SF684zz
SF Series Stainless Steel Flanged Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
SF684zz
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
1.15 g
Tolerance class
ABEC1
Seal type
Shielded
For load direction
Radial
Main Dimensions
Bore diameter
4 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
9 mm
Outside diameter tolerance
-0.008mm to 0
Width
4 mm
Width tolerance
-0.12mm to 0
Inner Ring Dimensions
Inner ring type
Standard
Outer Ring Dimensions
Flange outer diameter
10.3 mm
Flange thickness
1 mm
Ball & Washer Dimensions
Ball diameter
1.588 mm
Ball quantity
7
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
110 lbf
Radial static load rating
37 lbf
Limiting speed
47.7 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
Shield material
300 Series Stainless Steel
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 1.59
/ each
In Stock
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Product Overview and Core Advantages
The 684zz is a miniature shielded ball bearing designed for precision applications requiring compact dimensions and reliable performance. Constructed entirely from stainless steel, it offers excellent corrosion resistance. This single row bearing is optimized for radial loads and operates effectively across a wide temperature range. Its key advantages include a compact flange for secure mounting, a high limiting speed of 47,700 rpm, and compliance with RoHS and REACH standards, making it a versatile and durable choice for demanding miniature assemblies.
SF684zz Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 684 | The basic bearing designation, indicating the specific size series with a 4mm bore, 9mm OD, and 4mm width. |
| zz | Signifies that the bearing is equipped with non-contact steel shields (Z-shields) on both sides. This provides effective protection against contamination while minimizing friction, contributing to the high-speed capability. |
Structural Features and Performance Benefits
- Compact Flange Design: The integrated flange (10.3mm outer diameter) facilitates easy and secure axial location and mounting, simplifying assembly in compact spaces.
- Corrosion Resistance: Manufactured from 300 series stainless steel for the rings, balls, cage, and shields, this bearing is suitable for applications exposed to moisture or corrosive environments.
- High-Speed Performance: The combination of a stainless steel cage, seven precision balls, and non-contact ZZ shields allows for a very high limiting speed, making it ideal for high-RPM applications.
- Precision and Consistency: Built to ABEC1 tolerance class with a controlled MC3 radial internal clearance (0.002mm to 0.013mm), ensuring smooth and reliable operation.
- Broad Temperature Range: Operates effectively from -30°C to 110°C, accommodating a wide range of operating conditions.
SF684zz Bearing Typical Application Areas
This bearing is ideally suited for a variety of small, high-speed, and precision mechanisms, including:
- Small DC Motors and Stepper Motors
- Precision Instrumentation and Gauges
- Office Automation Equipment (Printers, Scanners)
- Medical Devices and Dental Handpieces
- Radio-Controlled Models and Drones
- Computer Cooling Fans
