638/4-2Z
6000, 6200 & 6300 Series Metric Standard Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
638/4-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.00098 kg
Tolerance class
P6
Seal type
Shielded
For load direction
Radial
Main Dimensions
Bore diameter
4 mm
Bore diameter tolerance
-0.007mm to 0
Outside diameter
9 mm
Outside diameter tolerance
-0.007mm to 0
Width
4 mm
Width tolerance
-0.12mm to 0
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
95 lbf
Radial static load rating
26 lbf
Limiting speed
70 X 1000 rpm
Lubrication
Grease
Radial internal clearance
CN
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:
$ 2.92
/ each
In Stock
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638/4-2Z Bearing Product Overview & Core Advantages
The 638/4-2Z is a precision miniature ball bearing designed for compact, high-performance applications. As a single row deep groove ball bearing with shielded construction, it excels at handling radial loads efficiently. Its metric design, featuring a very small 4 mm bore, makes it ideal for applications where space is at a premium and reliable rotational performance is critical. Manufactured to a P6 tolerance class, it offers superior running accuracy and is pre-lubricated with grease for immediate, long-lasting operation.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 638 | Standard series designation for miniature deep groove ball bearings. |
| /4 | Indicates a bore diameter of 4 mm. |
| -2Z | Signifies the bearing is equipped with shielded seals on both sides. This provides effective protection against contamination while allowing for high-speed operation. |
638/4-2Z Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: Built to P6 tolerance class with tight dimensional tolerances, this bearing ensures smooth, precise, and vibration-free operation, contributing to overall system accuracy.
- Optimized Load Capacity: The deep groove raceway and chrome steel construction enable it to handle significant radial dynamic loads (95 lbf) for its compact size.
- Reliable High-Speed Performance: The combination of a low-friction stainless steel cage, shielded design, and pre-applied grease enables a limiting speed of 70,000 rpm, making it a capable high-speed bearing.
- Maintenance-Free & Long Service Life: The 2Z shields retain the factory-applied grease and protect the internal components from dust and debris, resulting in a sealed-for-life, maintenance-free solution ideal for hard-to-reach applications.
638/4-2Z Bearing Typical Application Areas
This miniature bearing is engineered for a wide range of compact and precision devices, including:
- Small Precision Motors and Stepper Motors
- Medical Devices and Dental Handpieces
- Office Automation Equipment (e.g., printers, scanners)
- Instrumentation and Optical Encoders
- Small Fans, Pumps, and High-Speed Spindles
