F691
F Series Flanged Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
F691
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.14 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
Outer Ring Dimensions
Flange outer diameter
5 mm
Flange thickness
0.5 mm
Ball & Washer Dimensions
Ball diameter
0.8 mm
Ball quantity
5
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
27 lbf
Radial static load rating
7 lbf
Limiting speed
100 X 1000 rpm
Lubrication
Required
Radial internal clearance
0.002mm to 0.013mm
Radial internal clearance
MC3
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Stainless Steel
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 18.13
/ each
In Stock
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Product Overview and Core Advantages
The F691 metric ball bearing is a single row radial ball bearing designed for applications requiring a compact, high-precision solution. Its defining characteristic is its extremely small size with a 1 mm bore, making it ideal for miniature and micro-mechanical systems. Manufactured from chrome steel with an ABEC1 tolerance class, it offers reliable performance and consistent operation in demanding, space-constrained environments. Its open design allows for versatile lubrication options to suit specific application needs.
F691 Bearing Model Code Explained, Specifications & Naming Convention
| Code Part | Technical Meaning |
|---|---|
| F691 | The base model number, indicating the specific bearing series and dimensions. |
| Open | Signifies the bearing has no integral seals or shields, allowing for high-speed operation and custom lubrication. |
| MC3 | Specifies the radial internal clearance group, optimized for general operating conditions. |
Structural Features and Performance Benefits
- Compact and Lightweight Design: With a 1.6 mm width and a weight of only 0.14 g, this bearing is engineered for applications where minimizing size and mass is critical.
- High-Speed Capability: The open construction and stainless steel cage contribute to a high limiting speed of 100,000 rpm, suitable for very fast-rotating spindles.
- Radial Load Capacity: As a dedicated radial ball bearing, it is designed to efficiently support radial dynamic loads up to 27 lbf and radial static loads up to 7 lbf.
- Precision Engineering: The ABEC1 tolerance class and controlled radial internal clearance ensure smooth, low-vibration, and precise rotation.
- Material Integrity: Components made from chrome steel provide excellent wear resistance and durability, while the stainless steel cage offers corrosion resistance.
F691 Bearing Typical Application Areas
This ultra-small F691 bearing is essential in a variety of high-precision and miniature devices, including:
- Small DC Motors and Stepper Motors
- Medical and Dental Hand Tools
- Optical Encoders and Precision Instruments
- Miniature Gearboxes and Robotics
- Consumer Electronics (e.g., small fans, drones)
