W 637/8-2Z
W Series Stainless Steel Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
W 637/8-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.001 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
12 mm
Outside diameter tolerance
-0.008mm to 0
Width
3.5 mm
Width tolerance
-0.12mm to 0
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
70 lbf
Radial static load rating
31 lbf
Limiting speed
53 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
Price:
$ 1.28
/ each
In Stock
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W 637/8-2Z Bearing Product Overview & Core Advantages
The W 637/8-2Z is a metric single row deep groove ball bearing engineered for precision and reliability in compact applications. Constructed entirely from stainless steel, it offers excellent corrosion resistance. Its key advantage lies in its ability to handle radial loads efficiently while also accommodating moderate axial loads in both directions. The inclusion of shielded seals (2Z) and factory-applied grease lubrication ensures long-term, maintenance-free operation, making it an ideal choice for applications demanding high reliability and a compact design.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| W 637/8 | Basic bearing designation, indicating a deep groove ball bearing series with an 8 mm bore diameter. |
| -2Z | 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 637/8-2Z Bearing Structural Features & Performance Benefits
- Compact & Lightweight Design: With a width of just 3.5 mm and a weight of only 0.001 kg, this bearing is specifically designed for applications with severe space constraints.
- Corrosion Resistance: The use of stainless steel for all critical components (rings, balls, cage) ensures reliable performance in humid or corrosive environments.
- Maintenance-Free Operation: The combination of shielded seals (2Z) and pre-applied grease lubrication seals in the lubricant and protects against contaminants, enabling long service life without re-lubrication.
- Precision Performance: Manufactured to P0 tolerance class and standard CN radial internal clearance, this bearing provides consistent and precise running characteristics suitable for a wide range of industrial applications.
W 637/8-2Z Bearing Typical Application Areas
This miniature deep groove ball bearing is ideally suited for:
- Small precision instruments and medical devices
- Miniature motors and gearboxes
- Office automation equipment (e.g., printers, scanners)
- Radio-controlled models and drones
- Various low-torque, high-speed mechanisms requiring a compact bearing size.
