W 638/1
W Series Stainless Steel Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
W 638/1
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
4.0E-5 kg
Tolerance class
P0
Seal type
Open
For load direction
Radial
Main Dimensions
Bore diameter
1 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
3 mm
Outside diameter tolerance
-0.008mm to 0
Width
1.5 mm
Width tolerance
-0.04mm to 0
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
12 lbf
Radial static load rating
3 lbf
Limiting speed
150 X 1000 rpm
Lubrication
None
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 638/1 Bearing Product Overview & Core Advantages
The W 638/1 is a metric miniature deep groove ball bearing designed for precision applications requiring compact dimensions and reliable performance. As a single row bearing with an open design, it excels in handling radial loads efficiently while maintaining minimal friction. Manufactured entirely from stainless steel, it offers excellent corrosion resistance and is suitable for operation within a temperature range of -30°C to 120°C. Its ultra-small bearing size (1mm bore, 3mm OD) and lightweight construction (0.00004 kg) make it ideal for space-constrained, high-precision mechanisms.
W 638/1 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| W | Stainless Steel Deep Groove Ball Bearing Series |
| 638/1 | Bore diameter 1 mm, outside diameter 3 mm, width 1.5 mm |
| No Seal Suffix | Open construction for minimal friction and high-speed capability |
| No Lubrication Suffix | None - Requires external lubrication based on application |
W 638/1 Bearing Structural Features & Performance Benefits
- All-Stainless Steel Construction: Rings, balls, and cage made from stainless steel provide superior corrosion resistance and durability in harsh environments.
- High-Speed Capability: The open seal type and optimized internal geometry enable operation at limiting speeds up to 150,000 rpm, making it suitable for high-speed miniature applications.
- Precision Tolerance: Manufactured to P0 tolerance class with controlled radial internal clearance (CN), ensuring consistent performance and smooth operation in precision assemblies.
- Compact & Lightweight: With minimal cross-section and weight, it reduces inertia and saves space in compact designs.
W 638/1 Bearing Typical Application Areas
- Precision Instruments: Optical encoders, measuring devices, laboratory equipment
- Small Motors & Drives: Micro motors, drone rotors, miniature DC motors
- Medical Devices: Surgical tools, dental handpieces, diagnostic equipment
- Office Automation: Printers, scanners, copiers
- Electronics: Cooling fans, small pumps, robotics
