638 2rs
600 Series Miniature Bearings
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Part No.
Part No.
638 2rs
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
30.3 g
Tolerance class
ABEC1
Seal type
Sealed
For load direction
Radial
Main Dimensions
Bore diameter
8 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
28 mm
Outside diameter tolerance
-0.008mm to 0
Width
9 mm
Width tolerance
-0.12mm to 0
Inner Ring Dimensions
Inner ring type
Standard
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
7
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
873 lbf
Radial static load rating
357 lbf
Limiting speed
28 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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638 2rs Bearing Product Overview & Core Advantages
The 638 2RS is a single row deep groove ball bearing designed for reliable performance in demanding applications. This metric bearing features integral rubber seals (2RS) on both sides, providing excellent protection against contamination and retaining lubricant. Its compact design, with an 8 mm bore and 28 mm outside diameter, offers a high load capacity relative to its size. Engineered for primarily radial loads, it is a versatile and cost-effective solution for a wide range of industrial machinery, ensuring long service life and consistent operation.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 638 | Basic bearing series, defining the standard dimensions (8x28x9 mm). |
| 2RS | Contact Nitrile Rubber Seals on both sides. Provides superior sealing effectiveness compared to non-contact shields. |
638 2rs Bearing Structural Features & Performance Benefits
- Robust Sealing: The double-sided 2RS seals effectively exclude contaminants like dust and moisture, while retaining the factory-fitted lubricant. This significantly extends bearing life and enables operation in less-than-ideal environments.
- Optimized Internal Geometry: The deep groove raceway and 7 high-grade chrome steel balls are precision-engineered to handle significant radial dynamic loads (873 lbf) and moderate axial loads in both directions.
- High-Speed Capability: The stainless steel cage ensures stable ball guidance and low friction, contributing to a high limiting speed of 28,000 rpm.
- Precision & Reliability: Manufactured to ABEC1 tolerance class with a controlled radial internal clearance (C3), this bearing delivers consistent performance, low noise, and low vibration.
638 2rs Bearing Typical Application Areas
- Small Electric Motors
- Power Tools
- Pumps and Gearboxes
- Conveyor Systems
- Agricultural Machinery
- Automotive Components (e.g., alternators, starters)
- Office Automation Equipment
