W 638/3-2RS1
W Series Stainless Steel Miniature Bearings
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Part No.
Part No.
W 638/3-2RS1
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.00041 kg
Tolerance class
P0
Seal type
Sealed
For load direction
Radial
Main Dimensions
Bore diameter
3 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
7 mm
Outside diameter tolerance
-0.008mm to 0
Width
3 mm
Width tolerance
-0.12mm to 0
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
40 lbf
Radial static load rating
13 lbf
Limiting speed
45 X 1000 rpm
Lubrication
Grease
Radial internal clearance
CN
Materials
Ring material
Stainless Steel
Ball material
Stainless Steel
Cage material
Stainless Steel
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
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In Stock
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W 638/3-2RS1 Bearing Product Overview & Core Advantages
The W 638/3-2RS1 is a miniature sealed deep groove ball bearing designed for applications requiring compact dimensions and reliable performance. Constructed entirely from stainless steel, it offers excellent corrosion resistance. Its key advantages include the ability to handle primarily radial loads, integrated contact seals (2RS1) for contamination protection, and pre-lubrication for maintenance-free operation. This makes it an ideal solution for high-precision, space-constrained mechanisms demanding long-term reliability.
Model Code Breakdown
The model designation W 638/3-2RS1 provides detailed technical specifications:
- W 638/3: Indicates the bearing series and size. The bore diameter is 3 mm.
- 2RS1: Denotes the sealing type. "2" means two seals, one on each side. "RS1" specifies NBR contact seals with steel reinforcements, providing effective protection against dust and moisture.
W 638/3-2RS1 Bearing Structural Features & Performance Benefits
- Compact and Robust Design: The single row deep groove raceway and all-stainless-steel construction (rings, balls, and cage) provide a robust yet lightweight solution, weighing only 0.00041 kg.
- Effective Sealing and Lubrication: The 2RS1 contact seals retain grease and effectively shield the internal components from contaminants. The bearing is pre-lubricated with grease, enabling maintenance-free operation within a temperature range of -30°C to 120°C.
- Precision and Speed: Manufactured to P0 tolerance class with a CN radial internal clearance, it ensures smooth and consistent operation. The limiting speed of 45,000 rpm makes it suitable for high-speed applications.
- Load Capacity: With a dynamic load rating of 40 lbf and a static load rating of 13 lbf, it is engineered to handle the demands of small, precision drives.
W 638/3-2RS1 Bearing Typical Application Areas
This bearing is ideally suited for:
- Small Precision Motors and Drives
- Medical and Dental Handpieces
- Optical and Instrumentation Devices
- Office Automation Equipment (e.g., printers, scanners)
- RC Models and Miniature Robotics
