D/W R4A-2Z
D/W Series Stainless Steel Miniature Bearings
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Part No.
Part No.
D/W R4A-2Z
Basic Information
Bearing type
Ball
System of measurement
Inch
Construction
Single Row
Weight
0.0091 kg
Tolerance class
P0
Seal type
Shielded
For load direction
Radial
Main Dimensions
Bore diameter
0.25"
Bore diameter tolerance
-0.00019" to 0.00019"
Outside diameter
0.75"
Outside diameter tolerance
-0.0007" to -0.00031"
Width
0.28118"
Width tolerance
-0.005" to 0"
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
344 lbf
Radial static load rating
132 lbf
Limiting speed
40 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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D/W R4A-2Z Bearing Product Overview & Core Advantages
The D/W R4A-2Z is a single row deep groove ball bearing engineered for precision and reliability in demanding applications. 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 design (2Z) retains factory-applied grease and protects against contamination. This combination makes it a compact, durable, and low-maintenance solution for applications requiring smooth operation and long service life.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| D/W | Manufacturer's series designation. |
| R4A | Specific bearing size code, defining the core dimensions: 0.25" bore, 0.75" outside diameter, 0.28118" width. |
| 2Z | Bearing is equipped with non-contact shields on both sides. This provides effective protection against contaminants while minimizing friction, contributing to the high limiting speed. |
D/W R4A-2Z Bearing Structural Features & Performance Benefits
- Robust Stainless Steel Construction: All components, including rings, balls, and cage, are made from stainless steel, ensuring high corrosion resistance and suitability for harsh environments.
- Optimized for Radial Loads: The deep groove raceway and single-row design are engineered to provide high radial dynamic and static load ratings (344 lbf and 132 lbf respectively) for its compact size.
- High-Speed Capability: The non-contact 2Z shields and optimized internal geometry allow for a limiting speed of 40,000 rpm, making it a capable high-speed bearing.
- Pre-Greased and Sealed for Longevity: Factory-applied grease and the shielded design create a maintenance-free system, retaining lubrication and excluding pollutants over a wide temperature range (-30° to 120 °C).
- Standard Precision: Manufactured to P0 tolerance class and standard CN radial internal clearance, ensuring consistent and reliable performance for general industrial applications.
D/W R4A-2Z Bearing Typical Application Areas
This versatile miniature bearing is ideal for a wide range of applications, including:
- Precision Instruments and Optical Devices
- Small Electric Motors and Spindles
- Medical and Dental Equipment
- Food Processing Machinery
- Office Automation Equipment
- Low-Torque, High-Speed Drives
