684 2rs
600 Series Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
684 2rs
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
1 g
Tolerance class
ABEC1
Seal type
Sealed
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
Ball & Washer Dimensions
Ball diameter
1.588 mm
Ball quantity
7
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
123 lbf
Radial static load rating
41 lbf
Limiting speed
53 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
Shield material
Nitrile Rubber
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 1.13
/ each
In Stock
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684 2rs Bearing Product Overview & Core Advantages
The 684 2RS is a metric miniature deep groove ball bearing designed for compact applications requiring reliable performance. Featuring a single row design and integrated rubber seals (2RS) on both sides, it offers effective protection against contaminants. This bearing is engineered to handle primarily radial loads and is characterized by its low friction and smooth operation. Its small footprint, with a 4mm bore and 9mm outside diameter, makes it ideal for space-constrained, high-precision assemblies demanding consistent performance and durability.
684 2rs Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 684 | Basic bearing series designation, indicating a metric miniature deep groove ball bearing with a 4mm bore, 9mm OD, and 4mm width. |
| 2RS | The bearing is equipped with Rubber Seals (RS) on both sides (2). This provides superior protection against dust, moisture, and other contaminants, helping to retain lubrication and extend service life. |
684 2rs Bearing Structural Features & Performance Benefits
- Robust Construction & Material Quality: Manufactured from Chrome Steel for rings and balls, and a Stainless Steel cage, this bearing ensures high strength, wear resistance, and corrosion protection, contributing to a long operational lifespan.
- Effective Sealing for Contaminant Exclusion: The Nitrile Rubber seals (2RS) are highly effective at keeping contaminants out and grease in, making the bearing suitable for environments where dirt or moisture is a concern. This design supports a maintenance-free operation for the life of the application in many cases.
- Precision & Smooth Operation: Built to ABEC1 tolerance class with a controlled MC3 radial internal clearance, it offers reliable and smooth running, which is critical for the precise operation of miniature equipment.
- Optimized Load Capacity: With a dynamic load rating of 123 lbf and a static load rating of 41 lbf, it is well-suited to handle the significant radial loads common in compact mechanisms.
684 2rs Bearing Typical Application Areas
- Small Electric Motors: Ideal for use in miniature DC motors, stepper motors, and fan motors.
- Precision Instruments & Gauges: Used in optical encoders, medical devices, and laboratory equipment where smooth, precise rotation is paramount.
- Office Automation Equipment: Commonly found in printers, scanners, and copiers.
- Radio-Control Models & Drones: Suitable for gearboxes, wheels, and rotor assemblies in hobbyist and professional models.
- Small Power Tools & Appliances: Applicable in compact drills, grinders, and various handheld devices.
