SF691
SF Series Stainless Steel Flanged Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
SF691
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
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:
$ 21.76
/ each
In Stock
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SF691 Bearing Product Overview & Core Advantages
The SF691 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, making it suitable for various demanding environments. Its ABEC1 precision class ensures consistent operation, while its extremely small size and low weight (0.14 g) make it ideal for space-constrained assemblies.
SF691 Bearing Model Code Explained, Specifications & Naming Convention
| Code Element | Technical Meaning |
|---|---|
| SF691 | Basic bearing model number, defining the core dimensions: 1mm bore, 4mm OD, 1.6mm width. |
| Open | No seals or shields, allowing for higher possible speeds and easy re-lubrication, but requiring a clean operating environment. |
| MC3 | Specifies the radial internal clearance group (0.002mm to 0.013mm), which is wider than normal, suitable for applications with potential thermal expansion. |
SF691 Bearing Structural Features & Performance Benefits
- Compact & Lightweight Design: With a bore diameter of just 1mm and a total weight of 0.14g, this bearing is engineered for miniature mechanisms and instruments where space and weight are critical constraints.
- Stainless Steel Construction: All components—rings, balls, and cage—are made from stainless steel, providing superior corrosion resistance and durability in humid or chemically aggressive environments.
- Radial Load Capacity: The deep groove raceway and 5 stainless steel balls are optimized to handle the specified radial dynamic load rating of 24 lbf and radial static load rating of 6 lbf effectively.
- High-Speed Capability: The open design and precision construction contribute to a limiting speed of 90,000 rpm, making it a capable high-speed bearing for small motors and spindles.
- Standard Internal Clearance (MC3): The designated clearance helps accommodate shaft and housing fits, as well as thermal effects, ensuring stable performance across its operating temperature range of -30°C to 110°C.
SF691 Bearing Typical Application Areas
This miniature deep groove ball bearing is ideally suited for:
- Precision Instruments: Optical encoders, gauges, and medical devices.
- Small Motors: Micro-DC motors, stepper motors, and fan motors.
- Office Automation Equipment: Printers, scanners, and copiers.
- Robotics: Small joints and actuators in miniature robotic arms.
- Electronic Equipment: Small cooling fans and disk drive mechanisms.
