing engineered for applications demanding compact size and reliable performance. As a single row deep groove ball bearing, it is designed primarily to support radial loads efficiently. Constructed entirely from stainless steel, it offers excellent corrosion resistance. Its ABEC 1 precision class and compact dimensions (1mm bore, 4mm OD) make it an ideal component for high-precision, space-constrained mechanisms requiring smooth operation.
Model Code & Specification Breakdown
| Parameter | Specification / Code | Technical Significance |
|---|---|---|
| Bearing Type | S691 | Denotes a specific series of miniature deep groove ball bearings. |
| Seal Type | Open | No integral seals; allows for higher limiting speeds but requires a clean environment or external sealing. |
| Tolerance Class | ABEC 1 | Defines standard precision levels for dimensional accuracy and running smoothness. |
| Internal Clearance | MC3 | Specifies a radial internal clearance group (0.002mm to 0.013mm), suitable for general applications. |
S691 Bearing Structural Features & Performance Benefits
- Compact & Lightweight Design: With a bearing width of just 1.6mm and a weight of 0.11g, it is perfect for miniaturized devices and applications where space and weight are critical constraints.
- Full Stainless Steel Construction: The rings, balls, and cage are all made from stainless steel, providing superior corrosion resistance and durability, making it suitable for harsh environments and ensuring long service life.
- Optimized Load Capacity: Despite its small size, it offers a dynamic load rating of 24 lbf and a static load rating of 6 lbf, providing reliable performance under radial loads.
- High-Speed Capability: The open design and precision construction contribute to a limiting speed of 90,000 rpm, enabling use in high-speed miniature spindles and rotors.
- Standard Internal Clearance (MC3): This clearance group offers a balance for a wide range of operating conditions, accommodating thermal expansion and ensuring smooth, low-friction rotation.
S691 Bearing Typical Application Areas
This miniature ball bearing is extensively used in:
- Precision Instruments: Optical encoders, gauges, and small measuring devices.
- Small DC Motors & Gearboxes: Providing smooth, low-friction support for motor shafts in drones, medical devices, and miniature robotics.
- Office Automation Equipment: Printers, scanners, and copiers.
- Radio Control Models: Servos and high-speed rotors.
- Medical and Dental Handpieces: Where small size, reliability, and corrosion resistance are paramount.
