W 630/2.5-2Z
W Series Stainless Steel Miniature Bearings
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Part No.
Part No.
W 630/2.5-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.000921 kg
Tolerance class
P0
Seal type
Shielded
For load direction
Radial
Main Dimensions
Bore diameter
2.5 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
8 mm
Outside diameter tolerance
-0.008mm to 0
Width
4 mm
Width tolerance
-0.04mm to 0
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
70 lbf
Radial static load rating
20 lbf
Limiting speed
80 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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Product Overview and Core Advantages
The W 630/2.5-2Z is a precision miniature ball bearing designed for demanding applications requiring compact dimensions and reliable performance. As a single row deep groove ball bearing, it excels at handling primarily radial loads while also accommodating moderate axial loads in both directions. Manufactured entirely from stainless steel, it offers excellent corrosion resistance. Its shielded design (2Z) and factory-applied grease lubrication provide long-term, maintenance-free operation, making it ideal for high-reliability and high-speed scenarios where space is limited.
W 630/2.5-2Z Bearing Model Code Explained, Specifications & Naming Convention
The model designation "W 630/2.5-2Z" provides key technical information:
- W 630/2.5: Indicates the bearing series and size, with a 2.5 mm bore diameter.
- 2Z: Signifies that the bearing is fitted with non-contact shields on both sides. This provides effective protection against contamination while minimizing friction, contributing to the high limiting speed.
Structural Features and Performance Benefits
- Compact and Robust Design: The single-row deep groove geometry and all-stainless-steel construction (rings, balls, and cage) provide a robust and compact solution with a high strength-to-size ratio.
- Radial Load Capacity: Engineered to handle significant radial dynamic and static loads (70 lbf and 20 lbf respectively) for its miniature size.
- High-Speed Performance: The combination of low-friction stainless steel cage, optimized grease lubrication, and non-contact shields (2Z) enables a high limiting speed of 80,000 rpm.
- Maintenance-Free Operation: The sealed-for-life design with pre-applied grease and CN radial internal clearance ensures consistent performance across the specified temperature range (-30°C to 120°C) without requiring re-lubrication.
W 630/2.5-2Z Bearing Typical Application Areas
This miniature precision bearing is ideally suited for applications requiring small bearing dimensions, high speed, and corrosion resistance, including:
- Small Precision Motors and Spindles
- Medical and Dental Hand Tools
- Optical Encoders and Instrumentation
- Office Automation Equipment (e.g., small printers, scanners)
- Robotics and Miniature Actuators
