W 638/8-2Z
W Series Stainless Steel Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
W 638/8-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.0046 kg
Tolerance class
P0
Seal type
Shielded
For load direction
Radial
Main Dimensions
Bore diameter
8 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
16 mm
Outside diameter tolerance
-0.008mm to 0
Width
6 mm
Width tolerance
-0.12mm to 0
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
161 lbf
Radial static load rating
67 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
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
Our sales team will respond within 24 hours with a competitive quote tailored to your requirements.
REQUEST A QUOTE
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
W 638/8-2Z Bearing Product Overview & Core Advantages
The W 638/8-2Z is a metric single row deep groove ball bearing engineered for precision applications requiring high reliability. Constructed entirely from stainless steel, it offers excellent corrosion resistance. Its key advantage lies in its ability to efficiently handle radial loads while its shielded (2Z) design retains factory-applied grease, providing long-term, maintenance-free operation. This makes it an ideal compact bearing solution for applications demanding cleanliness and durability within its specified load and speed parameters.
W 638/8-2Z Bearing Model Code Explained, Specifications & Naming Convention
The model number W 638/8-2Z can be broken down as follows:
- W 638: Basic series designation for a stainless steel deep groove ball bearing.
- /8: Indicates a bore diameter of 8 mm.
- -2Z: Signifies that the bearing is equipped with non-contact shields on both sides. This provides effective protection against contamination while minimizing friction, contributing to the high limiting speed.
W 638/8-2Z Bearing Structural Features & Performance Benefits
- Robust Construction: Manufactured from stainless steel for the rings, balls, and cage, ensuring consistent performance and resistance to corrosion in demanding environments.
- Optimized Load Handling: The single row deep groove raceway geometry is designed to support significant radial dynamic load ratings (161 lbf), making it a reliable choice for various mechanical systems.
- High-Speed Capability: The combination of low-friction shields (2Z) and a stainless steel cage allows for a high limiting speed of 45,000 rpm, suitable for fast-rotating applications.
- Maintenance-Free Operation: The bearing is pre-lubricated with grease and sealed with shields, making it a lubricated-for-life component under normal operating conditions within its specified temperature range of -30°C to 120°C.
- Precision Fit: Manufactured to P0 tolerance class and standard CN radial internal clearance, ensuring predictable performance and ease of installation in precision assemblies.
W 638/8-2Z Bearing Typical Application Areas
This bearing is well-suited for a wide range of applications where compact size, corrosion resistance, and high-speed operation are critical. Key sectors include:
- Precision Instruments and medical devices
- Small electric motors and gearboxes
- Office automation equipment (e.g., printers, scanners)
- Food processing and packaging machinery
- Robotics and small drive systems
