691
600 Series Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
691
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
27 lbf
Radial static load rating
7 lbf
Limiting speed
100 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:
$ 14.7
/ each
In Stock
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691 Bearing Product Overview & Core Advantages
The 691 metric ball bearing is a single row deep groove ball bearing engineered for high-speed operation and reliable performance in compact spaces. This open-type bearing is designed primarily to carry radial loads and is characterized by its extremely small dimensions (1mm bore, 4mm OD) and low mass (0.11g). Manufactured with chrome steel rings and balls and a stainless steel cage, it offers a robust solution for applications demanding precision and durability within its specified load and temperature ranges.
Model Code & Specifications Breakdown
| Parameter | Specification / Code Meaning |
|---|---|
| Prefix "691" | Denotes a metric, single row deep groove ball bearing with a specific dimension series. |
| Seal Type: Open | No integral seals or shields, allowing for higher limiting speeds and requiring an external sealing solution. |
| Bore Diameter | 1 mm |
| Outside Diameter | 4 mm |
| Width | 1.6 mm |
| Tolerance Class | ABEC1 (Standard precision grade) |
| Radial Internal Clearance | MC3 group (0.002mm to 0.013mm) |
691 Bearing Structural Features & Performance Benefits
- Deep Groove Raceway & High-Speed Capability: The deep groove geometry on both inner and outer rings enables smooth operation and is suitable for high rotational speeds up to 100,000 rpm. The stainless steel cage ensures stability and reduced friction at these high velocities.
- Radial Load Capacity: As a single row ball bearing, it is optimized to support significant radial loads (27 lbf dynamic, 7 lbf static) within its compact bearing dimensions.
- Precision & Material Integrity: Constructed from chrome steel for rings and balls, this bearing provides high hardness, wear resistance, and dimensional stability. The ABEC1 precision class ensures consistent performance for general precision applications.
- Application Flexibility: The open design allows for customization of lubrication to suit specific operational needs, though it necessitates an external sealing arrangement in contaminated environments.
691 Bearing Typical Application Areas
This miniature 691 ball bearing is ideal for applications where space is at a premium and high-speed rotation is required.
- Small Precision Motors (e.g., in drones, miniature fans)
- Medical and Dental Handpieces
- Optical Encoders and Precision Instruments
- Small Gearboxes and Mechanisms
- Office Automation Equipment (e.g., printers, scanners)
