691x
600 Series Miniature Bearings
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Part No.
Part No.
691x
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.2 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
5 mm
Outside diameter tolerance
-0.008mm to 0
Width
2 mm
Width tolerance
-0.12mm to 0
Inner Ring Dimensions
Inner ring type
Standard
Ball & Washer Dimensions
Ball diameter
1 mm
Ball quantity
6
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
32 lbf
Radial static load rating
9 lbf
Limiting speed
85 X 1000 rpm
Lubrication
Required
Radial internal clearance
MC3
Radial internal clearance
0.002mm to 0.013mm
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:
$ 12.25
/ each
In Stock
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691x Bearing Product Overview & Core Advantages
The 691x metric series represents a compact, high-precision single row deep groove ball bearing engineered for applications demanding minimal space and reliable performance. This bearing is specifically designed to handle radial loads primarily, making it an ideal solution for small-scale, high-speed mechanisms. Manufactured with chrome steel rings and balls, it offers excellent durability and consistent operation. Its compact dimensions of 1.5 mm bore and 5 mm outside diameter, combined with a ABEC1 tolerance class, ensure precise rotational accuracy and high reliability in demanding miniature applications.
691x Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 69 | Series designation for extra-small, thin-section deep groove ball bearings. |
| 1x | Specific size code within the 69 series, defining the 1.5x5x2 mm (Bore x OD x Width) dimensions. |
| Open (Seal Type) | No integral seals or shields, allowing for higher limiting speeds and requiring external lubrication and protection from contaminants. |
| MC3 (Clearance) | Specifies a greater than normal radial internal clearance (0.002mm to 0.013mm), suitable for applications with thermal expansion or where a looser fit is required. |
691x Bearing Structural Features & Performance Benefits
- Compact & Lightweight Design: With a minimal cross-section and a weight of only 0.2 grams, this bearing is perfect for applications where space and weight are critical constraints, such as in miniature drones and precision instruments.
- High-Speed Capability: The stainless steel cage and optimized deep groove raceway contribute to a high limiting speed of 85,000 rpm, enabling smooth operation in fast-rotating assemblies.
- Radial Load Capacity: The single-row deep groove construction is optimally designed to support radial dynamic loads up to 32 lbf, providing reliable performance in compact assemblies.
- Precision Engineering: Manufactured to ABEC1 precision class standards, this bearing ensures consistent running accuracy and low vibration, which is crucial for sensitive electronic and mechanical systems.
- Material Integrity: Components made from chrome steel offer high hardness and wear resistance, while the stainless steel cage provides excellent corrosion resistance and cage stability.
691x Bearing Typical Application Areas
- Small Precision Motors: Ideal for spindle support in miniature DC motors and stepper motors used in robotics, medical devices, and optical drives.
- Instrumentation and Gauges: Used in precision measuring instruments and sensitive gauge movements where smooth, low-friction rotation is essential.
- Office Automation Equipment: Critical components in printers, scanners, and small copiers for supporting various rollers and shafts.
- Consumer Electronics: Found in small cooling fans, miniature drones (UAVs), and handheld electronic devices requiring reliable, high-speed miniature bearings.
- Model Making & Hobbyist Projects: Suitable for high-performance RC cars, drones, and other model applications demanding small bearing dimensions and high rotational speeds.
